diff --git a/dist/vue.common.dev.js b/dist/vue.common.dev.js
index 619ed40d9fe..36780a616ed 100644
--- a/dist/vue.common.dev.js
+++ b/dist/vue.common.dev.js
@@ -1,5 +1,5 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
@@ -534,6 +534,7 @@ var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android'
 var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
 var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 var isPhantomJS = UA && /phantomjs/.test(UA);
+var isFF = UA && UA.match(/firefox\/(\d+)/);
 
 // Firefox has a "watch" function on Object.prototype...
 var nativeWatch = ({}).watch;
@@ -2404,2437 +2405,2439 @@ function normalizeArrayChildren (children, nestedIndex) {
 
 /*  */
 
-function ensureCtor (comp, base) {
-  if (
-    comp.__esModule ||
-    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-  ) {
-    comp = comp.default;
+function initProvide (vm) {
+  var provide = vm.$options.provide;
+  if (provide) {
+    vm._provided = typeof provide === 'function'
+      ? provide.call(vm)
+      : provide;
   }
-  return isObject(comp)
-    ? base.extend(comp)
-    : comp
-}
-
-function createAsyncPlaceholder (
-  factory,
-  data,
-  context,
-  children,
-  tag
-) {
-  var node = createEmptyVNode();
-  node.asyncFactory = factory;
-  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-  return node
 }
 
-function resolveAsyncComponent (
-  factory,
-  baseCtor,
-  context
-) {
-  if (isTrue(factory.error) && isDef(factory.errorComp)) {
-    return factory.errorComp
-  }
-
-  if (isDef(factory.resolved)) {
-    return factory.resolved
-  }
-
-  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-    return factory.loadingComp
-  }
-
-  if (isDef(factory.contexts)) {
-    // already pending
-    factory.contexts.push(context);
-  } else {
-    var contexts = factory.contexts = [context];
-    var sync = true;
-
-    var forceRender = function (renderCompleted) {
-      for (var i = 0, l = contexts.length; i < l; i++) {
-        contexts[i].$forceUpdate();
-      }
-
-      if (renderCompleted) {
-        contexts.length = 0;
-      }
-    };
-
-    var resolve = once(function (res) {
-      // cache resolved
-      factory.resolved = ensureCtor(res, baseCtor);
-      // invoke callbacks only if this is not a synchronous resolve
-      // (async resolves are shimmed as synchronous during SSR)
-      if (!sync) {
-        forceRender(true);
-      } else {
-        contexts.length = 0;
-      }
-    });
-
-    var reject = once(function (reason) {
-      warn(
-        "Failed to resolve async component: " + (String(factory)) +
-        (reason ? ("\nReason: " + reason) : '')
-      );
-      if (isDef(factory.errorComp)) {
-        factory.error = true;
-        forceRender(true);
+function initInjections (vm) {
+  var result = resolveInject(vm.$options.inject, vm);
+  if (result) {
+    toggleObserving(false);
+    Object.keys(result).forEach(function (key) {
+      /* istanbul ignore else */
+      {
+        defineReactive$$1(vm, key, result[key], function () {
+          warn(
+            "Avoid mutating an injected value directly since the changes will be " +
+            "overwritten whenever the provided component re-renders. " +
+            "injection being mutated: \"" + key + "\"",
+            vm
+          );
+        });
       }
     });
+    toggleObserving(true);
+  }
+}
 
-    var res = factory(resolve, reject);
-
-    if (isObject(res)) {
-      if (isPromise(res)) {
-        // () => Promise
-        if (isUndef(factory.resolved)) {
-          res.then(resolve, reject);
-        }
-      } else if (isPromise(res.component)) {
-        res.component.then(resolve, reject);
-
-        if (isDef(res.error)) {
-          factory.errorComp = ensureCtor(res.error, baseCtor);
-        }
+function resolveInject (inject, vm) {
+  if (inject) {
+    // inject is :any because flow is not smart enough to figure out cached
+    var result = Object.create(null);
+    var keys = hasSymbol
+      ? Reflect.ownKeys(inject)
+      : Object.keys(inject);
 
-        if (isDef(res.loading)) {
-          factory.loadingComp = ensureCtor(res.loading, baseCtor);
-          if (res.delay === 0) {
-            factory.loading = true;
-          } else {
-            setTimeout(function () {
-              if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                factory.loading = true;
-                forceRender(false);
-              }
-            }, res.delay || 200);
-          }
+    for (var i = 0; i < keys.length; i++) {
+      var key = keys[i];
+      // #6574 in case the inject object is observed...
+      if (key === '__ob__') { continue }
+      var provideKey = inject[key].from;
+      var source = vm;
+      while (source) {
+        if (source._provided && hasOwn(source._provided, provideKey)) {
+          result[key] = source._provided[provideKey];
+          break
         }
-
-        if (isDef(res.timeout)) {
-          setTimeout(function () {
-            if (isUndef(factory.resolved)) {
-              reject(
-                "timeout (" + (res.timeout) + "ms)"
-              );
-            }
-          }, res.timeout);
+        source = source.$parent;
+      }
+      if (!source) {
+        if ('default' in inject[key]) {
+          var provideDefault = inject[key].default;
+          result[key] = typeof provideDefault === 'function'
+            ? provideDefault.call(vm)
+            : provideDefault;
+        } else {
+          warn(("Injection \"" + key + "\" not found"), vm);
         }
       }
     }
-
-    sync = false;
-    // return in case resolved synchronously
-    return factory.loading
-      ? factory.loadingComp
-      : factory.resolved
+    return result
   }
 }
 
 /*  */
 
-function isAsyncPlaceholder (node) {
-  return node.isComment && node.asyncFactory
-}
 
-/*  */
 
-function getFirstComponentChild (children) {
-  if (Array.isArray(children)) {
-    for (var i = 0; i < children.length; i++) {
-      var c = children[i];
-      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
-        return c
+/**
+ * Runtime helper for resolving raw children VNodes into a slot object.
+ */
+function resolveSlots (
+  children,
+  context
+) {
+  if (!children || !children.length) {
+    return {}
+  }
+  var slots = {};
+  for (var i = 0, l = children.length; i < l; i++) {
+    var child = children[i];
+    var data = child.data;
+    // remove slot attribute if the node is resolved as a Vue slot node
+    if (data && data.attrs && data.attrs.slot) {
+      delete data.attrs.slot;
+    }
+    // named slots should only be respected if the vnode was rendered in the
+    // same context.
+    if ((child.context === context || child.fnContext === context) &&
+      data && data.slot != null
+    ) {
+      var name = data.slot;
+      var slot = (slots[name] || (slots[name] = []));
+      if (child.tag === 'template') {
+        slot.push.apply(slot, child.children || []);
+      } else {
+        slot.push(child);
       }
+    } else {
+      (slots.default || (slots.default = [])).push(child);
+    }
+  }
+  // ignore slots that contains only whitespace
+  for (var name$1 in slots) {
+    if (slots[name$1].every(isWhitespace)) {
+      delete slots[name$1];
     }
   }
+  return slots
 }
 
-/*  */
+function isWhitespace (node) {
+  return (node.isComment && !node.asyncFactory) || node.text === ' '
+}
 
 /*  */
 
-function initEvents (vm) {
-  vm._events = Object.create(null);
-  vm._hasHookEvent = false;
-  // init parent attached events
-  var listeners = vm.$options._parentListeners;
-  if (listeners) {
-    updateComponentListeners(vm, listeners);
+function normalizeScopedSlots (
+  slots,
+  normalSlots
+) {
+  var res;
+  if (!slots) {
+    res = {};
+  } else if (slots._normalized) {
+    return slots
+  } else {
+    res = {};
+    for (var key in slots) {
+      if (slots[key] && key[0] !== '$') {
+        res[key] = normalizeScopedSlot(slots[key]);
+      }
+    }
+  }
+  // expose normal slots on scopedSlots
+  for (var key$1 in normalSlots) {
+    if (!(key$1 in res)) {
+      res[key$1] = proxyNormalSlot(normalSlots, key$1);
+    }
   }
+  def(res, '_normalized', true);
+  def(res, '$stable', slots ? !!slots.$stable : true);
+  return res
 }
 
-var target;
-
-function add (event, fn) {
-  target.$on(event, fn);
+function normalizeScopedSlot(fn) {
+  return function (scope) {
+    var res = fn(scope);
+    return res && typeof res === 'object' && !Array.isArray(res)
+      ? [res] // single vnode
+      : normalizeChildren(res)
+  }
 }
 
-function remove$1 (event, fn) {
-  target.$off(event, fn);
+function proxyNormalSlot(slots, key) {
+  return function () { return slots[key]; }
 }
 
-function createOnceHandler (event, fn) {
-  var _target = target;
-  return function onceHandler () {
-    var res = fn.apply(null, arguments);
-    if (res !== null) {
-      _target.$off(event, onceHandler);
-    }
-  }
-}
+/*  */
 
-function updateComponentListeners (
-  vm,
-  listeners,
-  oldListeners
+/**
+ * Runtime helper for rendering v-for lists.
+ */
+function renderList (
+  val,
+  render
 ) {
-  target = vm;
-  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-  target = undefined;
-}
-
-function eventsMixin (Vue) {
-  var hookRE = /^hook:/;
-  Vue.prototype.$on = function (event, fn) {
-    var vm = this;
-    if (Array.isArray(event)) {
-      for (var i = 0, l = event.length; i < l; i++) {
-        vm.$on(event[i], fn);
-      }
-    } else {
-      (vm._events[event] || (vm._events[event] = [])).push(fn);
-      // optimize hook:event cost by using a boolean flag marked at registration
-      // instead of a hash lookup
-      if (hookRE.test(event)) {
-        vm._hasHookEvent = true;
-      }
-    }
-    return vm
-  };
-
-  Vue.prototype.$once = function (event, fn) {
-    var vm = this;
-    function on () {
-      vm.$off(event, on);
-      fn.apply(vm, arguments);
-    }
-    on.fn = fn;
-    vm.$on(event, on);
-    return vm
-  };
-
-  Vue.prototype.$off = function (event, fn) {
-    var vm = this;
-    // all
-    if (!arguments.length) {
-      vm._events = Object.create(null);
-      return vm
-    }
-    // array of events
-    if (Array.isArray(event)) {
-      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
-        vm.$off(event[i$1], fn);
-      }
-      return vm
-    }
-    // specific event
-    var cbs = vm._events[event];
-    if (!cbs) {
-      return vm
-    }
-    if (!fn) {
-      vm._events[event] = null;
-      return vm
+  var ret, i, l, keys, key;
+  if (Array.isArray(val) || typeof val === 'string') {
+    ret = new Array(val.length);
+    for (i = 0, l = val.length; i < l; i++) {
+      ret[i] = render(val[i], i);
     }
-    // specific handler
-    var cb;
-    var i = cbs.length;
-    while (i--) {
-      cb = cbs[i];
-      if (cb === fn || cb.fn === fn) {
-        cbs.splice(i, 1);
-        break
-      }
+  } else if (typeof val === 'number') {
+    ret = new Array(val);
+    for (i = 0; i < val; i++) {
+      ret[i] = render(i + 1, i);
     }
-    return vm
-  };
-
-  Vue.prototype.$emit = function (event) {
-    var vm = this;
-    {
-      var lowerCaseEvent = event.toLowerCase();
-      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
-        tip(
-          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
-          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
-          "Note that HTML attributes are case-insensitive and you cannot use " +
-          "v-on to listen to camelCase events when using in-DOM templates. " +
-          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
-        );
+  } else if (isObject(val)) {
+    if (hasSymbol && val[Symbol.iterator]) {
+      ret = [];
+      var iterator = val[Symbol.iterator]();
+      var result = iterator.next();
+      while (!result.done) {
+        ret.push(render(result.value, ret.length));
+        result = iterator.next();
       }
-    }
-    var cbs = vm._events[event];
-    if (cbs) {
-      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
-      var args = toArray(arguments, 1);
-      var info = "event handler for \"" + event + "\"";
-      for (var i = 0, l = cbs.length; i < l; i++) {
-        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+    } else {
+      keys = Object.keys(val);
+      ret = new Array(keys.length);
+      for (i = 0, l = keys.length; i < l; i++) {
+        key = keys[i];
+        ret[i] = render(val[key], key, i);
       }
     }
-    return vm
-  };
+  }
+  if (!isDef(ret)) {
+    ret = [];
+  }
+  (ret)._isVList = true;
+  return ret
 }
 
 /*  */
 
-
-
 /**
- * Runtime helper for resolving raw children VNodes into a slot object.
+ * Runtime helper for rendering <slot>
  */
-function resolveSlots (
-  children,
-  context
+function renderSlot (
+  name,
+  fallback,
+  props,
+  bindObject
 ) {
-  if (!children || !children.length) {
-    return {}
-  }
-  var slots = {};
-  for (var i = 0, l = children.length; i < l; i++) {
-    var child = children[i];
-    var data = child.data;
-    // remove slot attribute if the node is resolved as a Vue slot node
-    if (data && data.attrs && data.attrs.slot) {
-      delete data.attrs.slot;
-    }
-    // named slots should only be respected if the vnode was rendered in the
-    // same context.
-    if ((child.context === context || child.fnContext === context) &&
-      data && data.slot != null
-    ) {
-      var name = data.slot;
-      var slot = (slots[name] || (slots[name] = []));
-      if (child.tag === 'template') {
-        slot.push.apply(slot, child.children || []);
-      } else {
-        slot.push(child);
+  var scopedSlotFn = this.$scopedSlots[name];
+  var nodes;
+  if (scopedSlotFn) { // scoped slot
+    props = props || {};
+    if (bindObject) {
+      if (!isObject(bindObject)) {
+        warn(
+          'slot v-bind without argument expects an Object',
+          this
+        );
       }
-    } else {
-      (slots.default || (slots.default = [])).push(child);
-    }
-  }
-  // ignore slots that contains only whitespace
-  for (var name$1 in slots) {
-    if (slots[name$1].every(isWhitespace)) {
-      delete slots[name$1];
+      props = extend(extend({}, bindObject), props);
     }
+    nodes = scopedSlotFn(props) || fallback;
+  } else {
+    nodes = this.$slots[name] || fallback;
   }
-  return slots
-}
-
-function isWhitespace (node) {
-  return (node.isComment && !node.asyncFactory) || node.text === ' '
-}
 
-function resolveScopedSlots (
-  fns, // see flow/vnode
-  hasDynamicKeys,
-  res
-) {
-  res = res || { $stable: !hasDynamicKeys };
-  for (var i = 0; i < fns.length; i++) {
-    var slot = fns[i];
-    if (Array.isArray(slot)) {
-      resolveScopedSlots(slot, hasDynamicKeys, res);
-    } else if (slot) {
-      res[slot.key] = slot.fn;
-    }
+  var target = props && props.slot;
+  if (target) {
+    return this.$createElement('template', { slot: target }, nodes)
+  } else {
+    return nodes
   }
-  return res
 }
 
 /*  */
 
-var activeInstance = null;
-var isUpdatingChildComponent = false;
-
-function setActiveInstance(vm) {
-  var prevActiveInstance = activeInstance;
-  activeInstance = vm;
-  return function () {
-    activeInstance = prevActiveInstance;
-  }
+/**
+ * Runtime helper for resolving filters
+ */
+function resolveFilter (id) {
+  return resolveAsset(this.$options, 'filters', id, true) || identity
 }
 
-function initLifecycle (vm) {
-  var options = vm.$options;
+/*  */
 
-  // locate first non-abstract parent
-  var parent = options.parent;
-  if (parent && !options.abstract) {
-    while (parent.$options.abstract && parent.$parent) {
-      parent = parent.$parent;
-    }
-    parent.$children.push(vm);
+function isKeyNotMatch (expect, actual) {
+  if (Array.isArray(expect)) {
+    return expect.indexOf(actual) === -1
+  } else {
+    return expect !== actual
   }
+}
 
-  vm.$parent = parent;
-  vm.$root = parent ? parent.$root : vm;
-
-  vm.$children = [];
-  vm.$refs = {};
-
-  vm._watcher = null;
-  vm._inactive = null;
-  vm._directInactive = false;
-  vm._isMounted = false;
-  vm._isDestroyed = false;
-  vm._isBeingDestroyed = false;
+/**
+ * Runtime helper for checking keyCodes from config.
+ * exposed as Vue.prototype._k
+ * passing in eventKeyName as last argument separately for backwards compat
+ */
+function checkKeyCodes (
+  eventKeyCode,
+  key,
+  builtInKeyCode,
+  eventKeyName,
+  builtInKeyName
+) {
+  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+    return isKeyNotMatch(builtInKeyName, eventKeyName)
+  } else if (mappedKeyCode) {
+    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+  } else if (eventKeyName) {
+    return hyphenate(eventKeyName) !== key
+  }
 }
 
-function lifecycleMixin (Vue) {
-  Vue.prototype._update = function (vnode, hydrating) {
-    var vm = this;
-    var prevEl = vm.$el;
-    var prevVnode = vm._vnode;
-    var restoreActiveInstance = setActiveInstance(vm);
-    vm._vnode = vnode;
-    // Vue.prototype.__patch__ is injected in entry points
-    // based on the rendering backend used.
-    if (!prevVnode) {
-      // initial render
-      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+/*  */
+
+/**
+ * Runtime helper for merging v-bind="object" into a VNode's data.
+ */
+function bindObjectProps (
+  data,
+  tag,
+  value,
+  asProp,
+  isSync
+) {
+  if (value) {
+    if (!isObject(value)) {
+      warn(
+        'v-bind without argument expects an Object or Array value',
+        this
+      );
     } else {
-      // updates
-      vm.$el = vm.__patch__(prevVnode, vnode);
-    }
-    restoreActiveInstance();
-    // update __vue__ reference
-    if (prevEl) {
-      prevEl.__vue__ = null;
-    }
-    if (vm.$el) {
-      vm.$el.__vue__ = vm;
-    }
-    // if parent is an HOC, update its $el as well
-    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
-      vm.$parent.$el = vm.$el;
-    }
-    // updated hook is called by the scheduler to ensure that children are
-    // updated in a parent's updated hook.
-  };
+      if (Array.isArray(value)) {
+        value = toObject(value);
+      }
+      var hash;
+      var loop = function ( key ) {
+        if (
+          key === 'class' ||
+          key === 'style' ||
+          isReservedAttribute(key)
+        ) {
+          hash = data;
+        } else {
+          var type = data.attrs && data.attrs.type;
+          hash = asProp || config.mustUseProp(tag, type, key)
+            ? data.domProps || (data.domProps = {})
+            : data.attrs || (data.attrs = {});
+        }
+        var camelizedKey = camelize(key);
+        if (!(key in hash) && !(camelizedKey in hash)) {
+          hash[key] = value[key];
 
-  Vue.prototype.$forceUpdate = function () {
-    var vm = this;
-    if (vm._watcher) {
-      vm._watcher.update();
-    }
-  };
+          if (isSync) {
+            var on = data.on || (data.on = {});
+            on[("update:" + camelizedKey)] = function ($event) {
+              value[key] = $event;
+            };
+          }
+        }
+      };
 
-  Vue.prototype.$destroy = function () {
-    var vm = this;
-    if (vm._isBeingDestroyed) {
-      return
-    }
-    callHook(vm, 'beforeDestroy');
-    vm._isBeingDestroyed = true;
-    // remove self from parent
-    var parent = vm.$parent;
-    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
-      remove(parent.$children, vm);
-    }
-    // teardown watchers
-    if (vm._watcher) {
-      vm._watcher.teardown();
-    }
-    var i = vm._watchers.length;
-    while (i--) {
-      vm._watchers[i].teardown();
-    }
-    // remove reference from data ob
-    // frozen object may not have observer.
-    if (vm._data.__ob__) {
-      vm._data.__ob__.vmCount--;
-    }
-    // call the last hook...
-    vm._isDestroyed = true;
-    // invoke destroy hooks on current rendered tree
-    vm.__patch__(vm._vnode, null);
-    // fire destroyed hook
-    callHook(vm, 'destroyed');
-    // turn off all instance listeners.
-    vm.$off();
-    // remove __vue__ reference
-    if (vm.$el) {
-      vm.$el.__vue__ = null;
-    }
-    // release circular reference (#6759)
-    if (vm.$vnode) {
-      vm.$vnode.parent = null;
+      for (var key in value) loop( key );
     }
-  };
+  }
+  return data
 }
 
-function mountComponent (
-  vm,
-  el,
-  hydrating
+/*  */
+
+/**
+ * Runtime helper for rendering static trees.
+ */
+function renderStatic (
+  index,
+  isInFor
 ) {
-  vm.$el = el;
-  if (!vm.$options.render) {
-    vm.$options.render = createEmptyVNode;
-    {
-      /* istanbul ignore if */
-      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
-        vm.$options.el || el) {
-        warn(
-          'You are using the runtime-only build of Vue where the template ' +
-          'compiler is not available. Either pre-compile the templates into ' +
-          'render functions, or use the compiler-included build.',
-          vm
-        );
-      } else {
-        warn(
-          'Failed to mount component: template or render function not defined.',
-          vm
-        );
-      }
-    }
+  var cached = this._staticTrees || (this._staticTrees = []);
+  var tree = cached[index];
+  // if has already-rendered static tree and not inside v-for,
+  // we can reuse the same tree.
+  if (tree && !isInFor) {
+    return tree
   }
-  callHook(vm, 'beforeMount');
-
-  var updateComponent;
-  /* istanbul ignore if */
-  if (config.performance && mark) {
-    updateComponent = function () {
-      var name = vm._name;
-      var id = vm._uid;
-      var startTag = "vue-perf-start:" + id;
-      var endTag = "vue-perf-end:" + id;
+  // otherwise, render a fresh tree.
+  tree = cached[index] = this.$options.staticRenderFns[index].call(
+    this._renderProxy,
+    null,
+    this // for render fns generated for functional component templates
+  );
+  markStatic(tree, ("__static__" + index), false);
+  return tree
+}
 
-      mark(startTag);
-      var vnode = vm._render();
-      mark(endTag);
-      measure(("vue " + name + " render"), startTag, endTag);
+/**
+ * Runtime helper for v-once.
+ * Effectively it means marking the node as static with a unique key.
+ */
+function markOnce (
+  tree,
+  index,
+  key
+) {
+  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+  return tree
+}
 
-      mark(startTag);
-      vm._update(vnode, hydrating);
-      mark(endTag);
-      measure(("vue " + name + " patch"), startTag, endTag);
-    };
+function markStatic (
+  tree,
+  key,
+  isOnce
+) {
+  if (Array.isArray(tree)) {
+    for (var i = 0; i < tree.length; i++) {
+      if (tree[i] && typeof tree[i] !== 'string') {
+        markStaticNode(tree[i], (key + "_" + i), isOnce);
+      }
+    }
   } else {
-    updateComponent = function () {
-      vm._update(vm._render(), hydrating);
-    };
+    markStaticNode(tree, key, isOnce);
   }
+}
 
-  // we set this to vm._watcher inside the watcher's constructor
-  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
-  // component's mounted hook), which relies on vm._watcher being already defined
-  new Watcher(vm, updateComponent, noop, {
-    before: function before () {
-      if (vm._isMounted && !vm._isDestroyed) {
-        callHook(vm, 'beforeUpdate');
+function markStaticNode (node, key, isOnce) {
+  node.isStatic = true;
+  node.key = key;
+  node.isOnce = isOnce;
+}
+
+/*  */
+
+function bindObjectListeners (data, value) {
+  if (value) {
+    if (!isPlainObject(value)) {
+      warn(
+        'v-on without argument expects an Object value',
+        this
+      );
+    } else {
+      var on = data.on = data.on ? extend({}, data.on) : {};
+      for (var key in value) {
+        var existing = on[key];
+        var ours = value[key];
+        on[key] = existing ? [].concat(existing, ours) : ours;
       }
     }
-  }, true /* isRenderWatcher */);
-  hydrating = false;
-
-  // manually mounted instance, call mounted on self
-  // mounted is called for render-created child components in its inserted hook
-  if (vm.$vnode == null) {
-    vm._isMounted = true;
-    callHook(vm, 'mounted');
   }
-  return vm
+  return data
 }
 
-function updateChildComponent (
-  vm,
-  propsData,
-  listeners,
-  parentVnode,
-  renderChildren
+/*  */
+
+function resolveScopedSlots (
+  fns, // see flow/vnode
+  hasDynamicKeys,
+  res
 ) {
-  {
-    isUpdatingChildComponent = true;
+  res = res || { $stable: !hasDynamicKeys };
+  for (var i = 0; i < fns.length; i++) {
+    var slot = fns[i];
+    if (Array.isArray(slot)) {
+      resolveScopedSlots(slot, hasDynamicKeys, res);
+    } else if (slot) {
+      res[slot.key] = slot.fn;
+    }
   }
+  return res
+}
 
-  // determine whether component has slot children
-  // we need to do this before overwriting $options._renderChildren.
+/*  */
 
-  // check if there are dynamic scopedSlots (hand-written or compiled but with
-  // dynamic slot names). Static scoped slots compiled from template has the
-  // "$stable" marker.
-  var hasDynamicScopedSlot = !!(
-    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-  );
-  // Any static slot children from the parent may have changed during parent's
-  // update. Dynamic scoped slots may also have changed. In such cases, a forced
-  // update is necessary to ensure correctness.
-  var needsForceUpdate = !!(
-    renderChildren ||               // has new static slots
-    vm.$options._renderChildren ||  // has old static slots
-    hasDynamicScopedSlot
-  );
+function bindDynamicKeys (baseObj, values) {
+  for (var i = 0; i < values.length; i += 2) {
+    var key = values[i];
+    if (typeof key === 'string' && key) {
+      baseObj[values[i]] = values[i + 1];
+    } else if (key !== '' && key !== null) {
+      // null is a speical value for explicitly removing a binding
+      warn(
+        ("Invalid value for dynamic directive argument (expected string or null): " + key),
+        this
+      );
+    }
+  }
+  return baseObj
+}
 
-  vm.$options._parentVnode = parentVnode;
-  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+// helper to dynamically append modifier runtime markers to event names.
+// ensure only append when value is already string, otherwise it will be cast
+// to string and cause the type check to miss.
+function prependModifier (value, symbol) {
+  return typeof value === 'string' ? symbol + value : value
+}
 
-  if (vm._vnode) { // update child tree's parent
-    vm._vnode.parent = parentVnode;
-  }
-  vm.$options._renderChildren = renderChildren;
+/*  */
 
-  // update $attrs and $listeners hash
-  // these are also reactive so they may trigger child update if the child
-  // used them during render
-  vm.$attrs = parentVnode.data.attrs || emptyObject;
-  vm.$listeners = listeners || emptyObject;
+function installRenderHelpers (target) {
+  target._o = markOnce;
+  target._n = toNumber;
+  target._s = toString;
+  target._l = renderList;
+  target._t = renderSlot;
+  target._q = looseEqual;
+  target._i = looseIndexOf;
+  target._m = renderStatic;
+  target._f = resolveFilter;
+  target._k = checkKeyCodes;
+  target._b = bindObjectProps;
+  target._v = createTextVNode;
+  target._e = createEmptyVNode;
+  target._u = resolveScopedSlots;
+  target._g = bindObjectListeners;
+  target._d = bindDynamicKeys;
+  target._p = prependModifier;
+}
 
-  // update props
-  if (propsData && vm.$options.props) {
-    toggleObserving(false);
-    var props = vm._props;
-    var propKeys = vm.$options._propKeys || [];
-    for (var i = 0; i < propKeys.length; i++) {
-      var key = propKeys[i];
-      var propOptions = vm.$options.props; // wtf flow?
-      props[key] = validateProp(key, propOptions, propsData, vm);
-    }
-    toggleObserving(true);
-    // keep a copy of raw propsData
-    vm.$options.propsData = propsData;
+/*  */
+
+function FunctionalRenderContext (
+  data,
+  props,
+  children,
+  parent,
+  Ctor
+) {
+  var options = Ctor.options;
+  // ensure the createElement function in functional components
+  // gets a unique context - this is necessary for correct named slot check
+  var contextVm;
+  if (hasOwn(parent, '_uid')) {
+    contextVm = Object.create(parent);
+    // $flow-disable-line
+    contextVm._original = parent;
+  } else {
+    // the context vm passed in is a functional context as well.
+    // in this case we want to make sure we are able to get a hold to the
+    // real context instance.
+    contextVm = parent;
+    // $flow-disable-line
+    parent = parent._original;
   }
+  var isCompiled = isTrue(options._compiled);
+  var needNormalization = !isCompiled;
 
-  // update listeners
-  listeners = listeners || emptyObject;
-  var oldListeners = vm.$options._parentListeners;
-  vm.$options._parentListeners = listeners;
-  updateComponentListeners(vm, listeners, oldListeners);
+  this.data = data;
+  this.props = props;
+  this.children = children;
+  this.parent = parent;
+  this.listeners = data.on || emptyObject;
+  this.injections = resolveInject(options.inject, parent);
+  this.slots = function () { return resolveSlots(children, parent); };
 
-  // resolve slots + force update if has children
-  if (needsForceUpdate) {
-    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-    vm.$forceUpdate();
-  }
+  Object.defineProperty(this, 'scopedSlots', ({
+    enumerable: true,
+    get: function get () {
+      return normalizeScopedSlots(data.scopedSlots, this.slots())
+    }
+  }));
 
-  {
-    isUpdatingChildComponent = false;
+  // support for compiled functional template
+  if (isCompiled) {
+    // exposing $options for renderStatic()
+    this.$options = options;
+    // pre-resolve slots for renderSlot()
+    this.$slots = this.slots();
+    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
   }
-}
 
-function isInInactiveTree (vm) {
-  while (vm && (vm = vm.$parent)) {
-    if (vm._inactive) { return true }
+  if (options._scopeId) {
+    this._c = function (a, b, c, d) {
+      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
+      if (vnode && !Array.isArray(vnode)) {
+        vnode.fnScopeId = options._scopeId;
+        vnode.fnContext = parent;
+      }
+      return vnode
+    };
+  } else {
+    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
   }
-  return false
 }
 
-function activateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = false;
-    if (isInInactiveTree(vm)) {
-      return
+installRenderHelpers(FunctionalRenderContext.prototype);
+
+function createFunctionalComponent (
+  Ctor,
+  propsData,
+  data,
+  contextVm,
+  children
+) {
+  var options = Ctor.options;
+  var props = {};
+  var propOptions = options.props;
+  if (isDef(propOptions)) {
+    for (var key in propOptions) {
+      props[key] = validateProp(key, propOptions, propsData || emptyObject);
     }
-  } else if (vm._directInactive) {
-    return
+  } else {
+    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
+    if (isDef(data.props)) { mergeProps(props, data.props); }
   }
-  if (vm._inactive || vm._inactive === null) {
-    vm._inactive = false;
-    for (var i = 0; i < vm.$children.length; i++) {
-      activateChildComponent(vm.$children[i]);
+
+  var renderContext = new FunctionalRenderContext(
+    data,
+    props,
+    children,
+    contextVm,
+    Ctor
+  );
+
+  var vnode = options.render.call(null, renderContext._c, renderContext);
+
+  if (vnode instanceof VNode) {
+    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+  } else if (Array.isArray(vnode)) {
+    var vnodes = normalizeChildren(vnode) || [];
+    var res = new Array(vnodes.length);
+    for (var i = 0; i < vnodes.length; i++) {
+      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
     }
-    callHook(vm, 'activated');
+    return res
   }
 }
 
-function deactivateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = true;
-    if (isInInactiveTree(vm)) {
-      return
-    }
+function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+  // #7817 clone node before setting fnContext, otherwise if the node is reused
+  // (e.g. it was from a cached normal slot) the fnContext causes named slots
+  // that should not be matched to match.
+  var clone = cloneVNode(vnode);
+  clone.fnContext = contextVm;
+  clone.fnOptions = options;
+  {
+    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
   }
-  if (!vm._inactive) {
-    vm._inactive = true;
-    for (var i = 0; i < vm.$children.length; i++) {
-      deactivateChildComponent(vm.$children[i]);
-    }
-    callHook(vm, 'deactivated');
+  if (data.slot) {
+    (clone.data || (clone.data = {})).slot = data.slot;
   }
+  return clone
 }
 
-function callHook (vm, hook) {
-  // #7573 disable dep collection when invoking lifecycle hooks
-  pushTarget();
-  var handlers = vm.$options[hook];
-  var info = hook + " hook";
-  if (handlers) {
-    for (var i = 0, j = handlers.length; i < j; i++) {
-      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
-    }
-  }
-  if (vm._hasHookEvent) {
-    vm.$emit('hook:' + hook);
+function mergeProps (to, from) {
+  for (var key in from) {
+    to[camelize(key)] = from[key];
   }
-  popTarget();
 }
 
 /*  */
 
-var MAX_UPDATE_COUNT = 100;
+/*  */
 
-var queue = [];
-var activatedChildren = [];
-var has = {};
-var circular = {};
-var waiting = false;
-var flushing = false;
-var index = 0;
+/*  */
 
-/**
- * Reset the scheduler's state.
- */
-function resetSchedulerState () {
-  index = queue.length = activatedChildren.length = 0;
-  has = {};
-  {
-    circular = {};
-  }
-  waiting = flushing = false;
-}
+/*  */
 
-// Async edge case #6566 requires saving the timestamp when event listeners are
-// attached. However, calling performance.now() has a perf overhead especially
-// if the page has thousands of event listeners. Instead, we take a timestamp
-// every time the scheduler flushes and use that for all event listeners
-// attached during that flush.
-var currentFlushTimestamp = 0;
+// inline hooks to be invoked on component VNodes during patch
+var componentVNodeHooks = {
+  init: function init (vnode, hydrating) {
+    if (
+      vnode.componentInstance &&
+      !vnode.componentInstance._isDestroyed &&
+      vnode.data.keepAlive
+    ) {
+      // kept-alive components, treat as a patch
+      var mountedNode = vnode; // work around flow
+      componentVNodeHooks.prepatch(mountedNode, mountedNode);
+    } else {
+      var child = vnode.componentInstance = createComponentInstanceForVnode(
+        vnode,
+        activeInstance
+      );
+      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
+    }
+  },
 
-// Async edge case fix requires storing an event listener's attach timestamp.
-var getNow = Date.now;
+  prepatch: function prepatch (oldVnode, vnode) {
+    var options = vnode.componentOptions;
+    var child = vnode.componentInstance = oldVnode.componentInstance;
+    updateChildComponent(
+      child,
+      options.propsData, // updated props
+      options.listeners, // updated listeners
+      vnode, // new parent vnode
+      options.children // new children
+    );
+  },
 
-// Determine what event timestamp the browser is using. Annoyingly, the
-// timestamp can either be hi-res ( relative to poge load) or low-res
-// (relative to UNIX epoch), so in order to compare time we have to use the
-// same timestamp type when saving the flush timestamp.
-if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-  // if the low-res timestamp which is bigger than the event timestamp
-  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-  // and we need to use the hi-res version for event listeners as well.
-  getNow = function () { return performance.now(); };
-}
+  insert: function insert (vnode) {
+    var context = vnode.context;
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isMounted) {
+      componentInstance._isMounted = true;
+      callHook(componentInstance, 'mounted');
+    }
+    if (vnode.data.keepAlive) {
+      if (context._isMounted) {
+        // vue-router#1212
+        // During updates, a kept-alive component's child components may
+        // change, so directly walking the tree here may call activated hooks
+        // on incorrect children. Instead we push them into a queue which will
+        // be processed after the whole patch process ended.
+        queueActivatedComponent(componentInstance);
+      } else {
+        activateChildComponent(componentInstance, true /* direct */);
+      }
+    }
+  },
 
-/**
- * Flush both queues and run the watchers.
- */
-function flushSchedulerQueue () {
-  currentFlushTimestamp = getNow();
-  flushing = true;
-  var watcher, id;
+  destroy: function destroy (vnode) {
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isDestroyed) {
+      if (!vnode.data.keepAlive) {
+        componentInstance.$destroy();
+      } else {
+        deactivateChildComponent(componentInstance, true /* direct */);
+      }
+    }
+  }
+};
 
-  // Sort queue before flush.
-  // This ensures that:
-  // 1. Components are updated from parent to child. (because parent is always
-  //    created before the child)
-  // 2. A component's user watchers are run before its render watcher (because
-  //    user watchers are created before the render watcher)
-  // 3. If a component is destroyed during a parent component's watcher run,
-  //    its watchers can be skipped.
-  queue.sort(function (a, b) { return a.id - b.id; });
+var hooksToMerge = Object.keys(componentVNodeHooks);
 
-  // do not cache length because more watchers might be pushed
-  // as we run existing watchers
-  for (index = 0; index < queue.length; index++) {
-    watcher = queue[index];
-    if (watcher.before) {
-      watcher.before();
+function createComponent (
+  Ctor,
+  data,
+  context,
+  children,
+  tag
+) {
+  if (isUndef(Ctor)) {
+    return
+  }
+
+  var baseCtor = context.$options._base;
+
+  // plain options object: turn it into a constructor
+  if (isObject(Ctor)) {
+    Ctor = baseCtor.extend(Ctor);
+  }
+
+  // if at this stage it's not a constructor or an async component factory,
+  // reject.
+  if (typeof Ctor !== 'function') {
+    {
+      warn(("Invalid Component definition: " + (String(Ctor))), context);
     }
-    id = watcher.id;
-    has[id] = null;
-    watcher.run();
-    // in dev build, check and stop circular updates.
-    if (has[id] != null) {
-      circular[id] = (circular[id] || 0) + 1;
-      if (circular[id] > MAX_UPDATE_COUNT) {
-        warn(
-          'You may have an infinite update loop ' + (
-            watcher.user
-              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
-              : "in a component render function."
-          ),
-          watcher.vm
-        );
-        break
-      }
+    return
+  }
+
+  // async component
+  var asyncFactory;
+  if (isUndef(Ctor.cid)) {
+    asyncFactory = Ctor;
+    Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+    if (Ctor === undefined) {
+      // return a placeholder node for async component, which is rendered
+      // as a comment node but preserves all the raw information for the node.
+      // the information will be used for async server-rendering and hydration.
+      return createAsyncPlaceholder(
+        asyncFactory,
+        data,
+        context,
+        children,
+        tag
+      )
     }
   }
 
-  // keep copies of post queues before resetting state
-  var activatedQueue = activatedChildren.slice();
-  var updatedQueue = queue.slice();
+  data = data || {};
 
-  resetSchedulerState();
+  // resolve constructor options in case global mixins are applied after
+  // component constructor creation
+  resolveConstructorOptions(Ctor);
 
-  // call component updated and activated hooks
-  callActivatedHooks(activatedQueue);
-  callUpdatedHooks(updatedQueue);
+  // transform component v-model data into props & events
+  if (isDef(data.model)) {
+    transformModel(Ctor.options, data);
+  }
 
-  // devtool hook
-  /* istanbul ignore if */
-  if (devtools && config.devtools) {
-    devtools.emit('flush');
+  // extract props
+  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+
+  // functional component
+  if (isTrue(Ctor.options.functional)) {
+    return createFunctionalComponent(Ctor, propsData, data, context, children)
   }
-}
 
-function callUpdatedHooks (queue) {
-  var i = queue.length;
-  while (i--) {
-    var watcher = queue[i];
-    var vm = watcher.vm;
-    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
-      callHook(vm, 'updated');
+  // extract listeners, since these needs to be treated as
+  // child component listeners instead of DOM listeners
+  var listeners = data.on;
+  // replace with listeners with .native modifier
+  // so it gets processed during parent component patch.
+  data.on = data.nativeOn;
+
+  if (isTrue(Ctor.options.abstract)) {
+    // abstract components do not keep anything
+    // other than props & listeners & slot
+
+    // work around flow
+    var slot = data.slot;
+    data = {};
+    if (slot) {
+      data.slot = slot;
     }
   }
-}
 
-/**
- * Queue a kept-alive component that was activated during patch.
- * The queue will be processed after the entire tree has been patched.
- */
-function queueActivatedComponent (vm) {
-  // setting _inactive to false here so that a render function can
-  // rely on checking whether it's in an inactive tree (e.g. router-view)
-  vm._inactive = false;
-  activatedChildren.push(vm);
+  // install component management hooks onto the placeholder node
+  installComponentHooks(data);
+
+  // return a placeholder vnode
+  var name = Ctor.options.name || tag;
+  var vnode = new VNode(
+    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
+    data, undefined, undefined, undefined, context,
+    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
+    asyncFactory
+  );
+
+  return vnode
 }
 
-function callActivatedHooks (queue) {
-  for (var i = 0; i < queue.length; i++) {
-    queue[i]._inactive = true;
-    activateChildComponent(queue[i], true /* true */);
+function createComponentInstanceForVnode (
+  vnode, // we know it's MountedComponentVNode but flow doesn't
+  parent // activeInstance in lifecycle state
+) {
+  var options = {
+    _isComponent: true,
+    _parentVnode: vnode,
+    parent: parent
+  };
+  // check inline-template render functions
+  var inlineTemplate = vnode.data.inlineTemplate;
+  if (isDef(inlineTemplate)) {
+    options.render = inlineTemplate.render;
+    options.staticRenderFns = inlineTemplate.staticRenderFns;
   }
+  return new vnode.componentOptions.Ctor(options)
 }
 
-/**
- * Push a watcher into the watcher queue.
- * Jobs with duplicate IDs will be skipped unless it's
- * pushed when the queue is being flushed.
- */
-function queueWatcher (watcher) {
-  var id = watcher.id;
-  if (has[id] == null) {
-    has[id] = true;
-    if (!flushing) {
-      queue.push(watcher);
-    } else {
-      // if already flushing, splice the watcher based on its id
-      // if already past its id, it will be run next immediately.
-      var i = queue.length - 1;
-      while (i > index && queue[i].id > watcher.id) {
-        i--;
-      }
-      queue.splice(i + 1, 0, watcher);
+function installComponentHooks (data) {
+  var hooks = data.hook || (data.hook = {});
+  for (var i = 0; i < hooksToMerge.length; i++) {
+    var key = hooksToMerge[i];
+    var existing = hooks[key];
+    var toMerge = componentVNodeHooks[key];
+    if (existing !== toMerge && !(existing && existing._merged)) {
+      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
     }
-    // queue the flush
-    if (!waiting) {
-      waiting = true;
+  }
+}
 
-      if (!config.async) {
-        flushSchedulerQueue();
-        return
-      }
-      nextTick(flushSchedulerQueue);
+function mergeHook$1 (f1, f2) {
+  var merged = function (a, b) {
+    // flow complains about extra args which is why we use any
+    f1(a, b);
+    f2(a, b);
+  };
+  merged._merged = true;
+  return merged
+}
+
+// transform component v-model info (value and callback) into
+// prop and event handler respectively.
+function transformModel (options, data) {
+  var prop = (options.model && options.model.prop) || 'value';
+  var event = (options.model && options.model.event) || 'input'
+  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+  var on = data.on || (data.on = {});
+  var existing = on[event];
+  var callback = data.model.callback;
+  if (isDef(existing)) {
+    if (
+      Array.isArray(existing)
+        ? existing.indexOf(callback) === -1
+        : existing !== callback
+    ) {
+      on[event] = [callback].concat(existing);
     }
+  } else {
+    on[event] = callback;
   }
 }
 
 /*  */
 
+var SIMPLE_NORMALIZE = 1;
+var ALWAYS_NORMALIZE = 2;
 
+// wrapper function for providing a more flexible interface
+// without getting yelled at by flow
+function createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType,
+  alwaysNormalize
+) {
+  if (Array.isArray(data) || isPrimitive(data)) {
+    normalizationType = children;
+    children = data;
+    data = undefined;
+  }
+  if (isTrue(alwaysNormalize)) {
+    normalizationType = ALWAYS_NORMALIZE;
+  }
+  return _createElement(context, tag, data, children, normalizationType)
+}
 
-var uid$1 = 0;
-
-/**
- * A watcher parses an expression, collects dependencies,
- * and fires callback when the expression value changes.
- * This is used for both the $watch() api and directives.
- */
-var Watcher = function Watcher (
-  vm,
-  expOrFn,
-  cb,
-  options,
-  isRenderWatcher
+function _createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType
 ) {
-  this.vm = vm;
-  if (isRenderWatcher) {
-    vm._watcher = this;
+  if (isDef(data) && isDef((data).__ob__)) {
+    warn(
+      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+      'Always create fresh vnode data objects in each render!',
+      context
+    );
+    return createEmptyVNode()
   }
-  vm._watchers.push(this);
-  // options
-  if (options) {
-    this.deep = !!options.deep;
-    this.user = !!options.user;
-    this.lazy = !!options.lazy;
-    this.sync = !!options.sync;
-    this.before = options.before;
+  // object syntax in v-bind
+  if (isDef(data) && isDef(data.is)) {
+    tag = data.is;
+  }
+  if (!tag) {
+    // in case of component :is set to falsy value
+    return createEmptyVNode()
+  }
+  // warn against non-primitive key
+  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+  ) {
+    {
+      warn(
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
+      );
+    }
+  }
+  // support single function children as default scoped slot
+  if (Array.isArray(children) &&
+    typeof children[0] === 'function'
+  ) {
+    data = data || {};
+    data.scopedSlots = { default: children[0] };
+    children.length = 0;
+  }
+  if (normalizationType === ALWAYS_NORMALIZE) {
+    children = normalizeChildren(children);
+  } else if (normalizationType === SIMPLE_NORMALIZE) {
+    children = simpleNormalizeChildren(children);
+  }
+  var vnode, ns;
+  if (typeof tag === 'string') {
+    var Ctor;
+    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+    if (config.isReservedTag(tag)) {
+      // platform built-in elements
+      vnode = new VNode(
+        config.parsePlatformTagName(tag), data, children,
+        undefined, undefined, context
+      );
+    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+      // component
+      vnode = createComponent(Ctor, data, context, children, tag);
+    } else {
+      // unknown or unlisted namespaced elements
+      // check at runtime because it may get assigned a namespace when its
+      // parent normalizes children
+      vnode = new VNode(
+        tag, data, children,
+        undefined, undefined, context
+      );
+    }
   } else {
-    this.deep = this.user = this.lazy = this.sync = false;
+    // direct component options / constructor
+    vnode = createComponent(tag, data, context, children);
   }
-  this.cb = cb;
-  this.id = ++uid$1; // uid for batching
-  this.active = true;
-  this.dirty = this.lazy; // for lazy watchers
-  this.deps = [];
-  this.newDeps = [];
-  this.depIds = new _Set();
-  this.newDepIds = new _Set();
-  this.expression = expOrFn.toString();
-  // parse expression for getter
-  if (typeof expOrFn === 'function') {
-    this.getter = expOrFn;
+  if (Array.isArray(vnode)) {
+    return vnode
+  } else if (isDef(vnode)) {
+    if (isDef(ns)) { applyNS(vnode, ns); }
+    if (isDef(data)) { registerDeepBindings(data); }
+    return vnode
   } else {
-    this.getter = parsePath(expOrFn);
-    if (!this.getter) {
-      this.getter = noop;
-      warn(
-        "Failed watching path: \"" + expOrFn + "\" " +
-        'Watcher only accepts simple dot-delimited paths. ' +
-        'For full control, use a function instead.',
-        vm
-      );
-    }
+    return createEmptyVNode()
   }
-  this.value = this.lazy
-    ? undefined
-    : this.get();
-};
+}
 
-/**
- * Evaluate the getter, and re-collect dependencies.
- */
-Watcher.prototype.get = function get () {
-  pushTarget(this);
-  var value;
-  var vm = this.vm;
-  try {
-    value = this.getter.call(vm, vm);
-  } catch (e) {
-    if (this.user) {
-      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
-    } else {
-      throw e
-    }
-  } finally {
-    // "touch" every property so they are all tracked as
-    // dependencies for deep watching
-    if (this.deep) {
-      traverse(value);
-    }
-    popTarget();
-    this.cleanupDeps();
+function applyNS (vnode, ns, force) {
+  vnode.ns = ns;
+  if (vnode.tag === 'foreignObject') {
+    // use default namespace inside foreignObject
+    ns = undefined;
+    force = true;
   }
-  return value
-};
-
-/**
- * Add a dependency to this directive.
- */
-Watcher.prototype.addDep = function addDep (dep) {
-  var id = dep.id;
-  if (!this.newDepIds.has(id)) {
-    this.newDepIds.add(id);
-    this.newDeps.push(dep);
-    if (!this.depIds.has(id)) {
-      dep.addSub(this);
+  if (isDef(vnode.children)) {
+    for (var i = 0, l = vnode.children.length; i < l; i++) {
+      var child = vnode.children[i];
+      if (isDef(child.tag) && (
+        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+        applyNS(child, ns, force);
+      }
     }
   }
-};
+}
 
-/**
- * Clean up for dependency collection.
- */
-Watcher.prototype.cleanupDeps = function cleanupDeps () {
-  var i = this.deps.length;
-  while (i--) {
-    var dep = this.deps[i];
-    if (!this.newDepIds.has(dep.id)) {
-      dep.removeSub(this);
-    }
+// ref #5318
+// necessary to ensure parent re-render when deep bindings like :style and
+// :class are used on slot nodes
+function registerDeepBindings (data) {
+  if (isObject(data.style)) {
+    traverse(data.style);
   }
-  var tmp = this.depIds;
-  this.depIds = this.newDepIds;
-  this.newDepIds = tmp;
-  this.newDepIds.clear();
-  tmp = this.deps;
-  this.deps = this.newDeps;
-  this.newDeps = tmp;
-  this.newDeps.length = 0;
-};
+  if (isObject(data.class)) {
+    traverse(data.class);
+  }
+}
+
+/*  */
+
+function initRender (vm) {
+  vm._vnode = null; // the root of the child tree
+  vm._staticTrees = null; // v-once cached trees
+  var options = vm.$options;
+  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+  var renderContext = parentVnode && parentVnode.context;
+  vm.$slots = resolveSlots(options._renderChildren, renderContext);
+  vm.$scopedSlots = emptyObject;
+  // bind the createElement fn to this instance
+  // so that we get proper render context inside it.
+  // args order: tag, data, children, normalizationType, alwaysNormalize
+  // internal version is used by render functions compiled from templates
+  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
+  // normalization is always applied for the public version, used in
+  // user-written render functions.
+  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+
+  // $attrs & $listeners are exposed for easier HOC creation.
+  // they need to be reactive so that HOCs using them are always updated
+  var parentData = parentVnode && parentVnode.data;
 
-/**
- * Subscriber interface.
- * Will be called when a dependency changes.
- */
-Watcher.prototype.update = function update () {
   /* istanbul ignore else */
-  if (this.lazy) {
-    this.dirty = true;
-  } else if (this.sync) {
-    this.run();
-  } else {
-    queueWatcher(this);
+  {
+    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
+    }, true);
+    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
+    }, true);
   }
-};
+}
 
-/**
- * Scheduler job interface.
- * Will be called by the scheduler.
- */
-Watcher.prototype.run = function run () {
-  if (this.active) {
-    var value = this.get();
-    if (
-      value !== this.value ||
-      // Deep watchers and watchers on Object/Arrays should fire even
-      // when the value is the same, because the value may
-      // have mutated.
-      isObject(value) ||
-      this.deep
-    ) {
-      // set new value
-      var oldValue = this.value;
-      this.value = value;
-      if (this.user) {
-        try {
-          this.cb.call(this.vm, value, oldValue);
-        } catch (e) {
-          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
-        }
-      } else {
-        this.cb.call(this.vm, value, oldValue);
-      }
-    }
-  }
-};
+var currentRenderingInstance = null;
 
-/**
- * Evaluate the value of the watcher.
- * This only gets called for lazy watchers.
- */
-Watcher.prototype.evaluate = function evaluate () {
-  this.value = this.get();
-  this.dirty = false;
-};
+function renderMixin (Vue) {
+  // install runtime convenience helpers
+  installRenderHelpers(Vue.prototype);
 
-/**
- * Depend on all deps collected by this watcher.
- */
-Watcher.prototype.depend = function depend () {
-  var i = this.deps.length;
-  while (i--) {
-    this.deps[i].depend();
-  }
-};
+  Vue.prototype.$nextTick = function (fn) {
+    return nextTick(fn, this)
+  };
 
-/**
- * Remove self from all dependencies' subscriber list.
- */
-Watcher.prototype.teardown = function teardown () {
-  if (this.active) {
-    // remove self from vm's watcher list
-    // this is a somewhat expensive operation so we skip it
-    // if the vm is being destroyed.
-    if (!this.vm._isBeingDestroyed) {
-      remove(this.vm._watchers, this);
+  Vue.prototype._render = function () {
+    var vm = this;
+    var ref = vm.$options;
+    var render = ref.render;
+    var _parentVnode = ref._parentVnode;
+
+    if (_parentVnode) {
+      vm.$scopedSlots = normalizeScopedSlots(
+        _parentVnode.data.scopedSlots,
+        vm.$slots
+      );
+    }
+
+    // set parent vnode. this allows render functions to have access
+    // to the data on the placeholder node.
+    vm.$vnode = _parentVnode;
+    // render self
+    var vnode;
+    try {
+      // There's no need to maintain a stack becaues all render fns are called
+      // separately from one another. Nested component's render fns are called
+      // when parent component is patched.
+      currentRenderingInstance = vm;
+      vnode = render.call(vm._renderProxy, vm.$createElement);
+    } catch (e) {
+      handleError(e, vm, "render");
+      // return error render result,
+      // or previous vnode to prevent render error causing blank component
+      /* istanbul ignore else */
+      if (vm.$options.renderError) {
+        try {
+          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+        } catch (e) {
+          handleError(e, vm, "renderError");
+          vnode = vm._vnode;
+        }
+      } else {
+        vnode = vm._vnode;
+      }
+    } finally {
+      currentRenderingInstance = null;
     }
-    var i = this.deps.length;
-    while (i--) {
-      this.deps[i].removeSub(this);
+    // if the returned array contains only a single node, allow it
+    if (Array.isArray(vnode) && vnode.length === 1) {
+      vnode = vnode[0];
     }
-    this.active = false;
-  }
-};
+    // return empty vnode in case the render function errored out
+    if (!(vnode instanceof VNode)) {
+      if (Array.isArray(vnode)) {
+        warn(
+          'Multiple root nodes returned from render function. Render function ' +
+          'should return a single root node.',
+          vm
+        );
+      }
+      vnode = createEmptyVNode();
+    }
+    // set parent
+    vnode.parent = _parentVnode;
+    return vnode
+  };
+}
 
 /*  */
 
-var sharedPropertyDefinition = {
-  enumerable: true,
-  configurable: true,
-  get: noop,
-  set: noop
-};
+function ensureCtor (comp, base) {
+  if (
+    comp.__esModule ||
+    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+  ) {
+    comp = comp.default;
+  }
+  return isObject(comp)
+    ? base.extend(comp)
+    : comp
+}
 
-function proxy (target, sourceKey, key) {
-  sharedPropertyDefinition.get = function proxyGetter () {
-    return this[sourceKey][key]
-  };
-  sharedPropertyDefinition.set = function proxySetter (val) {
-    this[sourceKey][key] = val;
-  };
-  Object.defineProperty(target, key, sharedPropertyDefinition);
+function createAsyncPlaceholder (
+  factory,
+  data,
+  context,
+  children,
+  tag
+) {
+  var node = createEmptyVNode();
+  node.asyncFactory = factory;
+  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+  return node
 }
 
-function initState (vm) {
-  vm._watchers = [];
-  var opts = vm.$options;
-  if (opts.props) { initProps(vm, opts.props); }
-  if (opts.methods) { initMethods(vm, opts.methods); }
-  if (opts.data) {
-    initData(vm);
-  } else {
-    observe(vm._data = {}, true /* asRootData */);
+function resolveAsyncComponent (
+  factory,
+  baseCtor
+) {
+  if (isTrue(factory.error) && isDef(factory.errorComp)) {
+    return factory.errorComp
   }
-  if (opts.computed) { initComputed(vm, opts.computed); }
-  if (opts.watch && opts.watch !== nativeWatch) {
-    initWatch(vm, opts.watch);
+
+  if (isDef(factory.resolved)) {
+    return factory.resolved
   }
-}
 
-function initProps (vm, propsOptions) {
-  var propsData = vm.$options.propsData || {};
-  var props = vm._props = {};
-  // cache prop keys so that future props updates can iterate using Array
-  // instead of dynamic object key enumeration.
-  var keys = vm.$options._propKeys = [];
-  var isRoot = !vm.$parent;
-  // root instance props should be converted
-  if (!isRoot) {
-    toggleObserving(false);
+  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+    return factory.loadingComp
   }
-  var loop = function ( key ) {
-    keys.push(key);
-    var value = validateProp(key, propsOptions, propsData, vm);
-    /* istanbul ignore else */
-    {
-      var hyphenatedKey = hyphenate(key);
-      if (isReservedAttribute(hyphenatedKey) ||
-          config.isReservedAttr(hyphenatedKey)) {
-        warn(
-          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
-          vm
-        );
+
+  var owner = currentRenderingInstance;
+  if (isDef(factory.owners)) {
+    // already pending
+    factory.owners.push(owner);
+  } else {
+    var owners = factory.owners = [owner];
+    var sync = true;
+
+    var forceRender = function (renderCompleted) {
+      for (var i = 0, l = owners.length; i < l; i++) {
+        (owners[i]).$forceUpdate();
       }
-      defineReactive$$1(props, key, value, function () {
-        if (!isRoot && !isUpdatingChildComponent) {
-          warn(
-            "Avoid mutating a prop directly since the value will be " +
-            "overwritten whenever the parent component re-renders. " +
-            "Instead, use a data or computed property based on the prop's " +
-            "value. Prop being mutated: \"" + key + "\"",
-            vm
-          );
-        }
-      });
-    }
-    // static props are already proxied on the component's prototype
-    // during Vue.extend(). We only need to proxy props defined at
-    // instantiation here.
-    if (!(key in vm)) {
-      proxy(vm, "_props", key);
-    }
-  };
 
-  for (var key in propsOptions) loop( key );
-  toggleObserving(true);
-}
+      if (renderCompleted) {
+        owners.length = 0;
+      }
+    };
 
-function initData (vm) {
-  var data = vm.$options.data;
-  data = vm._data = typeof data === 'function'
-    ? getData(data, vm)
-    : data || {};
-  if (!isPlainObject(data)) {
-    data = {};
-    warn(
-      'data functions should return an object:\n' +
-      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
-      vm
-    );
-  }
-  // proxy data on instance
-  var keys = Object.keys(data);
-  var props = vm.$options.props;
-  var methods = vm.$options.methods;
-  var i = keys.length;
-  while (i--) {
-    var key = keys[i];
-    {
-      if (methods && hasOwn(methods, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a data property."),
-          vm
-        );
+    var resolve = once(function (res) {
+      // cache resolved
+      factory.resolved = ensureCtor(res, baseCtor);
+      // invoke callbacks only if this is not a synchronous resolve
+      // (async resolves are shimmed as synchronous during SSR)
+      if (!sync) {
+        forceRender(true);
+      } else {
+        owners.length = 0;
       }
-    }
-    if (props && hasOwn(props, key)) {
+    });
+
+    var reject = once(function (reason) {
       warn(
-        "The data property \"" + key + "\" is already declared as a prop. " +
-        "Use prop default value instead.",
-        vm
+        "Failed to resolve async component: " + (String(factory)) +
+        (reason ? ("\nReason: " + reason) : '')
       );
-    } else if (!isReserved(key)) {
-      proxy(vm, "_data", key);
+      if (isDef(factory.errorComp)) {
+        factory.error = true;
+        forceRender(true);
+      }
+    });
+
+    var res = factory(resolve, reject);
+
+    if (isObject(res)) {
+      if (isPromise(res)) {
+        // () => Promise
+        if (isUndef(factory.resolved)) {
+          res.then(resolve, reject);
+        }
+      } else if (isPromise(res.component)) {
+        res.component.then(resolve, reject);
+
+        if (isDef(res.error)) {
+          factory.errorComp = ensureCtor(res.error, baseCtor);
+        }
+
+        if (isDef(res.loading)) {
+          factory.loadingComp = ensureCtor(res.loading, baseCtor);
+          if (res.delay === 0) {
+            factory.loading = true;
+          } else {
+            setTimeout(function () {
+              if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                factory.loading = true;
+                forceRender(false);
+              }
+            }, res.delay || 200);
+          }
+        }
+
+        if (isDef(res.timeout)) {
+          setTimeout(function () {
+            if (isUndef(factory.resolved)) {
+              reject(
+                "timeout (" + (res.timeout) + "ms)"
+              );
+            }
+          }, res.timeout);
+        }
+      }
     }
-  }
-  // observe data
-  observe(data, true /* asRootData */);
-}
 
-function getData (data, vm) {
-  // #7573 disable dep collection when invoking data getters
-  pushTarget();
-  try {
-    return data.call(vm, vm)
-  } catch (e) {
-    handleError(e, vm, "data()");
-    return {}
-  } finally {
-    popTarget();
+    sync = false;
+    // return in case resolved synchronously
+    return factory.loading
+      ? factory.loadingComp
+      : factory.resolved
   }
 }
 
-var computedWatcherOptions = { lazy: true };
-
-function initComputed (vm, computed) {
-  // $flow-disable-line
-  var watchers = vm._computedWatchers = Object.create(null);
-  // computed properties are just getters during SSR
-  var isSSR = isServerRendering();
+/*  */
 
-  for (var key in computed) {
-    var userDef = computed[key];
-    var getter = typeof userDef === 'function' ? userDef : userDef.get;
-    if (getter == null) {
-      warn(
-        ("Getter is missing for computed property \"" + key + "\"."),
-        vm
-      );
-    }
+function isAsyncPlaceholder (node) {
+  return node.isComment && node.asyncFactory
+}
 
-    if (!isSSR) {
-      // create internal watcher for the computed property.
-      watchers[key] = new Watcher(
-        vm,
-        getter || noop,
-        noop,
-        computedWatcherOptions
-      );
-    }
+/*  */
 
-    // component-defined computed properties are already defined on the
-    // component prototype. We only need to define computed properties defined
-    // at instantiation here.
-    if (!(key in vm)) {
-      defineComputed(vm, key, userDef);
-    } else {
-      if (key in vm.$data) {
-        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
-      } else if (vm.$options.props && key in vm.$options.props) {
-        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+function getFirstComponentChild (children) {
+  if (Array.isArray(children)) {
+    for (var i = 0; i < children.length; i++) {
+      var c = children[i];
+      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+        return c
       }
     }
   }
 }
 
-function defineComputed (
-  target,
-  key,
-  userDef
-) {
-  var shouldCache = !isServerRendering();
-  if (typeof userDef === 'function') {
-    sharedPropertyDefinition.get = shouldCache
-      ? createComputedGetter(key)
-      : createGetterInvoker(userDef);
-    sharedPropertyDefinition.set = noop;
-  } else {
-    sharedPropertyDefinition.get = userDef.get
-      ? shouldCache && userDef.cache !== false
-        ? createComputedGetter(key)
-        : createGetterInvoker(userDef.get)
-      : noop;
-    sharedPropertyDefinition.set = userDef.set || noop;
-  }
-  if (sharedPropertyDefinition.set === noop) {
-    sharedPropertyDefinition.set = function () {
-      warn(
-        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
-        this
-      );
-    };
-  }
-  Object.defineProperty(target, key, sharedPropertyDefinition);
-}
+/*  */
 
-function createComputedGetter (key) {
-  return function computedGetter () {
-    var watcher = this._computedWatchers && this._computedWatchers[key];
-    if (watcher) {
-      if (watcher.dirty) {
-        watcher.evaluate();
-      }
-      if (Dep.target) {
-        watcher.depend();
-      }
-      return watcher.value
-    }
+/*  */
+
+function initEvents (vm) {
+  vm._events = Object.create(null);
+  vm._hasHookEvent = false;
+  // init parent attached events
+  var listeners = vm.$options._parentListeners;
+  if (listeners) {
+    updateComponentListeners(vm, listeners);
   }
 }
 
-function createGetterInvoker(fn) {
-  return function computedGetter () {
-    return fn.call(this, this)
-  }
+var target;
+
+function add (event, fn) {
+  target.$on(event, fn);
 }
 
-function initMethods (vm, methods) {
-  var props = vm.$options.props;
-  for (var key in methods) {
-    {
-      if (typeof methods[key] !== 'function') {
-        warn(
-          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
-          "Did you reference the function correctly?",
-          vm
-        );
-      }
-      if (props && hasOwn(props, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a prop."),
-          vm
-        );
-      }
-      if ((key in vm) && isReserved(key)) {
-        warn(
-          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
-          "Avoid defining component methods that start with _ or $."
-        );
-      }
-    }
-    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
-  }
+function remove$1 (event, fn) {
+  target.$off(event, fn);
 }
 
-function initWatch (vm, watch) {
-  for (var key in watch) {
-    var handler = watch[key];
-    if (Array.isArray(handler)) {
-      for (var i = 0; i < handler.length; i++) {
-        createWatcher(vm, key, handler[i]);
-      }
-    } else {
-      createWatcher(vm, key, handler);
+function createOnceHandler (event, fn) {
+  var _target = target;
+  return function onceHandler () {
+    var res = fn.apply(null, arguments);
+    if (res !== null) {
+      _target.$off(event, onceHandler);
     }
   }
 }
 
-function createWatcher (
+function updateComponentListeners (
   vm,
-  expOrFn,
-  handler,
-  options
+  listeners,
+  oldListeners
 ) {
-  if (isPlainObject(handler)) {
-    options = handler;
-    handler = handler.handler;
-  }
-  if (typeof handler === 'string') {
-    handler = vm[handler];
-  }
-  return vm.$watch(expOrFn, handler, options)
+  target = vm;
+  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+  target = undefined;
 }
 
-function stateMixin (Vue) {
-  // flow somehow has problems with directly declared definition object
-  // when using Object.defineProperty, so we have to procedurally build up
-  // the object here.
-  var dataDef = {};
-  dataDef.get = function () { return this._data };
-  var propsDef = {};
-  propsDef.get = function () { return this._props };
-  {
-    dataDef.set = function () {
-      warn(
-        'Avoid replacing instance root $data. ' +
-        'Use nested data properties instead.',
-        this
-      );
-    };
-    propsDef.set = function () {
-      warn("$props is readonly.", this);
-    };
-  }
-  Object.defineProperty(Vue.prototype, '$data', dataDef);
-  Object.defineProperty(Vue.prototype, '$props', propsDef);
+function eventsMixin (Vue) {
+  var hookRE = /^hook:/;
+  Vue.prototype.$on = function (event, fn) {
+    var vm = this;
+    if (Array.isArray(event)) {
+      for (var i = 0, l = event.length; i < l; i++) {
+        vm.$on(event[i], fn);
+      }
+    } else {
+      (vm._events[event] || (vm._events[event] = [])).push(fn);
+      // optimize hook:event cost by using a boolean flag marked at registration
+      // instead of a hash lookup
+      if (hookRE.test(event)) {
+        vm._hasHookEvent = true;
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$set = set;
-  Vue.prototype.$delete = del;
+  Vue.prototype.$once = function (event, fn) {
+    var vm = this;
+    function on () {
+      vm.$off(event, on);
+      fn.apply(vm, arguments);
+    }
+    on.fn = fn;
+    vm.$on(event, on);
+    return vm
+  };
+
+  Vue.prototype.$off = function (event, fn) {
+    var vm = this;
+    // all
+    if (!arguments.length) {
+      vm._events = Object.create(null);
+      return vm
+    }
+    // array of events
+    if (Array.isArray(event)) {
+      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
+        vm.$off(event[i$1], fn);
+      }
+      return vm
+    }
+    // specific event
+    var cbs = vm._events[event];
+    if (!cbs) {
+      return vm
+    }
+    if (!fn) {
+      vm._events[event] = null;
+      return vm
+    }
+    // specific handler
+    var cb;
+    var i = cbs.length;
+    while (i--) {
+      cb = cbs[i];
+      if (cb === fn || cb.fn === fn) {
+        cbs.splice(i, 1);
+        break
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$watch = function (
-    expOrFn,
-    cb,
-    options
-  ) {
+  Vue.prototype.$emit = function (event) {
     var vm = this;
-    if (isPlainObject(cb)) {
-      return createWatcher(vm, expOrFn, cb, options)
-    }
-    options = options || {};
-    options.user = true;
-    var watcher = new Watcher(vm, expOrFn, cb, options);
-    if (options.immediate) {
-      try {
-        cb.call(vm, watcher.value);
-      } catch (error) {
-        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
+    {
+      var lowerCaseEvent = event.toLowerCase();
+      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+        tip(
+          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
+          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
+          "Note that HTML attributes are case-insensitive and you cannot use " +
+          "v-on to listen to camelCase events when using in-DOM templates. " +
+          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
+        );
       }
     }
-    return function unwatchFn () {
-      watcher.teardown();
+    var cbs = vm._events[event];
+    if (cbs) {
+      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+      var args = toArray(arguments, 1);
+      var info = "event handler for \"" + event + "\"";
+      for (var i = 0, l = cbs.length; i < l; i++) {
+        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+      }
     }
+    return vm
   };
 }
 
 /*  */
 
-function initProvide (vm) {
-  var provide = vm.$options.provide;
-  if (provide) {
-    vm._provided = typeof provide === 'function'
-      ? provide.call(vm)
-      : provide;
-  }
-}
+var activeInstance = null;
+var isUpdatingChildComponent = false;
 
-function initInjections (vm) {
-  var result = resolveInject(vm.$options.inject, vm);
-  if (result) {
-    toggleObserving(false);
-    Object.keys(result).forEach(function (key) {
-      /* istanbul ignore else */
-      {
-        defineReactive$$1(vm, key, result[key], function () {
-          warn(
-            "Avoid mutating an injected value directly since the changes will be " +
-            "overwritten whenever the provided component re-renders. " +
-            "injection being mutated: \"" + key + "\"",
-            vm
-          );
-        });
-      }
-    });
-    toggleObserving(true);
+function setActiveInstance(vm) {
+  var prevActiveInstance = activeInstance;
+  activeInstance = vm;
+  return function () {
+    activeInstance = prevActiveInstance;
   }
 }
 
-function resolveInject (inject, vm) {
-  if (inject) {
-    // inject is :any because flow is not smart enough to figure out cached
-    var result = Object.create(null);
-    var keys = hasSymbol
-      ? Reflect.ownKeys(inject)
-      : Object.keys(inject);
+function initLifecycle (vm) {
+  var options = vm.$options;
 
-    for (var i = 0; i < keys.length; i++) {
-      var key = keys[i];
-      // #6574 in case the inject object is observed...
-      if (key === '__ob__') { continue }
-      var provideKey = inject[key].from;
-      var source = vm;
-      while (source) {
-        if (source._provided && hasOwn(source._provided, provideKey)) {
-          result[key] = source._provided[provideKey];
-          break
-        }
-        source = source.$parent;
-      }
-      if (!source) {
-        if ('default' in inject[key]) {
-          var provideDefault = inject[key].default;
-          result[key] = typeof provideDefault === 'function'
-            ? provideDefault.call(vm)
-            : provideDefault;
-        } else {
-          warn(("Injection \"" + key + "\" not found"), vm);
-        }
-      }
+  // locate first non-abstract parent
+  var parent = options.parent;
+  if (parent && !options.abstract) {
+    while (parent.$options.abstract && parent.$parent) {
+      parent = parent.$parent;
     }
-    return result
+    parent.$children.push(vm);
   }
-}
-
-/*  */
 
-function normalizeScopedSlots (
-  slots,
-  normalSlots
-) {
-  var res;
-  if (!slots) {
-    res = {};
-  } else if (slots._normalized) {
-    return slots
-  } else {
-    res = {};
-    for (var key in slots) {
-      if (slots[key] && key[0] !== '$') {
-        res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-      }
-    }
-  }
-  // expose normal slots on scopedSlots
-  for (var key$1 in normalSlots) {
-    if (!(key$1 in res)) {
-      res[key$1] = proxyNormalSlot(normalSlots, key$1);
-    }
-  }
-  res._normalized = true;
-  res.$stable = slots ? slots.$stable : true;
-  return res
-}
+  vm.$parent = parent;
+  vm.$root = parent ? parent.$root : vm;
 
-function normalizeScopedSlot(normalSlots, key, fn) {
-  var normalized = function (scope) {
-    if ( scope === void 0 ) scope = {};
+  vm.$children = [];
+  vm.$refs = {};
 
-    var res = fn(scope);
-    return res && typeof res === 'object' && !Array.isArray(res)
-      ? [res] // single vnode
-      : normalizeChildren(res)
-  };
-  // proxy scoped slots on normal $slots
-  if (!hasOwn(normalSlots, key)) {
-    Object.defineProperty(normalSlots, key, {
-      get: normalized
-    });
-  }
-  return normalized
+  vm._watcher = null;
+  vm._inactive = null;
+  vm._directInactive = false;
+  vm._isMounted = false;
+  vm._isDestroyed = false;
+  vm._isBeingDestroyed = false;
 }
 
-function proxyNormalSlot(slots, key) {
-  return function () { return slots[key]; }
-}
+function lifecycleMixin (Vue) {
+  Vue.prototype._update = function (vnode, hydrating) {
+    var vm = this;
+    var prevEl = vm.$el;
+    var prevVnode = vm._vnode;
+    var restoreActiveInstance = setActiveInstance(vm);
+    vm._vnode = vnode;
+    // Vue.prototype.__patch__ is injected in entry points
+    // based on the rendering backend used.
+    if (!prevVnode) {
+      // initial render
+      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+    } else {
+      // updates
+      vm.$el = vm.__patch__(prevVnode, vnode);
+    }
+    restoreActiveInstance();
+    // update __vue__ reference
+    if (prevEl) {
+      prevEl.__vue__ = null;
+    }
+    if (vm.$el) {
+      vm.$el.__vue__ = vm;
+    }
+    // if parent is an HOC, update its $el as well
+    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+      vm.$parent.$el = vm.$el;
+    }
+    // updated hook is called by the scheduler to ensure that children are
+    // updated in a parent's updated hook.
+  };
 
-/*  */
+  Vue.prototype.$forceUpdate = function () {
+    var vm = this;
+    if (vm._watcher) {
+      vm._watcher.update();
+    }
+  };
 
-/**
- * Runtime helper for rendering v-for lists.
- */
-function renderList (
-  val,
-  render
-) {
-  var ret, i, l, keys, key;
-  if (Array.isArray(val) || typeof val === 'string') {
-    ret = new Array(val.length);
-    for (i = 0, l = val.length; i < l; i++) {
-      ret[i] = render(val[i], i);
+  Vue.prototype.$destroy = function () {
+    var vm = this;
+    if (vm._isBeingDestroyed) {
+      return
     }
-  } else if (typeof val === 'number') {
-    ret = new Array(val);
-    for (i = 0; i < val; i++) {
-      ret[i] = render(i + 1, i);
+    callHook(vm, 'beforeDestroy');
+    vm._isBeingDestroyed = true;
+    // remove self from parent
+    var parent = vm.$parent;
+    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+      remove(parent.$children, vm);
     }
-  } else if (isObject(val)) {
-    if (hasSymbol && val[Symbol.iterator]) {
-      ret = [];
-      var iterator = val[Symbol.iterator]();
-      var result = iterator.next();
-      while (!result.done) {
-        ret.push(render(result.value, ret.length));
-        result = iterator.next();
-      }
-    } else {
-      keys = Object.keys(val);
-      ret = new Array(keys.length);
-      for (i = 0, l = keys.length; i < l; i++) {
-        key = keys[i];
-        ret[i] = render(val[key], key, i);
-      }
+    // teardown watchers
+    if (vm._watcher) {
+      vm._watcher.teardown();
+    }
+    var i = vm._watchers.length;
+    while (i--) {
+      vm._watchers[i].teardown();
+    }
+    // remove reference from data ob
+    // frozen object may not have observer.
+    if (vm._data.__ob__) {
+      vm._data.__ob__.vmCount--;
+    }
+    // call the last hook...
+    vm._isDestroyed = true;
+    // invoke destroy hooks on current rendered tree
+    vm.__patch__(vm._vnode, null);
+    // fire destroyed hook
+    callHook(vm, 'destroyed');
+    // turn off all instance listeners.
+    vm.$off();
+    // remove __vue__ reference
+    if (vm.$el) {
+      vm.$el.__vue__ = null;
     }
-  }
-  if (!isDef(ret)) {
-    ret = [];
-  }
-  (ret)._isVList = true;
-  return ret
+    // release circular reference (#6759)
+    if (vm.$vnode) {
+      vm.$vnode.parent = null;
+    }
+  };
 }
 
-/*  */
-
-/**
- * Runtime helper for rendering <slot>
- */
-function renderSlot (
-  name,
-  fallback,
-  props,
-  bindObject
+function mountComponent (
+  vm,
+  el,
+  hydrating
 ) {
-  var scopedSlotFn = this.$scopedSlots[name];
-  var nodes;
-  if (scopedSlotFn) { // scoped slot
-    props = props || {};
-    if (bindObject) {
-      if (!isObject(bindObject)) {
+  vm.$el = el;
+  if (!vm.$options.render) {
+    vm.$options.render = createEmptyVNode;
+    {
+      /* istanbul ignore if */
+      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+        vm.$options.el || el) {
         warn(
-          'slot v-bind without argument expects an Object',
-          this
+          'You are using the runtime-only build of Vue where the template ' +
+          'compiler is not available. Either pre-compile the templates into ' +
+          'render functions, or use the compiler-included build.',
+          vm
+        );
+      } else {
+        warn(
+          'Failed to mount component: template or render function not defined.',
+          vm
         );
       }
-      props = extend(extend({}, bindObject), props);
     }
-    nodes = scopedSlotFn(props) || fallback;
-  } else {
-    nodes = this.$slots[name] || fallback;
   }
+  callHook(vm, 'beforeMount');
 
-  var target = props && props.slot;
-  if (target) {
-    return this.$createElement('template', { slot: target }, nodes)
-  } else {
-    return nodes
-  }
-}
+  var updateComponent;
+  /* istanbul ignore if */
+  if (config.performance && mark) {
+    updateComponent = function () {
+      var name = vm._name;
+      var id = vm._uid;
+      var startTag = "vue-perf-start:" + id;
+      var endTag = "vue-perf-end:" + id;
 
-/*  */
+      mark(startTag);
+      var vnode = vm._render();
+      mark(endTag);
+      measure(("vue " + name + " render"), startTag, endTag);
 
-/**
- * Runtime helper for resolving filters
- */
-function resolveFilter (id) {
-  return resolveAsset(this.$options, 'filters', id, true) || identity
-}
+      mark(startTag);
+      vm._update(vnode, hydrating);
+      mark(endTag);
+      measure(("vue " + name + " patch"), startTag, endTag);
+    };
+  } else {
+    updateComponent = function () {
+      vm._update(vm._render(), hydrating);
+    };
+  }
 
-/*  */
+  // we set this to vm._watcher inside the watcher's constructor
+  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+  // component's mounted hook), which relies on vm._watcher being already defined
+  new Watcher(vm, updateComponent, noop, {
+    before: function before () {
+      if (vm._isMounted && !vm._isDestroyed) {
+        callHook(vm, 'beforeUpdate');
+      }
+    }
+  }, true /* isRenderWatcher */);
+  hydrating = false;
 
-function isKeyNotMatch (expect, actual) {
-  if (Array.isArray(expect)) {
-    return expect.indexOf(actual) === -1
-  } else {
-    return expect !== actual
+  // manually mounted instance, call mounted on self
+  // mounted is called for render-created child components in its inserted hook
+  if (vm.$vnode == null) {
+    vm._isMounted = true;
+    callHook(vm, 'mounted');
   }
+  return vm
 }
 
-/**
- * Runtime helper for checking keyCodes from config.
- * exposed as Vue.prototype._k
- * passing in eventKeyName as last argument separately for backwards compat
- */
-function checkKeyCodes (
-  eventKeyCode,
-  key,
-  builtInKeyCode,
-  eventKeyName,
-  builtInKeyName
+function updateChildComponent (
+  vm,
+  propsData,
+  listeners,
+  parentVnode,
+  renderChildren
 ) {
-  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-    return isKeyNotMatch(builtInKeyName, eventKeyName)
-  } else if (mappedKeyCode) {
-    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-  } else if (eventKeyName) {
-    return hyphenate(eventKeyName) !== key
+  {
+    isUpdatingChildComponent = true;
   }
-}
-
-/*  */
 
-/**
- * Runtime helper for merging v-bind="object" into a VNode's data.
- */
-function bindObjectProps (
-  data,
-  tag,
-  value,
-  asProp,
-  isSync
-) {
-  if (value) {
-    if (!isObject(value)) {
-      warn(
-        'v-bind without argument expects an Object or Array value',
-        this
-      );
-    } else {
-      if (Array.isArray(value)) {
-        value = toObject(value);
-      }
-      var hash;
-      var loop = function ( key ) {
-        if (
-          key === 'class' ||
-          key === 'style' ||
-          isReservedAttribute(key)
-        ) {
-          hash = data;
-        } else {
-          var type = data.attrs && data.attrs.type;
-          hash = asProp || config.mustUseProp(tag, type, key)
-            ? data.domProps || (data.domProps = {})
-            : data.attrs || (data.attrs = {});
-        }
-        var camelizedKey = camelize(key);
-        if (!(key in hash) && !(camelizedKey in hash)) {
-          hash[key] = value[key];
+  // determine whether component has slot children
+  // we need to do this before overwriting $options._renderChildren.
 
-          if (isSync) {
-            var on = data.on || (data.on = {});
-            on[("update:" + camelizedKey)] = function ($event) {
-              value[key] = $event;
-            };
-          }
-        }
-      };
+  // check if there are dynamic scopedSlots (hand-written or compiled but with
+  // dynamic slot names). Static scoped slots compiled from template has the
+  // "$stable" marker.
+  var hasDynamicScopedSlot = !!(
+    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+  );
 
-      for (var key in value) loop( key );
-    }
-  }
-  return data
-}
+  // Any static slot children from the parent may have changed during parent's
+  // update. Dynamic scoped slots may also have changed. In such cases, a forced
+  // update is necessary to ensure correctness.
+  var needsForceUpdate = !!(
+    renderChildren ||               // has new static slots
+    vm.$options._renderChildren ||  // has old static slots
+    hasDynamicScopedSlot
+  );
 
-/*  */
+  vm.$options._parentVnode = parentVnode;
+  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
 
-/**
- * Runtime helper for rendering static trees.
- */
-function renderStatic (
-  index,
-  isInFor
-) {
-  var cached = this._staticTrees || (this._staticTrees = []);
-  var tree = cached[index];
-  // if has already-rendered static tree and not inside v-for,
-  // we can reuse the same tree.
-  if (tree && !isInFor) {
-    return tree
+  if (vm._vnode) { // update child tree's parent
+    vm._vnode.parent = parentVnode;
   }
-  // otherwise, render a fresh tree.
-  tree = cached[index] = this.$options.staticRenderFns[index].call(
-    this._renderProxy,
-    null,
-    this // for render fns generated for functional component templates
-  );
-  markStatic(tree, ("__static__" + index), false);
-  return tree
-}
+  vm.$options._renderChildren = renderChildren;
 
-/**
- * Runtime helper for v-once.
- * Effectively it means marking the node as static with a unique key.
- */
-function markOnce (
-  tree,
-  index,
-  key
-) {
-  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-  return tree
-}
+  // update $attrs and $listeners hash
+  // these are also reactive so they may trigger child update if the child
+  // used them during render
+  vm.$attrs = parentVnode.data.attrs || emptyObject;
+  vm.$listeners = listeners || emptyObject;
 
-function markStatic (
-  tree,
-  key,
-  isOnce
-) {
-  if (Array.isArray(tree)) {
-    for (var i = 0; i < tree.length; i++) {
-      if (tree[i] && typeof tree[i] !== 'string') {
-        markStaticNode(tree[i], (key + "_" + i), isOnce);
-      }
+  // update props
+  if (propsData && vm.$options.props) {
+    toggleObserving(false);
+    var props = vm._props;
+    var propKeys = vm.$options._propKeys || [];
+    for (var i = 0; i < propKeys.length; i++) {
+      var key = propKeys[i];
+      var propOptions = vm.$options.props; // wtf flow?
+      props[key] = validateProp(key, propOptions, propsData, vm);
     }
-  } else {
-    markStaticNode(tree, key, isOnce);
+    toggleObserving(true);
+    // keep a copy of raw propsData
+    vm.$options.propsData = propsData;
   }
-}
 
-function markStaticNode (node, key, isOnce) {
-  node.isStatic = true;
-  node.key = key;
-  node.isOnce = isOnce;
+  // update listeners
+  listeners = listeners || emptyObject;
+  var oldListeners = vm.$options._parentListeners;
+  vm.$options._parentListeners = listeners;
+  updateComponentListeners(vm, listeners, oldListeners);
+
+  // resolve slots + force update if has children
+  if (needsForceUpdate) {
+    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+    vm.$forceUpdate();
+  }
+
+  {
+    isUpdatingChildComponent = false;
+  }
 }
 
-/*  */
+function isInInactiveTree (vm) {
+  while (vm && (vm = vm.$parent)) {
+    if (vm._inactive) { return true }
+  }
+  return false
+}
 
-function bindObjectListeners (data, value) {
-  if (value) {
-    if (!isPlainObject(value)) {
-      warn(
-        'v-on without argument expects an Object value',
-        this
-      );
-    } else {
-      var on = data.on = data.on ? extend({}, data.on) : {};
-      for (var key in value) {
-        var existing = on[key];
-        var ours = value[key];
-        on[key] = existing ? [].concat(existing, ours) : ours;
-      }
+function activateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = false;
+    if (isInInactiveTree(vm)) {
+      return
     }
+  } else if (vm._directInactive) {
+    return
+  }
+  if (vm._inactive || vm._inactive === null) {
+    vm._inactive = false;
+    for (var i = 0; i < vm.$children.length; i++) {
+      activateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'activated');
   }
-  return data
 }
 
-/*  */
-
-function bindDynamicKeys (baseObj, values) {
-  for (var i = 0; i < values.length; i += 2) {
-    var key = values[i];
-    if (typeof key === 'string' && key) {
-      baseObj[values[i]] = values[i + 1];
-    } else if (key !== '' && key !== null) {
-      // null is a speical value for explicitly removing a binding
-      warn(
-        ("Invalid value for dynamic directive argument (expected string or null): " + key),
-        this
-      );
+function deactivateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = true;
+    if (isInInactiveTree(vm)) {
+      return
     }
   }
-  return baseObj
+  if (!vm._inactive) {
+    vm._inactive = true;
+    for (var i = 0; i < vm.$children.length; i++) {
+      deactivateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'deactivated');
+  }
 }
 
-// helper to dynamically append modifier runtime markers to event names.
-// ensure only append when value is already string, otherwise it will be cast
-// to string and cause the type check to miss.
-function prependModifier (value, symbol) {
-  return typeof value === 'string' ? symbol + value : value
+function callHook (vm, hook) {
+  // #7573 disable dep collection when invoking lifecycle hooks
+  pushTarget();
+  var handlers = vm.$options[hook];
+  var info = hook + " hook";
+  if (handlers) {
+    for (var i = 0, j = handlers.length; i < j; i++) {
+      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+    }
+  }
+  if (vm._hasHookEvent) {
+    vm.$emit('hook:' + hook);
+  }
+  popTarget();
 }
 
 /*  */
 
-function installRenderHelpers (target) {
-  target._o = markOnce;
-  target._n = toNumber;
-  target._s = toString;
-  target._l = renderList;
-  target._t = renderSlot;
-  target._q = looseEqual;
-  target._i = looseIndexOf;
-  target._m = renderStatic;
-  target._f = resolveFilter;
-  target._k = checkKeyCodes;
-  target._b = bindObjectProps;
-  target._v = createTextVNode;
-  target._e = createEmptyVNode;
-  target._u = resolveScopedSlots;
-  target._g = bindObjectListeners;
-  target._d = bindDynamicKeys;
-  target._p = prependModifier;
-}
+var MAX_UPDATE_COUNT = 100;
 
-/*  */
+var queue = [];
+var activatedChildren = [];
+var has = {};
+var circular = {};
+var waiting = false;
+var flushing = false;
+var index = 0;
 
-function FunctionalRenderContext (
-  data,
-  props,
-  children,
-  parent,
-  Ctor
-) {
-  var options = Ctor.options;
-  // ensure the createElement function in functional components
-  // gets a unique context - this is necessary for correct named slot check
-  var contextVm;
-  if (hasOwn(parent, '_uid')) {
-    contextVm = Object.create(parent);
-    // $flow-disable-line
-    contextVm._original = parent;
-  } else {
-    // the context vm passed in is a functional context as well.
-    // in this case we want to make sure we are able to get a hold to the
-    // real context instance.
-    contextVm = parent;
-    // $flow-disable-line
-    parent = parent._original;
+/**
+ * Reset the scheduler's state.
+ */
+function resetSchedulerState () {
+  index = queue.length = activatedChildren.length = 0;
+  has = {};
+  {
+    circular = {};
   }
-  var isCompiled = isTrue(options._compiled);
-  var needNormalization = !isCompiled;
+  waiting = flushing = false;
+}
 
-  this.data = data;
-  this.props = props;
-  this.children = children;
-  this.parent = parent;
-  this.listeners = data.on || emptyObject;
-  this.injections = resolveInject(options.inject, parent);
-  this.slots = function () { return resolveSlots(children, parent); };
+// Async edge case #6566 requires saving the timestamp when event listeners are
+// attached. However, calling performance.now() has a perf overhead especially
+// if the page has thousands of event listeners. Instead, we take a timestamp
+// every time the scheduler flushes and use that for all event listeners
+// attached during that flush.
+var currentFlushTimestamp = 0;
 
-  Object.defineProperty(this, 'scopedSlots', ({
-    enumerable: true,
-    get: function get () {
-      return normalizeScopedSlots(data.scopedSlots, this.slots())
-    }
-  }));
+// Async edge case fix requires storing an event listener's attach timestamp.
+var getNow = Date.now;
 
-  // support for compiled functional template
-  if (isCompiled) {
-    // exposing $options for renderStatic()
-    this.$options = options;
-    // pre-resolve slots for renderSlot()
-    this.$slots = this.slots();
-    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
-  }
+// Determine what event timestamp the browser is using. Annoyingly, the
+// timestamp can either be hi-res (relative to page load) or low-res
+// (relative to UNIX epoch), so in order to compare time we have to use the
+// same timestamp type when saving the flush timestamp.
+if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+  // if the low-res timestamp which is bigger than the event timestamp
+  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+  // and we need to use the hi-res version for event listeners as well.
+  getNow = function () { return performance.now(); };
+}
 
-  if (options._scopeId) {
-    this._c = function (a, b, c, d) {
-      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
-      if (vnode && !Array.isArray(vnode)) {
-        vnode.fnScopeId = options._scopeId;
-        vnode.fnContext = parent;
+/**
+ * Flush both queues and run the watchers.
+ */
+function flushSchedulerQueue () {
+  currentFlushTimestamp = getNow();
+  flushing = true;
+  var watcher, id;
+
+  // Sort queue before flush.
+  // This ensures that:
+  // 1. Components are updated from parent to child. (because parent is always
+  //    created before the child)
+  // 2. A component's user watchers are run before its render watcher (because
+  //    user watchers are created before the render watcher)
+  // 3. If a component is destroyed during a parent component's watcher run,
+  //    its watchers can be skipped.
+  queue.sort(function (a, b) { return a.id - b.id; });
+
+  // do not cache length because more watchers might be pushed
+  // as we run existing watchers
+  for (index = 0; index < queue.length; index++) {
+    watcher = queue[index];
+    if (watcher.before) {
+      watcher.before();
+    }
+    id = watcher.id;
+    has[id] = null;
+    watcher.run();
+    // in dev build, check and stop circular updates.
+    if (has[id] != null) {
+      circular[id] = (circular[id] || 0) + 1;
+      if (circular[id] > MAX_UPDATE_COUNT) {
+        warn(
+          'You may have an infinite update loop ' + (
+            watcher.user
+              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
+              : "in a component render function."
+          ),
+          watcher.vm
+        );
+        break
       }
-      return vnode
-    };
-  } else {
-    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
+    }
   }
-}
 
-installRenderHelpers(FunctionalRenderContext.prototype);
+  // keep copies of post queues before resetting state
+  var activatedQueue = activatedChildren.slice();
+  var updatedQueue = queue.slice();
 
-function createFunctionalComponent (
-  Ctor,
-  propsData,
-  data,
-  contextVm,
-  children
-) {
-  var options = Ctor.options;
-  var props = {};
-  var propOptions = options.props;
-  if (isDef(propOptions)) {
-    for (var key in propOptions) {
-      props[key] = validateProp(key, propOptions, propsData || emptyObject);
-    }
-  } else {
-    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
-    if (isDef(data.props)) { mergeProps(props, data.props); }
-  }
+  resetSchedulerState();
 
-  var renderContext = new FunctionalRenderContext(
-    data,
-    props,
-    children,
-    contextVm,
-    Ctor
-  );
+  // call component updated and activated hooks
+  callActivatedHooks(activatedQueue);
+  callUpdatedHooks(updatedQueue);
 
-  var vnode = options.render.call(null, renderContext._c, renderContext);
+  // devtool hook
+  /* istanbul ignore if */
+  if (devtools && config.devtools) {
+    devtools.emit('flush');
+  }
+}
 
-  if (vnode instanceof VNode) {
-    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
-  } else if (Array.isArray(vnode)) {
-    var vnodes = normalizeChildren(vnode) || [];
-    var res = new Array(vnodes.length);
-    for (var i = 0; i < vnodes.length; i++) {
-      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+function callUpdatedHooks (queue) {
+  var i = queue.length;
+  while (i--) {
+    var watcher = queue[i];
+    var vm = watcher.vm;
+    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+      callHook(vm, 'updated');
     }
-    return res
   }
 }
 
-function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
-  // #7817 clone node before setting fnContext, otherwise if the node is reused
-  // (e.g. it was from a cached normal slot) the fnContext causes named slots
-  // that should not be matched to match.
-  var clone = cloneVNode(vnode);
-  clone.fnContext = contextVm;
-  clone.fnOptions = options;
-  {
-    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
-  }
-  if (data.slot) {
-    (clone.data || (clone.data = {})).slot = data.slot;
+/**
+ * Queue a kept-alive component that was activated during patch.
+ * The queue will be processed after the entire tree has been patched.
+ */
+function queueActivatedComponent (vm) {
+  // setting _inactive to false here so that a render function can
+  // rely on checking whether it's in an inactive tree (e.g. router-view)
+  vm._inactive = false;
+  activatedChildren.push(vm);
+}
+
+function callActivatedHooks (queue) {
+  for (var i = 0; i < queue.length; i++) {
+    queue[i]._inactive = true;
+    activateChildComponent(queue[i], true /* true */);
   }
-  return clone
 }
 
-function mergeProps (to, from) {
-  for (var key in from) {
-    to[camelize(key)] = from[key];
+/**
+ * Push a watcher into the watcher queue.
+ * Jobs with duplicate IDs will be skipped unless it's
+ * pushed when the queue is being flushed.
+ */
+function queueWatcher (watcher) {
+  var id = watcher.id;
+  if (has[id] == null) {
+    has[id] = true;
+    if (!flushing) {
+      queue.push(watcher);
+    } else {
+      // if already flushing, splice the watcher based on its id
+      // if already past its id, it will be run next immediately.
+      var i = queue.length - 1;
+      while (i > index && queue[i].id > watcher.id) {
+        i--;
+      }
+      queue.splice(i + 1, 0, watcher);
+    }
+    // queue the flush
+    if (!waiting) {
+      waiting = true;
+
+      if (!config.async) {
+        flushSchedulerQueue();
+        return
+      }
+      nextTick(flushSchedulerQueue);
+    }
   }
 }
 
 /*  */
 
-/*  */
 
-/*  */
 
-/*  */
+var uid$2 = 0;
 
-// inline hooks to be invoked on component VNodes during patch
-var componentVNodeHooks = {
-  init: function init (vnode, hydrating) {
-    if (
-      vnode.componentInstance &&
-      !vnode.componentInstance._isDestroyed &&
-      vnode.data.keepAlive
-    ) {
-      // kept-alive components, treat as a patch
-      var mountedNode = vnode; // work around flow
-      componentVNodeHooks.prepatch(mountedNode, mountedNode);
-    } else {
-      var child = vnode.componentInstance = createComponentInstanceForVnode(
-        vnode,
-        activeInstance
+/**
+ * A watcher parses an expression, collects dependencies,
+ * and fires callback when the expression value changes.
+ * This is used for both the $watch() api and directives.
+ */
+var Watcher = function Watcher (
+  vm,
+  expOrFn,
+  cb,
+  options,
+  isRenderWatcher
+) {
+  this.vm = vm;
+  if (isRenderWatcher) {
+    vm._watcher = this;
+  }
+  vm._watchers.push(this);
+  // options
+  if (options) {
+    this.deep = !!options.deep;
+    this.user = !!options.user;
+    this.lazy = !!options.lazy;
+    this.sync = !!options.sync;
+    this.before = options.before;
+  } else {
+    this.deep = this.user = this.lazy = this.sync = false;
+  }
+  this.cb = cb;
+  this.id = ++uid$2; // uid for batching
+  this.active = true;
+  this.dirty = this.lazy; // for lazy watchers
+  this.deps = [];
+  this.newDeps = [];
+  this.depIds = new _Set();
+  this.newDepIds = new _Set();
+  this.expression = expOrFn.toString();
+  // parse expression for getter
+  if (typeof expOrFn === 'function') {
+    this.getter = expOrFn;
+  } else {
+    this.getter = parsePath(expOrFn);
+    if (!this.getter) {
+      this.getter = noop;
+      warn(
+        "Failed watching path: \"" + expOrFn + "\" " +
+        'Watcher only accepts simple dot-delimited paths. ' +
+        'For full control, use a function instead.',
+        vm
       );
-      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
     }
-  },
-
-  prepatch: function prepatch (oldVnode, vnode) {
-    var options = vnode.componentOptions;
-    var child = vnode.componentInstance = oldVnode.componentInstance;
-    updateChildComponent(
-      child,
-      options.propsData, // updated props
-      options.listeners, // updated listeners
-      vnode, // new parent vnode
-      options.children // new children
-    );
-  },
+  }
+  this.value = this.lazy
+    ? undefined
+    : this.get();
+};
 
-  insert: function insert (vnode) {
-    var context = vnode.context;
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isMounted) {
-      componentInstance._isMounted = true;
-      callHook(componentInstance, 'mounted');
-    }
-    if (vnode.data.keepAlive) {
-      if (context._isMounted) {
-        // vue-router#1212
-        // During updates, a kept-alive component's child components may
-        // change, so directly walking the tree here may call activated hooks
-        // on incorrect children. Instead we push them into a queue which will
-        // be processed after the whole patch process ended.
-        queueActivatedComponent(componentInstance);
-      } else {
-        activateChildComponent(componentInstance, true /* direct */);
-      }
+/**
+ * Evaluate the getter, and re-collect dependencies.
+ */
+Watcher.prototype.get = function get () {
+  pushTarget(this);
+  var value;
+  var vm = this.vm;
+  try {
+    value = this.getter.call(vm, vm);
+  } catch (e) {
+    if (this.user) {
+      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+    } else {
+      throw e
     }
-  },
-
-  destroy: function destroy (vnode) {
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isDestroyed) {
-      if (!vnode.data.keepAlive) {
-        componentInstance.$destroy();
-      } else {
-        deactivateChildComponent(componentInstance, true /* direct */);
-      }
+  } finally {
+    // "touch" every property so they are all tracked as
+    // dependencies for deep watching
+    if (this.deep) {
+      traverse(value);
     }
+    popTarget();
+    this.cleanupDeps();
   }
+  return value
 };
 
-var hooksToMerge = Object.keys(componentVNodeHooks);
-
-function createComponent (
-  Ctor,
-  data,
-  context,
-  children,
-  tag
-) {
-  if (isUndef(Ctor)) {
-    return
-  }
-
-  var baseCtor = context.$options._base;
-
-  // plain options object: turn it into a constructor
-  if (isObject(Ctor)) {
-    Ctor = baseCtor.extend(Ctor);
-  }
-
-  // if at this stage it's not a constructor or an async component factory,
-  // reject.
-  if (typeof Ctor !== 'function') {
-    {
-      warn(("Invalid Component definition: " + (String(Ctor))), context);
+/**
+ * Add a dependency to this directive.
+ */
+Watcher.prototype.addDep = function addDep (dep) {
+  var id = dep.id;
+  if (!this.newDepIds.has(id)) {
+    this.newDepIds.add(id);
+    this.newDeps.push(dep);
+    if (!this.depIds.has(id)) {
+      dep.addSub(this);
     }
-    return
   }
+};
 
-  // async component
-  var asyncFactory;
-  if (isUndef(Ctor.cid)) {
-    asyncFactory = Ctor;
-    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
-    if (Ctor === undefined) {
-      // return a placeholder node for async component, which is rendered
-      // as a comment node but preserves all the raw information for the node.
-      // the information will be used for async server-rendering and hydration.
-      return createAsyncPlaceholder(
-        asyncFactory,
-        data,
-        context,
-        children,
-        tag
-      )
+/**
+ * Clean up for dependency collection.
+ */
+Watcher.prototype.cleanupDeps = function cleanupDeps () {
+  var i = this.deps.length;
+  while (i--) {
+    var dep = this.deps[i];
+    if (!this.newDepIds.has(dep.id)) {
+      dep.removeSub(this);
     }
   }
+  var tmp = this.depIds;
+  this.depIds = this.newDepIds;
+  this.newDepIds = tmp;
+  this.newDepIds.clear();
+  tmp = this.deps;
+  this.deps = this.newDeps;
+  this.newDeps = tmp;
+  this.newDeps.length = 0;
+};
 
-  data = data || {};
-
-  // resolve constructor options in case global mixins are applied after
-  // component constructor creation
-  resolveConstructorOptions(Ctor);
-
-  // transform component v-model data into props & events
-  if (isDef(data.model)) {
-    transformModel(Ctor.options, data);
-  }
-
-  // extract props
-  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
-
-  // functional component
-  if (isTrue(Ctor.options.functional)) {
-    return createFunctionalComponent(Ctor, propsData, data, context, children)
+/**
+ * Subscriber interface.
+ * Will be called when a dependency changes.
+ */
+Watcher.prototype.update = function update () {
+  /* istanbul ignore else */
+  if (this.lazy) {
+    this.dirty = true;
+  } else if (this.sync) {
+    this.run();
+  } else {
+    queueWatcher(this);
   }
+};
 
-  // extract listeners, since these needs to be treated as
-  // child component listeners instead of DOM listeners
-  var listeners = data.on;
-  // replace with listeners with .native modifier
-  // so it gets processed during parent component patch.
-  data.on = data.nativeOn;
-
-  if (isTrue(Ctor.options.abstract)) {
-    // abstract components do not keep anything
-    // other than props & listeners & slot
-
-    // work around flow
-    var slot = data.slot;
-    data = {};
-    if (slot) {
-      data.slot = slot;
+/**
+ * Scheduler job interface.
+ * Will be called by the scheduler.
+ */
+Watcher.prototype.run = function run () {
+  if (this.active) {
+    var value = this.get();
+    if (
+      value !== this.value ||
+      // Deep watchers and watchers on Object/Arrays should fire even
+      // when the value is the same, because the value may
+      // have mutated.
+      isObject(value) ||
+      this.deep
+    ) {
+      // set new value
+      var oldValue = this.value;
+      this.value = value;
+      if (this.user) {
+        try {
+          this.cb.call(this.vm, value, oldValue);
+        } catch (e) {
+          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
+        }
+      } else {
+        this.cb.call(this.vm, value, oldValue);
+      }
     }
   }
+};
 
-  // install component management hooks onto the placeholder node
-  installComponentHooks(data);
-
-  // return a placeholder vnode
-  var name = Ctor.options.name || tag;
-  var vnode = new VNode(
-    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
-    data, undefined, undefined, undefined, context,
-    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
-    asyncFactory
-  );
-
-  return vnode
-}
-
-function createComponentInstanceForVnode (
-  vnode, // we know it's MountedComponentVNode but flow doesn't
-  parent // activeInstance in lifecycle state
-) {
-  var options = {
-    _isComponent: true,
-    _parentVnode: vnode,
-    parent: parent
-  };
-  // check inline-template render functions
-  var inlineTemplate = vnode.data.inlineTemplate;
-  if (isDef(inlineTemplate)) {
-    options.render = inlineTemplate.render;
-    options.staticRenderFns = inlineTemplate.staticRenderFns;
-  }
-  return new vnode.componentOptions.Ctor(options)
-}
+/**
+ * Evaluate the value of the watcher.
+ * This only gets called for lazy watchers.
+ */
+Watcher.prototype.evaluate = function evaluate () {
+  this.value = this.get();
+  this.dirty = false;
+};
 
-function installComponentHooks (data) {
-  var hooks = data.hook || (data.hook = {});
-  for (var i = 0; i < hooksToMerge.length; i++) {
-    var key = hooksToMerge[i];
-    var existing = hooks[key];
-    var toMerge = componentVNodeHooks[key];
-    if (existing !== toMerge && !(existing && existing._merged)) {
-      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
-    }
+/**
+ * Depend on all deps collected by this watcher.
+ */
+Watcher.prototype.depend = function depend () {
+  var i = this.deps.length;
+  while (i--) {
+    this.deps[i].depend();
   }
-}
-
-function mergeHook$1 (f1, f2) {
-  var merged = function (a, b) {
-    // flow complains about extra args which is why we use any
-    f1(a, b);
-    f2(a, b);
-  };
-  merged._merged = true;
-  return merged
-}
+};
 
-// transform component v-model info (value and callback) into
-// prop and event handler respectively.
-function transformModel (options, data) {
-  var prop = (options.model && options.model.prop) || 'value';
-  var event = (options.model && options.model.event) || 'input'
-  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
-  var on = data.on || (data.on = {});
-  var existing = on[event];
-  var callback = data.model.callback;
-  if (isDef(existing)) {
-    if (
-      Array.isArray(existing)
-        ? existing.indexOf(callback) === -1
-        : existing !== callback
-    ) {
-      on[event] = [callback].concat(existing);
+/**
+ * Remove self from all dependencies' subscriber list.
+ */
+Watcher.prototype.teardown = function teardown () {
+  if (this.active) {
+    // remove self from vm's watcher list
+    // this is a somewhat expensive operation so we skip it
+    // if the vm is being destroyed.
+    if (!this.vm._isBeingDestroyed) {
+      remove(this.vm._watchers, this);
     }
-  } else {
-    on[event] = callback;
+    var i = this.deps.length;
+    while (i--) {
+      this.deps[i].removeSub(this);
+    }
+    this.active = false;
   }
-}
+};
 
 /*  */
 
-var SIMPLE_NORMALIZE = 1;
-var ALWAYS_NORMALIZE = 2;
+var sharedPropertyDefinition = {
+  enumerable: true,
+  configurable: true,
+  get: noop,
+  set: noop
+};
 
-// wrapper function for providing a more flexible interface
-// without getting yelled at by flow
-function createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType,
-  alwaysNormalize
-) {
-  if (Array.isArray(data) || isPrimitive(data)) {
-    normalizationType = children;
-    children = data;
-    data = undefined;
+function proxy (target, sourceKey, key) {
+  sharedPropertyDefinition.get = function proxyGetter () {
+    return this[sourceKey][key]
+  };
+  sharedPropertyDefinition.set = function proxySetter (val) {
+    this[sourceKey][key] = val;
+  };
+  Object.defineProperty(target, key, sharedPropertyDefinition);
+}
+
+function initState (vm) {
+  vm._watchers = [];
+  var opts = vm.$options;
+  if (opts.props) { initProps(vm, opts.props); }
+  if (opts.methods) { initMethods(vm, opts.methods); }
+  if (opts.data) {
+    initData(vm);
+  } else {
+    observe(vm._data = {}, true /* asRootData */);
   }
-  if (isTrue(alwaysNormalize)) {
-    normalizationType = ALWAYS_NORMALIZE;
+  if (opts.computed) { initComputed(vm, opts.computed); }
+  if (opts.watch && opts.watch !== nativeWatch) {
+    initWatch(vm, opts.watch);
   }
-  return _createElement(context, tag, data, children, normalizationType)
 }
 
-function _createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType
-) {
-  if (isDef(data) && isDef((data).__ob__)) {
+function initProps (vm, propsOptions) {
+  var propsData = vm.$options.propsData || {};
+  var props = vm._props = {};
+  // cache prop keys so that future props updates can iterate using Array
+  // instead of dynamic object key enumeration.
+  var keys = vm.$options._propKeys = [];
+  var isRoot = !vm.$parent;
+  // root instance props should be converted
+  if (!isRoot) {
+    toggleObserving(false);
+  }
+  var loop = function ( key ) {
+    keys.push(key);
+    var value = validateProp(key, propsOptions, propsData, vm);
+    /* istanbul ignore else */
+    {
+      var hyphenatedKey = hyphenate(key);
+      if (isReservedAttribute(hyphenatedKey) ||
+          config.isReservedAttr(hyphenatedKey)) {
+        warn(
+          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
+          vm
+        );
+      }
+      defineReactive$$1(props, key, value, function () {
+        if (!isRoot && !isUpdatingChildComponent) {
+          warn(
+            "Avoid mutating a prop directly since the value will be " +
+            "overwritten whenever the parent component re-renders. " +
+            "Instead, use a data or computed property based on the prop's " +
+            "value. Prop being mutated: \"" + key + "\"",
+            vm
+          );
+        }
+      });
+    }
+    // static props are already proxied on the component's prototype
+    // during Vue.extend(). We only need to proxy props defined at
+    // instantiation here.
+    if (!(key in vm)) {
+      proxy(vm, "_props", key);
+    }
+  };
+
+  for (var key in propsOptions) loop( key );
+  toggleObserving(true);
+}
+
+function initData (vm) {
+  var data = vm.$options.data;
+  data = vm._data = typeof data === 'function'
+    ? getData(data, vm)
+    : data || {};
+  if (!isPlainObject(data)) {
+    data = {};
     warn(
-      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-      'Always create fresh vnode data objects in each render!',
-      context
+      'data functions should return an object:\n' +
+      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+      vm
     );
-    return createEmptyVNode()
-  }
-  // object syntax in v-bind
-  if (isDef(data) && isDef(data.is)) {
-    tag = data.is;
-  }
-  if (!tag) {
-    // in case of component :is set to falsy value
-    return createEmptyVNode()
   }
-  // warn against non-primitive key
-  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-  ) {
+  // proxy data on instance
+  var keys = Object.keys(data);
+  var props = vm.$options.props;
+  var methods = vm.$options.methods;
+  var i = keys.length;
+  while (i--) {
+    var key = keys[i];
     {
+      if (methods && hasOwn(methods, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a data property."),
+          vm
+        );
+      }
+    }
+    if (props && hasOwn(props, key)) {
       warn(
-        'Avoid using non-primitive value as key, ' +
-        'use string/number value instead.',
-        context
+        "The data property \"" + key + "\" is already declared as a prop. " +
+        "Use prop default value instead.",
+        vm
       );
+    } else if (!isReserved(key)) {
+      proxy(vm, "_data", key);
     }
   }
-  // support single function children as default scoped slot
-  if (Array.isArray(children) &&
-    typeof children[0] === 'function'
-  ) {
-    data = data || {};
-    data.scopedSlots = { default: children[0] };
-    children.length = 0;
-  }
-  if (normalizationType === ALWAYS_NORMALIZE) {
-    children = normalizeChildren(children);
-  } else if (normalizationType === SIMPLE_NORMALIZE) {
-    children = simpleNormalizeChildren(children);
+  // observe data
+  observe(data, true /* asRootData */);
+}
+
+function getData (data, vm) {
+  // #7573 disable dep collection when invoking data getters
+  pushTarget();
+  try {
+    return data.call(vm, vm)
+  } catch (e) {
+    handleError(e, vm, "data()");
+    return {}
+  } finally {
+    popTarget();
   }
-  var vnode, ns;
-  if (typeof tag === 'string') {
-    var Ctor;
-    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-    if (config.isReservedTag(tag)) {
-      // platform built-in elements
-      vnode = new VNode(
-        config.parsePlatformTagName(tag), data, children,
-        undefined, undefined, context
+}
+
+var computedWatcherOptions = { lazy: true };
+
+function initComputed (vm, computed) {
+  // $flow-disable-line
+  var watchers = vm._computedWatchers = Object.create(null);
+  // computed properties are just getters during SSR
+  var isSSR = isServerRendering();
+
+  for (var key in computed) {
+    var userDef = computed[key];
+    var getter = typeof userDef === 'function' ? userDef : userDef.get;
+    if (getter == null) {
+      warn(
+        ("Getter is missing for computed property \"" + key + "\"."),
+        vm
       );
-    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-      // component
-      vnode = createComponent(Ctor, data, context, children, tag);
-    } else {
-      // unknown or unlisted namespaced elements
-      // check at runtime because it may get assigned a namespace when its
-      // parent normalizes children
-      vnode = new VNode(
-        tag, data, children,
-        undefined, undefined, context
+    }
+
+    if (!isSSR) {
+      // create internal watcher for the computed property.
+      watchers[key] = new Watcher(
+        vm,
+        getter || noop,
+        noop,
+        computedWatcherOptions
       );
     }
+
+    // component-defined computed properties are already defined on the
+    // component prototype. We only need to define computed properties defined
+    // at instantiation here.
+    if (!(key in vm)) {
+      defineComputed(vm, key, userDef);
+    } else {
+      if (key in vm.$data) {
+        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
+      } else if (vm.$options.props && key in vm.$options.props) {
+        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+      }
+    }
+  }
+}
+
+function defineComputed (
+  target,
+  key,
+  userDef
+) {
+  var shouldCache = !isServerRendering();
+  if (typeof userDef === 'function') {
+    sharedPropertyDefinition.get = shouldCache
+      ? createComputedGetter(key)
+      : createGetterInvoker(userDef);
+    sharedPropertyDefinition.set = noop;
   } else {
-    // direct component options / constructor
-    vnode = createComponent(tag, data, context, children);
+    sharedPropertyDefinition.get = userDef.get
+      ? shouldCache && userDef.cache !== false
+        ? createComputedGetter(key)
+        : createGetterInvoker(userDef.get)
+      : noop;
+    sharedPropertyDefinition.set = userDef.set || noop;
   }
-  if (Array.isArray(vnode)) {
-    return vnode
-  } else if (isDef(vnode)) {
-    if (isDef(ns)) { applyNS(vnode, ns); }
-    if (isDef(data)) { registerDeepBindings(data); }
-    return vnode
-  } else {
-    return createEmptyVNode()
+  if (sharedPropertyDefinition.set === noop) {
+    sharedPropertyDefinition.set = function () {
+      warn(
+        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
+        this
+      );
+    };
   }
+  Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
-function applyNS (vnode, ns, force) {
-  vnode.ns = ns;
-  if (vnode.tag === 'foreignObject') {
-    // use default namespace inside foreignObject
-    ns = undefined;
-    force = true;
-  }
-  if (isDef(vnode.children)) {
-    for (var i = 0, l = vnode.children.length; i < l; i++) {
-      var child = vnode.children[i];
-      if (isDef(child.tag) && (
-        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-        applyNS(child, ns, force);
+function createComputedGetter (key) {
+  return function computedGetter () {
+    var watcher = this._computedWatchers && this._computedWatchers[key];
+    if (watcher) {
+      if (watcher.dirty) {
+        watcher.evaluate();
       }
+      if (Dep.target) {
+        watcher.depend();
+      }
+      return watcher.value
     }
   }
 }
 
-// ref #5318
-// necessary to ensure parent re-render when deep bindings like :style and
-// :class are used on slot nodes
-function registerDeepBindings (data) {
-  if (isObject(data.style)) {
-    traverse(data.style);
-  }
-  if (isObject(data.class)) {
-    traverse(data.class);
+function createGetterInvoker(fn) {
+  return function computedGetter () {
+    return fn.call(this, this)
   }
 }
 
-/*  */
-
-function initRender (vm) {
-  vm._vnode = null; // the root of the child tree
-  vm._staticTrees = null; // v-once cached trees
-  var options = vm.$options;
-  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
-  var renderContext = parentVnode && parentVnode.context;
-  vm.$slots = resolveSlots(options._renderChildren, renderContext);
-  vm.$scopedSlots = emptyObject;
-  // bind the createElement fn to this instance
-  // so that we get proper render context inside it.
-  // args order: tag, data, children, normalizationType, alwaysNormalize
-  // internal version is used by render functions compiled from templates
-  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
-  // normalization is always applied for the public version, used in
-  // user-written render functions.
-  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+function initMethods (vm, methods) {
+  var props = vm.$options.props;
+  for (var key in methods) {
+    {
+      if (typeof methods[key] !== 'function') {
+        warn(
+          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
+          "Did you reference the function correctly?",
+          vm
+        );
+      }
+      if (props && hasOwn(props, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a prop."),
+          vm
+        );
+      }
+      if ((key in vm) && isReserved(key)) {
+        warn(
+          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
+          "Avoid defining component methods that start with _ or $."
+        );
+      }
+    }
+    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+  }
+}
 
-  // $attrs & $listeners are exposed for easier HOC creation.
-  // they need to be reactive so that HOCs using them are always updated
-  var parentData = parentVnode && parentVnode.data;
+function initWatch (vm, watch) {
+  for (var key in watch) {
+    var handler = watch[key];
+    if (Array.isArray(handler)) {
+      for (var i = 0; i < handler.length; i++) {
+        createWatcher(vm, key, handler[i]);
+      }
+    } else {
+      createWatcher(vm, key, handler);
+    }
+  }
+}
 
-  /* istanbul ignore else */
-  {
-    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
-    }, true);
-    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
-    }, true);
+function createWatcher (
+  vm,
+  expOrFn,
+  handler,
+  options
+) {
+  if (isPlainObject(handler)) {
+    options = handler;
+    handler = handler.handler;
+  }
+  if (typeof handler === 'string') {
+    handler = vm[handler];
   }
+  return vm.$watch(expOrFn, handler, options)
 }
 
-function renderMixin (Vue) {
-  // install runtime convenience helpers
-  installRenderHelpers(Vue.prototype);
+function stateMixin (Vue) {
+  // flow somehow has problems with directly declared definition object
+  // when using Object.defineProperty, so we have to procedurally build up
+  // the object here.
+  var dataDef = {};
+  dataDef.get = function () { return this._data };
+  var propsDef = {};
+  propsDef.get = function () { return this._props };
+  {
+    dataDef.set = function () {
+      warn(
+        'Avoid replacing instance root $data. ' +
+        'Use nested data properties instead.',
+        this
+      );
+    };
+    propsDef.set = function () {
+      warn("$props is readonly.", this);
+    };
+  }
+  Object.defineProperty(Vue.prototype, '$data', dataDef);
+  Object.defineProperty(Vue.prototype, '$props', propsDef);
 
-  Vue.prototype.$nextTick = function (fn) {
-    return nextTick(fn, this)
-  };
+  Vue.prototype.$set = set;
+  Vue.prototype.$delete = del;
 
-  Vue.prototype._render = function () {
+  Vue.prototype.$watch = function (
+    expOrFn,
+    cb,
+    options
+  ) {
     var vm = this;
-    var ref = vm.$options;
-    var render = ref.render;
-    var _parentVnode = ref._parentVnode;
-
-    if (_parentVnode) {
-      vm.$scopedSlots = normalizeScopedSlots(
-        _parentVnode.data.scopedSlots,
-        vm.$slots
-      );
+    if (isPlainObject(cb)) {
+      return createWatcher(vm, expOrFn, cb, options)
     }
-
-    // set parent vnode. this allows render functions to have access
-    // to the data on the placeholder node.
-    vm.$vnode = _parentVnode;
-    // render self
-    var vnode;
-    try {
-      vnode = render.call(vm._renderProxy, vm.$createElement);
-    } catch (e) {
-      handleError(e, vm, "render");
-      // return error render result,
-      // or previous vnode to prevent render error causing blank component
-      /* istanbul ignore else */
-      if (vm.$options.renderError) {
-        try {
-          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
-        } catch (e) {
-          handleError(e, vm, "renderError");
-          vnode = vm._vnode;
-        }
-      } else {
-        vnode = vm._vnode;
+    options = options || {};
+    options.user = true;
+    var watcher = new Watcher(vm, expOrFn, cb, options);
+    if (options.immediate) {
+      try {
+        cb.call(vm, watcher.value);
+      } catch (error) {
+        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
       }
     }
-    // if the returned array contains only a single node, allow it
-    if (Array.isArray(vnode) && vnode.length === 1) {
-      vnode = vnode[0];
-    }
-    // return empty vnode in case the render function errored out
-    if (!(vnode instanceof VNode)) {
-      if (Array.isArray(vnode)) {
-        warn(
-          'Multiple root nodes returned from render function. Render function ' +
-          'should return a single root node.',
-          vm
-        );
-      }
-      vnode = createEmptyVNode();
+    return function unwatchFn () {
+      watcher.teardown();
     }
-    // set parent
-    vnode.parent = _parentVnode;
-    return vnode
   };
 }
 
@@ -5328,7 +5331,7 @@ Object.defineProperty(Vue, 'FunctionalRenderContext', {
   value: FunctionalRenderContext
 });
 
-Vue.version = '2.6.2';
+Vue.version = '2.6.3';
 
 /*  */
 
@@ -7392,6 +7395,11 @@ function createOnceHandler$1 (event, handler, capture) {
   }
 }
 
+// #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+// implementation and does not fire microtasks in between event propagation, so
+// safe to exclude.
+var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
 function add$1 (
   name,
   handler,
@@ -7404,11 +7412,16 @@ function add$1 (
   // the solution is simple: we save the timestamp when a handler is attached,
   // and the handler would only fire if the event passed to it was fired
   // AFTER it was attached.
-  if (isUsingMicroTask) {
+  if (useMicrotaskFix) {
     var attachedTimestamp = currentFlushTimestamp;
     var original = handler;
     handler = original._wrapper = function (e) {
-      if (e.timeStamp >= attachedTimestamp) {
+      if (
+        e.timeStamp >= attachedTimestamp ||
+        // #9448 bail if event is fired in another document in a multi-page
+        // electron/nw.js app
+        e.target.ownerDocument !== document
+      ) {
         return original.apply(this, arguments)
       }
     };
@@ -9420,6 +9433,8 @@ var invalidAttributeRE = /[\s"'<>\/=]/;
 
 var decodeHTMLCached = cached(he.decode);
 
+var emptySlotScopeToken = "_empty_";
+
 // configurable state
 var warn$2;
 var delimiters;
@@ -10032,7 +10047,7 @@ function processSlotContent (el) {
         var dynamic = ref.dynamic;
         el.slotTarget = name;
         el.slotTargetDynamic = dynamic;
-        el.slotScope = slotBinding.value || "_"; // force it into a scoped slot for perf
+        el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
       }
     } else {
       // v-slot on component, denotes default slot
@@ -10067,8 +10082,13 @@ function processSlotContent (el) {
         var slotContainer = slots[name$1] = createASTElement('template', [], el);
         slotContainer.slotTarget = name$1;
         slotContainer.slotTargetDynamic = dynamic$1;
-        slotContainer.children = el.children.filter(function (c) { return !(c).slotScope; });
-        slotContainer.slotScope = slotBinding$1.value || "_";
+        slotContainer.children = el.children.filter(function (c) {
+          if (!c.slotScope) {
+            c.parent = slotContainer;
+            return true
+          }
+        });
+        slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
         // remove children as they are returned from scopedSlots now
         el.children = [];
         // mark el non-plain so data gets generated
@@ -10997,7 +11017,7 @@ function genData$2 (el, state) {
   }
   // scoped slots
   if (el.scopedSlots) {
-    data += (genScopedSlots(el.scopedSlots, state)) + ",";
+    data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
   }
   // component v-model
   if (el.model) {
@@ -11068,16 +11088,34 @@ function genInlineTemplate (el, state) {
 }
 
 function genScopedSlots (
+  el,
   slots,
   state
 ) {
-  var hasDynamicKeys = Object.keys(slots).some(function (key) {
+  // by default scoped slots are considered "stable", this allows child
+  // components with only scoped slots to skip forced updates from parent.
+  // but in some cases we have to bail-out of this optimization
+  // for example if the slot contains dynamic names, has v-if or v-for on them...
+  var needsForceUpdate = Object.keys(slots).some(function (key) {
     var slot = slots[key];
     return slot.slotTargetDynamic || slot.if || slot.for
   });
+  // OR when it is inside another scoped slot (the reactivity is disconnected)
+  // #9438
+  if (!needsForceUpdate) {
+    var parent = el.parent;
+    while (parent) {
+      if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+        needsForceUpdate = true;
+        break
+      }
+      parent = parent.parent;
+    }
+  }
+
   return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
       return genScopedSlot(slots[key], state)
-    }).join(',')) + "]" + (hasDynamicKeys ? ",true" : "") + ")")
+    }).join(',')) + "]" + (needsForceUpdate ? ",true" : "") + ")")
 }
 
 function genScopedSlot (
@@ -11091,7 +11129,10 @@ function genScopedSlot (
   if (el.for && !el.forProcessed) {
     return genFor(el, state, genScopedSlot)
   }
-  var fn = "function(" + (String(el.slotScope)) + "){" +
+  var slotScope = el.slotScope === emptySlotScopeToken
+    ? ""
+    : String(el.slotScope);
+  var fn = "function(" + slotScope + "){" +
     "return " + (el.tag === 'template'
       ? el.if && isLegacySyntax
         ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
@@ -11184,7 +11225,14 @@ function genSlot (el, state) {
   var slotName = el.slotName || '"default"';
   var children = genChildren(el, state);
   var res = "_t(" + slotName + (children ? ("," + children) : '');
-  var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
+  var attrs = el.attrs || el.dynamicAttrs
+    ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+        // slot props are camelized
+        name: camelize(attr.name),
+        value: attr.value,
+        dynamic: attr.dynamic
+      }); }))
+    : null;
   var bind$$1 = el.attrsMap['v-bind'];
   if ((attrs || bind$$1) && !children) {
     res += ",null";
diff --git a/dist/vue.common.prod.js b/dist/vue.common.prod.js
index 44e1c7f63c3..2c7c8c6b404 100644
--- a/dist/vue.common.prod.js
+++ b/dist/vue.common.prod.js
@@ -1,6 +1,6 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
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a=ja(e[o]);e[o]&&e[o].dynamic?i+=o+","+a+",":r+='"'+o+'":'+a+","}return r="{"+r.slice(0,-1)+"}",i?n+"_d("+r+",["+i.slice(0,-1)+"])":n+r}function ja(e){if(!e)return"function(){}";if(Array.isArray(e))return"["+e.map(function(e){return ja(e)}).join(",")+"]";var t=ka.test(e.value),n=xa.test(e.value),r=ka.test(e.value.replace(Aa,""));if(e.modifiers){var i="",o="",a=[];for(var s in e.modifiers)if(Ea[s])o+=Ea[s],Oa[s]&&a.push(s);else if("exact"===s){var c=e.modifiers;o+=Ta(["ctrl","shift","alt","meta"].filter(function(e){return!c[e]}).map(function(e){return"$event."+e+"Key"}).join("||"))}else a.push(s);return a.length&&(i+=function(e){return"if(('keyCode' in $event)&&"+e.map(La).join("&&")+")return null;"}(a)),o&&(i+=o),"function($event){"+i+(t?"return "+e.value+"($event)":n?"return ("+e.value+")($event)":r?"return "+e.value:e.value)+"}"}return t||n?e.value:"function($event){"+(r?"return "+e.value:e.value)+"}"}function La(e){var t=parseInt(e,10);if(t)return"$event.keyCode!=="+t;var n=Oa[e],r=Sa[e];return"_k($event.keyCode,"+JSON.stringify(e)+","+JSON.stringify(n)+",$event.key,"+JSON.stringify(r)+")"}var Ma={on:function(e,t){e.wrapListeners=function(e){return"_g("+e+","+t.value+")"}},bind:function(e,t){e.wrapData=function(n){return"_b("+n+",'"+e.tag+"',"+t.value+","+(t.modifiers&&t.modifiers.prop?"true":"false")+(t.modifiers&&t.modifiers.sync?",true":"")+")"}},cloak:S},Ia=function(e){this.options=e,this.warn=e.warn||kr,this.transforms=Or(e.modules,"transformCode"),this.dataGenFns=Or(e.modules,"genData"),this.directives=k(k({},Ma),e.directives);var t=e.isReservedTag||T;this.maybeComponent=function(e){return!!e.component||!t(e.tag)},this.onceId=0,this.staticRenderFns=[],this.pre=!1};function Da(e,t){var n=new Ia(t);return{render:"with(this){return "+(e?Pa(e,n):'_c("div")')+"}",staticRenderFns:n.staticRenderFns}}function Pa(e,t){if(e.parent&&(e.pre=e.pre||e.parent.pre),e.staticRoot&&!e.staticProcessed)return Ra(e,t);if(e.once&&!e.onceProcessed)return Fa(e,t);if(e.for&&!e.forProcessed)return Ba(e,t);if(e.if&&!e.ifProcessed)return Ha(e,t);if("template"!==e.tag||e.slotTarget||t.pre){if("slot"===e.tag)return function(e,t){var n=e.slotName||'"default"',r=Va(e,t),i="_t("+n+(r?","+r:""),o=e.attrs||e.dynamicAttrs?qa((e.attrs||[]).concat(e.dynamicAttrs||[]).map(function(e){return{name:b(e.name),value:e.value,dynamic:e.dynamic}})):null,a=e.attrsMap["v-bind"];!o&&!a||r||(i+=",null");o&&(i+=","+o);a&&(i+=(o?"":",null")+","+a);return i+")"}(e,t);var n;if(e.component)n=function(e,t,n){var r=t.inlineTemplate?null:Va(t,n,!0);return"_c("+e+","+Ua(t,n)+(r?","+r:"")+")"}(e.component,e,t);else{var r;(!e.plain||e.pre&&t.maybeComponent(e))&&(r=Ua(e,t));var i=e.inlineTemplate?null:Va(e,t,!0);n="_c('"+e.tag+"'"+(r?","+r:"")+(i?","+i:"")+")"}for(var o=0;o<t.transforms.length;o++)n=t.transforms[o](e,n);return n}return Va(e,t)||"void 0"}function Ra(e,t){e.staticProcessed=!0;var n=t.pre;return e.pre&&(t.pre=e.pre),t.staticRenderFns.push("with(this){return "+Pa(e,t)+"}"),t.pre=n,"_m("+(t.staticRenderFns.length-1)+(e.staticInFor?",true":"")+")"}function Fa(e,t){if(e.onceProcessed=!0,e.if&&!e.ifProcessed)return Ha(e,t);if(e.staticInFor){for(var n="",r=e.parent;r;){if(r.for){n=r.key;break}r=r.parent}return n?"_o("+Pa(e,t)+","+t.onceId+++","+n+")":Pa(e,t)}return Ra(e,t)}function Ha(e,t,n,r){return e.ifProcessed=!0,function e(t,n,r,i){if(!t.length)return i||"_e()";var o=t.shift();return o.exp?"("+o.exp+")?"+a(o.block)+":"+e(t,n,r,i):""+a(o.block);function a(e){return r?r(e,n):e.once?Fa(e,n):Pa(e,n)}}(e.ifConditions.slice(),t,n,r)}function Ba(e,t,n,r){var i=e.for,o=e.alias,a=e.iterator1?","+e.iterator1:"",s=e.iterator2?","+e.iterator2:"";return e.forProcessed=!0,(r||"_l")+"(("+i+"),function("+o+a+s+"){return "+(n||Pa)(e,t)+"})"}function Ua(e,t){var n="{",r=function(e,t){var n=e.directives;if(!n)return;var r,i,o,a,s="directives:[",c=!1;for(r=0,i=n.length;r<i;r++){o=n[r],a=!0;var u=t.directives[o.name];u&&(a=!!u(e,o,t.warn)),a&&(c=!0,s+='{name:"'+o.name+'",rawName:"'+o.rawName+'"'+(o.value?",value:("+o.value+"),expression:"+JSON.stringify(o.value):"")+(o.arg?",arg:"+(o.isDynamicArg?o.arg:'"'+o.arg+'"'):"")+(o.modifiers?",modifiers:"+JSON.stringify(o.modifiers):"")+"},")}if(c)return s.slice(0,-1)+"]"}(e,t);r&&(n+=r+","),e.key&&(n+="key:"+e.key+","),e.ref&&(n+="ref:"+e.ref+","),e.refInFor&&(n+="refInFor:true,"),e.pre&&(n+="pre:true,"),e.component&&(n+='tag:"'+e.tag+'",');for(var i=0;i<t.dataGenFns.length;i++)n+=t.dataGenFns[i](e);if(e.attrs&&(n+="attrs:"+qa(e.attrs)+","),e.props&&(n+="domProps:"+qa(e.props)+","),e.events&&(n+=Na(e.events,!1)+","),e.nativeEvents&&(n+=Na(e.nativeEvents,!0)+","),e.slotTarget&&!e.slotScope&&(n+="slot:"+e.slotTarget+","),e.scopedSlots&&(n+=function(e,t,n){var r=Object.keys(t).some(function(e){var n=t[e];return n.slotTargetDynamic||n.if||n.for});if(!r)for(var i=e.parent;i;){if(i.slotScope&&i.slotScope!==aa){r=!0;break}i=i.parent}return"scopedSlots:_u(["+Object.keys(t).map(function(e){return za(t[e],n)}).join(",")+"]"+(r?",true":"")+")"}(e,e.scopedSlots,t)+","),e.model&&(n+="model:{value:"+e.model.value+",callback:"+e.model.callback+",expression:"+e.model.expression+"},"),e.inlineTemplate){var o=function(e,t){var n=e.children[0];if(n&&1===n.type){var r=Da(n,t.options);return"inlineTemplate:{render:function(){"+r.render+"},staticRenderFns:["+r.staticRenderFns.map(function(e){return"function(){"+e+"}"}).join(",")+"]}"}}(e,t);o&&(n+=o+",")}return n=n.replace(/,$/,"")+"}",e.dynamicAttrs&&(n="_b("+n+',"'+e.tag+'",'+qa(e.dynamicAttrs)+")"),e.wrapData&&(n=e.wrapData(n)),e.wrapListeners&&(n=e.wrapListeners(n)),n}function za(e,t){var n=e.attrsMap["slot-scope"];if(e.if&&!e.ifProcessed&&!n)return Ha(e,t,za,"null");if(e.for&&!e.forProcessed)return Ba(e,t,za);var r="function("+(e.slotScope===aa?"":String(e.slotScope))+"){return "+("template"===e.tag?e.if&&n?"("+e.if+")?"+(Va(e,t)||"undefined")+":undefined":Va(e,t)||"undefined":Pa(e,t))+"}";return"{key:"+(e.slotTarget||'"default"')+",fn:"+r+"}"}function Va(e,t,n,r,i){var o=e.children;if(o.length){var a=o[0];if(1===o.length&&a.for&&"template"!==a.tag&&"slot"!==a.tag){var s=n?t.maybeComponent(a)?",1":",0":"";return""+(r||Pa)(a,t)+s}var c=n?function(e,t){for(var n=0,r=0;r<e.length;r++){var i=e[r];if(1===i.type){if(Ka(i)||i.ifConditions&&i.ifConditions.some(function(e){return Ka(e.block)})){n=2;break}(t(i)||i.ifConditions&&i.ifConditions.some(function(e){return t(e.block)}))&&(n=1)}}return n}(o,t.maybeComponent):0,u=i||Ja;return"["+o.map(function(e){return u(e,t)}).join(",")+"]"+(c?","+c:"")}}function Ka(e){return void 0!==e.for||"template"===e.tag||"slot"===e.tag}function Ja(e,t){return 1===e.type?Pa(e,t):3===e.type&&e.isComment?(r=e,"_e("+JSON.stringify(r.text)+")"):"_v("+(2===(n=e).type?n.expression:Wa(JSON.stringify(n.text)))+")";var n,r}function qa(e){for(var t="",n="",r=0;r<e.length;r++){var i=e[r],o=Wa(i.value);i.dynamic?n+=i.name+","+o+",":t+='"'+i.name+'":'+o+","}return t="{"+t.slice(0,-1)+"}",n?"_d("+t+",["+n.slice(0,-1)+"])":t}function Wa(e){return e.replace(/\u2028/g,"\\u2028").replace(/\u2029/g,"\\u2029")}new RegExp("\\b"+"do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,super,throw,while,yield,delete,export,import,return,switch,default,extends,finally,continue,debugger,function,arguments".split(",").join("\\b|\\b")+"\\b");function Za(e,t){try{return new Function(e)}catch(n){return t.push({err:n,code:e}),S}}function Ga(e){var t=Object.create(null);return function(n,r,i){(r=k({},r)).warn;delete r.warn;var o=r.delimiters?String(r.delimiters)+n:n;if(t[o])return t[o];var a=e(n,r),s={},c=[];return s.render=Za(a.render,c),s.staticRenderFns=a.staticRenderFns.map(function(e){return Za(e,c)}),t[o]=s}}var Xa,Ya,Qa=(Xa=function(e,t){var n=ca(e.trim(),t);!1!==t.optimize&&Ca(n,t);var r=Da(n,t);return{ast:n,render:r.render,staticRenderFns:r.staticRenderFns}},function(e){function t(t,n){var r=Object.create(e),i=[],o=[];if(n)for(var a in n.modules&&(r.modules=(e.modules||[]).concat(n.modules)),n.directives&&(r.directives=k(Object.create(e.directives||null),n.directives)),n)"modules"!==a&&"directives"!==a&&(r[a]=n[a]);r.warn=function(e,t,n){(n?o:i).push(e)};var s=Xa(t.trim(),r);return s.errors=i,s.tips=o,s}return{compile:t,compileToFunctions:Ga(t)}})($a),es=(Qa.compile,Qa.compileToFunctions);function ts(e){return(Ya=Ya||document.createElement("div")).innerHTML=e?'<a href="\n"/>':'<div a="\n"/>',Ya.innerHTML.indexOf("&#10;")>0}var ns=!!U&&ts(!1),rs=!!U&&ts(!0),is=g(function(e){var t=Gn(e);return t&&t.innerHTML}),os=bn.prototype.$mount;bn.prototype.$mount=function(e,t){if((e=e&&Gn(e))===document.body||e===document.documentElement)return this;var n=this.$options;if(!n.render){var r=n.template;if(r)if("string"==typeof r)"#"===r.charAt(0)&&(r=is(r));else{if(!r.nodeType)return this;r=r.innerHTML}else e&&(r=function(e){if(e.outerHTML)return e.outerHTML;var t=document.createElement("div");return t.appendChild(e.cloneNode(!0)),t.innerHTML}(e));if(r){var i=es(r,{outputSourceRange:!1,shouldDecodeNewlines:ns,shouldDecodeNewlinesForHref:rs,delimiters:n.delimiters,comments:n.comments},this),o=i.render,a=i.staticRenderFns;n.render=o,n.staticRenderFns=a}}return os.call(this,e,t)},bn.compile=es,module.exports=bn;
\ No newline at end of file
diff --git a/dist/vue.esm.browser.js b/dist/vue.esm.browser.js
index 83e124d4722..57fbf89cc63 100644
--- a/dist/vue.esm.browser.js
+++ b/dist/vue.esm.browser.js
@@ -1,5 +1,5 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
@@ -532,6 +532,7 @@ const isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'androi
 const isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
 const isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 const isPhantomJS = UA && /phantomjs/.test(UA);
+const isFF = UA && UA.match(/firefox\/(\d+)/);
 
 // Firefox has a "watch" function on Object.prototype...
 const nativeWatch = ({}).watch;
@@ -2432,2448 +2433,2452 @@ function normalizeArrayChildren (children, nestedIndex) {
 
 /*  */
 
-function ensureCtor (comp, base) {
-  if (
-    comp.__esModule ||
-    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-  ) {
-    comp = comp.default;
+function initProvide (vm) {
+  const provide = vm.$options.provide;
+  if (provide) {
+    vm._provided = typeof provide === 'function'
+      ? provide.call(vm)
+      : provide;
   }
-  return isObject(comp)
-    ? base.extend(comp)
-    : comp
-}
-
-function createAsyncPlaceholder (
-  factory,
-  data,
-  context,
-  children,
-  tag
-) {
-  const node = createEmptyVNode();
-  node.asyncFactory = factory;
-  node.asyncMeta = { data, context, children, tag };
-  return node
 }
 
-function resolveAsyncComponent (
-  factory,
-  baseCtor,
-  context
-) {
-  if (isTrue(factory.error) && isDef(factory.errorComp)) {
-    return factory.errorComp
-  }
-
-  if (isDef(factory.resolved)) {
-    return factory.resolved
-  }
-
-  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-    return factory.loadingComp
-  }
-
-  if (isDef(factory.contexts)) {
-    // already pending
-    factory.contexts.push(context);
-  } else {
-    const contexts = factory.contexts = [context];
-    let sync = true;
-
-    const forceRender = (renderCompleted) => {
-      for (let i = 0, l = contexts.length; i < l; i++) {
-        contexts[i].$forceUpdate();
-      }
-
-      if (renderCompleted) {
-        contexts.length = 0;
-      }
-    };
-
-    const resolve = once((res) => {
-      // cache resolved
-      factory.resolved = ensureCtor(res, baseCtor);
-      // invoke callbacks only if this is not a synchronous resolve
-      // (async resolves are shimmed as synchronous during SSR)
-      if (!sync) {
-        forceRender(true);
-      } else {
-        contexts.length = 0;
-      }
-    });
-
-    const reject = once(reason => {
-      warn(
-        `Failed to resolve async component: ${String(factory)}` +
-        (reason ? `\nReason: ${reason}` : '')
-      );
-      if (isDef(factory.errorComp)) {
-        factory.error = true;
-        forceRender(true);
+function initInjections (vm) {
+  const result = resolveInject(vm.$options.inject, vm);
+  if (result) {
+    toggleObserving(false);
+    Object.keys(result).forEach(key => {
+      /* istanbul ignore else */
+      {
+        defineReactive$$1(vm, key, result[key], () => {
+          warn(
+            `Avoid mutating an injected value directly since the changes will be ` +
+            `overwritten whenever the provided component re-renders. ` +
+            `injection being mutated: "${key}"`,
+            vm
+          );
+        });
       }
     });
+    toggleObserving(true);
+  }
+}
 
-    const res = factory(resolve, reject);
-
-    if (isObject(res)) {
-      if (isPromise(res)) {
-        // () => Promise
-        if (isUndef(factory.resolved)) {
-          res.then(resolve, reject);
-        }
-      } else if (isPromise(res.component)) {
-        res.component.then(resolve, reject);
-
-        if (isDef(res.error)) {
-          factory.errorComp = ensureCtor(res.error, baseCtor);
-        }
+function resolveInject (inject, vm) {
+  if (inject) {
+    // inject is :any because flow is not smart enough to figure out cached
+    const result = Object.create(null);
+    const keys = hasSymbol
+      ? Reflect.ownKeys(inject)
+      : Object.keys(inject);
 
-        if (isDef(res.loading)) {
-          factory.loadingComp = ensureCtor(res.loading, baseCtor);
-          if (res.delay === 0) {
-            factory.loading = true;
-          } else {
-            setTimeout(() => {
-              if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                factory.loading = true;
-                forceRender(false);
-              }
-            }, res.delay || 200);
-          }
+    for (let i = 0; i < keys.length; i++) {
+      const key = keys[i];
+      // #6574 in case the inject object is observed...
+      if (key === '__ob__') continue
+      const provideKey = inject[key].from;
+      let source = vm;
+      while (source) {
+        if (source._provided && hasOwn(source._provided, provideKey)) {
+          result[key] = source._provided[provideKey];
+          break
         }
-
-        if (isDef(res.timeout)) {
-          setTimeout(() => {
-            if (isUndef(factory.resolved)) {
-              reject(
-                `timeout (${res.timeout}ms)`
-              );
-            }
-          }, res.timeout);
+        source = source.$parent;
+      }
+      if (!source) {
+        if ('default' in inject[key]) {
+          const provideDefault = inject[key].default;
+          result[key] = typeof provideDefault === 'function'
+            ? provideDefault.call(vm)
+            : provideDefault;
+        } else {
+          warn(`Injection "${key}" not found`, vm);
         }
       }
     }
-
-    sync = false;
-    // return in case resolved synchronously
-    return factory.loading
-      ? factory.loadingComp
-      : factory.resolved
+    return result
   }
 }
 
 /*  */
 
-function isAsyncPlaceholder (node) {
-  return node.isComment && node.asyncFactory
-}
 
-/*  */
 
-function getFirstComponentChild (children) {
-  if (Array.isArray(children)) {
-    for (let i = 0; i < children.length; i++) {
-      const c = children[i];
-      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
-        return c
+/**
+ * Runtime helper for resolving raw children VNodes into a slot object.
+ */
+function resolveSlots (
+  children,
+  context
+) {
+  if (!children || !children.length) {
+    return {}
+  }
+  const slots = {};
+  for (let i = 0, l = children.length; i < l; i++) {
+    const child = children[i];
+    const data = child.data;
+    // remove slot attribute if the node is resolved as a Vue slot node
+    if (data && data.attrs && data.attrs.slot) {
+      delete data.attrs.slot;
+    }
+    // named slots should only be respected if the vnode was rendered in the
+    // same context.
+    if ((child.context === context || child.fnContext === context) &&
+      data && data.slot != null
+    ) {
+      const name = data.slot;
+      const slot = (slots[name] || (slots[name] = []));
+      if (child.tag === 'template') {
+        slot.push.apply(slot, child.children || []);
+      } else {
+        slot.push(child);
       }
+    } else {
+      (slots.default || (slots.default = [])).push(child);
+    }
+  }
+  // ignore slots that contains only whitespace
+  for (const name in slots) {
+    if (slots[name].every(isWhitespace)) {
+      delete slots[name];
     }
   }
+  return slots
 }
 
-/*  */
+function isWhitespace (node) {
+  return (node.isComment && !node.asyncFactory) || node.text === ' '
+}
 
 /*  */
 
-function initEvents (vm) {
-  vm._events = Object.create(null);
-  vm._hasHookEvent = false;
-  // init parent attached events
-  const listeners = vm.$options._parentListeners;
-  if (listeners) {
-    updateComponentListeners(vm, listeners);
+function normalizeScopedSlots (
+  slots,
+  normalSlots
+) {
+  let res;
+  if (!slots) {
+    res = {};
+  } else if (slots._normalized) {
+    return slots
+  } else {
+    res = {};
+    for (const key in slots) {
+      if (slots[key] && key[0] !== '$') {
+        res[key] = normalizeScopedSlot(slots[key]);
+      }
+    }
+  }
+  // expose normal slots on scopedSlots
+  for (const key in normalSlots) {
+    if (!(key in res)) {
+      res[key] = proxyNormalSlot(normalSlots, key);
+    }
   }
+  def(res, '_normalized', true);
+  def(res, '$stable', slots ? !!slots.$stable : true);
+  return res
 }
 
-let target;
-
-function add (event, fn) {
-  target.$on(event, fn);
+function normalizeScopedSlot(fn) {
+  return scope => {
+    const res = fn(scope);
+    return res && typeof res === 'object' && !Array.isArray(res)
+      ? [res] // single vnode
+      : normalizeChildren(res)
+  }
 }
 
-function remove$1 (event, fn) {
-  target.$off(event, fn);
+function proxyNormalSlot(slots, key) {
+  return () => slots[key]
 }
 
-function createOnceHandler (event, fn) {
-  const _target = target;
-  return function onceHandler () {
-    const res = fn.apply(null, arguments);
-    if (res !== null) {
-      _target.$off(event, onceHandler);
-    }
-  }
-}
+/*  */
 
-function updateComponentListeners (
-  vm,
-  listeners,
-  oldListeners
+/**
+ * Runtime helper for rendering v-for lists.
+ */
+function renderList (
+  val,
+  render
 ) {
-  target = vm;
-  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-  target = undefined;
-}
-
-function eventsMixin (Vue) {
-  const hookRE = /^hook:/;
-  Vue.prototype.$on = function (event, fn) {
-    const vm = this;
-    if (Array.isArray(event)) {
-      for (let i = 0, l = event.length; i < l; i++) {
-        vm.$on(event[i], fn);
-      }
-    } else {
-      (vm._events[event] || (vm._events[event] = [])).push(fn);
-      // optimize hook:event cost by using a boolean flag marked at registration
-      // instead of a hash lookup
-      if (hookRE.test(event)) {
-        vm._hasHookEvent = true;
-      }
-    }
-    return vm
-  };
-
-  Vue.prototype.$once = function (event, fn) {
-    const vm = this;
-    function on () {
-      vm.$off(event, on);
-      fn.apply(vm, arguments);
-    }
-    on.fn = fn;
-    vm.$on(event, on);
-    return vm
-  };
-
-  Vue.prototype.$off = function (event, fn) {
-    const vm = this;
-    // all
-    if (!arguments.length) {
-      vm._events = Object.create(null);
-      return vm
-    }
-    // array of events
-    if (Array.isArray(event)) {
-      for (let i = 0, l = event.length; i < l; i++) {
-        vm.$off(event[i], fn);
-      }
-      return vm
-    }
-    // specific event
-    const cbs = vm._events[event];
-    if (!cbs) {
-      return vm
-    }
-    if (!fn) {
-      vm._events[event] = null;
-      return vm
+  let ret, i, l, keys, key;
+  if (Array.isArray(val) || typeof val === 'string') {
+    ret = new Array(val.length);
+    for (i = 0, l = val.length; i < l; i++) {
+      ret[i] = render(val[i], i);
     }
-    // specific handler
-    let cb;
-    let i = cbs.length;
-    while (i--) {
-      cb = cbs[i];
-      if (cb === fn || cb.fn === fn) {
-        cbs.splice(i, 1);
-        break
-      }
+  } else if (typeof val === 'number') {
+    ret = new Array(val);
+    for (i = 0; i < val; i++) {
+      ret[i] = render(i + 1, i);
     }
-    return vm
-  };
-
-  Vue.prototype.$emit = function (event) {
-    const vm = this;
-    {
-      const lowerCaseEvent = event.toLowerCase();
-      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
-        tip(
-          `Event "${lowerCaseEvent}" is emitted in component ` +
-          `${formatComponentName(vm)} but the handler is registered for "${event}". ` +
-          `Note that HTML attributes are case-insensitive and you cannot use ` +
-          `v-on to listen to camelCase events when using in-DOM templates. ` +
-          `You should probably use "${hyphenate(event)}" instead of "${event}".`
-        );
+  } else if (isObject(val)) {
+    if (hasSymbol && val[Symbol.iterator]) {
+      ret = [];
+      const iterator = val[Symbol.iterator]();
+      let result = iterator.next();
+      while (!result.done) {
+        ret.push(render(result.value, ret.length));
+        result = iterator.next();
       }
-    }
-    let cbs = vm._events[event];
-    if (cbs) {
-      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
-      const args = toArray(arguments, 1);
-      const info = `event handler for "${event}"`;
-      for (let i = 0, l = cbs.length; i < l; i++) {
-        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+    } else {
+      keys = Object.keys(val);
+      ret = new Array(keys.length);
+      for (i = 0, l = keys.length; i < l; i++) {
+        key = keys[i];
+        ret[i] = render(val[key], key, i);
       }
     }
-    return vm
-  };
+  }
+  if (!isDef(ret)) {
+    ret = [];
+  }
+  (ret)._isVList = true;
+  return ret
 }
 
 /*  */
 
-
-
 /**
- * Runtime helper for resolving raw children VNodes into a slot object.
+ * Runtime helper for rendering <slot>
  */
-function resolveSlots (
-  children,
-  context
+function renderSlot (
+  name,
+  fallback,
+  props,
+  bindObject
 ) {
-  if (!children || !children.length) {
-    return {}
-  }
-  const slots = {};
-  for (let i = 0, l = children.length; i < l; i++) {
-    const child = children[i];
-    const data = child.data;
-    // remove slot attribute if the node is resolved as a Vue slot node
-    if (data && data.attrs && data.attrs.slot) {
-      delete data.attrs.slot;
-    }
-    // named slots should only be respected if the vnode was rendered in the
-    // same context.
-    if ((child.context === context || child.fnContext === context) &&
-      data && data.slot != null
-    ) {
-      const name = data.slot;
-      const slot = (slots[name] || (slots[name] = []));
-      if (child.tag === 'template') {
-        slot.push.apply(slot, child.children || []);
-      } else {
-        slot.push(child);
+  const scopedSlotFn = this.$scopedSlots[name];
+  let nodes;
+  if (scopedSlotFn) { // scoped slot
+    props = props || {};
+    if (bindObject) {
+      if (!isObject(bindObject)) {
+        warn(
+          'slot v-bind without argument expects an Object',
+          this
+        );
       }
-    } else {
-      (slots.default || (slots.default = [])).push(child);
-    }
-  }
-  // ignore slots that contains only whitespace
-  for (const name in slots) {
-    if (slots[name].every(isWhitespace)) {
-      delete slots[name];
+      props = extend(extend({}, bindObject), props);
     }
+    nodes = scopedSlotFn(props) || fallback;
+  } else {
+    nodes = this.$slots[name] || fallback;
   }
-  return slots
-}
-
-function isWhitespace (node) {
-  return (node.isComment && !node.asyncFactory) || node.text === ' '
-}
 
-function resolveScopedSlots (
-  fns, // see flow/vnode
-  hasDynamicKeys,
-  res
-) {
-  res = res || { $stable: !hasDynamicKeys };
-  for (let i = 0; i < fns.length; i++) {
-    const slot = fns[i];
-    if (Array.isArray(slot)) {
-      resolveScopedSlots(slot, hasDynamicKeys, res);
-    } else if (slot) {
-      res[slot.key] = slot.fn;
-    }
+  const target = props && props.slot;
+  if (target) {
+    return this.$createElement('template', { slot: target }, nodes)
+  } else {
+    return nodes
   }
-  return res
 }
 
 /*  */
 
-let activeInstance = null;
-let isUpdatingChildComponent = false;
-
-function setActiveInstance(vm) {
-  const prevActiveInstance = activeInstance;
-  activeInstance = vm;
-  return () => {
-    activeInstance = prevActiveInstance;
-  }
+/**
+ * Runtime helper for resolving filters
+ */
+function resolveFilter (id) {
+  return resolveAsset(this.$options, 'filters', id, true) || identity
 }
 
-function initLifecycle (vm) {
-  const options = vm.$options;
+/*  */
 
-  // locate first non-abstract parent
-  let parent = options.parent;
-  if (parent && !options.abstract) {
-    while (parent.$options.abstract && parent.$parent) {
-      parent = parent.$parent;
-    }
-    parent.$children.push(vm);
+function isKeyNotMatch (expect, actual) {
+  if (Array.isArray(expect)) {
+    return expect.indexOf(actual) === -1
+  } else {
+    return expect !== actual
   }
+}
 
-  vm.$parent = parent;
-  vm.$root = parent ? parent.$root : vm;
-
-  vm.$children = [];
-  vm.$refs = {};
-
-  vm._watcher = null;
-  vm._inactive = null;
-  vm._directInactive = false;
-  vm._isMounted = false;
-  vm._isDestroyed = false;
-  vm._isBeingDestroyed = false;
+/**
+ * Runtime helper for checking keyCodes from config.
+ * exposed as Vue.prototype._k
+ * passing in eventKeyName as last argument separately for backwards compat
+ */
+function checkKeyCodes (
+  eventKeyCode,
+  key,
+  builtInKeyCode,
+  eventKeyName,
+  builtInKeyName
+) {
+  const mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+    return isKeyNotMatch(builtInKeyName, eventKeyName)
+  } else if (mappedKeyCode) {
+    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+  } else if (eventKeyName) {
+    return hyphenate(eventKeyName) !== key
+  }
 }
 
-function lifecycleMixin (Vue) {
-  Vue.prototype._update = function (vnode, hydrating) {
-    const vm = this;
-    const prevEl = vm.$el;
-    const prevVnode = vm._vnode;
-    const restoreActiveInstance = setActiveInstance(vm);
-    vm._vnode = vnode;
-    // Vue.prototype.__patch__ is injected in entry points
-    // based on the rendering backend used.
-    if (!prevVnode) {
-      // initial render
-      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+/*  */
+
+/**
+ * Runtime helper for merging v-bind="object" into a VNode's data.
+ */
+function bindObjectProps (
+  data,
+  tag,
+  value,
+  asProp,
+  isSync
+) {
+  if (value) {
+    if (!isObject(value)) {
+      warn(
+        'v-bind without argument expects an Object or Array value',
+        this
+      );
     } else {
-      // updates
-      vm.$el = vm.__patch__(prevVnode, vnode);
-    }
-    restoreActiveInstance();
-    // update __vue__ reference
-    if (prevEl) {
-      prevEl.__vue__ = null;
-    }
-    if (vm.$el) {
-      vm.$el.__vue__ = vm;
-    }
-    // if parent is an HOC, update its $el as well
-    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
-      vm.$parent.$el = vm.$el;
-    }
-    // updated hook is called by the scheduler to ensure that children are
-    // updated in a parent's updated hook.
-  };
+      if (Array.isArray(value)) {
+        value = toObject(value);
+      }
+      let hash;
+      for (const key in value) {
+        if (
+          key === 'class' ||
+          key === 'style' ||
+          isReservedAttribute(key)
+        ) {
+          hash = data;
+        } else {
+          const type = data.attrs && data.attrs.type;
+          hash = asProp || config.mustUseProp(tag, type, key)
+            ? data.domProps || (data.domProps = {})
+            : data.attrs || (data.attrs = {});
+        }
+        const camelizedKey = camelize(key);
+        if (!(key in hash) && !(camelizedKey in hash)) {
+          hash[key] = value[key];
 
-  Vue.prototype.$forceUpdate = function () {
-    const vm = this;
-    if (vm._watcher) {
-      vm._watcher.update();
+          if (isSync) {
+            const on = data.on || (data.on = {});
+            on[`update:${camelizedKey}`] = function ($event) {
+              value[key] = $event;
+            };
+          }
+        }
+      }
     }
-  };
+  }
+  return data
+}
 
-  Vue.prototype.$destroy = function () {
-    const vm = this;
-    if (vm._isBeingDestroyed) {
-      return
-    }
-    callHook(vm, 'beforeDestroy');
-    vm._isBeingDestroyed = true;
-    // remove self from parent
-    const parent = vm.$parent;
-    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
-      remove(parent.$children, vm);
-    }
-    // teardown watchers
-    if (vm._watcher) {
-      vm._watcher.teardown();
-    }
-    let i = vm._watchers.length;
-    while (i--) {
-      vm._watchers[i].teardown();
-    }
-    // remove reference from data ob
-    // frozen object may not have observer.
-    if (vm._data.__ob__) {
-      vm._data.__ob__.vmCount--;
-    }
-    // call the last hook...
-    vm._isDestroyed = true;
-    // invoke destroy hooks on current rendered tree
-    vm.__patch__(vm._vnode, null);
-    // fire destroyed hook
-    callHook(vm, 'destroyed');
-    // turn off all instance listeners.
-    vm.$off();
-    // remove __vue__ reference
-    if (vm.$el) {
-      vm.$el.__vue__ = null;
-    }
-    // release circular reference (#6759)
-    if (vm.$vnode) {
-      vm.$vnode.parent = null;
-    }
-  };
+/*  */
+
+/**
+ * Runtime helper for rendering static trees.
+ */
+function renderStatic (
+  index,
+  isInFor
+) {
+  const cached = this._staticTrees || (this._staticTrees = []);
+  let tree = cached[index];
+  // if has already-rendered static tree and not inside v-for,
+  // we can reuse the same tree.
+  if (tree && !isInFor) {
+    return tree
+  }
+  // otherwise, render a fresh tree.
+  tree = cached[index] = this.$options.staticRenderFns[index].call(
+    this._renderProxy,
+    null,
+    this // for render fns generated for functional component templates
+  );
+  markStatic(tree, `__static__${index}`, false);
+  return tree
 }
 
-function mountComponent (
-  vm,
-  el,
-  hydrating
+/**
+ * Runtime helper for v-once.
+ * Effectively it means marking the node as static with a unique key.
+ */
+function markOnce (
+  tree,
+  index,
+  key
 ) {
-  vm.$el = el;
-  if (!vm.$options.render) {
-    vm.$options.render = createEmptyVNode;
-    {
-      /* istanbul ignore if */
-      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
-        vm.$options.el || el) {
-        warn(
-          'You are using the runtime-only build of Vue where the template ' +
-          'compiler is not available. Either pre-compile the templates into ' +
-          'render functions, or use the compiler-included build.',
-          vm
-        );
-      } else {
-        warn(
-          'Failed to mount component: template or render function not defined.',
-          vm
-        );
+  markStatic(tree, `__once__${index}${key ? `_${key}` : ``}`, true);
+  return tree
+}
+
+function markStatic (
+  tree,
+  key,
+  isOnce
+) {
+  if (Array.isArray(tree)) {
+    for (let i = 0; i < tree.length; i++) {
+      if (tree[i] && typeof tree[i] !== 'string') {
+        markStaticNode(tree[i], `${key}_${i}`, isOnce);
       }
     }
+  } else {
+    markStaticNode(tree, key, isOnce);
   }
-  callHook(vm, 'beforeMount');
+}
 
-  let updateComponent;
-  /* istanbul ignore if */
-  if (config.performance && mark) {
-    updateComponent = () => {
-      const name = vm._name;
-      const id = vm._uid;
-      const startTag = `vue-perf-start:${id}`;
-      const endTag = `vue-perf-end:${id}`;
+function markStaticNode (node, key, isOnce) {
+  node.isStatic = true;
+  node.key = key;
+  node.isOnce = isOnce;
+}
 
-      mark(startTag);
-      const vnode = vm._render();
-      mark(endTag);
-      measure(`vue ${name} render`, startTag, endTag);
+/*  */
 
-      mark(startTag);
-      vm._update(vnode, hydrating);
-      mark(endTag);
-      measure(`vue ${name} patch`, startTag, endTag);
-    };
-  } else {
-    updateComponent = () => {
-      vm._update(vm._render(), hydrating);
-    };
+function bindObjectListeners (data, value) {
+  if (value) {
+    if (!isPlainObject(value)) {
+      warn(
+        'v-on without argument expects an Object value',
+        this
+      );
+    } else {
+      const on = data.on = data.on ? extend({}, data.on) : {};
+      for (const key in value) {
+        const existing = on[key];
+        const ours = value[key];
+        on[key] = existing ? [].concat(existing, ours) : ours;
+      }
+    }
   }
+  return data
+}
 
-  // we set this to vm._watcher inside the watcher's constructor
-  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
-  // component's mounted hook), which relies on vm._watcher being already defined
-  new Watcher(vm, updateComponent, noop, {
-    before () {
-      if (vm._isMounted && !vm._isDestroyed) {
-        callHook(vm, 'beforeUpdate');
-      }
+/*  */
+
+function resolveScopedSlots (
+  fns, // see flow/vnode
+  hasDynamicKeys,
+  res
+) {
+  res = res || { $stable: !hasDynamicKeys };
+  for (let i = 0; i < fns.length; i++) {
+    const slot = fns[i];
+    if (Array.isArray(slot)) {
+      resolveScopedSlots(slot, hasDynamicKeys, res);
+    } else if (slot) {
+      res[slot.key] = slot.fn;
     }
-  }, true /* isRenderWatcher */);
-  hydrating = false;
+  }
+  return res
+}
 
-  // manually mounted instance, call mounted on self
-  // mounted is called for render-created child components in its inserted hook
-  if (vm.$vnode == null) {
-    vm._isMounted = true;
-    callHook(vm, 'mounted');
+/*  */
+
+function bindDynamicKeys (baseObj, values) {
+  for (let i = 0; i < values.length; i += 2) {
+    const key = values[i];
+    if (typeof key === 'string' && key) {
+      baseObj[values[i]] = values[i + 1];
+    } else if (key !== '' && key !== null) {
+      // null is a speical value for explicitly removing a binding
+      warn(
+        `Invalid value for dynamic directive argument (expected string or null): ${key}`,
+        this
+      );
+    }
   }
-  return vm
+  return baseObj
 }
 
-function updateChildComponent (
-  vm,
-  propsData,
-  listeners,
-  parentVnode,
-  renderChildren
+// helper to dynamically append modifier runtime markers to event names.
+// ensure only append when value is already string, otherwise it will be cast
+// to string and cause the type check to miss.
+function prependModifier (value, symbol) {
+  return typeof value === 'string' ? symbol + value : value
+}
+
+/*  */
+
+function installRenderHelpers (target) {
+  target._o = markOnce;
+  target._n = toNumber;
+  target._s = toString;
+  target._l = renderList;
+  target._t = renderSlot;
+  target._q = looseEqual;
+  target._i = looseIndexOf;
+  target._m = renderStatic;
+  target._f = resolveFilter;
+  target._k = checkKeyCodes;
+  target._b = bindObjectProps;
+  target._v = createTextVNode;
+  target._e = createEmptyVNode;
+  target._u = resolveScopedSlots;
+  target._g = bindObjectListeners;
+  target._d = bindDynamicKeys;
+  target._p = prependModifier;
+}
+
+/*  */
+
+function FunctionalRenderContext (
+  data,
+  props,
+  children,
+  parent,
+  Ctor
 ) {
-  {
-    isUpdatingChildComponent = true;
+  const options = Ctor.options;
+  // ensure the createElement function in functional components
+  // gets a unique context - this is necessary for correct named slot check
+  let contextVm;
+  if (hasOwn(parent, '_uid')) {
+    contextVm = Object.create(parent);
+    // $flow-disable-line
+    contextVm._original = parent;
+  } else {
+    // the context vm passed in is a functional context as well.
+    // in this case we want to make sure we are able to get a hold to the
+    // real context instance.
+    contextVm = parent;
+    // $flow-disable-line
+    parent = parent._original;
   }
+  const isCompiled = isTrue(options._compiled);
+  const needNormalization = !isCompiled;
 
-  // determine whether component has slot children
-  // we need to do this before overwriting $options._renderChildren.
+  this.data = data;
+  this.props = props;
+  this.children = children;
+  this.parent = parent;
+  this.listeners = data.on || emptyObject;
+  this.injections = resolveInject(options.inject, parent);
+  this.slots = () => resolveSlots(children, parent);
 
-  // check if there are dynamic scopedSlots (hand-written or compiled but with
-  // dynamic slot names). Static scoped slots compiled from template has the
-  // "$stable" marker.
-  const hasDynamicScopedSlot = !!(
-    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-  );
-  // Any static slot children from the parent may have changed during parent's
-  // update. Dynamic scoped slots may also have changed. In such cases, a forced
-  // update is necessary to ensure correctness.
-  const needsForceUpdate = !!(
-    renderChildren ||               // has new static slots
-    vm.$options._renderChildren ||  // has old static slots
-    hasDynamicScopedSlot
-  );
+  Object.defineProperty(this, 'scopedSlots', ({
+    enumerable: true,
+    get () {
+      return normalizeScopedSlots(data.scopedSlots, this.slots())
+    }
+  }));
 
-  vm.$options._parentVnode = parentVnode;
-  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+  // support for compiled functional template
+  if (isCompiled) {
+    // exposing $options for renderStatic()
+    this.$options = options;
+    // pre-resolve slots for renderSlot()
+    this.$slots = this.slots();
+    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
+  }
 
-  if (vm._vnode) { // update child tree's parent
-    vm._vnode.parent = parentVnode;
+  if (options._scopeId) {
+    this._c = (a, b, c, d) => {
+      const vnode = createElement(contextVm, a, b, c, d, needNormalization);
+      if (vnode && !Array.isArray(vnode)) {
+        vnode.fnScopeId = options._scopeId;
+        vnode.fnContext = parent;
+      }
+      return vnode
+    };
+  } else {
+    this._c = (a, b, c, d) => createElement(contextVm, a, b, c, d, needNormalization);
   }
-  vm.$options._renderChildren = renderChildren;
+}
 
-  // update $attrs and $listeners hash
-  // these are also reactive so they may trigger child update if the child
-  // used them during render
-  vm.$attrs = parentVnode.data.attrs || emptyObject;
-  vm.$listeners = listeners || emptyObject;
+installRenderHelpers(FunctionalRenderContext.prototype);
 
-  // update props
-  if (propsData && vm.$options.props) {
-    toggleObserving(false);
-    const props = vm._props;
-    const propKeys = vm.$options._propKeys || [];
-    for (let i = 0; i < propKeys.length; i++) {
-      const key = propKeys[i];
-      const propOptions = vm.$options.props; // wtf flow?
-      props[key] = validateProp(key, propOptions, propsData, vm);
+function createFunctionalComponent (
+  Ctor,
+  propsData,
+  data,
+  contextVm,
+  children
+) {
+  const options = Ctor.options;
+  const props = {};
+  const propOptions = options.props;
+  if (isDef(propOptions)) {
+    for (const key in propOptions) {
+      props[key] = validateProp(key, propOptions, propsData || emptyObject);
     }
-    toggleObserving(true);
-    // keep a copy of raw propsData
-    vm.$options.propsData = propsData;
+  } else {
+    if (isDef(data.attrs)) mergeProps(props, data.attrs);
+    if (isDef(data.props)) mergeProps(props, data.props);
   }
 
-  // update listeners
-  listeners = listeners || emptyObject;
-  const oldListeners = vm.$options._parentListeners;
-  vm.$options._parentListeners = listeners;
-  updateComponentListeners(vm, listeners, oldListeners);
+  const renderContext = new FunctionalRenderContext(
+    data,
+    props,
+    children,
+    contextVm,
+    Ctor
+  );
 
-  // resolve slots + force update if has children
-  if (needsForceUpdate) {
-    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-    vm.$forceUpdate();
+  const vnode = options.render.call(null, renderContext._c, renderContext);
+
+  if (vnode instanceof VNode) {
+    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+  } else if (Array.isArray(vnode)) {
+    const vnodes = normalizeChildren(vnode) || [];
+    const res = new Array(vnodes.length);
+    for (let i = 0; i < vnodes.length; i++) {
+      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+    }
+    return res
   }
+}
 
+function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+  // #7817 clone node before setting fnContext, otherwise if the node is reused
+  // (e.g. it was from a cached normal slot) the fnContext causes named slots
+  // that should not be matched to match.
+  const clone = cloneVNode(vnode);
+  clone.fnContext = contextVm;
+  clone.fnOptions = options;
   {
-    isUpdatingChildComponent = false;
+    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
   }
+  if (data.slot) {
+    (clone.data || (clone.data = {})).slot = data.slot;
+  }
+  return clone
 }
 
-function isInInactiveTree (vm) {
-  while (vm && (vm = vm.$parent)) {
-    if (vm._inactive) return true
+function mergeProps (to, from) {
+  for (const key in from) {
+    to[camelize(key)] = from[key];
   }
-  return false
 }
 
-function activateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = false;
-    if (isInInactiveTree(vm)) {
-      return
-    }
-  } else if (vm._directInactive) {
-    return
-  }
-  if (vm._inactive || vm._inactive === null) {
-    vm._inactive = false;
-    for (let i = 0; i < vm.$children.length; i++) {
-      activateChildComponent(vm.$children[i]);
+/*  */
+
+/*  */
+
+/*  */
+
+/*  */
+
+// inline hooks to be invoked on component VNodes during patch
+const componentVNodeHooks = {
+  init (vnode, hydrating) {
+    if (
+      vnode.componentInstance &&
+      !vnode.componentInstance._isDestroyed &&
+      vnode.data.keepAlive
+    ) {
+      // kept-alive components, treat as a patch
+      const mountedNode = vnode; // work around flow
+      componentVNodeHooks.prepatch(mountedNode, mountedNode);
+    } else {
+      const child = vnode.componentInstance = createComponentInstanceForVnode(
+        vnode,
+        activeInstance
+      );
+      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
     }
-    callHook(vm, 'activated');
-  }
-}
+  },
 
-function deactivateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = true;
-    if (isInInactiveTree(vm)) {
-      return
+  prepatch (oldVnode, vnode) {
+    const options = vnode.componentOptions;
+    const child = vnode.componentInstance = oldVnode.componentInstance;
+    updateChildComponent(
+      child,
+      options.propsData, // updated props
+      options.listeners, // updated listeners
+      vnode, // new parent vnode
+      options.children // new children
+    );
+  },
+
+  insert (vnode) {
+    const { context, componentInstance } = vnode;
+    if (!componentInstance._isMounted) {
+      componentInstance._isMounted = true;
+      callHook(componentInstance, 'mounted');
     }
-  }
-  if (!vm._inactive) {
-    vm._inactive = true;
-    for (let i = 0; i < vm.$children.length; i++) {
-      deactivateChildComponent(vm.$children[i]);
+    if (vnode.data.keepAlive) {
+      if (context._isMounted) {
+        // vue-router#1212
+        // During updates, a kept-alive component's child components may
+        // change, so directly walking the tree here may call activated hooks
+        // on incorrect children. Instead we push them into a queue which will
+        // be processed after the whole patch process ended.
+        queueActivatedComponent(componentInstance);
+      } else {
+        activateChildComponent(componentInstance, true /* direct */);
+      }
     }
-    callHook(vm, 'deactivated');
-  }
-}
+  },
 
-function callHook (vm, hook) {
-  // #7573 disable dep collection when invoking lifecycle hooks
-  pushTarget();
-  const handlers = vm.$options[hook];
-  const info = `${hook} hook`;
-  if (handlers) {
-    for (let i = 0, j = handlers.length; i < j; i++) {
-      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+  destroy (vnode) {
+    const { componentInstance } = vnode;
+    if (!componentInstance._isDestroyed) {
+      if (!vnode.data.keepAlive) {
+        componentInstance.$destroy();
+      } else {
+        deactivateChildComponent(componentInstance, true /* direct */);
+      }
     }
   }
-  if (vm._hasHookEvent) {
-    vm.$emit('hook:' + hook);
+};
+
+const hooksToMerge = Object.keys(componentVNodeHooks);
+
+function createComponent (
+  Ctor,
+  data,
+  context,
+  children,
+  tag
+) {
+  if (isUndef(Ctor)) {
+    return
   }
-  popTarget();
-}
 
-/*  */
+  const baseCtor = context.$options._base;
 
-const MAX_UPDATE_COUNT = 100;
+  // plain options object: turn it into a constructor
+  if (isObject(Ctor)) {
+    Ctor = baseCtor.extend(Ctor);
+  }
 
-const queue = [];
-const activatedChildren = [];
-let has = {};
-let circular = {};
-let waiting = false;
-let flushing = false;
-let index = 0;
+  // if at this stage it's not a constructor or an async component factory,
+  // reject.
+  if (typeof Ctor !== 'function') {
+    {
+      warn(`Invalid Component definition: ${String(Ctor)}`, context);
+    }
+    return
+  }
 
-/**
- * Reset the scheduler's state.
- */
-function resetSchedulerState () {
-  index = queue.length = activatedChildren.length = 0;
-  has = {};
-  {
-    circular = {};
+  // async component
+  let asyncFactory;
+  if (isUndef(Ctor.cid)) {
+    asyncFactory = Ctor;
+    Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+    if (Ctor === undefined) {
+      // return a placeholder node for async component, which is rendered
+      // as a comment node but preserves all the raw information for the node.
+      // the information will be used for async server-rendering and hydration.
+      return createAsyncPlaceholder(
+        asyncFactory,
+        data,
+        context,
+        children,
+        tag
+      )
+    }
   }
-  waiting = flushing = false;
-}
 
-// Async edge case #6566 requires saving the timestamp when event listeners are
-// attached. However, calling performance.now() has a perf overhead especially
-// if the page has thousands of event listeners. Instead, we take a timestamp
-// every time the scheduler flushes and use that for all event listeners
-// attached during that flush.
-let currentFlushTimestamp = 0;
+  data = data || {};
 
-// Async edge case fix requires storing an event listener's attach timestamp.
-let getNow = Date.now;
+  // resolve constructor options in case global mixins are applied after
+  // component constructor creation
+  resolveConstructorOptions(Ctor);
 
-// Determine what event timestamp the browser is using. Annoyingly, the
-// timestamp can either be hi-res ( relative to poge load) or low-res
-// (relative to UNIX epoch), so in order to compare time we have to use the
-// same timestamp type when saving the flush timestamp.
-if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-  // if the low-res timestamp which is bigger than the event timestamp
-  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-  // and we need to use the hi-res version for event listeners as well.
-  getNow = () => performance.now();
-}
+  // transform component v-model data into props & events
+  if (isDef(data.model)) {
+    transformModel(Ctor.options, data);
+  }
 
-/**
- * Flush both queues and run the watchers.
- */
-function flushSchedulerQueue () {
-  currentFlushTimestamp = getNow();
-  flushing = true;
-  let watcher, id;
+  // extract props
+  const propsData = extractPropsFromVNodeData(data, Ctor, tag);
 
-  // Sort queue before flush.
-  // This ensures that:
-  // 1. Components are updated from parent to child. (because parent is always
-  //    created before the child)
-  // 2. A component's user watchers are run before its render watcher (because
-  //    user watchers are created before the render watcher)
-  // 3. If a component is destroyed during a parent component's watcher run,
-  //    its watchers can be skipped.
-  queue.sort((a, b) => a.id - b.id);
+  // functional component
+  if (isTrue(Ctor.options.functional)) {
+    return createFunctionalComponent(Ctor, propsData, data, context, children)
+  }
 
-  // do not cache length because more watchers might be pushed
-  // as we run existing watchers
-  for (index = 0; index < queue.length; index++) {
-    watcher = queue[index];
-    if (watcher.before) {
-      watcher.before();
-    }
-    id = watcher.id;
-    has[id] = null;
-    watcher.run();
-    // in dev build, check and stop circular updates.
-    if (has[id] != null) {
-      circular[id] = (circular[id] || 0) + 1;
-      if (circular[id] > MAX_UPDATE_COUNT) {
-        warn(
-          'You may have an infinite update loop ' + (
-            watcher.user
-              ? `in watcher with expression "${watcher.expression}"`
-              : `in a component render function.`
-          ),
-          watcher.vm
-        );
-        break
-      }
+  // extract listeners, since these needs to be treated as
+  // child component listeners instead of DOM listeners
+  const listeners = data.on;
+  // replace with listeners with .native modifier
+  // so it gets processed during parent component patch.
+  data.on = data.nativeOn;
+
+  if (isTrue(Ctor.options.abstract)) {
+    // abstract components do not keep anything
+    // other than props & listeners & slot
+
+    // work around flow
+    const slot = data.slot;
+    data = {};
+    if (slot) {
+      data.slot = slot;
     }
   }
 
-  // keep copies of post queues before resetting state
-  const activatedQueue = activatedChildren.slice();
-  const updatedQueue = queue.slice();
+  // install component management hooks onto the placeholder node
+  installComponentHooks(data);
 
-  resetSchedulerState();
+  // return a placeholder vnode
+  const name = Ctor.options.name || tag;
+  const vnode = new VNode(
+    `vue-component-${Ctor.cid}${name ? `-${name}` : ''}`,
+    data, undefined, undefined, undefined, context,
+    { Ctor, propsData, listeners, tag, children },
+    asyncFactory
+  );
 
-  // call component updated and activated hooks
-  callActivatedHooks(activatedQueue);
-  callUpdatedHooks(updatedQueue);
+  return vnode
+}
 
-  // devtool hook
-  /* istanbul ignore if */
-  if (devtools && config.devtools) {
-    devtools.emit('flush');
+function createComponentInstanceForVnode (
+  vnode, // we know it's MountedComponentVNode but flow doesn't
+  parent, // activeInstance in lifecycle state
+) {
+  const options = {
+    _isComponent: true,
+    _parentVnode: vnode,
+    parent
+  };
+  // check inline-template render functions
+  const inlineTemplate = vnode.data.inlineTemplate;
+  if (isDef(inlineTemplate)) {
+    options.render = inlineTemplate.render;
+    options.staticRenderFns = inlineTemplate.staticRenderFns;
   }
+  return new vnode.componentOptions.Ctor(options)
 }
 
-function callUpdatedHooks (queue) {
-  let i = queue.length;
-  while (i--) {
-    const watcher = queue[i];
-    const vm = watcher.vm;
-    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
-      callHook(vm, 'updated');
+function installComponentHooks (data) {
+  const hooks = data.hook || (data.hook = {});
+  for (let i = 0; i < hooksToMerge.length; i++) {
+    const key = hooksToMerge[i];
+    const existing = hooks[key];
+    const toMerge = componentVNodeHooks[key];
+    if (existing !== toMerge && !(existing && existing._merged)) {
+      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
     }
   }
 }
 
-/**
- * Queue a kept-alive component that was activated during patch.
- * The queue will be processed after the entire tree has been patched.
- */
-function queueActivatedComponent (vm) {
-  // setting _inactive to false here so that a render function can
-  // rely on checking whether it's in an inactive tree (e.g. router-view)
-  vm._inactive = false;
-  activatedChildren.push(vm);
-}
-
-function callActivatedHooks (queue) {
-  for (let i = 0; i < queue.length; i++) {
-    queue[i]._inactive = true;
-    activateChildComponent(queue[i], true /* true */);
-  }
+function mergeHook$1 (f1, f2) {
+  const merged = (a, b) => {
+    // flow complains about extra args which is why we use any
+    f1(a, b);
+    f2(a, b);
+  };
+  merged._merged = true;
+  return merged
 }
 
-/**
- * Push a watcher into the watcher queue.
- * Jobs with duplicate IDs will be skipped unless it's
- * pushed when the queue is being flushed.
- */
-function queueWatcher (watcher) {
-  const id = watcher.id;
-  if (has[id] == null) {
-    has[id] = true;
-    if (!flushing) {
-      queue.push(watcher);
-    } else {
-      // if already flushing, splice the watcher based on its id
-      // if already past its id, it will be run next immediately.
-      let i = queue.length - 1;
-      while (i > index && queue[i].id > watcher.id) {
-        i--;
-      }
-      queue.splice(i + 1, 0, watcher);
-    }
-    // queue the flush
-    if (!waiting) {
-      waiting = true;
-
-      if (!config.async) {
-        flushSchedulerQueue();
-        return
-      }
-      nextTick(flushSchedulerQueue);
+// transform component v-model info (value and callback) into
+// prop and event handler respectively.
+function transformModel (options, data) {
+  const prop = (options.model && options.model.prop) || 'value';
+  const event = (options.model && options.model.event) || 'input'
+  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+  const on = data.on || (data.on = {});
+  const existing = on[event];
+  const callback = data.model.callback;
+  if (isDef(existing)) {
+    if (
+      Array.isArray(existing)
+        ? existing.indexOf(callback) === -1
+        : existing !== callback
+    ) {
+      on[event] = [callback].concat(existing);
     }
+  } else {
+    on[event] = callback;
   }
 }
 
 /*  */
 
+const SIMPLE_NORMALIZE = 1;
+const ALWAYS_NORMALIZE = 2;
 
-
-let uid$1 = 0;
-
-/**
- * A watcher parses an expression, collects dependencies,
- * and fires callback when the expression value changes.
- * This is used for both the $watch() api and directives.
- */
-class Watcher {
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-  
-
-  constructor (
-    vm,
-    expOrFn,
-    cb,
-    options,
-    isRenderWatcher
-  ) {
-    this.vm = vm;
-    if (isRenderWatcher) {
-      vm._watcher = this;
-    }
-    vm._watchers.push(this);
-    // options
-    if (options) {
-      this.deep = !!options.deep;
-      this.user = !!options.user;
-      this.lazy = !!options.lazy;
-      this.sync = !!options.sync;
-      this.before = options.before;
-    } else {
-      this.deep = this.user = this.lazy = this.sync = false;
-    }
-    this.cb = cb;
-    this.id = ++uid$1; // uid for batching
-    this.active = true;
-    this.dirty = this.lazy; // for lazy watchers
-    this.deps = [];
-    this.newDeps = [];
-    this.depIds = new _Set();
-    this.newDepIds = new _Set();
-    this.expression = expOrFn.toString();
-    // parse expression for getter
-    if (typeof expOrFn === 'function') {
-      this.getter = expOrFn;
-    } else {
-      this.getter = parsePath(expOrFn);
-      if (!this.getter) {
-        this.getter = noop;
-        warn(
-          `Failed watching path: "${expOrFn}" ` +
-          'Watcher only accepts simple dot-delimited paths. ' +
-          'For full control, use a function instead.',
-          vm
-        );
-      }
-    }
-    this.value = this.lazy
-      ? undefined
-      : this.get();
-  }
-
-  /**
-   * Evaluate the getter, and re-collect dependencies.
-   */
-  get () {
-    pushTarget(this);
-    let value;
-    const vm = this.vm;
-    try {
-      value = this.getter.call(vm, vm);
-    } catch (e) {
-      if (this.user) {
-        handleError(e, vm, `getter for watcher "${this.expression}"`);
-      } else {
-        throw e
-      }
-    } finally {
-      // "touch" every property so they are all tracked as
-      // dependencies for deep watching
-      if (this.deep) {
-        traverse(value);
-      }
-      popTarget();
-      this.cleanupDeps();
-    }
-    return value
+// wrapper function for providing a more flexible interface
+// without getting yelled at by flow
+function createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType,
+  alwaysNormalize
+) {
+  if (Array.isArray(data) || isPrimitive(data)) {
+    normalizationType = children;
+    children = data;
+    data = undefined;
   }
-
-  /**
-   * Add a dependency to this directive.
-   */
-  addDep (dep) {
-    const id = dep.id;
-    if (!this.newDepIds.has(id)) {
-      this.newDepIds.add(id);
-      this.newDeps.push(dep);
-      if (!this.depIds.has(id)) {
-        dep.addSub(this);
-      }
-    }
+  if (isTrue(alwaysNormalize)) {
+    normalizationType = ALWAYS_NORMALIZE;
   }
+  return _createElement(context, tag, data, children, normalizationType)
+}
 
-  /**
-   * Clean up for dependency collection.
-   */
-  cleanupDeps () {
-    let i = this.deps.length;
-    while (i--) {
-      const dep = this.deps[i];
-      if (!this.newDepIds.has(dep.id)) {
-        dep.removeSub(this);
-      }
+function _createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType
+) {
+  if (isDef(data) && isDef((data).__ob__)) {
+    warn(
+      `Avoid using observed data object as vnode data: ${JSON.stringify(data)}\n` +
+      'Always create fresh vnode data objects in each render!',
+      context
+    );
+    return createEmptyVNode()
+  }
+  // object syntax in v-bind
+  if (isDef(data) && isDef(data.is)) {
+    tag = data.is;
+  }
+  if (!tag) {
+    // in case of component :is set to falsy value
+    return createEmptyVNode()
+  }
+  // warn against non-primitive key
+  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+  ) {
+    {
+      warn(
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
+      );
     }
-    let tmp = this.depIds;
-    this.depIds = this.newDepIds;
-    this.newDepIds = tmp;
-    this.newDepIds.clear();
-    tmp = this.deps;
-    this.deps = this.newDeps;
-    this.newDeps = tmp;
-    this.newDeps.length = 0;
   }
-
-  /**
-   * Subscriber interface.
-   * Will be called when a dependency changes.
-   */
-  update () {
-    /* istanbul ignore else */
-    if (this.lazy) {
-      this.dirty = true;
-    } else if (this.sync) {
-      this.run();
+  // support single function children as default scoped slot
+  if (Array.isArray(children) &&
+    typeof children[0] === 'function'
+  ) {
+    data = data || {};
+    data.scopedSlots = { default: children[0] };
+    children.length = 0;
+  }
+  if (normalizationType === ALWAYS_NORMALIZE) {
+    children = normalizeChildren(children);
+  } else if (normalizationType === SIMPLE_NORMALIZE) {
+    children = simpleNormalizeChildren(children);
+  }
+  let vnode, ns;
+  if (typeof tag === 'string') {
+    let Ctor;
+    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+    if (config.isReservedTag(tag)) {
+      // platform built-in elements
+      vnode = new VNode(
+        config.parsePlatformTagName(tag), data, children,
+        undefined, undefined, context
+      );
+    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+      // component
+      vnode = createComponent(Ctor, data, context, children, tag);
     } else {
-      queueWatcher(this);
+      // unknown or unlisted namespaced elements
+      // check at runtime because it may get assigned a namespace when its
+      // parent normalizes children
+      vnode = new VNode(
+        tag, data, children,
+        undefined, undefined, context
+      );
     }
+  } else {
+    // direct component options / constructor
+    vnode = createComponent(tag, data, context, children);
+  }
+  if (Array.isArray(vnode)) {
+    return vnode
+  } else if (isDef(vnode)) {
+    if (isDef(ns)) applyNS(vnode, ns);
+    if (isDef(data)) registerDeepBindings(data);
+    return vnode
+  } else {
+    return createEmptyVNode()
   }
+}
 
-  /**
-   * Scheduler job interface.
-   * Will be called by the scheduler.
-   */
-  run () {
-    if (this.active) {
-      const value = this.get();
-      if (
-        value !== this.value ||
-        // Deep watchers and watchers on Object/Arrays should fire even
-        // when the value is the same, because the value may
-        // have mutated.
-        isObject(value) ||
-        this.deep
-      ) {
-        // set new value
-        const oldValue = this.value;
-        this.value = value;
-        if (this.user) {
-          try {
-            this.cb.call(this.vm, value, oldValue);
-          } catch (e) {
-            handleError(e, this.vm, `callback for watcher "${this.expression}"`);
-          }
-        } else {
-          this.cb.call(this.vm, value, oldValue);
-        }
+function applyNS (vnode, ns, force) {
+  vnode.ns = ns;
+  if (vnode.tag === 'foreignObject') {
+    // use default namespace inside foreignObject
+    ns = undefined;
+    force = true;
+  }
+  if (isDef(vnode.children)) {
+    for (let i = 0, l = vnode.children.length; i < l; i++) {
+      const child = vnode.children[i];
+      if (isDef(child.tag) && (
+        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+        applyNS(child, ns, force);
       }
     }
   }
+}
 
-  /**
-   * Evaluate the value of the watcher.
-   * This only gets called for lazy watchers.
-   */
-  evaluate () {
-    this.value = this.get();
-    this.dirty = false;
+// ref #5318
+// necessary to ensure parent re-render when deep bindings like :style and
+// :class are used on slot nodes
+function registerDeepBindings (data) {
+  if (isObject(data.style)) {
+    traverse(data.style);
+  }
+  if (isObject(data.class)) {
+    traverse(data.class);
   }
+}
 
-  /**
-   * Depend on all deps collected by this watcher.
-   */
-  depend () {
-    let i = this.deps.length;
-    while (i--) {
-      this.deps[i].depend();
-    }
+/*  */
+
+function initRender (vm) {
+  vm._vnode = null; // the root of the child tree
+  vm._staticTrees = null; // v-once cached trees
+  const options = vm.$options;
+  const parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+  const renderContext = parentVnode && parentVnode.context;
+  vm.$slots = resolveSlots(options._renderChildren, renderContext);
+  vm.$scopedSlots = emptyObject;
+  // bind the createElement fn to this instance
+  // so that we get proper render context inside it.
+  // args order: tag, data, children, normalizationType, alwaysNormalize
+  // internal version is used by render functions compiled from templates
+  vm._c = (a, b, c, d) => createElement(vm, a, b, c, d, false);
+  // normalization is always applied for the public version, used in
+  // user-written render functions.
+  vm.$createElement = (a, b, c, d) => createElement(vm, a, b, c, d, true);
+
+  // $attrs & $listeners are exposed for easier HOC creation.
+  // they need to be reactive so that HOCs using them are always updated
+  const parentData = parentVnode && parentVnode.data;
+
+  /* istanbul ignore else */
+  {
+    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, () => {
+      !isUpdatingChildComponent && warn(`$attrs is readonly.`, vm);
+    }, true);
+    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, () => {
+      !isUpdatingChildComponent && warn(`$listeners is readonly.`, vm);
+    }, true);
   }
+}
 
-  /**
-   * Remove self from all dependencies' subscriber list.
-   */
-  teardown () {
-    if (this.active) {
-      // remove self from vm's watcher list
-      // this is a somewhat expensive operation so we skip it
-      // if the vm is being destroyed.
-      if (!this.vm._isBeingDestroyed) {
-        remove(this.vm._watchers, this);
+let currentRenderingInstance = null;
+
+function renderMixin (Vue) {
+  // install runtime convenience helpers
+  installRenderHelpers(Vue.prototype);
+
+  Vue.prototype.$nextTick = function (fn) {
+    return nextTick(fn, this)
+  };
+
+  Vue.prototype._render = function () {
+    const vm = this;
+    const { render, _parentVnode } = vm.$options;
+
+    if (_parentVnode) {
+      vm.$scopedSlots = normalizeScopedSlots(
+        _parentVnode.data.scopedSlots,
+        vm.$slots
+      );
+    }
+
+    // set parent vnode. this allows render functions to have access
+    // to the data on the placeholder node.
+    vm.$vnode = _parentVnode;
+    // render self
+    let vnode;
+    try {
+      // There's no need to maintain a stack becaues all render fns are called
+      // separately from one another. Nested component's render fns are called
+      // when parent component is patched.
+      currentRenderingInstance = vm;
+      vnode = render.call(vm._renderProxy, vm.$createElement);
+    } catch (e) {
+      handleError(e, vm, `render`);
+      // return error render result,
+      // or previous vnode to prevent render error causing blank component
+      /* istanbul ignore else */
+      if (vm.$options.renderError) {
+        try {
+          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+        } catch (e) {
+          handleError(e, vm, `renderError`);
+          vnode = vm._vnode;
+        }
+      } else {
+        vnode = vm._vnode;
       }
-      let i = this.deps.length;
-      while (i--) {
-        this.deps[i].removeSub(this);
+    } finally {
+      currentRenderingInstance = null;
+    }
+    // if the returned array contains only a single node, allow it
+    if (Array.isArray(vnode) && vnode.length === 1) {
+      vnode = vnode[0];
+    }
+    // return empty vnode in case the render function errored out
+    if (!(vnode instanceof VNode)) {
+      if (Array.isArray(vnode)) {
+        warn(
+          'Multiple root nodes returned from render function. Render function ' +
+          'should return a single root node.',
+          vm
+        );
       }
-      this.active = false;
+      vnode = createEmptyVNode();
     }
-  }
+    // set parent
+    vnode.parent = _parentVnode;
+    return vnode
+  };
 }
 
 /*  */
 
-const sharedPropertyDefinition = {
-  enumerable: true,
-  configurable: true,
-  get: noop,
-  set: noop
-};
+function ensureCtor (comp, base) {
+  if (
+    comp.__esModule ||
+    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+  ) {
+    comp = comp.default;
+  }
+  return isObject(comp)
+    ? base.extend(comp)
+    : comp
+}
 
-function proxy (target, sourceKey, key) {
-  sharedPropertyDefinition.get = function proxyGetter () {
-    return this[sourceKey][key]
-  };
-  sharedPropertyDefinition.set = function proxySetter (val) {
-    this[sourceKey][key] = val;
-  };
-  Object.defineProperty(target, key, sharedPropertyDefinition);
+function createAsyncPlaceholder (
+  factory,
+  data,
+  context,
+  children,
+  tag
+) {
+  const node = createEmptyVNode();
+  node.asyncFactory = factory;
+  node.asyncMeta = { data, context, children, tag };
+  return node
 }
 
-function initState (vm) {
-  vm._watchers = [];
-  const opts = vm.$options;
-  if (opts.props) initProps(vm, opts.props);
-  if (opts.methods) initMethods(vm, opts.methods);
-  if (opts.data) {
-    initData(vm);
-  } else {
-    observe(vm._data = {}, true /* asRootData */);
+function resolveAsyncComponent (
+  factory,
+  baseCtor
+) {
+  if (isTrue(factory.error) && isDef(factory.errorComp)) {
+    return factory.errorComp
   }
-  if (opts.computed) initComputed(vm, opts.computed);
-  if (opts.watch && opts.watch !== nativeWatch) {
-    initWatch(vm, opts.watch);
+
+  if (isDef(factory.resolved)) {
+    return factory.resolved
   }
-}
 
-function initProps (vm, propsOptions) {
-  const propsData = vm.$options.propsData || {};
-  const props = vm._props = {};
-  // cache prop keys so that future props updates can iterate using Array
-  // instead of dynamic object key enumeration.
-  const keys = vm.$options._propKeys = [];
-  const isRoot = !vm.$parent;
-  // root instance props should be converted
-  if (!isRoot) {
-    toggleObserving(false);
+  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+    return factory.loadingComp
   }
-  for (const key in propsOptions) {
-    keys.push(key);
-    const value = validateProp(key, propsOptions, propsData, vm);
-    /* istanbul ignore else */
-    {
-      const hyphenatedKey = hyphenate(key);
-      if (isReservedAttribute(hyphenatedKey) ||
-          config.isReservedAttr(hyphenatedKey)) {
-        warn(
-          `"${hyphenatedKey}" is a reserved attribute and cannot be used as component prop.`,
-          vm
-        );
+
+  const owner = currentRenderingInstance;
+  if (isDef(factory.owners)) {
+    // already pending
+    factory.owners.push(owner);
+  } else {
+    const owners = factory.owners = [owner];
+    let sync = true;
+
+    const forceRender = (renderCompleted) => {
+      for (let i = 0, l = owners.length; i < l; i++) {
+        (owners[i]).$forceUpdate();
       }
-      defineReactive$$1(props, key, value, () => {
-        if (!isRoot && !isUpdatingChildComponent) {
-          warn(
-            `Avoid mutating a prop directly since the value will be ` +
-            `overwritten whenever the parent component re-renders. ` +
-            `Instead, use a data or computed property based on the prop's ` +
-            `value. Prop being mutated: "${key}"`,
-            vm
-          );
-        }
-      });
-    }
-    // static props are already proxied on the component's prototype
-    // during Vue.extend(). We only need to proxy props defined at
-    // instantiation here.
-    if (!(key in vm)) {
-      proxy(vm, `_props`, key);
-    }
-  }
-  toggleObserving(true);
-}
 
-function initData (vm) {
-  let data = vm.$options.data;
-  data = vm._data = typeof data === 'function'
-    ? getData(data, vm)
-    : data || {};
-  if (!isPlainObject(data)) {
-    data = {};
-    warn(
-      'data functions should return an object:\n' +
-      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
-      vm
-    );
-  }
-  // proxy data on instance
-  const keys = Object.keys(data);
-  const props = vm.$options.props;
-  const methods = vm.$options.methods;
-  let i = keys.length;
-  while (i--) {
-    const key = keys[i];
-    {
-      if (methods && hasOwn(methods, key)) {
-        warn(
-          `Method "${key}" has already been defined as a data property.`,
-          vm
-        );
+      if (renderCompleted) {
+        owners.length = 0;
       }
-    }
-    if (props && hasOwn(props, key)) {
+    };
+
+    const resolve = once((res) => {
+      // cache resolved
+      factory.resolved = ensureCtor(res, baseCtor);
+      // invoke callbacks only if this is not a synchronous resolve
+      // (async resolves are shimmed as synchronous during SSR)
+      if (!sync) {
+        forceRender(true);
+      } else {
+        owners.length = 0;
+      }
+    });
+
+    const reject = once(reason => {
       warn(
-        `The data property "${key}" is already declared as a prop. ` +
-        `Use prop default value instead.`,
-        vm
+        `Failed to resolve async component: ${String(factory)}` +
+        (reason ? `\nReason: ${reason}` : '')
       );
-    } else if (!isReserved(key)) {
-      proxy(vm, `_data`, key);
-    }
-  }
-  // observe data
-  observe(data, true /* asRootData */);
-}
+      if (isDef(factory.errorComp)) {
+        factory.error = true;
+        forceRender(true);
+      }
+    });
 
-function getData (data, vm) {
-  // #7573 disable dep collection when invoking data getters
-  pushTarget();
-  try {
-    return data.call(vm, vm)
-  } catch (e) {
-    handleError(e, vm, `data()`);
-    return {}
-  } finally {
-    popTarget();
+    const res = factory(resolve, reject);
+
+    if (isObject(res)) {
+      if (isPromise(res)) {
+        // () => Promise
+        if (isUndef(factory.resolved)) {
+          res.then(resolve, reject);
+        }
+      } else if (isPromise(res.component)) {
+        res.component.then(resolve, reject);
+
+        if (isDef(res.error)) {
+          factory.errorComp = ensureCtor(res.error, baseCtor);
+        }
+
+        if (isDef(res.loading)) {
+          factory.loadingComp = ensureCtor(res.loading, baseCtor);
+          if (res.delay === 0) {
+            factory.loading = true;
+          } else {
+            setTimeout(() => {
+              if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                factory.loading = true;
+                forceRender(false);
+              }
+            }, res.delay || 200);
+          }
+        }
+
+        if (isDef(res.timeout)) {
+          setTimeout(() => {
+            if (isUndef(factory.resolved)) {
+              reject(
+                `timeout (${res.timeout}ms)`
+              );
+            }
+          }, res.timeout);
+        }
+      }
+    }
+
+    sync = false;
+    // return in case resolved synchronously
+    return factory.loading
+      ? factory.loadingComp
+      : factory.resolved
   }
 }
 
-const computedWatcherOptions = { lazy: true };
-
-function initComputed (vm, computed) {
-  // $flow-disable-line
-  const watchers = vm._computedWatchers = Object.create(null);
-  // computed properties are just getters during SSR
-  const isSSR = isServerRendering();
+/*  */
 
-  for (const key in computed) {
-    const userDef = computed[key];
-    const getter = typeof userDef === 'function' ? userDef : userDef.get;
-    if (getter == null) {
-      warn(
-        `Getter is missing for computed property "${key}".`,
-        vm
-      );
-    }
+function isAsyncPlaceholder (node) {
+  return node.isComment && node.asyncFactory
+}
 
-    if (!isSSR) {
-      // create internal watcher for the computed property.
-      watchers[key] = new Watcher(
-        vm,
-        getter || noop,
-        noop,
-        computedWatcherOptions
-      );
-    }
+/*  */
 
-    // component-defined computed properties are already defined on the
-    // component prototype. We only need to define computed properties defined
-    // at instantiation here.
-    if (!(key in vm)) {
-      defineComputed(vm, key, userDef);
-    } else {
-      if (key in vm.$data) {
-        warn(`The computed property "${key}" is already defined in data.`, vm);
-      } else if (vm.$options.props && key in vm.$options.props) {
-        warn(`The computed property "${key}" is already defined as a prop.`, vm);
+function getFirstComponentChild (children) {
+  if (Array.isArray(children)) {
+    for (let i = 0; i < children.length; i++) {
+      const c = children[i];
+      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+        return c
       }
     }
   }
 }
 
-function defineComputed (
-  target,
-  key,
-  userDef
-) {
-  const shouldCache = !isServerRendering();
-  if (typeof userDef === 'function') {
-    sharedPropertyDefinition.get = shouldCache
-      ? createComputedGetter(key)
-      : createGetterInvoker(userDef);
-    sharedPropertyDefinition.set = noop;
-  } else {
-    sharedPropertyDefinition.get = userDef.get
-      ? shouldCache && userDef.cache !== false
-        ? createComputedGetter(key)
-        : createGetterInvoker(userDef.get)
-      : noop;
-    sharedPropertyDefinition.set = userDef.set || noop;
-  }
-  if (sharedPropertyDefinition.set === noop) {
-    sharedPropertyDefinition.set = function () {
-      warn(
-        `Computed property "${key}" was assigned to but it has no setter.`,
-        this
-      );
-    };
-  }
-  Object.defineProperty(target, key, sharedPropertyDefinition);
-}
+/*  */
 
-function createComputedGetter (key) {
-  return function computedGetter () {
-    const watcher = this._computedWatchers && this._computedWatchers[key];
-    if (watcher) {
-      if (watcher.dirty) {
-        watcher.evaluate();
-      }
-      if (Dep.target) {
-        watcher.depend();
-      }
-      return watcher.value
-    }
+/*  */
+
+function initEvents (vm) {
+  vm._events = Object.create(null);
+  vm._hasHookEvent = false;
+  // init parent attached events
+  const listeners = vm.$options._parentListeners;
+  if (listeners) {
+    updateComponentListeners(vm, listeners);
   }
 }
 
-function createGetterInvoker(fn) {
-  return function computedGetter () {
-    return fn.call(this, this)
-  }
+let target;
+
+function add (event, fn) {
+  target.$on(event, fn);
 }
 
-function initMethods (vm, methods) {
-  const props = vm.$options.props;
-  for (const key in methods) {
-    {
-      if (typeof methods[key] !== 'function') {
-        warn(
-          `Method "${key}" has type "${typeof methods[key]}" in the component definition. ` +
-          `Did you reference the function correctly?`,
-          vm
-        );
-      }
-      if (props && hasOwn(props, key)) {
-        warn(
-          `Method "${key}" has already been defined as a prop.`,
-          vm
-        );
-      }
-      if ((key in vm) && isReserved(key)) {
-        warn(
-          `Method "${key}" conflicts with an existing Vue instance method. ` +
-          `Avoid defining component methods that start with _ or $.`
-        );
-      }
-    }
-    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
-  }
+function remove$1 (event, fn) {
+  target.$off(event, fn);
 }
 
-function initWatch (vm, watch) {
-  for (const key in watch) {
-    const handler = watch[key];
-    if (Array.isArray(handler)) {
-      for (let i = 0; i < handler.length; i++) {
-        createWatcher(vm, key, handler[i]);
-      }
-    } else {
-      createWatcher(vm, key, handler);
+function createOnceHandler (event, fn) {
+  const _target = target;
+  return function onceHandler () {
+    const res = fn.apply(null, arguments);
+    if (res !== null) {
+      _target.$off(event, onceHandler);
     }
   }
 }
 
-function createWatcher (
+function updateComponentListeners (
   vm,
-  expOrFn,
-  handler,
-  options
+  listeners,
+  oldListeners
 ) {
-  if (isPlainObject(handler)) {
-    options = handler;
-    handler = handler.handler;
-  }
-  if (typeof handler === 'string') {
-    handler = vm[handler];
-  }
-  return vm.$watch(expOrFn, handler, options)
+  target = vm;
+  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+  target = undefined;
 }
 
-function stateMixin (Vue) {
-  // flow somehow has problems with directly declared definition object
-  // when using Object.defineProperty, so we have to procedurally build up
-  // the object here.
-  const dataDef = {};
-  dataDef.get = function () { return this._data };
-  const propsDef = {};
-  propsDef.get = function () { return this._props };
-  {
-    dataDef.set = function () {
-      warn(
-        'Avoid replacing instance root $data. ' +
-        'Use nested data properties instead.',
-        this
-      );
-    };
-    propsDef.set = function () {
-      warn(`$props is readonly.`, this);
-    };
-  }
-  Object.defineProperty(Vue.prototype, '$data', dataDef);
-  Object.defineProperty(Vue.prototype, '$props', propsDef);
+function eventsMixin (Vue) {
+  const hookRE = /^hook:/;
+  Vue.prototype.$on = function (event, fn) {
+    const vm = this;
+    if (Array.isArray(event)) {
+      for (let i = 0, l = event.length; i < l; i++) {
+        vm.$on(event[i], fn);
+      }
+    } else {
+      (vm._events[event] || (vm._events[event] = [])).push(fn);
+      // optimize hook:event cost by using a boolean flag marked at registration
+      // instead of a hash lookup
+      if (hookRE.test(event)) {
+        vm._hasHookEvent = true;
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$set = set;
-  Vue.prototype.$delete = del;
+  Vue.prototype.$once = function (event, fn) {
+    const vm = this;
+    function on () {
+      vm.$off(event, on);
+      fn.apply(vm, arguments);
+    }
+    on.fn = fn;
+    vm.$on(event, on);
+    return vm
+  };
+
+  Vue.prototype.$off = function (event, fn) {
+    const vm = this;
+    // all
+    if (!arguments.length) {
+      vm._events = Object.create(null);
+      return vm
+    }
+    // array of events
+    if (Array.isArray(event)) {
+      for (let i = 0, l = event.length; i < l; i++) {
+        vm.$off(event[i], fn);
+      }
+      return vm
+    }
+    // specific event
+    const cbs = vm._events[event];
+    if (!cbs) {
+      return vm
+    }
+    if (!fn) {
+      vm._events[event] = null;
+      return vm
+    }
+    // specific handler
+    let cb;
+    let i = cbs.length;
+    while (i--) {
+      cb = cbs[i];
+      if (cb === fn || cb.fn === fn) {
+        cbs.splice(i, 1);
+        break
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$watch = function (
-    expOrFn,
-    cb,
-    options
-  ) {
+  Vue.prototype.$emit = function (event) {
     const vm = this;
-    if (isPlainObject(cb)) {
-      return createWatcher(vm, expOrFn, cb, options)
-    }
-    options = options || {};
-    options.user = true;
-    const watcher = new Watcher(vm, expOrFn, cb, options);
-    if (options.immediate) {
-      try {
-        cb.call(vm, watcher.value);
-      } catch (error) {
-        handleError(error, vm, `callback for immediate watcher "${watcher.expression}"`);
+    {
+      const lowerCaseEvent = event.toLowerCase();
+      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+        tip(
+          `Event "${lowerCaseEvent}" is emitted in component ` +
+          `${formatComponentName(vm)} but the handler is registered for "${event}". ` +
+          `Note that HTML attributes are case-insensitive and you cannot use ` +
+          `v-on to listen to camelCase events when using in-DOM templates. ` +
+          `You should probably use "${hyphenate(event)}" instead of "${event}".`
+        );
       }
     }
-    return function unwatchFn () {
-      watcher.teardown();
+    let cbs = vm._events[event];
+    if (cbs) {
+      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+      const args = toArray(arguments, 1);
+      const info = `event handler for "${event}"`;
+      for (let i = 0, l = cbs.length; i < l; i++) {
+        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+      }
     }
+    return vm
   };
 }
 
 /*  */
 
-function initProvide (vm) {
-  const provide = vm.$options.provide;
-  if (provide) {
-    vm._provided = typeof provide === 'function'
-      ? provide.call(vm)
-      : provide;
-  }
-}
+let activeInstance = null;
+let isUpdatingChildComponent = false;
 
-function initInjections (vm) {
-  const result = resolveInject(vm.$options.inject, vm);
-  if (result) {
-    toggleObserving(false);
-    Object.keys(result).forEach(key => {
-      /* istanbul ignore else */
-      {
-        defineReactive$$1(vm, key, result[key], () => {
-          warn(
-            `Avoid mutating an injected value directly since the changes will be ` +
-            `overwritten whenever the provided component re-renders. ` +
-            `injection being mutated: "${key}"`,
-            vm
-          );
-        });
-      }
-    });
-    toggleObserving(true);
+function setActiveInstance(vm) {
+  const prevActiveInstance = activeInstance;
+  activeInstance = vm;
+  return () => {
+    activeInstance = prevActiveInstance;
   }
 }
 
-function resolveInject (inject, vm) {
-  if (inject) {
-    // inject is :any because flow is not smart enough to figure out cached
-    const result = Object.create(null);
-    const keys = hasSymbol
-      ? Reflect.ownKeys(inject)
-      : Object.keys(inject);
+function initLifecycle (vm) {
+  const options = vm.$options;
 
-    for (let i = 0; i < keys.length; i++) {
-      const key = keys[i];
-      // #6574 in case the inject object is observed...
-      if (key === '__ob__') continue
-      const provideKey = inject[key].from;
-      let source = vm;
-      while (source) {
-        if (source._provided && hasOwn(source._provided, provideKey)) {
-          result[key] = source._provided[provideKey];
-          break
-        }
-        source = source.$parent;
-      }
-      if (!source) {
-        if ('default' in inject[key]) {
-          const provideDefault = inject[key].default;
-          result[key] = typeof provideDefault === 'function'
-            ? provideDefault.call(vm)
-            : provideDefault;
-        } else {
-          warn(`Injection "${key}" not found`, vm);
-        }
-      }
+  // locate first non-abstract parent
+  let parent = options.parent;
+  if (parent && !options.abstract) {
+    while (parent.$options.abstract && parent.$parent) {
+      parent = parent.$parent;
     }
-    return result
+    parent.$children.push(vm);
   }
-}
 
-/*  */
+  vm.$parent = parent;
+  vm.$root = parent ? parent.$root : vm;
 
-function normalizeScopedSlots (
-  slots,
-  normalSlots
-) {
-  let res;
-  if (!slots) {
-    res = {};
-  } else if (slots._normalized) {
-    return slots
-  } else {
-    res = {};
-    for (const key in slots) {
-      if (slots[key] && key[0] !== '$') {
-        res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-      }
-    }
-  }
-  // expose normal slots on scopedSlots
-  for (const key in normalSlots) {
-    if (!(key in res)) {
-      res[key] = proxyNormalSlot(normalSlots, key);
-    }
-  }
-  res._normalized = true;
-  res.$stable = slots ? slots.$stable : true;
-  return res
-}
+  vm.$children = [];
+  vm.$refs = {};
 
-function normalizeScopedSlot(normalSlots, key, fn) {
-  const normalized = (scope = {}) => {
-    const res = fn(scope);
-    return res && typeof res === 'object' && !Array.isArray(res)
-      ? [res] // single vnode
-      : normalizeChildren(res)
-  };
-  // proxy scoped slots on normal $slots
-  if (!hasOwn(normalSlots, key)) {
-    Object.defineProperty(normalSlots, key, {
-      get: normalized
-    });
-  }
-  return normalized
+  vm._watcher = null;
+  vm._inactive = null;
+  vm._directInactive = false;
+  vm._isMounted = false;
+  vm._isDestroyed = false;
+  vm._isBeingDestroyed = false;
 }
 
-function proxyNormalSlot(slots, key) {
-  return () => slots[key]
-}
+function lifecycleMixin (Vue) {
+  Vue.prototype._update = function (vnode, hydrating) {
+    const vm = this;
+    const prevEl = vm.$el;
+    const prevVnode = vm._vnode;
+    const restoreActiveInstance = setActiveInstance(vm);
+    vm._vnode = vnode;
+    // Vue.prototype.__patch__ is injected in entry points
+    // based on the rendering backend used.
+    if (!prevVnode) {
+      // initial render
+      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+    } else {
+      // updates
+      vm.$el = vm.__patch__(prevVnode, vnode);
+    }
+    restoreActiveInstance();
+    // update __vue__ reference
+    if (prevEl) {
+      prevEl.__vue__ = null;
+    }
+    if (vm.$el) {
+      vm.$el.__vue__ = vm;
+    }
+    // if parent is an HOC, update its $el as well
+    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+      vm.$parent.$el = vm.$el;
+    }
+    // updated hook is called by the scheduler to ensure that children are
+    // updated in a parent's updated hook.
+  };
 
-/*  */
+  Vue.prototype.$forceUpdate = function () {
+    const vm = this;
+    if (vm._watcher) {
+      vm._watcher.update();
+    }
+  };
 
-/**
- * Runtime helper for rendering v-for lists.
- */
-function renderList (
-  val,
-  render
-) {
-  let ret, i, l, keys, key;
-  if (Array.isArray(val) || typeof val === 'string') {
-    ret = new Array(val.length);
-    for (i = 0, l = val.length; i < l; i++) {
-      ret[i] = render(val[i], i);
+  Vue.prototype.$destroy = function () {
+    const vm = this;
+    if (vm._isBeingDestroyed) {
+      return
     }
-  } else if (typeof val === 'number') {
-    ret = new Array(val);
-    for (i = 0; i < val; i++) {
-      ret[i] = render(i + 1, i);
+    callHook(vm, 'beforeDestroy');
+    vm._isBeingDestroyed = true;
+    // remove self from parent
+    const parent = vm.$parent;
+    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+      remove(parent.$children, vm);
     }
-  } else if (isObject(val)) {
-    if (hasSymbol && val[Symbol.iterator]) {
-      ret = [];
-      const iterator = val[Symbol.iterator]();
-      let result = iterator.next();
-      while (!result.done) {
-        ret.push(render(result.value, ret.length));
-        result = iterator.next();
-      }
-    } else {
-      keys = Object.keys(val);
-      ret = new Array(keys.length);
-      for (i = 0, l = keys.length; i < l; i++) {
-        key = keys[i];
-        ret[i] = render(val[key], key, i);
-      }
+    // teardown watchers
+    if (vm._watcher) {
+      vm._watcher.teardown();
+    }
+    let i = vm._watchers.length;
+    while (i--) {
+      vm._watchers[i].teardown();
+    }
+    // remove reference from data ob
+    // frozen object may not have observer.
+    if (vm._data.__ob__) {
+      vm._data.__ob__.vmCount--;
     }
-  }
-  if (!isDef(ret)) {
-    ret = [];
-  }
-  (ret)._isVList = true;
-  return ret
+    // call the last hook...
+    vm._isDestroyed = true;
+    // invoke destroy hooks on current rendered tree
+    vm.__patch__(vm._vnode, null);
+    // fire destroyed hook
+    callHook(vm, 'destroyed');
+    // turn off all instance listeners.
+    vm.$off();
+    // remove __vue__ reference
+    if (vm.$el) {
+      vm.$el.__vue__ = null;
+    }
+    // release circular reference (#6759)
+    if (vm.$vnode) {
+      vm.$vnode.parent = null;
+    }
+  };
 }
 
-/*  */
-
-/**
- * Runtime helper for rendering <slot>
- */
-function renderSlot (
-  name,
-  fallback,
-  props,
-  bindObject
+function mountComponent (
+  vm,
+  el,
+  hydrating
 ) {
-  const scopedSlotFn = this.$scopedSlots[name];
-  let nodes;
-  if (scopedSlotFn) { // scoped slot
-    props = props || {};
-    if (bindObject) {
-      if (!isObject(bindObject)) {
+  vm.$el = el;
+  if (!vm.$options.render) {
+    vm.$options.render = createEmptyVNode;
+    {
+      /* istanbul ignore if */
+      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+        vm.$options.el || el) {
         warn(
-          'slot v-bind without argument expects an Object',
-          this
+          'You are using the runtime-only build of Vue where the template ' +
+          'compiler is not available. Either pre-compile the templates into ' +
+          'render functions, or use the compiler-included build.',
+          vm
+        );
+      } else {
+        warn(
+          'Failed to mount component: template or render function not defined.',
+          vm
         );
       }
-      props = extend(extend({}, bindObject), props);
     }
-    nodes = scopedSlotFn(props) || fallback;
-  } else {
-    nodes = this.$slots[name] || fallback;
   }
+  callHook(vm, 'beforeMount');
 
-  const target = props && props.slot;
-  if (target) {
-    return this.$createElement('template', { slot: target }, nodes)
-  } else {
-    return nodes
-  }
-}
+  let updateComponent;
+  /* istanbul ignore if */
+  if (config.performance && mark) {
+    updateComponent = () => {
+      const name = vm._name;
+      const id = vm._uid;
+      const startTag = `vue-perf-start:${id}`;
+      const endTag = `vue-perf-end:${id}`;
 
-/*  */
+      mark(startTag);
+      const vnode = vm._render();
+      mark(endTag);
+      measure(`vue ${name} render`, startTag, endTag);
 
-/**
- * Runtime helper for resolving filters
- */
-function resolveFilter (id) {
-  return resolveAsset(this.$options, 'filters', id, true) || identity
-}
+      mark(startTag);
+      vm._update(vnode, hydrating);
+      mark(endTag);
+      measure(`vue ${name} patch`, startTag, endTag);
+    };
+  } else {
+    updateComponent = () => {
+      vm._update(vm._render(), hydrating);
+    };
+  }
 
-/*  */
+  // we set this to vm._watcher inside the watcher's constructor
+  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+  // component's mounted hook), which relies on vm._watcher being already defined
+  new Watcher(vm, updateComponent, noop, {
+    before () {
+      if (vm._isMounted && !vm._isDestroyed) {
+        callHook(vm, 'beforeUpdate');
+      }
+    }
+  }, true /* isRenderWatcher */);
+  hydrating = false;
 
-function isKeyNotMatch (expect, actual) {
-  if (Array.isArray(expect)) {
-    return expect.indexOf(actual) === -1
-  } else {
-    return expect !== actual
+  // manually mounted instance, call mounted on self
+  // mounted is called for render-created child components in its inserted hook
+  if (vm.$vnode == null) {
+    vm._isMounted = true;
+    callHook(vm, 'mounted');
   }
+  return vm
 }
 
-/**
- * Runtime helper for checking keyCodes from config.
- * exposed as Vue.prototype._k
- * passing in eventKeyName as last argument separately for backwards compat
- */
-function checkKeyCodes (
-  eventKeyCode,
-  key,
-  builtInKeyCode,
-  eventKeyName,
-  builtInKeyName
+function updateChildComponent (
+  vm,
+  propsData,
+  listeners,
+  parentVnode,
+  renderChildren
 ) {
-  const mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-    return isKeyNotMatch(builtInKeyName, eventKeyName)
-  } else if (mappedKeyCode) {
-    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-  } else if (eventKeyName) {
-    return hyphenate(eventKeyName) !== key
+  {
+    isUpdatingChildComponent = true;
   }
-}
 
-/*  */
+  // determine whether component has slot children
+  // we need to do this before overwriting $options._renderChildren.
 
-/**
- * Runtime helper for merging v-bind="object" into a VNode's data.
- */
-function bindObjectProps (
-  data,
-  tag,
-  value,
-  asProp,
-  isSync
-) {
-  if (value) {
-    if (!isObject(value)) {
-      warn(
-        'v-bind without argument expects an Object or Array value',
-        this
-      );
-    } else {
-      if (Array.isArray(value)) {
-        value = toObject(value);
-      }
-      let hash;
-      for (const key in value) {
-        if (
-          key === 'class' ||
-          key === 'style' ||
-          isReservedAttribute(key)
-        ) {
-          hash = data;
-        } else {
-          const type = data.attrs && data.attrs.type;
-          hash = asProp || config.mustUseProp(tag, type, key)
-            ? data.domProps || (data.domProps = {})
-            : data.attrs || (data.attrs = {});
-        }
-        const camelizedKey = camelize(key);
-        if (!(key in hash) && !(camelizedKey in hash)) {
-          hash[key] = value[key];
+  // check if there are dynamic scopedSlots (hand-written or compiled but with
+  // dynamic slot names). Static scoped slots compiled from template has the
+  // "$stable" marker.
+  const hasDynamicScopedSlot = !!(
+    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+  );
 
-          if (isSync) {
-            const on = data.on || (data.on = {});
-            on[`update:${camelizedKey}`] = function ($event) {
-              value[key] = $event;
-            };
-          }
-        }
-      }
-    }
+  // Any static slot children from the parent may have changed during parent's
+  // update. Dynamic scoped slots may also have changed. In such cases, a forced
+  // update is necessary to ensure correctness.
+  const needsForceUpdate = !!(
+    renderChildren ||               // has new static slots
+    vm.$options._renderChildren ||  // has old static slots
+    hasDynamicScopedSlot
+  );
+
+  vm.$options._parentVnode = parentVnode;
+  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+
+  if (vm._vnode) { // update child tree's parent
+    vm._vnode.parent = parentVnode;
   }
-  return data
-}
+  vm.$options._renderChildren = renderChildren;
 
-/*  */
+  // update $attrs and $listeners hash
+  // these are also reactive so they may trigger child update if the child
+  // used them during render
+  vm.$attrs = parentVnode.data.attrs || emptyObject;
+  vm.$listeners = listeners || emptyObject;
 
-/**
- * Runtime helper for rendering static trees.
- */
-function renderStatic (
-  index,
-  isInFor
-) {
-  const cached = this._staticTrees || (this._staticTrees = []);
-  let tree = cached[index];
-  // if has already-rendered static tree and not inside v-for,
-  // we can reuse the same tree.
-  if (tree && !isInFor) {
-    return tree
+  // update props
+  if (propsData && vm.$options.props) {
+    toggleObserving(false);
+    const props = vm._props;
+    const propKeys = vm.$options._propKeys || [];
+    for (let i = 0; i < propKeys.length; i++) {
+      const key = propKeys[i];
+      const propOptions = vm.$options.props; // wtf flow?
+      props[key] = validateProp(key, propOptions, propsData, vm);
+    }
+    toggleObserving(true);
+    // keep a copy of raw propsData
+    vm.$options.propsData = propsData;
   }
-  // otherwise, render a fresh tree.
-  tree = cached[index] = this.$options.staticRenderFns[index].call(
-    this._renderProxy,
-    null,
-    this // for render fns generated for functional component templates
-  );
-  markStatic(tree, `__static__${index}`, false);
-  return tree
-}
 
-/**
- * Runtime helper for v-once.
- * Effectively it means marking the node as static with a unique key.
- */
-function markOnce (
-  tree,
-  index,
-  key
-) {
-  markStatic(tree, `__once__${index}${key ? `_${key}` : ``}`, true);
-  return tree
-}
+  // update listeners
+  listeners = listeners || emptyObject;
+  const oldListeners = vm.$options._parentListeners;
+  vm.$options._parentListeners = listeners;
+  updateComponentListeners(vm, listeners, oldListeners);
 
-function markStatic (
-  tree,
-  key,
-  isOnce
-) {
-  if (Array.isArray(tree)) {
-    for (let i = 0; i < tree.length; i++) {
-      if (tree[i] && typeof tree[i] !== 'string') {
-        markStaticNode(tree[i], `${key}_${i}`, isOnce);
-      }
-    }
-  } else {
-    markStaticNode(tree, key, isOnce);
+  // resolve slots + force update if has children
+  if (needsForceUpdate) {
+    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+    vm.$forceUpdate();
   }
-}
 
-function markStaticNode (node, key, isOnce) {
-  node.isStatic = true;
-  node.key = key;
-  node.isOnce = isOnce;
+  {
+    isUpdatingChildComponent = false;
+  }
 }
 
-/*  */
+function isInInactiveTree (vm) {
+  while (vm && (vm = vm.$parent)) {
+    if (vm._inactive) return true
+  }
+  return false
+}
 
-function bindObjectListeners (data, value) {
-  if (value) {
-    if (!isPlainObject(value)) {
-      warn(
-        'v-on without argument expects an Object value',
-        this
-      );
-    } else {
-      const on = data.on = data.on ? extend({}, data.on) : {};
-      for (const key in value) {
-        const existing = on[key];
-        const ours = value[key];
-        on[key] = existing ? [].concat(existing, ours) : ours;
-      }
+function activateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = false;
+    if (isInInactiveTree(vm)) {
+      return
+    }
+  } else if (vm._directInactive) {
+    return
+  }
+  if (vm._inactive || vm._inactive === null) {
+    vm._inactive = false;
+    for (let i = 0; i < vm.$children.length; i++) {
+      activateChildComponent(vm.$children[i]);
     }
+    callHook(vm, 'activated');
   }
-  return data
 }
 
-/*  */
-
-function bindDynamicKeys (baseObj, values) {
-  for (let i = 0; i < values.length; i += 2) {
-    const key = values[i];
-    if (typeof key === 'string' && key) {
-      baseObj[values[i]] = values[i + 1];
-    } else if (key !== '' && key !== null) {
-      // null is a speical value for explicitly removing a binding
-      warn(
-        `Invalid value for dynamic directive argument (expected string or null): ${key}`,
-        this
-      );
+function deactivateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = true;
+    if (isInInactiveTree(vm)) {
+      return
     }
   }
-  return baseObj
+  if (!vm._inactive) {
+    vm._inactive = true;
+    for (let i = 0; i < vm.$children.length; i++) {
+      deactivateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'deactivated');
+  }
 }
 
-// helper to dynamically append modifier runtime markers to event names.
-// ensure only append when value is already string, otherwise it will be cast
-// to string and cause the type check to miss.
-function prependModifier (value, symbol) {
-  return typeof value === 'string' ? symbol + value : value
+function callHook (vm, hook) {
+  // #7573 disable dep collection when invoking lifecycle hooks
+  pushTarget();
+  const handlers = vm.$options[hook];
+  const info = `${hook} hook`;
+  if (handlers) {
+    for (let i = 0, j = handlers.length; i < j; i++) {
+      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+    }
+  }
+  if (vm._hasHookEvent) {
+    vm.$emit('hook:' + hook);
+  }
+  popTarget();
 }
 
 /*  */
 
-function installRenderHelpers (target) {
-  target._o = markOnce;
-  target._n = toNumber;
-  target._s = toString;
-  target._l = renderList;
-  target._t = renderSlot;
-  target._q = looseEqual;
-  target._i = looseIndexOf;
-  target._m = renderStatic;
-  target._f = resolveFilter;
-  target._k = checkKeyCodes;
-  target._b = bindObjectProps;
-  target._v = createTextVNode;
-  target._e = createEmptyVNode;
-  target._u = resolveScopedSlots;
-  target._g = bindObjectListeners;
-  target._d = bindDynamicKeys;
-  target._p = prependModifier;
-}
+const MAX_UPDATE_COUNT = 100;
 
-/*  */
+const queue = [];
+const activatedChildren = [];
+let has = {};
+let circular = {};
+let waiting = false;
+let flushing = false;
+let index = 0;
 
-function FunctionalRenderContext (
-  data,
-  props,
-  children,
-  parent,
-  Ctor
-) {
-  const options = Ctor.options;
-  // ensure the createElement function in functional components
-  // gets a unique context - this is necessary for correct named slot check
-  let contextVm;
-  if (hasOwn(parent, '_uid')) {
-    contextVm = Object.create(parent);
-    // $flow-disable-line
-    contextVm._original = parent;
-  } else {
-    // the context vm passed in is a functional context as well.
-    // in this case we want to make sure we are able to get a hold to the
-    // real context instance.
-    contextVm = parent;
-    // $flow-disable-line
-    parent = parent._original;
+/**
+ * Reset the scheduler's state.
+ */
+function resetSchedulerState () {
+  index = queue.length = activatedChildren.length = 0;
+  has = {};
+  {
+    circular = {};
   }
-  const isCompiled = isTrue(options._compiled);
-  const needNormalization = !isCompiled;
+  waiting = flushing = false;
+}
 
-  this.data = data;
-  this.props = props;
-  this.children = children;
-  this.parent = parent;
-  this.listeners = data.on || emptyObject;
-  this.injections = resolveInject(options.inject, parent);
-  this.slots = () => resolveSlots(children, parent);
+// Async edge case #6566 requires saving the timestamp when event listeners are
+// attached. However, calling performance.now() has a perf overhead especially
+// if the page has thousands of event listeners. Instead, we take a timestamp
+// every time the scheduler flushes and use that for all event listeners
+// attached during that flush.
+let currentFlushTimestamp = 0;
 
-  Object.defineProperty(this, 'scopedSlots', ({
-    enumerable: true,
-    get () {
-      return normalizeScopedSlots(data.scopedSlots, this.slots())
-    }
-  }));
+// Async edge case fix requires storing an event listener's attach timestamp.
+let getNow = Date.now;
 
-  // support for compiled functional template
-  if (isCompiled) {
-    // exposing $options for renderStatic()
-    this.$options = options;
-    // pre-resolve slots for renderSlot()
-    this.$slots = this.slots();
-    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
-  }
+// Determine what event timestamp the browser is using. Annoyingly, the
+// timestamp can either be hi-res (relative to page load) or low-res
+// (relative to UNIX epoch), so in order to compare time we have to use the
+// same timestamp type when saving the flush timestamp.
+if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+  // if the low-res timestamp which is bigger than the event timestamp
+  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+  // and we need to use the hi-res version for event listeners as well.
+  getNow = () => performance.now();
+}
 
-  if (options._scopeId) {
-    this._c = (a, b, c, d) => {
-      const vnode = createElement(contextVm, a, b, c, d, needNormalization);
-      if (vnode && !Array.isArray(vnode)) {
-        vnode.fnScopeId = options._scopeId;
-        vnode.fnContext = parent;
+/**
+ * Flush both queues and run the watchers.
+ */
+function flushSchedulerQueue () {
+  currentFlushTimestamp = getNow();
+  flushing = true;
+  let watcher, id;
+
+  // Sort queue before flush.
+  // This ensures that:
+  // 1. Components are updated from parent to child. (because parent is always
+  //    created before the child)
+  // 2. A component's user watchers are run before its render watcher (because
+  //    user watchers are created before the render watcher)
+  // 3. If a component is destroyed during a parent component's watcher run,
+  //    its watchers can be skipped.
+  queue.sort((a, b) => a.id - b.id);
+
+  // do not cache length because more watchers might be pushed
+  // as we run existing watchers
+  for (index = 0; index < queue.length; index++) {
+    watcher = queue[index];
+    if (watcher.before) {
+      watcher.before();
+    }
+    id = watcher.id;
+    has[id] = null;
+    watcher.run();
+    // in dev build, check and stop circular updates.
+    if (has[id] != null) {
+      circular[id] = (circular[id] || 0) + 1;
+      if (circular[id] > MAX_UPDATE_COUNT) {
+        warn(
+          'You may have an infinite update loop ' + (
+            watcher.user
+              ? `in watcher with expression "${watcher.expression}"`
+              : `in a component render function.`
+          ),
+          watcher.vm
+        );
+        break
       }
-      return vnode
-    };
-  } else {
-    this._c = (a, b, c, d) => createElement(contextVm, a, b, c, d, needNormalization);
+    }
   }
-}
 
-installRenderHelpers(FunctionalRenderContext.prototype);
+  // keep copies of post queues before resetting state
+  const activatedQueue = activatedChildren.slice();
+  const updatedQueue = queue.slice();
 
-function createFunctionalComponent (
-  Ctor,
-  propsData,
-  data,
-  contextVm,
-  children
-) {
-  const options = Ctor.options;
-  const props = {};
-  const propOptions = options.props;
-  if (isDef(propOptions)) {
-    for (const key in propOptions) {
-      props[key] = validateProp(key, propOptions, propsData || emptyObject);
-    }
-  } else {
-    if (isDef(data.attrs)) mergeProps(props, data.attrs);
-    if (isDef(data.props)) mergeProps(props, data.props);
-  }
+  resetSchedulerState();
 
-  const renderContext = new FunctionalRenderContext(
-    data,
-    props,
-    children,
-    contextVm,
-    Ctor
-  );
+  // call component updated and activated hooks
+  callActivatedHooks(activatedQueue);
+  callUpdatedHooks(updatedQueue);
 
-  const vnode = options.render.call(null, renderContext._c, renderContext);
+  // devtool hook
+  /* istanbul ignore if */
+  if (devtools && config.devtools) {
+    devtools.emit('flush');
+  }
+}
 
-  if (vnode instanceof VNode) {
-    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
-  } else if (Array.isArray(vnode)) {
-    const vnodes = normalizeChildren(vnode) || [];
-    const res = new Array(vnodes.length);
-    for (let i = 0; i < vnodes.length; i++) {
-      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+function callUpdatedHooks (queue) {
+  let i = queue.length;
+  while (i--) {
+    const watcher = queue[i];
+    const vm = watcher.vm;
+    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+      callHook(vm, 'updated');
     }
-    return res
   }
 }
 
-function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
-  // #7817 clone node before setting fnContext, otherwise if the node is reused
-  // (e.g. it was from a cached normal slot) the fnContext causes named slots
-  // that should not be matched to match.
-  const clone = cloneVNode(vnode);
-  clone.fnContext = contextVm;
-  clone.fnOptions = options;
-  {
-    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
-  }
-  if (data.slot) {
-    (clone.data || (clone.data = {})).slot = data.slot;
-  }
-  return clone
+/**
+ * Queue a kept-alive component that was activated during patch.
+ * The queue will be processed after the entire tree has been patched.
+ */
+function queueActivatedComponent (vm) {
+  // setting _inactive to false here so that a render function can
+  // rely on checking whether it's in an inactive tree (e.g. router-view)
+  vm._inactive = false;
+  activatedChildren.push(vm);
 }
 
-function mergeProps (to, from) {
-  for (const key in from) {
-    to[camelize(key)] = from[key];
+function callActivatedHooks (queue) {
+  for (let i = 0; i < queue.length; i++) {
+    queue[i]._inactive = true;
+    activateChildComponent(queue[i], true /* true */);
   }
 }
 
-/*  */
+/**
+ * Push a watcher into the watcher queue.
+ * Jobs with duplicate IDs will be skipped unless it's
+ * pushed when the queue is being flushed.
+ */
+function queueWatcher (watcher) {
+  const id = watcher.id;
+  if (has[id] == null) {
+    has[id] = true;
+    if (!flushing) {
+      queue.push(watcher);
+    } else {
+      // if already flushing, splice the watcher based on its id
+      // if already past its id, it will be run next immediately.
+      let i = queue.length - 1;
+      while (i > index && queue[i].id > watcher.id) {
+        i--;
+      }
+      queue.splice(i + 1, 0, watcher);
+    }
+    // queue the flush
+    if (!waiting) {
+      waiting = true;
 
-/*  */
+      if (!config.async) {
+        flushSchedulerQueue();
+        return
+      }
+      nextTick(flushSchedulerQueue);
+    }
+  }
+}
 
 /*  */
 
-/*  */
 
-// inline hooks to be invoked on component VNodes during patch
-const componentVNodeHooks = {
-  init (vnode, hydrating) {
-    if (
-      vnode.componentInstance &&
-      !vnode.componentInstance._isDestroyed &&
-      vnode.data.keepAlive
-    ) {
-      // kept-alive components, treat as a patch
-      const mountedNode = vnode; // work around flow
-      componentVNodeHooks.prepatch(mountedNode, mountedNode);
-    } else {
-      const child = vnode.componentInstance = createComponentInstanceForVnode(
-        vnode,
-        activeInstance
-      );
-      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
-    }
-  },
 
-  prepatch (oldVnode, vnode) {
-    const options = vnode.componentOptions;
-    const child = vnode.componentInstance = oldVnode.componentInstance;
-    updateChildComponent(
-      child,
-      options.propsData, // updated props
-      options.listeners, // updated listeners
-      vnode, // new parent vnode
-      options.children // new children
-    );
-  },
+let uid$2 = 0;
 
-  insert (vnode) {
-    const { context, componentInstance } = vnode;
-    if (!componentInstance._isMounted) {
-      componentInstance._isMounted = true;
-      callHook(componentInstance, 'mounted');
+/**
+ * A watcher parses an expression, collects dependencies,
+ * and fires callback when the expression value changes.
+ * This is used for both the $watch() api and directives.
+ */
+class Watcher {
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+  
+
+  constructor (
+    vm,
+    expOrFn,
+    cb,
+    options,
+    isRenderWatcher
+  ) {
+    this.vm = vm;
+    if (isRenderWatcher) {
+      vm._watcher = this;
     }
-    if (vnode.data.keepAlive) {
-      if (context._isMounted) {
-        // vue-router#1212
-        // During updates, a kept-alive component's child components may
-        // change, so directly walking the tree here may call activated hooks
-        // on incorrect children. Instead we push them into a queue which will
-        // be processed after the whole patch process ended.
-        queueActivatedComponent(componentInstance);
-      } else {
-        activateChildComponent(componentInstance, true /* direct */);
+    vm._watchers.push(this);
+    // options
+    if (options) {
+      this.deep = !!options.deep;
+      this.user = !!options.user;
+      this.lazy = !!options.lazy;
+      this.sync = !!options.sync;
+      this.before = options.before;
+    } else {
+      this.deep = this.user = this.lazy = this.sync = false;
+    }
+    this.cb = cb;
+    this.id = ++uid$2; // uid for batching
+    this.active = true;
+    this.dirty = this.lazy; // for lazy watchers
+    this.deps = [];
+    this.newDeps = [];
+    this.depIds = new _Set();
+    this.newDepIds = new _Set();
+    this.expression = expOrFn.toString();
+    // parse expression for getter
+    if (typeof expOrFn === 'function') {
+      this.getter = expOrFn;
+    } else {
+      this.getter = parsePath(expOrFn);
+      if (!this.getter) {
+        this.getter = noop;
+        warn(
+          `Failed watching path: "${expOrFn}" ` +
+          'Watcher only accepts simple dot-delimited paths. ' +
+          'For full control, use a function instead.',
+          vm
+        );
       }
     }
-  },
+    this.value = this.lazy
+      ? undefined
+      : this.get();
+  }
 
-  destroy (vnode) {
-    const { componentInstance } = vnode;
-    if (!componentInstance._isDestroyed) {
-      if (!vnode.data.keepAlive) {
-        componentInstance.$destroy();
+  /**
+   * Evaluate the getter, and re-collect dependencies.
+   */
+  get () {
+    pushTarget(this);
+    let value;
+    const vm = this.vm;
+    try {
+      value = this.getter.call(vm, vm);
+    } catch (e) {
+      if (this.user) {
+        handleError(e, vm, `getter for watcher "${this.expression}"`);
       } else {
-        deactivateChildComponent(componentInstance, true /* direct */);
+        throw e
+      }
+    } finally {
+      // "touch" every property so they are all tracked as
+      // dependencies for deep watching
+      if (this.deep) {
+        traverse(value);
       }
+      popTarget();
+      this.cleanupDeps();
     }
+    return value
   }
-};
-
-const hooksToMerge = Object.keys(componentVNodeHooks);
 
-function createComponent (
-  Ctor,
-  data,
-  context,
-  children,
-  tag
-) {
-  if (isUndef(Ctor)) {
-    return
+  /**
+   * Add a dependency to this directive.
+   */
+  addDep (dep) {
+    const id = dep.id;
+    if (!this.newDepIds.has(id)) {
+      this.newDepIds.add(id);
+      this.newDeps.push(dep);
+      if (!this.depIds.has(id)) {
+        dep.addSub(this);
+      }
+    }
   }
 
-  const baseCtor = context.$options._base;
-
-  // plain options object: turn it into a constructor
-  if (isObject(Ctor)) {
-    Ctor = baseCtor.extend(Ctor);
+  /**
+   * Clean up for dependency collection.
+   */
+  cleanupDeps () {
+    let i = this.deps.length;
+    while (i--) {
+      const dep = this.deps[i];
+      if (!this.newDepIds.has(dep.id)) {
+        dep.removeSub(this);
+      }
+    }
+    let tmp = this.depIds;
+    this.depIds = this.newDepIds;
+    this.newDepIds = tmp;
+    this.newDepIds.clear();
+    tmp = this.deps;
+    this.deps = this.newDeps;
+    this.newDeps = tmp;
+    this.newDeps.length = 0;
   }
 
-  // if at this stage it's not a constructor or an async component factory,
-  // reject.
-  if (typeof Ctor !== 'function') {
-    {
-      warn(`Invalid Component definition: ${String(Ctor)}`, context);
+  /**
+   * Subscriber interface.
+   * Will be called when a dependency changes.
+   */
+  update () {
+    /* istanbul ignore else */
+    if (this.lazy) {
+      this.dirty = true;
+    } else if (this.sync) {
+      this.run();
+    } else {
+      queueWatcher(this);
     }
-    return
   }
 
-  // async component
-  let asyncFactory;
-  if (isUndef(Ctor.cid)) {
-    asyncFactory = Ctor;
-    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
-    if (Ctor === undefined) {
-      // return a placeholder node for async component, which is rendered
-      // as a comment node but preserves all the raw information for the node.
-      // the information will be used for async server-rendering and hydration.
-      return createAsyncPlaceholder(
-        asyncFactory,
-        data,
-        context,
-        children,
-        tag
-      )
+  /**
+   * Scheduler job interface.
+   * Will be called by the scheduler.
+   */
+  run () {
+    if (this.active) {
+      const value = this.get();
+      if (
+        value !== this.value ||
+        // Deep watchers and watchers on Object/Arrays should fire even
+        // when the value is the same, because the value may
+        // have mutated.
+        isObject(value) ||
+        this.deep
+      ) {
+        // set new value
+        const oldValue = this.value;
+        this.value = value;
+        if (this.user) {
+          try {
+            this.cb.call(this.vm, value, oldValue);
+          } catch (e) {
+            handleError(e, this.vm, `callback for watcher "${this.expression}"`);
+          }
+        } else {
+          this.cb.call(this.vm, value, oldValue);
+        }
+      }
     }
   }
 
-  data = data || {};
-
-  // resolve constructor options in case global mixins are applied after
-  // component constructor creation
-  resolveConstructorOptions(Ctor);
-
-  // transform component v-model data into props & events
-  if (isDef(data.model)) {
-    transformModel(Ctor.options, data);
+  /**
+   * Evaluate the value of the watcher.
+   * This only gets called for lazy watchers.
+   */
+  evaluate () {
+    this.value = this.get();
+    this.dirty = false;
   }
 
-  // extract props
-  const propsData = extractPropsFromVNodeData(data, Ctor, tag);
-
-  // functional component
-  if (isTrue(Ctor.options.functional)) {
-    return createFunctionalComponent(Ctor, propsData, data, context, children)
+  /**
+   * Depend on all deps collected by this watcher.
+   */
+  depend () {
+    let i = this.deps.length;
+    while (i--) {
+      this.deps[i].depend();
+    }
   }
 
-  // extract listeners, since these needs to be treated as
-  // child component listeners instead of DOM listeners
-  const listeners = data.on;
-  // replace with listeners with .native modifier
-  // so it gets processed during parent component patch.
-  data.on = data.nativeOn;
-
-  if (isTrue(Ctor.options.abstract)) {
-    // abstract components do not keep anything
-    // other than props & listeners & slot
-
-    // work around flow
-    const slot = data.slot;
-    data = {};
-    if (slot) {
-      data.slot = slot;
+  /**
+   * Remove self from all dependencies' subscriber list.
+   */
+  teardown () {
+    if (this.active) {
+      // remove self from vm's watcher list
+      // this is a somewhat expensive operation so we skip it
+      // if the vm is being destroyed.
+      if (!this.vm._isBeingDestroyed) {
+        remove(this.vm._watchers, this);
+      }
+      let i = this.deps.length;
+      while (i--) {
+        this.deps[i].removeSub(this);
+      }
+      this.active = false;
     }
   }
-
-  // install component management hooks onto the placeholder node
-  installComponentHooks(data);
-
-  // return a placeholder vnode
-  const name = Ctor.options.name || tag;
-  const vnode = new VNode(
-    `vue-component-${Ctor.cid}${name ? `-${name}` : ''}`,
-    data, undefined, undefined, undefined, context,
-    { Ctor, propsData, listeners, tag, children },
-    asyncFactory
-  );
-
-  return vnode
 }
 
-function createComponentInstanceForVnode (
-  vnode, // we know it's MountedComponentVNode but flow doesn't
-  parent, // activeInstance in lifecycle state
-) {
-  const options = {
-    _isComponent: true,
-    _parentVnode: vnode,
-    parent
-  };
-  // check inline-template render functions
-  const inlineTemplate = vnode.data.inlineTemplate;
-  if (isDef(inlineTemplate)) {
-    options.render = inlineTemplate.render;
-    options.staticRenderFns = inlineTemplate.staticRenderFns;
-  }
-  return new vnode.componentOptions.Ctor(options)
-}
+/*  */
 
-function installComponentHooks (data) {
-  const hooks = data.hook || (data.hook = {});
-  for (let i = 0; i < hooksToMerge.length; i++) {
-    const key = hooksToMerge[i];
-    const existing = hooks[key];
-    const toMerge = componentVNodeHooks[key];
-    if (existing !== toMerge && !(existing && existing._merged)) {
-      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
-    }
-  }
-}
+const sharedPropertyDefinition = {
+  enumerable: true,
+  configurable: true,
+  get: noop,
+  set: noop
+};
 
-function mergeHook$1 (f1, f2) {
-  const merged = (a, b) => {
-    // flow complains about extra args which is why we use any
-    f1(a, b);
-    f2(a, b);
+function proxy (target, sourceKey, key) {
+  sharedPropertyDefinition.get = function proxyGetter () {
+    return this[sourceKey][key]
   };
-  merged._merged = true;
-  return merged
+  sharedPropertyDefinition.set = function proxySetter (val) {
+    this[sourceKey][key] = val;
+  };
+  Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
-// transform component v-model info (value and callback) into
-// prop and event handler respectively.
-function transformModel (options, data) {
-  const prop = (options.model && options.model.prop) || 'value';
-  const event = (options.model && options.model.event) || 'input'
-  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
-  const on = data.on || (data.on = {});
-  const existing = on[event];
-  const callback = data.model.callback;
-  if (isDef(existing)) {
-    if (
-      Array.isArray(existing)
-        ? existing.indexOf(callback) === -1
-        : existing !== callback
-    ) {
-      on[event] = [callback].concat(existing);
-    }
+function initState (vm) {
+  vm._watchers = [];
+  const opts = vm.$options;
+  if (opts.props) initProps(vm, opts.props);
+  if (opts.methods) initMethods(vm, opts.methods);
+  if (opts.data) {
+    initData(vm);
   } else {
-    on[event] = callback;
+    observe(vm._data = {}, true /* asRootData */);
+  }
+  if (opts.computed) initComputed(vm, opts.computed);
+  if (opts.watch && opts.watch !== nativeWatch) {
+    initWatch(vm, opts.watch);
   }
 }
 
-/*  */
-
-const SIMPLE_NORMALIZE = 1;
-const ALWAYS_NORMALIZE = 2;
-
-// wrapper function for providing a more flexible interface
-// without getting yelled at by flow
-function createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType,
-  alwaysNormalize
-) {
-  if (Array.isArray(data) || isPrimitive(data)) {
-    normalizationType = children;
-    children = data;
-    data = undefined;
+function initProps (vm, propsOptions) {
+  const propsData = vm.$options.propsData || {};
+  const props = vm._props = {};
+  // cache prop keys so that future props updates can iterate using Array
+  // instead of dynamic object key enumeration.
+  const keys = vm.$options._propKeys = [];
+  const isRoot = !vm.$parent;
+  // root instance props should be converted
+  if (!isRoot) {
+    toggleObserving(false);
   }
-  if (isTrue(alwaysNormalize)) {
-    normalizationType = ALWAYS_NORMALIZE;
+  for (const key in propsOptions) {
+    keys.push(key);
+    const value = validateProp(key, propsOptions, propsData, vm);
+    /* istanbul ignore else */
+    {
+      const hyphenatedKey = hyphenate(key);
+      if (isReservedAttribute(hyphenatedKey) ||
+          config.isReservedAttr(hyphenatedKey)) {
+        warn(
+          `"${hyphenatedKey}" is a reserved attribute and cannot be used as component prop.`,
+          vm
+        );
+      }
+      defineReactive$$1(props, key, value, () => {
+        if (!isRoot && !isUpdatingChildComponent) {
+          warn(
+            `Avoid mutating a prop directly since the value will be ` +
+            `overwritten whenever the parent component re-renders. ` +
+            `Instead, use a data or computed property based on the prop's ` +
+            `value. Prop being mutated: "${key}"`,
+            vm
+          );
+        }
+      });
+    }
+    // static props are already proxied on the component's prototype
+    // during Vue.extend(). We only need to proxy props defined at
+    // instantiation here.
+    if (!(key in vm)) {
+      proxy(vm, `_props`, key);
+    }
   }
-  return _createElement(context, tag, data, children, normalizationType)
+  toggleObserving(true);
 }
 
-function _createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType
-) {
-  if (isDef(data) && isDef((data).__ob__)) {
+function initData (vm) {
+  let data = vm.$options.data;
+  data = vm._data = typeof data === 'function'
+    ? getData(data, vm)
+    : data || {};
+  if (!isPlainObject(data)) {
+    data = {};
     warn(
-      `Avoid using observed data object as vnode data: ${JSON.stringify(data)}\n` +
-      'Always create fresh vnode data objects in each render!',
-      context
+      'data functions should return an object:\n' +
+      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+      vm
     );
-    return createEmptyVNode()
-  }
-  // object syntax in v-bind
-  if (isDef(data) && isDef(data.is)) {
-    tag = data.is;
-  }
-  if (!tag) {
-    // in case of component :is set to falsy value
-    return createEmptyVNode()
   }
-  // warn against non-primitive key
-  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-  ) {
+  // proxy data on instance
+  const keys = Object.keys(data);
+  const props = vm.$options.props;
+  const methods = vm.$options.methods;
+  let i = keys.length;
+  while (i--) {
+    const key = keys[i];
     {
+      if (methods && hasOwn(methods, key)) {
+        warn(
+          `Method "${key}" has already been defined as a data property.`,
+          vm
+        );
+      }
+    }
+    if (props && hasOwn(props, key)) {
       warn(
-        'Avoid using non-primitive value as key, ' +
-        'use string/number value instead.',
-        context
+        `The data property "${key}" is already declared as a prop. ` +
+        `Use prop default value instead.`,
+        vm
       );
+    } else if (!isReserved(key)) {
+      proxy(vm, `_data`, key);
     }
   }
-  // support single function children as default scoped slot
-  if (Array.isArray(children) &&
-    typeof children[0] === 'function'
-  ) {
-    data = data || {};
-    data.scopedSlots = { default: children[0] };
-    children.length = 0;
-  }
-  if (normalizationType === ALWAYS_NORMALIZE) {
-    children = normalizeChildren(children);
-  } else if (normalizationType === SIMPLE_NORMALIZE) {
-    children = simpleNormalizeChildren(children);
+  // observe data
+  observe(data, true /* asRootData */);
+}
+
+function getData (data, vm) {
+  // #7573 disable dep collection when invoking data getters
+  pushTarget();
+  try {
+    return data.call(vm, vm)
+  } catch (e) {
+    handleError(e, vm, `data()`);
+    return {}
+  } finally {
+    popTarget();
   }
-  let vnode, ns;
-  if (typeof tag === 'string') {
-    let Ctor;
-    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-    if (config.isReservedTag(tag)) {
-      // platform built-in elements
-      vnode = new VNode(
-        config.parsePlatformTagName(tag), data, children,
-        undefined, undefined, context
+}
+
+const computedWatcherOptions = { lazy: true };
+
+function initComputed (vm, computed) {
+  // $flow-disable-line
+  const watchers = vm._computedWatchers = Object.create(null);
+  // computed properties are just getters during SSR
+  const isSSR = isServerRendering();
+
+  for (const key in computed) {
+    const userDef = computed[key];
+    const getter = typeof userDef === 'function' ? userDef : userDef.get;
+    if (getter == null) {
+      warn(
+        `Getter is missing for computed property "${key}".`,
+        vm
       );
-    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-      // component
-      vnode = createComponent(Ctor, data, context, children, tag);
-    } else {
-      // unknown or unlisted namespaced elements
-      // check at runtime because it may get assigned a namespace when its
-      // parent normalizes children
-      vnode = new VNode(
-        tag, data, children,
-        undefined, undefined, context
+    }
+
+    if (!isSSR) {
+      // create internal watcher for the computed property.
+      watchers[key] = new Watcher(
+        vm,
+        getter || noop,
+        noop,
+        computedWatcherOptions
       );
     }
+
+    // component-defined computed properties are already defined on the
+    // component prototype. We only need to define computed properties defined
+    // at instantiation here.
+    if (!(key in vm)) {
+      defineComputed(vm, key, userDef);
+    } else {
+      if (key in vm.$data) {
+        warn(`The computed property "${key}" is already defined in data.`, vm);
+      } else if (vm.$options.props && key in vm.$options.props) {
+        warn(`The computed property "${key}" is already defined as a prop.`, vm);
+      }
+    }
+  }
+}
+
+function defineComputed (
+  target,
+  key,
+  userDef
+) {
+  const shouldCache = !isServerRendering();
+  if (typeof userDef === 'function') {
+    sharedPropertyDefinition.get = shouldCache
+      ? createComputedGetter(key)
+      : createGetterInvoker(userDef);
+    sharedPropertyDefinition.set = noop;
   } else {
-    // direct component options / constructor
-    vnode = createComponent(tag, data, context, children);
+    sharedPropertyDefinition.get = userDef.get
+      ? shouldCache && userDef.cache !== false
+        ? createComputedGetter(key)
+        : createGetterInvoker(userDef.get)
+      : noop;
+    sharedPropertyDefinition.set = userDef.set || noop;
   }
-  if (Array.isArray(vnode)) {
-    return vnode
-  } else if (isDef(vnode)) {
-    if (isDef(ns)) applyNS(vnode, ns);
-    if (isDef(data)) registerDeepBindings(data);
-    return vnode
-  } else {
-    return createEmptyVNode()
+  if (sharedPropertyDefinition.set === noop) {
+    sharedPropertyDefinition.set = function () {
+      warn(
+        `Computed property "${key}" was assigned to but it has no setter.`,
+        this
+      );
+    };
   }
+  Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
-function applyNS (vnode, ns, force) {
-  vnode.ns = ns;
-  if (vnode.tag === 'foreignObject') {
-    // use default namespace inside foreignObject
-    ns = undefined;
-    force = true;
-  }
-  if (isDef(vnode.children)) {
-    for (let i = 0, l = vnode.children.length; i < l; i++) {
-      const child = vnode.children[i];
-      if (isDef(child.tag) && (
-        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-        applyNS(child, ns, force);
+function createComputedGetter (key) {
+  return function computedGetter () {
+    const watcher = this._computedWatchers && this._computedWatchers[key];
+    if (watcher) {
+      if (watcher.dirty) {
+        watcher.evaluate();
+      }
+      if (Dep.target) {
+        watcher.depend();
       }
+      return watcher.value
     }
   }
 }
 
-// ref #5318
-// necessary to ensure parent re-render when deep bindings like :style and
-// :class are used on slot nodes
-function registerDeepBindings (data) {
-  if (isObject(data.style)) {
-    traverse(data.style);
-  }
-  if (isObject(data.class)) {
-    traverse(data.class);
+function createGetterInvoker(fn) {
+  return function computedGetter () {
+    return fn.call(this, this)
   }
 }
 
-/*  */
-
-function initRender (vm) {
-  vm._vnode = null; // the root of the child tree
-  vm._staticTrees = null; // v-once cached trees
-  const options = vm.$options;
-  const parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
-  const renderContext = parentVnode && parentVnode.context;
-  vm.$slots = resolveSlots(options._renderChildren, renderContext);
-  vm.$scopedSlots = emptyObject;
-  // bind the createElement fn to this instance
-  // so that we get proper render context inside it.
-  // args order: tag, data, children, normalizationType, alwaysNormalize
-  // internal version is used by render functions compiled from templates
-  vm._c = (a, b, c, d) => createElement(vm, a, b, c, d, false);
-  // normalization is always applied for the public version, used in
-  // user-written render functions.
-  vm.$createElement = (a, b, c, d) => createElement(vm, a, b, c, d, true);
+function initMethods (vm, methods) {
+  const props = vm.$options.props;
+  for (const key in methods) {
+    {
+      if (typeof methods[key] !== 'function') {
+        warn(
+          `Method "${key}" has type "${typeof methods[key]}" in the component definition. ` +
+          `Did you reference the function correctly?`,
+          vm
+        );
+      }
+      if (props && hasOwn(props, key)) {
+        warn(
+          `Method "${key}" has already been defined as a prop.`,
+          vm
+        );
+      }
+      if ((key in vm) && isReserved(key)) {
+        warn(
+          `Method "${key}" conflicts with an existing Vue instance method. ` +
+          `Avoid defining component methods that start with _ or $.`
+        );
+      }
+    }
+    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+  }
+}
 
-  // $attrs & $listeners are exposed for easier HOC creation.
-  // they need to be reactive so that HOCs using them are always updated
-  const parentData = parentVnode && parentVnode.data;
+function initWatch (vm, watch) {
+  for (const key in watch) {
+    const handler = watch[key];
+    if (Array.isArray(handler)) {
+      for (let i = 0; i < handler.length; i++) {
+        createWatcher(vm, key, handler[i]);
+      }
+    } else {
+      createWatcher(vm, key, handler);
+    }
+  }
+}
 
-  /* istanbul ignore else */
-  {
-    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, () => {
-      !isUpdatingChildComponent && warn(`$attrs is readonly.`, vm);
-    }, true);
-    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, () => {
-      !isUpdatingChildComponent && warn(`$listeners is readonly.`, vm);
-    }, true);
+function createWatcher (
+  vm,
+  expOrFn,
+  handler,
+  options
+) {
+  if (isPlainObject(handler)) {
+    options = handler;
+    handler = handler.handler;
+  }
+  if (typeof handler === 'string') {
+    handler = vm[handler];
   }
+  return vm.$watch(expOrFn, handler, options)
 }
 
-function renderMixin (Vue) {
-  // install runtime convenience helpers
-  installRenderHelpers(Vue.prototype);
+function stateMixin (Vue) {
+  // flow somehow has problems with directly declared definition object
+  // when using Object.defineProperty, so we have to procedurally build up
+  // the object here.
+  const dataDef = {};
+  dataDef.get = function () { return this._data };
+  const propsDef = {};
+  propsDef.get = function () { return this._props };
+  {
+    dataDef.set = function () {
+      warn(
+        'Avoid replacing instance root $data. ' +
+        'Use nested data properties instead.',
+        this
+      );
+    };
+    propsDef.set = function () {
+      warn(`$props is readonly.`, this);
+    };
+  }
+  Object.defineProperty(Vue.prototype, '$data', dataDef);
+  Object.defineProperty(Vue.prototype, '$props', propsDef);
 
-  Vue.prototype.$nextTick = function (fn) {
-    return nextTick(fn, this)
-  };
+  Vue.prototype.$set = set;
+  Vue.prototype.$delete = del;
 
-  Vue.prototype._render = function () {
+  Vue.prototype.$watch = function (
+    expOrFn,
+    cb,
+    options
+  ) {
     const vm = this;
-    const { render, _parentVnode } = vm.$options;
-
-    if (_parentVnode) {
-      vm.$scopedSlots = normalizeScopedSlots(
-        _parentVnode.data.scopedSlots,
-        vm.$slots
-      );
+    if (isPlainObject(cb)) {
+      return createWatcher(vm, expOrFn, cb, options)
     }
-
-    // set parent vnode. this allows render functions to have access
-    // to the data on the placeholder node.
-    vm.$vnode = _parentVnode;
-    // render self
-    let vnode;
-    try {
-      vnode = render.call(vm._renderProxy, vm.$createElement);
-    } catch (e) {
-      handleError(e, vm, `render`);
-      // return error render result,
-      // or previous vnode to prevent render error causing blank component
-      /* istanbul ignore else */
-      if (vm.$options.renderError) {
-        try {
-          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
-        } catch (e) {
-          handleError(e, vm, `renderError`);
-          vnode = vm._vnode;
-        }
-      } else {
-        vnode = vm._vnode;
+    options = options || {};
+    options.user = true;
+    const watcher = new Watcher(vm, expOrFn, cb, options);
+    if (options.immediate) {
+      try {
+        cb.call(vm, watcher.value);
+      } catch (error) {
+        handleError(error, vm, `callback for immediate watcher "${watcher.expression}"`);
       }
     }
-    // if the returned array contains only a single node, allow it
-    if (Array.isArray(vnode) && vnode.length === 1) {
-      vnode = vnode[0];
-    }
-    // return empty vnode in case the render function errored out
-    if (!(vnode instanceof VNode)) {
-      if (Array.isArray(vnode)) {
-        warn(
-          'Multiple root nodes returned from render function. Render function ' +
-          'should return a single root node.',
-          vm
-        );
-      }
-      vnode = createEmptyVNode();
+    return function unwatchFn () {
+      watcher.teardown();
     }
-    // set parent
-    vnode.parent = _parentVnode;
-    return vnode
   };
 }
 
@@ -5359,7 +5364,7 @@ Object.defineProperty(Vue, 'FunctionalRenderContext', {
   value: FunctionalRenderContext
 });
 
-Vue.version = '2.6.2';
+Vue.version = '2.6.3';
 
 /*  */
 
@@ -7415,6 +7420,11 @@ function createOnceHandler$1 (event, handler, capture) {
   }
 }
 
+// #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+// implementation and does not fire microtasks in between event propagation, so
+// safe to exclude.
+const useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
 function add$1 (
   name,
   handler,
@@ -7427,11 +7437,16 @@ function add$1 (
   // the solution is simple: we save the timestamp when a handler is attached,
   // and the handler would only fire if the event passed to it was fired
   // AFTER it was attached.
-  if (isUsingMicroTask) {
+  if (useMicrotaskFix) {
     const attachedTimestamp = currentFlushTimestamp;
     const original = handler;
     handler = original._wrapper = function (e) {
-      if (e.timeStamp >= attachedTimestamp) {
+      if (
+        e.timeStamp >= attachedTimestamp ||
+        // #9448 bail if event is fired in another document in a multi-page
+        // electron/nw.js app
+        e.target.ownerDocument !== document
+      ) {
         return original.apply(this, arguments)
       }
     };
@@ -9437,6 +9452,8 @@ const invalidAttributeRE = /[\s"'<>\/=]/;
 
 const decodeHTMLCached = cached(he.decode);
 
+const emptySlotScopeToken = `_empty_`;
+
 // configurable state
 let warn$2;
 let delimiters;
@@ -10047,7 +10064,7 @@ function processSlotContent (el) {
         const { name, dynamic } = getSlotName(slotBinding);
         el.slotTarget = name;
         el.slotTargetDynamic = dynamic;
-        el.slotScope = slotBinding.value || `_`; // force it into a scoped slot for perf
+        el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
       }
     } else {
       // v-slot on component, denotes default slot
@@ -10080,8 +10097,13 @@ function processSlotContent (el) {
         const slotContainer = slots[name] = createASTElement('template', [], el);
         slotContainer.slotTarget = name;
         slotContainer.slotTargetDynamic = dynamic;
-        slotContainer.children = el.children.filter(c => !(c).slotScope);
-        slotContainer.slotScope = slotBinding.value || `_`;
+        slotContainer.children = el.children.filter((c) => {
+          if (!c.slotScope) {
+            c.parent = slotContainer;
+            return true
+          }
+        });
+        slotContainer.slotScope = slotBinding.value || emptySlotScopeToken;
         // remove children as they are returned from scopedSlots now
         el.children = [];
         // mark el non-plain so data gets generated
@@ -11040,7 +11062,7 @@ function genData$2 (el, state) {
   }
   // scoped slots
   if (el.scopedSlots) {
-    data += `${genScopedSlots(el.scopedSlots, state)},`;
+    data += `${genScopedSlots(el, el.scopedSlots, state)},`;
   }
   // component v-model
   if (el.model) {
@@ -11127,18 +11149,36 @@ function genInlineTemplate (el, state) {
 }
 
 function genScopedSlots (
+  el,
   slots,
   state
 ) {
-  const hasDynamicKeys = Object.keys(slots).some(key => {
+  // by default scoped slots are considered "stable", this allows child
+  // components with only scoped slots to skip forced updates from parent.
+  // but in some cases we have to bail-out of this optimization
+  // for example if the slot contains dynamic names, has v-if or v-for on them...
+  let needsForceUpdate = Object.keys(slots).some(key => {
     const slot = slots[key];
     return slot.slotTargetDynamic || slot.if || slot.for
   });
+  // OR when it is inside another scoped slot (the reactivity is disconnected)
+  // #9438
+  if (!needsForceUpdate) {
+    let parent = el.parent;
+    while (parent) {
+      if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+        needsForceUpdate = true;
+        break
+      }
+      parent = parent.parent;
+    }
+  }
+
   return `scopedSlots:_u([${
     Object.keys(slots).map(key => {
       return genScopedSlot(slots[key], state)
     }).join(',')
-  }]${hasDynamicKeys ? `,true` : ``})`
+  }]${needsForceUpdate ? `,true` : ``})`
 }
 
 function genScopedSlot (
@@ -11152,7 +11192,10 @@ function genScopedSlot (
   if (el.for && !el.forProcessed) {
     return genFor(el, state, genScopedSlot)
   }
-  const fn = `function(${String(el.slotScope)}){` +
+  const slotScope = el.slotScope === emptySlotScopeToken
+    ? ``
+    : String(el.slotScope);
+  const fn = `function(${slotScope}){` +
     `return ${el.tag === 'template'
       ? el.if && isLegacySyntax
         ? `(${el.if})?${genChildren(el, state) || 'undefined'}:undefined`
@@ -11249,7 +11292,14 @@ function genSlot (el, state) {
   const slotName = el.slotName || '"default"';
   const children = genChildren(el, state);
   let res = `_t(${slotName}${children ? `,${children}` : ''}`;
-  const attrs = el.attrs && `{${el.attrs.map(a => `${camelize(a.name)}:${a.value}`).join(',')}}`;
+  const attrs = el.attrs || el.dynamicAttrs
+    ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(attr => ({
+        // slot props are camelized
+        name: camelize(attr.name),
+        value: attr.value,
+        dynamic: attr.dynamic
+      })))
+    : null;
   const bind$$1 = el.attrsMap['v-bind'];
   if ((attrs || bind$$1) && !children) {
     res += `,null`;
diff --git a/dist/vue.esm.browser.min.js b/dist/vue.esm.browser.min.js
index 111e977f8f0..79137b9abf3 100644
--- a/dist/vue.esm.browser.min.js
+++ b/dist/vue.esm.browser.min.js
@@ -1,6 +1,6 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
-const t=Object.freeze({});function e(t){return null==t}function n(t){return null!=t}function o(t){return!0===t}function r(t){return"string"==typeof t||"number"==typeof t||"symbol"==typeof t||"boolean"==typeof t}function s(t){return null!==t&&"object"==typeof t}const i=Object.prototype.toString;function a(t){return"[object Object]"===i.call(t)}function c(t){const e=parseFloat(String(t));return e>=0&&Math.floor(e)===e&&isFinite(t)}function l(t){return n(t)&&"function"==typeof t.then&&"function"==typeof t.catch}function u(t){return null==t?"":Array.isArray(t)||a(t)&&t.toString===i?JSON.stringify(t,null,2):String(t)}function f(t){const e=parseFloat(t);return isNaN(e)?t:e}function d(t,e){const n=Object.create(null),o=t.split(",");for(let t=0;t<o.length;t++)n[o[t]]=!0;return e?t=>n[t.toLowerCase()]:t=>n[t]}const p=d("slot,component",!0),h=d("key,ref,slot,slot-scope,is");function m(t,e){if(t.length){const n=t.indexOf(e);if(n>-1)return t.splice(n,1)}}const g=Object.prototype.hasOwnProperty;function y(t,e){return g.call(t,e)}function v(t){const e=Object.create(null);return function(n){return e[n]||(e[n]=t(n))}}const $=/-(\w)/g,_=v(t=>t.replace($,(t,e)=>e?e.toUpperCase():"")),b=v(t=>t.charAt(0).toUpperCase()+t.slice(1)),w=/\B([A-Z])/g,C=v(t=>t.replace(w,"-$1").toLowerCase());const x=Function.prototype.bind?function(t,e){return t.bind(e)}:function(t,e){function n(n){const o=arguments.length;return o?o>1?t.apply(e,arguments):t.call(e,n):t.call(e)}return n._length=t.length,n};function A(t,e){e=e||0;let n=t.length-e;const o=new Array(n);for(;n--;)o[n]=t[n+e];return o}function k(t,e){for(const n in e)t[n]=e[n];return t}function O(t){const e={};for(let n=0;n<t.length;n++)t[n]&&k(e,t[n]);return e}function S(t,e,n){}const T=(t,e,n)=>!1,E=t=>t;function N(t,e){if(t===e)return!0;const n=s(t),o=s(e);if(!n||!o)return!n&&!o&&String(t)===String(e);try{const n=Array.isArray(t),o=Array.isArray(e);if(n&&o)return t.length===e.length&&t.every((t,n)=>N(t,e[n]));if(t instanceof Date&&e instanceof Date)return t.getTime()===e.getTime();if(n||o)return!1;{const n=Object.keys(t),o=Object.keys(e);return n.length===o.length&&n.every(n=>N(t[n],e[n]))}}catch(t){return!1}}function j(t,e){for(let n=0;n<t.length;n++)if(N(t[n],e))return n;return-1}function L(t){let e=!1;return function(){e||(e=!0,t.apply(this,arguments))}}const M="data-server-rendered",I=["component","directive","filter"],D=["beforeCreate","created","beforeMount","mounted","beforeUpdate","updated","beforeDestroy","destroyed","activated","deactivated","errorCaptured","serverPrefetch"];var P={optionMergeStrategies:Object.create(null),silent:!1,productionTip:!1,devtools:!1,performance:!1,errorHandler:null,warnHandler:null,ignoredElements:[],keyCodes:Object.create(null),isReservedTag:T,isReservedAttr:T,isUnknownElement:T,getTagNamespace:S,parsePlatformTagName:E,mustUseProp:T,async:!0,_lifecycleHooks:D};function R(t){const e=(t+"").charCodeAt(0);return 36===e||95===e}function F(t,e,n,o){Object.defineProperty(t,e,{value:n,enumerable:!!o,writable:!0,configurable:!0})}const H=new RegExp("[^a-zA-Z\xb7\xc0-\xd6\xd8-\xf6\xf8-\u037d\u037f-\u1fff\u200c-\u200d\u203f-\u2040\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff\uf900-\ufdcf\ufdf0-\ufffd.$_\\d]");const B="__proto__"in{},U="undefined"!=typeof window,z="undefined"!=typeof WXEnvironment&&!!WXEnvironment.platform,V=z&&WXEnvironment.platform.toLowerCase(),K=U&&window.navigator.userAgent.toLowerCase(),J=K&&/msie|trident/.test(K),q=K&&K.indexOf("msie 9.0")>0,W=K&&K.indexOf("edge/")>0,Z=(K&&K.indexOf("android"),K&&/iphone|ipad|ipod|ios/.test(K)||"ios"===V),G=(K&&/chrome\/\d+/.test(K),K&&/phantomjs/.test(K),{}.watch);let X,Y=!1;if(U)try{const t={};Object.defineProperty(t,"passive",{get(){Y=!0}}),window.addEventListener("test-passive",null,t)}catch(t){}const Q=()=>(void 0===X&&(X=!U&&!z&&"undefined"!=typeof global&&(global.process&&"server"===global.process.env.VUE_ENV)),X),tt=U&&window.__VUE_DEVTOOLS_GLOBAL_HOOK__;function et(t){return"function"==typeof t&&/native code/.test(t.toString())}const nt="undefined"!=typeof Symbol&&et(Symbol)&&"undefined"!=typeof Reflect&&et(Reflect.ownKeys);let ot;ot="undefined"!=typeof Set&&et(Set)?Set:class{constructor(){this.set=Object.create(null)}has(t){return!0===this.set[t]}add(t){this.set[t]=!0}clear(){this.set=Object.create(null)}};let rt=S,st=0;class it{constructor(){this.id=st++,this.subs=[]}addSub(t){this.subs.push(t)}removeSub(t){m(this.subs,t)}depend(){it.target&&it.target.addDep(this)}notify(){const t=this.subs.slice();for(let e=0,n=t.length;e<n;e++)t[e].update()}}it.target=null;const at=[];function ct(t){at.push(t),it.target=t}function lt(){at.pop(),it.target=at[at.length-1]}class ut{constructor(t,e,n,o,r,s,i,a){this.tag=t,this.data=e,this.children=n,this.text=o,this.elm=r,this.ns=void 0,this.context=s,this.fnContext=void 0,this.fnOptions=void 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t(e){e.static=function(t){if(2===t.type)return!1;if(3===t.type)return!0;return!(!t.pre&&(t.hasBindings||t.if||t.for||p(t.tag)||!yi(t.tag)||function(t){for(;t.parent;){if("template"!==(t=t.parent).tag)return!1;if(t.for)return!0}return!1}(t)||!Object.keys(t).every(mi)))}(e);if(1===e.type){if(!yi(e.tag)&&"slot"!==e.tag&&null==e.attrsMap["inline-template"])return;for(let n=0,o=e.children.length;n<o;n++){const o=e.children[n];t(o),o.static||(e.static=!1)}if(e.ifConditions)for(let n=1,o=e.ifConditions.length;n<o;n++){const o=e.ifConditions[n].block;t(o),o.static||(e.static=!1)}}}(t),function t(e,n){if(1===e.type){if((e.static||e.once)&&(e.staticInFor=n),e.static&&e.children.length&&(1!==e.children.length||3!==e.children[0].type))return void(e.staticRoot=!0);if(e.staticRoot=!1,e.children)for(let o=0,r=e.children.length;o<r;o++)t(e.children[o],n||!!e.for);if(e.ifConditions)for(let o=1,r=e.ifConditions.length;o<r;o++)t(e.ifConditions[o].block,n)}}(t,!1))}const $i=/^([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/,_i=/\([^)]*?\);*$/,bi=/^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/,wi={esc:27,tab:9,enter:13,space:32,up:38,left:37,right:39,down:40,delete:[8,46]},Ci={esc:["Esc","Escape"],tab:"Tab",enter:"Enter",space:[" ","Spacebar"],up:["Up","ArrowUp"],left:["Left","ArrowLeft"],right:["Right","ArrowRight"],down:["Down","ArrowDown"],delete:["Backspace","Delete","Del"]},xi=t=>`if(${t})return null;`,Ai={stop:"$event.stopPropagation();",prevent:"$event.preventDefault();",self:xi("$event.target !== $event.currentTarget"),ctrl:xi("!$event.ctrlKey"),shift:xi("!$event.shiftKey"),alt:xi("!$event.altKey"),meta:xi("!$event.metaKey"),left:xi("'button' in $event && $event.button !== 0"),middle:xi("'button' in $event && $event.button !== 1"),right:xi("'button' in $event && $event.button !== 2")};function ki(t,e){const n=e?"nativeOn:":"on:";let o="",r="";for(const e in t){const n=Oi(t[e]);t[e]&&t[e].dynamic?r+=`${e},${n},`:o+=`"${e}":${n},`}return o=`{${o.slice(0,-1)}}`,r?n+`_d(${o},[${r.slice(0,-1)}])`:n+o}function Oi(t){if(!t)return"function(){}";if(Array.isArray(t))return`[${t.map(t=>Oi(t)).join(",")}]`;const e=bi.test(t.value),n=$i.test(t.value),o=bi.test(t.value.replace(_i,""));if(t.modifiers){let r="",s="";const i=[];for(const e in t.modifiers)if(Ai[e])s+=Ai[e],wi[e]&&i.push(e);else if("exact"===e){const e=t.modifiers;s+=xi(["ctrl","shift","alt","meta"].filter(t=>!e[t]).map(t=>`$event.${t}Key`).join("||"))}else i.push(e);return i.length&&(r+=function(t){return`if(('keyCode' in $event)&&${t.map(Si).join("&&")})return null;`}(i)),s&&(r+=s),`function($event){${r}${e?`return ${t.value}($event)`:n?`return (${t.value})($event)`:o?`return ${t.value}`:t.value}}`}return e||n?t.value:`function($event){${o?`return ${t.value}`:t.value}}`}function Si(t){const e=parseInt(t,10);if(e)return`$event.keyCode!==${e}`;const n=wi[t],o=Ci[t];return"_k($event.keyCode,"+`${JSON.stringify(t)},`+`${JSON.stringify(n)},`+"$event.key,"+`${JSON.stringify(o)}`+")"}var Ti={on:function(t,e){t.wrapListeners=(t=>`_g(${t},${e.value})`)},bind:function(t,e){t.wrapData=(n=>`_b(${n},'${t.tag}',${e.value},${e.modifiers&&e.modifiers.prop?"true":"false"}${e.modifiers&&e.modifiers.sync?",true":""})`)},cloak:S};class Ei{constructor(t){this.options=t,this.warn=t.warn||yo,this.transforms=go(t.modules,"transformCode"),this.dataGenFns=go(t.modules,"genData"),this.directives=k(k({},Ti),t.directives);const e=t.isReservedTag||T;this.maybeComponent=(t=>!!t.component||!e(t.tag)),this.onceId=0,this.staticRenderFns=[],this.pre=!1}}function Ni(t,e){const n=new Ei(e);return{render:`with(this){return ${t?ji(t,n):'_c("div")'}}`,staticRenderFns:n.staticRenderFns}}function ji(t,e){if(t.parent&&(t.pre=t.pre||t.parent.pre),t.staticRoot&&!t.staticProcessed)return Li(t,e);if(t.once&&!t.onceProcessed)return Mi(t,e);if(t.for&&!t.forProcessed)return Di(t,e);if(t.if&&!t.ifProcessed)return Ii(t,e);if("template"!==t.tag||t.slotTarget||e.pre){if("slot"===t.tag)return function(t,e){const n=t.slotName||'"default"',o=Fi(t,e);let r=`_t(${n}${o?`,${o}`:""}`;const s=t.attrs||t.dynamicAttrs?Ui((t.attrs||[]).concat(t.dynamicAttrs||[]).map(t=>({name:_(t.name),value:t.value,dynamic:t.dynamic}))):null,i=t.attrsMap["v-bind"];!s&&!i||o||(r+=",null");s&&(r+=`,${s}`);i&&(r+=`${s?"":",null"},${i}`);return r+")"}(t,e);{let n;if(t.component)n=function(t,e,n){const o=e.inlineTemplate?null:Fi(e,n,!0);return`_c(${t},${Pi(e,n)}${o?`,${o}`:""})`}(t.component,t,e);else{let o;(!t.plain||t.pre&&e.maybeComponent(t))&&(o=Pi(t,e));const r=t.inlineTemplate?null:Fi(t,e,!0);n=`_c('${t.tag}'${o?`,${o}`:""}${r?`,${r}`:""})`}for(let o=0;o<e.transforms.length;o++)n=e.transforms[o](t,n);return n}}return Fi(t,e)||"void 0"}function Li(t,e){t.staticProcessed=!0;const n=e.pre;return t.pre&&(e.pre=t.pre),e.staticRenderFns.push(`with(this){return ${ji(t,e)}}`),e.pre=n,`_m(${e.staticRenderFns.length-1}${t.staticInFor?",true":""})`}function Mi(t,e){if(t.onceProcessed=!0,t.if&&!t.ifProcessed)return Ii(t,e);if(t.staticInFor){let n="",o=t.parent;for(;o;){if(o.for){n=o.key;break}o=o.parent}return n?`_o(${ji(t,e)},${e.onceId++},${n})`:ji(t,e)}return Li(t,e)}function Ii(t,e,n,o){return t.ifProcessed=!0,function t(e,n,o,r){if(!e.length)return r||"_e()";const s=e.shift();return s.exp?`(${s.exp})?${i(s.block)}:${t(e,n,o,r)}`:`${i(s.block)}`;function i(t){return o?o(t,n):t.once?Mi(t,n):ji(t,n)}}(t.ifConditions.slice(),e,n,o)}function Di(t,e,n,o){const r=t.for,s=t.alias,i=t.iterator1?`,${t.iterator1}`:"",a=t.iterator2?`,${t.iterator2}`:"";return t.forProcessed=!0,`${o||"_l"}((${r}),`+`function(${s}${i}${a}){`+`return ${(n||ji)(t,e)}`+"})"}function Pi(t,e){let n="{";const o=function(t,e){const n=t.directives;if(!n)return;let o,r,s,i,a="directives:[",c=!1;for(o=0,r=n.length;o<r;o++){s=n[o],i=!0;const r=e.directives[s.name];r&&(i=!!r(t,s,e.warn)),i&&(c=!0,a+=`{name:"${s.name}",rawName:"${s.rawName}"${s.value?`,value:(${s.value}),expression:${JSON.stringify(s.value)}`:""}${s.arg?`,arg:${s.isDynamicArg?s.arg:`"${s.arg}"`}`:""}${s.modifiers?`,modifiers:${JSON.stringify(s.modifiers)}`:""}},`)}if(c)return a.slice(0,-1)+"]"}(t,e);o&&(n+=o+","),t.key&&(n+=`key:${t.key},`),t.ref&&(n+=`ref:${t.ref},`),t.refInFor&&(n+="refInFor:true,"),t.pre&&(n+="pre:true,"),t.component&&(n+=`tag:"${t.tag}",`);for(let o=0;o<e.dataGenFns.length;o++)n+=e.dataGenFns[o](t);if(t.attrs&&(n+=`attrs:${Ui(t.attrs)},`),t.props&&(n+=`domProps:${Ui(t.props)},`),t.events&&(n+=`${ki(t.events,!1)},`),t.nativeEvents&&(n+=`${ki(t.nativeEvents,!0)},`),t.slotTarget&&!t.slotScope&&(n+=`slot:${t.slotTarget},`),t.scopedSlots&&(n+=`${function(t,e,n){let o=Object.keys(e).some(t=>{const n=e[t];return n.slotTargetDynamic||n.if||n.for});if(!o){let e=t.parent;for(;e;){if(e.slotScope&&e.slotScope!==qs){o=!0;break}e=e.parent}}return`scopedSlots:_u([${Object.keys(e).map(t=>Ri(e[t],n)).join(",")}]${o?",true":""})`}(t,t.scopedSlots,e)},`),t.model&&(n+=`model:{value:${t.model.value},callback:${t.model.callback},expression:${t.model.expression}},`),t.inlineTemplate){const o=function(t,e){const n=t.children[0];if(n&&1===n.type){const t=Ni(n,e.options);return`inlineTemplate:{render:function(){${t.render}},staticRenderFns:[${t.staticRenderFns.map(t=>`function(){${t}}`).join(",")}]}`}}(t,e);o&&(n+=`${o},`)}return n=n.replace(/,$/,"")+"}",t.dynamicAttrs&&(n=`_b(${n},"${t.tag}",${Ui(t.dynamicAttrs)})`),t.wrapData&&(n=t.wrapData(n)),t.wrapListeners&&(n=t.wrapListeners(n)),n}function Ri(t,e){const n=t.attrsMap["slot-scope"];if(t.if&&!t.ifProcessed&&!n)return Ii(t,e,Ri,"null");if(t.for&&!t.forProcessed)return Di(t,e,Ri);const o=`function(${t.slotScope===qs?"":String(t.slotScope)}){`+`return ${"template"===t.tag?t.if&&n?`(${t.if})?${Fi(t,e)||"undefined"}:undefined`:Fi(t,e)||"undefined":ji(t,e)}}`;return`{key:${t.slotTarget||'"default"'},fn:${o}}`}function Fi(t,e,n,o,r){const s=t.children;if(s.length){const t=s[0];if(1===s.length&&t.for&&"template"!==t.tag&&"slot"!==t.tag){const r=n?e.maybeComponent(t)?",1":",0":"";return`${(o||ji)(t,e)}${r}`}const i=n?function(t,e){let n=0;for(let o=0;o<t.length;o++){const r=t[o];if(1===r.type){if(Hi(r)||r.ifConditions&&r.ifConditions.some(t=>Hi(t.block))){n=2;break}(e(r)||r.ifConditions&&r.ifConditions.some(t=>e(t.block)))&&(n=1)}}return n}(s,e.maybeComponent):0,a=r||Bi;return`[${s.map(t=>a(t,e)).join(",")}]${i?`,${i}`:""}`}}function Hi(t){return void 0!==t.for||"template"===t.tag||"slot"===t.tag}function Bi(t,e){return 1===t.type?ji(t,e):3===t.type&&t.isComment?(o=t,`_e(${JSON.stringify(o.text)})`):`_v(${2===(n=t).type?n.expression:zi(JSON.stringify(n.text))})`;var n,o}function Ui(t){let e="",n="";for(let o=0;o<t.length;o++){const r=t[o],s=zi(r.value);r.dynamic?n+=`${r.name},${s},`:e+=`"${r.name}":${s},`}return e=`{${e.slice(0,-1)}}`,n?`_d(${e},[${n.slice(0,-1)}])`:e}function zi(t){return t.replace(/\u2028/g,"\\u2028").replace(/\u2029/g,"\\u2029")}new RegExp("\\b"+"do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,super,throw,while,yield,delete,export,import,return,switch,default,extends,finally,continue,debugger,function,arguments".split(",").join("\\b|\\b")+"\\b");function Vi(t,e){try{return new Function(t)}catch(n){return e.push({err:n,code:t}),S}}function Ki(t){const e=Object.create(null);return function(n,o,r){(o=k({},o)).warn;delete o.warn;const s=o.delimiters?String(o.delimiters)+n:n;if(e[s])return e[s];const i=t(n,o),a={},c=[];return a.render=Vi(i.render,c),a.staticRenderFns=i.staticRenderFns.map(t=>Vi(t,c)),e[s]=a}}const Ji=(qi=function(t,e){const n=oi(t.trim(),e);!1!==e.optimize&&vi(n,e);const o=Ni(n,e);return{ast:n,render:o.render,staticRenderFns:o.staticRenderFns}},function(t){function e(e,n){const o=Object.create(t),r=[],s=[];if(n){n.modules&&(o.modules=(t.modules||[]).concat(n.modules)),n.directives&&(o.directives=k(Object.create(t.directives||null),n.directives));for(const t in n)"modules"!==t&&"directives"!==t&&(o[t]=n[t])}o.warn=((t,e,n)=>{(n?s:r).push(t)});const i=qi(e.trim(),o);return i.errors=r,i.tips=s,i}return{compile:e,compileToFunctions:Ki(e)}});var qi;const{compile:Wi,compileToFunctions:Zi}=Ji(hi);let Gi;function Xi(t){return(Gi=Gi||document.createElement("div")).innerHTML=t?'<a href="\n"/>':'<div a="\n"/>',Gi.innerHTML.indexOf("&#10;")>0}const Yi=!!U&&Xi(!1),Qi=!!U&&Xi(!0),ta=v(t=>{const e=Kn(t);return e&&e.innerHTML}),ea=mn.prototype.$mount;mn.prototype.$mount=function(t,e){if((t=t&&Kn(t))===document.body||t===document.documentElement)return this;const n=this.$options;if(!n.render){let e=n.template;if(e)if("string"==typeof e)"#"===e.charAt(0)&&(e=ta(e));else{if(!e.nodeType)return this;e=e.innerHTML}else t&&(e=function(t){if(t.outerHTML)return t.outerHTML;{const e=document.createElement("div");return e.appendChild(t.cloneNode(!0)),e.innerHTML}}(t));if(e){const{render:t,staticRenderFns:o}=Zi(e,{outputSourceRange:!1,shouldDecodeNewlines:Yi,shouldDecodeNewlinesForHref:Qi,delimiters:n.delimiters,comments:n.comments},this);n.render=t,n.staticRenderFns=o}}return ea.call(this,t,e)},mn.compile=Zi;export default mn;
\ No newline at end of file
diff --git a/dist/vue.esm.js b/dist/vue.esm.js
index 81b2c0623ad..df1fb691f77 100644
--- a/dist/vue.esm.js
+++ b/dist/vue.esm.js
@@ -1,5 +1,5 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
@@ -532,6 +532,7 @@ var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android'
 var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
 var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 var isPhantomJS = UA && /phantomjs/.test(UA);
+var isFF = UA && UA.match(/firefox\/(\d+)/);
 
 // Firefox has a "watch" function on Object.prototype...
 var nativeWatch = ({}).watch;
@@ -2408,2450 +2409,2452 @@ function normalizeArrayChildren (children, nestedIndex) {
 
 /*  */
 
-function ensureCtor (comp, base) {
-  if (
-    comp.__esModule ||
-    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-  ) {
-    comp = comp.default;
+function initProvide (vm) {
+  var provide = vm.$options.provide;
+  if (provide) {
+    vm._provided = typeof provide === 'function'
+      ? provide.call(vm)
+      : provide;
   }
-  return isObject(comp)
-    ? base.extend(comp)
-    : comp
-}
-
-function createAsyncPlaceholder (
-  factory,
-  data,
-  context,
-  children,
-  tag
-) {
-  var node = createEmptyVNode();
-  node.asyncFactory = factory;
-  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-  return node
 }
 
-function resolveAsyncComponent (
-  factory,
-  baseCtor,
-  context
-) {
-  if (isTrue(factory.error) && isDef(factory.errorComp)) {
-    return factory.errorComp
-  }
-
-  if (isDef(factory.resolved)) {
-    return factory.resolved
-  }
-
-  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-    return factory.loadingComp
-  }
-
-  if (isDef(factory.contexts)) {
-    // already pending
-    factory.contexts.push(context);
-  } else {
-    var contexts = factory.contexts = [context];
-    var sync = true;
-
-    var forceRender = function (renderCompleted) {
-      for (var i = 0, l = contexts.length; i < l; i++) {
-        contexts[i].$forceUpdate();
-      }
-
-      if (renderCompleted) {
-        contexts.length = 0;
-      }
-    };
-
-    var resolve = once(function (res) {
-      // cache resolved
-      factory.resolved = ensureCtor(res, baseCtor);
-      // invoke callbacks only if this is not a synchronous resolve
-      // (async resolves are shimmed as synchronous during SSR)
-      if (!sync) {
-        forceRender(true);
+function initInjections (vm) {
+  var result = resolveInject(vm.$options.inject, vm);
+  if (result) {
+    toggleObserving(false);
+    Object.keys(result).forEach(function (key) {
+      /* istanbul ignore else */
+      if (process.env.NODE_ENV !== 'production') {
+        defineReactive$$1(vm, key, result[key], function () {
+          warn(
+            "Avoid mutating an injected value directly since the changes will be " +
+            "overwritten whenever the provided component re-renders. " +
+            "injection being mutated: \"" + key + "\"",
+            vm
+          );
+        });
       } else {
-        contexts.length = 0;
-      }
-    });
-
-    var reject = once(function (reason) {
-      process.env.NODE_ENV !== 'production' && warn(
-        "Failed to resolve async component: " + (String(factory)) +
-        (reason ? ("\nReason: " + reason) : '')
-      );
-      if (isDef(factory.errorComp)) {
-        factory.error = true;
-        forceRender(true);
+        defineReactive$$1(vm, key, result[key]);
       }
     });
+    toggleObserving(true);
+  }
+}
 
-    var res = factory(resolve, reject);
-
-    if (isObject(res)) {
-      if (isPromise(res)) {
-        // () => Promise
-        if (isUndef(factory.resolved)) {
-          res.then(resolve, reject);
-        }
-      } else if (isPromise(res.component)) {
-        res.component.then(resolve, reject);
-
-        if (isDef(res.error)) {
-          factory.errorComp = ensureCtor(res.error, baseCtor);
-        }
+function resolveInject (inject, vm) {
+  if (inject) {
+    // inject is :any because flow is not smart enough to figure out cached
+    var result = Object.create(null);
+    var keys = hasSymbol
+      ? Reflect.ownKeys(inject)
+      : Object.keys(inject);
 
-        if (isDef(res.loading)) {
-          factory.loadingComp = ensureCtor(res.loading, baseCtor);
-          if (res.delay === 0) {
-            factory.loading = true;
-          } else {
-            setTimeout(function () {
-              if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                factory.loading = true;
-                forceRender(false);
-              }
-            }, res.delay || 200);
-          }
+    for (var i = 0; i < keys.length; i++) {
+      var key = keys[i];
+      // #6574 in case the inject object is observed...
+      if (key === '__ob__') { continue }
+      var provideKey = inject[key].from;
+      var source = vm;
+      while (source) {
+        if (source._provided && hasOwn(source._provided, provideKey)) {
+          result[key] = source._provided[provideKey];
+          break
         }
-
-        if (isDef(res.timeout)) {
-          setTimeout(function () {
-            if (isUndef(factory.resolved)) {
-              reject(
-                process.env.NODE_ENV !== 'production'
-                  ? ("timeout (" + (res.timeout) + "ms)")
-                  : null
-              );
-            }
-          }, res.timeout);
+        source = source.$parent;
+      }
+      if (!source) {
+        if ('default' in inject[key]) {
+          var provideDefault = inject[key].default;
+          result[key] = typeof provideDefault === 'function'
+            ? provideDefault.call(vm)
+            : provideDefault;
+        } else if (process.env.NODE_ENV !== 'production') {
+          warn(("Injection \"" + key + "\" not found"), vm);
         }
       }
     }
-
-    sync = false;
-    // return in case resolved synchronously
-    return factory.loading
-      ? factory.loadingComp
-      : factory.resolved
+    return result
   }
 }
 
 /*  */
 
-function isAsyncPlaceholder (node) {
-  return node.isComment && node.asyncFactory
-}
 
-/*  */
 
-function getFirstComponentChild (children) {
-  if (Array.isArray(children)) {
-    for (var i = 0; i < children.length; i++) {
-      var c = children[i];
-      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
-        return c
+/**
+ * Runtime helper for resolving raw children VNodes into a slot object.
+ */
+function resolveSlots (
+  children,
+  context
+) {
+  if (!children || !children.length) {
+    return {}
+  }
+  var slots = {};
+  for (var i = 0, l = children.length; i < l; i++) {
+    var child = children[i];
+    var data = child.data;
+    // remove slot attribute if the node is resolved as a Vue slot node
+    if (data && data.attrs && data.attrs.slot) {
+      delete data.attrs.slot;
+    }
+    // named slots should only be respected if the vnode was rendered in the
+    // same context.
+    if ((child.context === context || child.fnContext === context) &&
+      data && data.slot != null
+    ) {
+      var name = data.slot;
+      var slot = (slots[name] || (slots[name] = []));
+      if (child.tag === 'template') {
+        slot.push.apply(slot, child.children || []);
+      } else {
+        slot.push(child);
       }
+    } else {
+      (slots.default || (slots.default = [])).push(child);
+    }
+  }
+  // ignore slots that contains only whitespace
+  for (var name$1 in slots) {
+    if (slots[name$1].every(isWhitespace)) {
+      delete slots[name$1];
     }
   }
+  return slots
 }
 
-/*  */
+function isWhitespace (node) {
+  return (node.isComment && !node.asyncFactory) || node.text === ' '
+}
 
 /*  */
 
-function initEvents (vm) {
-  vm._events = Object.create(null);
-  vm._hasHookEvent = false;
-  // init parent attached events
-  var listeners = vm.$options._parentListeners;
-  if (listeners) {
-    updateComponentListeners(vm, listeners);
+function normalizeScopedSlots (
+  slots,
+  normalSlots
+) {
+  var res;
+  if (!slots) {
+    res = {};
+  } else if (slots._normalized) {
+    return slots
+  } else {
+    res = {};
+    for (var key in slots) {
+      if (slots[key] && key[0] !== '$') {
+        res[key] = normalizeScopedSlot(slots[key]);
+      }
+    }
+  }
+  // expose normal slots on scopedSlots
+  for (var key$1 in normalSlots) {
+    if (!(key$1 in res)) {
+      res[key$1] = proxyNormalSlot(normalSlots, key$1);
+    }
   }
+  def(res, '_normalized', true);
+  def(res, '$stable', slots ? !!slots.$stable : true);
+  return res
 }
 
-var target;
+function normalizeScopedSlot(fn) {
+  return function (scope) {
+    var res = fn(scope);
+    return res && typeof res === 'object' && !Array.isArray(res)
+      ? [res] // single vnode
+      : normalizeChildren(res)
+  }
+}
 
-function add (event, fn) {
-  target.$on(event, fn);
+function proxyNormalSlot(slots, key) {
+  return function () { return slots[key]; }
 }
 
-function remove$1 (event, fn) {
-  target.$off(event, fn);
-}
-
-function createOnceHandler (event, fn) {
-  var _target = target;
-  return function onceHandler () {
-    var res = fn.apply(null, arguments);
-    if (res !== null) {
-      _target.$off(event, onceHandler);
-    }
-  }
-}
+/*  */
 
-function updateComponentListeners (
-  vm,
-  listeners,
-  oldListeners
+/**
+ * Runtime helper for rendering v-for lists.
+ */
+function renderList (
+  val,
+  render
 ) {
-  target = vm;
-  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-  target = undefined;
-}
-
-function eventsMixin (Vue) {
-  var hookRE = /^hook:/;
-  Vue.prototype.$on = function (event, fn) {
-    var vm = this;
-    if (Array.isArray(event)) {
-      for (var i = 0, l = event.length; i < l; i++) {
-        vm.$on(event[i], fn);
-      }
-    } else {
-      (vm._events[event] || (vm._events[event] = [])).push(fn);
-      // optimize hook:event cost by using a boolean flag marked at registration
-      // instead of a hash lookup
-      if (hookRE.test(event)) {
-        vm._hasHookEvent = true;
-      }
-    }
-    return vm
-  };
-
-  Vue.prototype.$once = function (event, fn) {
-    var vm = this;
-    function on () {
-      vm.$off(event, on);
-      fn.apply(vm, arguments);
-    }
-    on.fn = fn;
-    vm.$on(event, on);
-    return vm
-  };
-
-  Vue.prototype.$off = function (event, fn) {
-    var vm = this;
-    // all
-    if (!arguments.length) {
-      vm._events = Object.create(null);
-      return vm
-    }
-    // array of events
-    if (Array.isArray(event)) {
-      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
-        vm.$off(event[i$1], fn);
-      }
-      return vm
-    }
-    // specific event
-    var cbs = vm._events[event];
-    if (!cbs) {
-      return vm
-    }
-    if (!fn) {
-      vm._events[event] = null;
-      return vm
+  var ret, i, l, keys, key;
+  if (Array.isArray(val) || typeof val === 'string') {
+    ret = new Array(val.length);
+    for (i = 0, l = val.length; i < l; i++) {
+      ret[i] = render(val[i], i);
     }
-    // specific handler
-    var cb;
-    var i = cbs.length;
-    while (i--) {
-      cb = cbs[i];
-      if (cb === fn || cb.fn === fn) {
-        cbs.splice(i, 1);
-        break
-      }
+  } else if (typeof val === 'number') {
+    ret = new Array(val);
+    for (i = 0; i < val; i++) {
+      ret[i] = render(i + 1, i);
     }
-    return vm
-  };
-
-  Vue.prototype.$emit = function (event) {
-    var vm = this;
-    if (process.env.NODE_ENV !== 'production') {
-      var lowerCaseEvent = event.toLowerCase();
-      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
-        tip(
-          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
-          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
-          "Note that HTML attributes are case-insensitive and you cannot use " +
-          "v-on to listen to camelCase events when using in-DOM templates. " +
-          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
-        );
+  } else if (isObject(val)) {
+    if (hasSymbol && val[Symbol.iterator]) {
+      ret = [];
+      var iterator = val[Symbol.iterator]();
+      var result = iterator.next();
+      while (!result.done) {
+        ret.push(render(result.value, ret.length));
+        result = iterator.next();
       }
-    }
-    var cbs = vm._events[event];
-    if (cbs) {
-      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
-      var args = toArray(arguments, 1);
-      var info = "event handler for \"" + event + "\"";
-      for (var i = 0, l = cbs.length; i < l; i++) {
-        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+    } else {
+      keys = Object.keys(val);
+      ret = new Array(keys.length);
+      for (i = 0, l = keys.length; i < l; i++) {
+        key = keys[i];
+        ret[i] = render(val[key], key, i);
       }
     }
-    return vm
-  };
+  }
+  if (!isDef(ret)) {
+    ret = [];
+  }
+  (ret)._isVList = true;
+  return ret
 }
 
 /*  */
 
-
-
 /**
- * Runtime helper for resolving raw children VNodes into a slot object.
+ * Runtime helper for rendering <slot>
  */
-function resolveSlots (
-  children,
-  context
+function renderSlot (
+  name,
+  fallback,
+  props,
+  bindObject
 ) {
-  if (!children || !children.length) {
-    return {}
-  }
-  var slots = {};
-  for (var i = 0, l = children.length; i < l; i++) {
-    var child = children[i];
-    var data = child.data;
-    // remove slot attribute if the node is resolved as a Vue slot node
-    if (data && data.attrs && data.attrs.slot) {
-      delete data.attrs.slot;
-    }
-    // named slots should only be respected if the vnode was rendered in the
-    // same context.
-    if ((child.context === context || child.fnContext === context) &&
-      data && data.slot != null
-    ) {
-      var name = data.slot;
-      var slot = (slots[name] || (slots[name] = []));
-      if (child.tag === 'template') {
-        slot.push.apply(slot, child.children || []);
-      } else {
-        slot.push(child);
+  var scopedSlotFn = this.$scopedSlots[name];
+  var nodes;
+  if (scopedSlotFn) { // scoped slot
+    props = props || {};
+    if (bindObject) {
+      if (process.env.NODE_ENV !== 'production' && !isObject(bindObject)) {
+        warn(
+          'slot v-bind without argument expects an Object',
+          this
+        );
       }
-    } else {
-      (slots.default || (slots.default = [])).push(child);
-    }
-  }
-  // ignore slots that contains only whitespace
-  for (var name$1 in slots) {
-    if (slots[name$1].every(isWhitespace)) {
-      delete slots[name$1];
+      props = extend(extend({}, bindObject), props);
     }
+    nodes = scopedSlotFn(props) || fallback;
+  } else {
+    nodes = this.$slots[name] || fallback;
   }
-  return slots
-}
-
-function isWhitespace (node) {
-  return (node.isComment && !node.asyncFactory) || node.text === ' '
-}
 
-function resolveScopedSlots (
-  fns, // see flow/vnode
-  hasDynamicKeys,
-  res
-) {
-  res = res || { $stable: !hasDynamicKeys };
-  for (var i = 0; i < fns.length; i++) {
-    var slot = fns[i];
-    if (Array.isArray(slot)) {
-      resolveScopedSlots(slot, hasDynamicKeys, res);
-    } else if (slot) {
-      res[slot.key] = slot.fn;
-    }
+  var target = props && props.slot;
+  if (target) {
+    return this.$createElement('template', { slot: target }, nodes)
+  } else {
+    return nodes
   }
-  return res
 }
 
 /*  */
 
-var activeInstance = null;
-var isUpdatingChildComponent = false;
-
-function setActiveInstance(vm) {
-  var prevActiveInstance = activeInstance;
-  activeInstance = vm;
-  return function () {
-    activeInstance = prevActiveInstance;
-  }
+/**
+ * Runtime helper for resolving filters
+ */
+function resolveFilter (id) {
+  return resolveAsset(this.$options, 'filters', id, true) || identity
 }
 
-function initLifecycle (vm) {
-  var options = vm.$options;
+/*  */
 
-  // locate first non-abstract parent
-  var parent = options.parent;
-  if (parent && !options.abstract) {
-    while (parent.$options.abstract && parent.$parent) {
-      parent = parent.$parent;
-    }
-    parent.$children.push(vm);
+function isKeyNotMatch (expect, actual) {
+  if (Array.isArray(expect)) {
+    return expect.indexOf(actual) === -1
+  } else {
+    return expect !== actual
   }
+}
 
-  vm.$parent = parent;
-  vm.$root = parent ? parent.$root : vm;
-
-  vm.$children = [];
-  vm.$refs = {};
-
-  vm._watcher = null;
-  vm._inactive = null;
-  vm._directInactive = false;
-  vm._isMounted = false;
-  vm._isDestroyed = false;
-  vm._isBeingDestroyed = false;
+/**
+ * Runtime helper for checking keyCodes from config.
+ * exposed as Vue.prototype._k
+ * passing in eventKeyName as last argument separately for backwards compat
+ */
+function checkKeyCodes (
+  eventKeyCode,
+  key,
+  builtInKeyCode,
+  eventKeyName,
+  builtInKeyName
+) {
+  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+    return isKeyNotMatch(builtInKeyName, eventKeyName)
+  } else if (mappedKeyCode) {
+    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+  } else if (eventKeyName) {
+    return hyphenate(eventKeyName) !== key
+  }
 }
 
-function lifecycleMixin (Vue) {
-  Vue.prototype._update = function (vnode, hydrating) {
-    var vm = this;
-    var prevEl = vm.$el;
-    var prevVnode = vm._vnode;
-    var restoreActiveInstance = setActiveInstance(vm);
-    vm._vnode = vnode;
-    // Vue.prototype.__patch__ is injected in entry points
-    // based on the rendering backend used.
-    if (!prevVnode) {
-      // initial render
-      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+/*  */
+
+/**
+ * Runtime helper for merging v-bind="object" into a VNode's data.
+ */
+function bindObjectProps (
+  data,
+  tag,
+  value,
+  asProp,
+  isSync
+) {
+  if (value) {
+    if (!isObject(value)) {
+      process.env.NODE_ENV !== 'production' && warn(
+        'v-bind without argument expects an Object or Array value',
+        this
+      );
     } else {
-      // updates
-      vm.$el = vm.__patch__(prevVnode, vnode);
-    }
-    restoreActiveInstance();
-    // update __vue__ reference
-    if (prevEl) {
-      prevEl.__vue__ = null;
-    }
-    if (vm.$el) {
-      vm.$el.__vue__ = vm;
-    }
-    // if parent is an HOC, update its $el as well
-    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
-      vm.$parent.$el = vm.$el;
-    }
-    // updated hook is called by the scheduler to ensure that children are
-    // updated in a parent's updated hook.
-  };
+      if (Array.isArray(value)) {
+        value = toObject(value);
+      }
+      var hash;
+      var loop = function ( key ) {
+        if (
+          key === 'class' ||
+          key === 'style' ||
+          isReservedAttribute(key)
+        ) {
+          hash = data;
+        } else {
+          var type = data.attrs && data.attrs.type;
+          hash = asProp || config.mustUseProp(tag, type, key)
+            ? data.domProps || (data.domProps = {})
+            : data.attrs || (data.attrs = {});
+        }
+        var camelizedKey = camelize(key);
+        if (!(key in hash) && !(camelizedKey in hash)) {
+          hash[key] = value[key];
 
-  Vue.prototype.$forceUpdate = function () {
-    var vm = this;
-    if (vm._watcher) {
-      vm._watcher.update();
-    }
-  };
+          if (isSync) {
+            var on = data.on || (data.on = {});
+            on[("update:" + camelizedKey)] = function ($event) {
+              value[key] = $event;
+            };
+          }
+        }
+      };
 
-  Vue.prototype.$destroy = function () {
-    var vm = this;
-    if (vm._isBeingDestroyed) {
-      return
-    }
-    callHook(vm, 'beforeDestroy');
-    vm._isBeingDestroyed = true;
-    // remove self from parent
-    var parent = vm.$parent;
-    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
-      remove(parent.$children, vm);
-    }
-    // teardown watchers
-    if (vm._watcher) {
-      vm._watcher.teardown();
-    }
-    var i = vm._watchers.length;
-    while (i--) {
-      vm._watchers[i].teardown();
-    }
-    // remove reference from data ob
-    // frozen object may not have observer.
-    if (vm._data.__ob__) {
-      vm._data.__ob__.vmCount--;
-    }
-    // call the last hook...
-    vm._isDestroyed = true;
-    // invoke destroy hooks on current rendered tree
-    vm.__patch__(vm._vnode, null);
-    // fire destroyed hook
-    callHook(vm, 'destroyed');
-    // turn off all instance listeners.
-    vm.$off();
-    // remove __vue__ reference
-    if (vm.$el) {
-      vm.$el.__vue__ = null;
-    }
-    // release circular reference (#6759)
-    if (vm.$vnode) {
-      vm.$vnode.parent = null;
+      for (var key in value) loop( key );
     }
-  };
+  }
+  return data
 }
 
-function mountComponent (
-  vm,
-  el,
-  hydrating
+/*  */
+
+/**
+ * Runtime helper for rendering static trees.
+ */
+function renderStatic (
+  index,
+  isInFor
 ) {
-  vm.$el = el;
-  if (!vm.$options.render) {
-    vm.$options.render = createEmptyVNode;
-    if (process.env.NODE_ENV !== 'production') {
-      /* istanbul ignore if */
-      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
-        vm.$options.el || el) {
-        warn(
-          'You are using the runtime-only build of Vue where the template ' +
-          'compiler is not available. Either pre-compile the templates into ' +
-          'render functions, or use the compiler-included build.',
-          vm
-        );
-      } else {
-        warn(
-          'Failed to mount component: template or render function not defined.',
-          vm
-        );
+  var cached = this._staticTrees || (this._staticTrees = []);
+  var tree = cached[index];
+  // if has already-rendered static tree and not inside v-for,
+  // we can reuse the same tree.
+  if (tree && !isInFor) {
+    return tree
+  }
+  // otherwise, render a fresh tree.
+  tree = cached[index] = this.$options.staticRenderFns[index].call(
+    this._renderProxy,
+    null,
+    this // for render fns generated for functional component templates
+  );
+  markStatic(tree, ("__static__" + index), false);
+  return tree
+}
+
+/**
+ * Runtime helper for v-once.
+ * Effectively it means marking the node as static with a unique key.
+ */
+function markOnce (
+  tree,
+  index,
+  key
+) {
+  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+  return tree
+}
+
+function markStatic (
+  tree,
+  key,
+  isOnce
+) {
+  if (Array.isArray(tree)) {
+    for (var i = 0; i < tree.length; i++) {
+      if (tree[i] && typeof tree[i] !== 'string') {
+        markStaticNode(tree[i], (key + "_" + i), isOnce);
       }
     }
+  } else {
+    markStaticNode(tree, key, isOnce);
   }
-  callHook(vm, 'beforeMount');
+}
 
-  var updateComponent;
-  /* istanbul ignore if */
-  if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
-    updateComponent = function () {
-      var name = vm._name;
-      var id = vm._uid;
-      var startTag = "vue-perf-start:" + id;
-      var endTag = "vue-perf-end:" + id;
+function markStaticNode (node, key, isOnce) {
+  node.isStatic = true;
+  node.key = key;
+  node.isOnce = isOnce;
+}
 
-      mark(startTag);
-      var vnode = vm._render();
-      mark(endTag);
-      measure(("vue " + name + " render"), startTag, endTag);
+/*  */
 
-      mark(startTag);
-      vm._update(vnode, hydrating);
-      mark(endTag);
-      measure(("vue " + name + " patch"), startTag, endTag);
-    };
-  } else {
-    updateComponent = function () {
-      vm._update(vm._render(), hydrating);
-    };
+function bindObjectListeners (data, value) {
+  if (value) {
+    if (!isPlainObject(value)) {
+      process.env.NODE_ENV !== 'production' && warn(
+        'v-on without argument expects an Object value',
+        this
+      );
+    } else {
+      var on = data.on = data.on ? extend({}, data.on) : {};
+      for (var key in value) {
+        var existing = on[key];
+        var ours = value[key];
+        on[key] = existing ? [].concat(existing, ours) : ours;
+      }
+    }
   }
+  return data
+}
 
-  // we set this to vm._watcher inside the watcher's constructor
-  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
-  // component's mounted hook), which relies on vm._watcher being already defined
-  new Watcher(vm, updateComponent, noop, {
-    before: function before () {
-      if (vm._isMounted && !vm._isDestroyed) {
-        callHook(vm, 'beforeUpdate');
-      }
+/*  */
+
+function resolveScopedSlots (
+  fns, // see flow/vnode
+  hasDynamicKeys,
+  res
+) {
+  res = res || { $stable: !hasDynamicKeys };
+  for (var i = 0; i < fns.length; i++) {
+    var slot = fns[i];
+    if (Array.isArray(slot)) {
+      resolveScopedSlots(slot, hasDynamicKeys, res);
+    } else if (slot) {
+      res[slot.key] = slot.fn;
     }
-  }, true /* isRenderWatcher */);
-  hydrating = false;
+  }
+  return res
+}
 
-  // manually mounted instance, call mounted on self
-  // mounted is called for render-created child components in its inserted hook
-  if (vm.$vnode == null) {
-    vm._isMounted = true;
-    callHook(vm, 'mounted');
+/*  */
+
+function bindDynamicKeys (baseObj, values) {
+  for (var i = 0; i < values.length; i += 2) {
+    var key = values[i];
+    if (typeof key === 'string' && key) {
+      baseObj[values[i]] = values[i + 1];
+    } else if (process.env.NODE_ENV !== 'production' && key !== '' && key !== null) {
+      // null is a speical value for explicitly removing a binding
+      warn(
+        ("Invalid value for dynamic directive argument (expected string or null): " + key),
+        this
+      );
+    }
   }
-  return vm
+  return baseObj
 }
 
-function updateChildComponent (
-  vm,
-  propsData,
-  listeners,
-  parentVnode,
-  renderChildren
+// helper to dynamically append modifier runtime markers to event names.
+// ensure only append when value is already string, otherwise it will be cast
+// to string and cause the type check to miss.
+function prependModifier (value, symbol) {
+  return typeof value === 'string' ? symbol + value : value
+}
+
+/*  */
+
+function installRenderHelpers (target) {
+  target._o = markOnce;
+  target._n = toNumber;
+  target._s = toString;
+  target._l = renderList;
+  target._t = renderSlot;
+  target._q = looseEqual;
+  target._i = looseIndexOf;
+  target._m = renderStatic;
+  target._f = resolveFilter;
+  target._k = checkKeyCodes;
+  target._b = bindObjectProps;
+  target._v = createTextVNode;
+  target._e = createEmptyVNode;
+  target._u = resolveScopedSlots;
+  target._g = bindObjectListeners;
+  target._d = bindDynamicKeys;
+  target._p = prependModifier;
+}
+
+/*  */
+
+function FunctionalRenderContext (
+  data,
+  props,
+  children,
+  parent,
+  Ctor
 ) {
-  if (process.env.NODE_ENV !== 'production') {
-    isUpdatingChildComponent = true;
+  var options = Ctor.options;
+  // ensure the createElement function in functional components
+  // gets a unique context - this is necessary for correct named slot check
+  var contextVm;
+  if (hasOwn(parent, '_uid')) {
+    contextVm = Object.create(parent);
+    // $flow-disable-line
+    contextVm._original = parent;
+  } else {
+    // the context vm passed in is a functional context as well.
+    // in this case we want to make sure we are able to get a hold to the
+    // real context instance.
+    contextVm = parent;
+    // $flow-disable-line
+    parent = parent._original;
   }
+  var isCompiled = isTrue(options._compiled);
+  var needNormalization = !isCompiled;
 
-  // determine whether component has slot children
-  // we need to do this before overwriting $options._renderChildren.
+  this.data = data;
+  this.props = props;
+  this.children = children;
+  this.parent = parent;
+  this.listeners = data.on || emptyObject;
+  this.injections = resolveInject(options.inject, parent);
+  this.slots = function () { return resolveSlots(children, parent); };
 
-  // check if there are dynamic scopedSlots (hand-written or compiled but with
-  // dynamic slot names). Static scoped slots compiled from template has the
-  // "$stable" marker.
-  var hasDynamicScopedSlot = !!(
-    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-  );
-  // Any static slot children from the parent may have changed during parent's
-  // update. Dynamic scoped slots may also have changed. In such cases, a forced
-  // update is necessary to ensure correctness.
-  var needsForceUpdate = !!(
-    renderChildren ||               // has new static slots
-    vm.$options._renderChildren ||  // has old static slots
-    hasDynamicScopedSlot
-  );
+  Object.defineProperty(this, 'scopedSlots', ({
+    enumerable: true,
+    get: function get () {
+      return normalizeScopedSlots(data.scopedSlots, this.slots())
+    }
+  }));
 
-  vm.$options._parentVnode = parentVnode;
-  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+  // support for compiled functional template
+  if (isCompiled) {
+    // exposing $options for renderStatic()
+    this.$options = options;
+    // pre-resolve slots for renderSlot()
+    this.$slots = this.slots();
+    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
+  }
 
-  if (vm._vnode) { // update child tree's parent
-    vm._vnode.parent = parentVnode;
+  if (options._scopeId) {
+    this._c = function (a, b, c, d) {
+      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
+      if (vnode && !Array.isArray(vnode)) {
+        vnode.fnScopeId = options._scopeId;
+        vnode.fnContext = parent;
+      }
+      return vnode
+    };
+  } else {
+    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
   }
-  vm.$options._renderChildren = renderChildren;
+}
 
-  // update $attrs and $listeners hash
-  // these are also reactive so they may trigger child update if the child
-  // used them during render
-  vm.$attrs = parentVnode.data.attrs || emptyObject;
-  vm.$listeners = listeners || emptyObject;
+installRenderHelpers(FunctionalRenderContext.prototype);
 
-  // update props
-  if (propsData && vm.$options.props) {
-    toggleObserving(false);
-    var props = vm._props;
-    var propKeys = vm.$options._propKeys || [];
-    for (var i = 0; i < propKeys.length; i++) {
-      var key = propKeys[i];
-      var propOptions = vm.$options.props; // wtf flow?
-      props[key] = validateProp(key, propOptions, propsData, vm);
+function createFunctionalComponent (
+  Ctor,
+  propsData,
+  data,
+  contextVm,
+  children
+) {
+  var options = Ctor.options;
+  var props = {};
+  var propOptions = options.props;
+  if (isDef(propOptions)) {
+    for (var key in propOptions) {
+      props[key] = validateProp(key, propOptions, propsData || emptyObject);
     }
-    toggleObserving(true);
-    // keep a copy of raw propsData
-    vm.$options.propsData = propsData;
+  } else {
+    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
+    if (isDef(data.props)) { mergeProps(props, data.props); }
   }
 
-  // update listeners
-  listeners = listeners || emptyObject;
-  var oldListeners = vm.$options._parentListeners;
-  vm.$options._parentListeners = listeners;
-  updateComponentListeners(vm, listeners, oldListeners);
+  var renderContext = new FunctionalRenderContext(
+    data,
+    props,
+    children,
+    contextVm,
+    Ctor
+  );
 
-  // resolve slots + force update if has children
-  if (needsForceUpdate) {
-    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-    vm.$forceUpdate();
+  var vnode = options.render.call(null, renderContext._c, renderContext);
+
+  if (vnode instanceof VNode) {
+    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+  } else if (Array.isArray(vnode)) {
+    var vnodes = normalizeChildren(vnode) || [];
+    var res = new Array(vnodes.length);
+    for (var i = 0; i < vnodes.length; i++) {
+      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+    }
+    return res
   }
+}
 
+function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+  // #7817 clone node before setting fnContext, otherwise if the node is reused
+  // (e.g. it was from a cached normal slot) the fnContext causes named slots
+  // that should not be matched to match.
+  var clone = cloneVNode(vnode);
+  clone.fnContext = contextVm;
+  clone.fnOptions = options;
   if (process.env.NODE_ENV !== 'production') {
-    isUpdatingChildComponent = false;
+    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
   }
+  if (data.slot) {
+    (clone.data || (clone.data = {})).slot = data.slot;
+  }
+  return clone
 }
 
-function isInInactiveTree (vm) {
-  while (vm && (vm = vm.$parent)) {
-    if (vm._inactive) { return true }
+function mergeProps (to, from) {
+  for (var key in from) {
+    to[camelize(key)] = from[key];
   }
-  return false
 }
 
-function activateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = false;
-    if (isInInactiveTree(vm)) {
-      return
-    }
-  } else if (vm._directInactive) {
-    return
-  }
-  if (vm._inactive || vm._inactive === null) {
-    vm._inactive = false;
-    for (var i = 0; i < vm.$children.length; i++) {
-      activateChildComponent(vm.$children[i]);
+/*  */
+
+/*  */
+
+/*  */
+
+/*  */
+
+// inline hooks to be invoked on component VNodes during patch
+var componentVNodeHooks = {
+  init: function init (vnode, hydrating) {
+    if (
+      vnode.componentInstance &&
+      !vnode.componentInstance._isDestroyed &&
+      vnode.data.keepAlive
+    ) {
+      // kept-alive components, treat as a patch
+      var mountedNode = vnode; // work around flow
+      componentVNodeHooks.prepatch(mountedNode, mountedNode);
+    } else {
+      var child = vnode.componentInstance = createComponentInstanceForVnode(
+        vnode,
+        activeInstance
+      );
+      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
     }
-    callHook(vm, 'activated');
-  }
-}
+  },
 
-function deactivateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = true;
-    if (isInInactiveTree(vm)) {
-      return
+  prepatch: function prepatch (oldVnode, vnode) {
+    var options = vnode.componentOptions;
+    var child = vnode.componentInstance = oldVnode.componentInstance;
+    updateChildComponent(
+      child,
+      options.propsData, // updated props
+      options.listeners, // updated listeners
+      vnode, // new parent vnode
+      options.children // new children
+    );
+  },
+
+  insert: function insert (vnode) {
+    var context = vnode.context;
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isMounted) {
+      componentInstance._isMounted = true;
+      callHook(componentInstance, 'mounted');
     }
-  }
-  if (!vm._inactive) {
-    vm._inactive = true;
-    for (var i = 0; i < vm.$children.length; i++) {
-      deactivateChildComponent(vm.$children[i]);
+    if (vnode.data.keepAlive) {
+      if (context._isMounted) {
+        // vue-router#1212
+        // During updates, a kept-alive component's child components may
+        // change, so directly walking the tree here may call activated hooks
+        // on incorrect children. Instead we push them into a queue which will
+        // be processed after the whole patch process ended.
+        queueActivatedComponent(componentInstance);
+      } else {
+        activateChildComponent(componentInstance, true /* direct */);
+      }
     }
-    callHook(vm, 'deactivated');
-  }
-}
+  },
 
-function callHook (vm, hook) {
-  // #7573 disable dep collection when invoking lifecycle hooks
-  pushTarget();
-  var handlers = vm.$options[hook];
-  var info = hook + " hook";
-  if (handlers) {
-    for (var i = 0, j = handlers.length; i < j; i++) {
-      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+  destroy: function destroy (vnode) {
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isDestroyed) {
+      if (!vnode.data.keepAlive) {
+        componentInstance.$destroy();
+      } else {
+        deactivateChildComponent(componentInstance, true /* direct */);
+      }
     }
   }
-  if (vm._hasHookEvent) {
-    vm.$emit('hook:' + hook);
-  }
-  popTarget();
-}
+};
 
-/*  */
+var hooksToMerge = Object.keys(componentVNodeHooks);
 
-var MAX_UPDATE_COUNT = 100;
+function createComponent (
+  Ctor,
+  data,
+  context,
+  children,
+  tag
+) {
+  if (isUndef(Ctor)) {
+    return
+  }
 
-var queue = [];
-var activatedChildren = [];
-var has = {};
-var circular = {};
-var waiting = false;
-var flushing = false;
-var index = 0;
+  var baseCtor = context.$options._base;
 
-/**
- * Reset the scheduler's state.
- */
-function resetSchedulerState () {
-  index = queue.length = activatedChildren.length = 0;
-  has = {};
-  if (process.env.NODE_ENV !== 'production') {
-    circular = {};
+  // plain options object: turn it into a constructor
+  if (isObject(Ctor)) {
+    Ctor = baseCtor.extend(Ctor);
   }
-  waiting = flushing = false;
-}
 
-// Async edge case #6566 requires saving the timestamp when event listeners are
-// attached. However, calling performance.now() has a perf overhead especially
-// if the page has thousands of event listeners. Instead, we take a timestamp
-// every time the scheduler flushes and use that for all event listeners
-// attached during that flush.
-var currentFlushTimestamp = 0;
+  // if at this stage it's not a constructor or an async component factory,
+  // reject.
+  if (typeof Ctor !== 'function') {
+    if (process.env.NODE_ENV !== 'production') {
+      warn(("Invalid Component definition: " + (String(Ctor))), context);
+    }
+    return
+  }
 
-// Async edge case fix requires storing an event listener's attach timestamp.
-var getNow = Date.now;
+  // async component
+  var asyncFactory;
+  if (isUndef(Ctor.cid)) {
+    asyncFactory = Ctor;
+    Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+    if (Ctor === undefined) {
+      // return a placeholder node for async component, which is rendered
+      // as a comment node but preserves all the raw information for the node.
+      // the information will be used for async server-rendering and hydration.
+      return createAsyncPlaceholder(
+        asyncFactory,
+        data,
+        context,
+        children,
+        tag
+      )
+    }
+  }
 
-// Determine what event timestamp the browser is using. Annoyingly, the
-// timestamp can either be hi-res ( relative to poge load) or low-res
-// (relative to UNIX epoch), so in order to compare time we have to use the
-// same timestamp type when saving the flush timestamp.
-if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-  // if the low-res timestamp which is bigger than the event timestamp
-  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-  // and we need to use the hi-res version for event listeners as well.
-  getNow = function () { return performance.now(); };
-}
+  data = data || {};
 
-/**
- * Flush both queues and run the watchers.
- */
-function flushSchedulerQueue () {
-  currentFlushTimestamp = getNow();
-  flushing = true;
-  var watcher, id;
+  // resolve constructor options in case global mixins are applied after
+  // component constructor creation
+  resolveConstructorOptions(Ctor);
 
-  // Sort queue before flush.
-  // This ensures that:
-  // 1. Components are updated from parent to child. (because parent is always
-  //    created before the child)
-  // 2. A component's user watchers are run before its render watcher (because
-  //    user watchers are created before the render watcher)
-  // 3. If a component is destroyed during a parent component's watcher run,
-  //    its watchers can be skipped.
-  queue.sort(function (a, b) { return a.id - b.id; });
+  // transform component v-model data into props & events
+  if (isDef(data.model)) {
+    transformModel(Ctor.options, data);
+  }
 
-  // do not cache length because more watchers might be pushed
-  // as we run existing watchers
-  for (index = 0; index < queue.length; index++) {
-    watcher = queue[index];
-    if (watcher.before) {
-      watcher.before();
-    }
-    id = watcher.id;
-    has[id] = null;
-    watcher.run();
-    // in dev build, check and stop circular updates.
-    if (process.env.NODE_ENV !== 'production' && has[id] != null) {
-      circular[id] = (circular[id] || 0) + 1;
-      if (circular[id] > MAX_UPDATE_COUNT) {
-        warn(
-          'You may have an infinite update loop ' + (
-            watcher.user
-              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
-              : "in a component render function."
-          ),
-          watcher.vm
-        );
-        break
-      }
+  // extract props
+  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+
+  // functional component
+  if (isTrue(Ctor.options.functional)) {
+    return createFunctionalComponent(Ctor, propsData, data, context, children)
+  }
+
+  // extract listeners, since these needs to be treated as
+  // child component listeners instead of DOM listeners
+  var listeners = data.on;
+  // replace with listeners with .native modifier
+  // so it gets processed during parent component patch.
+  data.on = data.nativeOn;
+
+  if (isTrue(Ctor.options.abstract)) {
+    // abstract components do not keep anything
+    // other than props & listeners & slot
+
+    // work around flow
+    var slot = data.slot;
+    data = {};
+    if (slot) {
+      data.slot = slot;
     }
   }
 
-  // keep copies of post queues before resetting state
-  var activatedQueue = activatedChildren.slice();
-  var updatedQueue = queue.slice();
+  // install component management hooks onto the placeholder node
+  installComponentHooks(data);
 
-  resetSchedulerState();
+  // return a placeholder vnode
+  var name = Ctor.options.name || tag;
+  var vnode = new VNode(
+    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
+    data, undefined, undefined, undefined, context,
+    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
+    asyncFactory
+  );
 
-  // call component updated and activated hooks
-  callActivatedHooks(activatedQueue);
-  callUpdatedHooks(updatedQueue);
+  return vnode
+}
 
-  // devtool hook
-  /* istanbul ignore if */
-  if (devtools && config.devtools) {
-    devtools.emit('flush');
+function createComponentInstanceForVnode (
+  vnode, // we know it's MountedComponentVNode but flow doesn't
+  parent // activeInstance in lifecycle state
+) {
+  var options = {
+    _isComponent: true,
+    _parentVnode: vnode,
+    parent: parent
+  };
+  // check inline-template render functions
+  var inlineTemplate = vnode.data.inlineTemplate;
+  if (isDef(inlineTemplate)) {
+    options.render = inlineTemplate.render;
+    options.staticRenderFns = inlineTemplate.staticRenderFns;
   }
+  return new vnode.componentOptions.Ctor(options)
 }
 
-function callUpdatedHooks (queue) {
-  var i = queue.length;
-  while (i--) {
-    var watcher = queue[i];
-    var vm = watcher.vm;
-    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
-      callHook(vm, 'updated');
+function installComponentHooks (data) {
+  var hooks = data.hook || (data.hook = {});
+  for (var i = 0; i < hooksToMerge.length; i++) {
+    var key = hooksToMerge[i];
+    var existing = hooks[key];
+    var toMerge = componentVNodeHooks[key];
+    if (existing !== toMerge && !(existing && existing._merged)) {
+      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
     }
   }
 }
 
-/**
- * Queue a kept-alive component that was activated during patch.
- * The queue will be processed after the entire tree has been patched.
- */
-function queueActivatedComponent (vm) {
-  // setting _inactive to false here so that a render function can
-  // rely on checking whether it's in an inactive tree (e.g. router-view)
-  vm._inactive = false;
-  activatedChildren.push(vm);
-}
-
-function callActivatedHooks (queue) {
-  for (var i = 0; i < queue.length; i++) {
-    queue[i]._inactive = true;
-    activateChildComponent(queue[i], true /* true */);
-  }
+function mergeHook$1 (f1, f2) {
+  var merged = function (a, b) {
+    // flow complains about extra args which is why we use any
+    f1(a, b);
+    f2(a, b);
+  };
+  merged._merged = true;
+  return merged
 }
 
-/**
- * Push a watcher into the watcher queue.
- * Jobs with duplicate IDs will be skipped unless it's
- * pushed when the queue is being flushed.
- */
-function queueWatcher (watcher) {
-  var id = watcher.id;
-  if (has[id] == null) {
-    has[id] = true;
-    if (!flushing) {
-      queue.push(watcher);
-    } else {
-      // if already flushing, splice the watcher based on its id
-      // if already past its id, it will be run next immediately.
-      var i = queue.length - 1;
-      while (i > index && queue[i].id > watcher.id) {
-        i--;
-      }
-      queue.splice(i + 1, 0, watcher);
-    }
-    // queue the flush
-    if (!waiting) {
-      waiting = true;
-
-      if (process.env.NODE_ENV !== 'production' && !config.async) {
-        flushSchedulerQueue();
-        return
-      }
-      nextTick(flushSchedulerQueue);
+// transform component v-model info (value and callback) into
+// prop and event handler respectively.
+function transformModel (options, data) {
+  var prop = (options.model && options.model.prop) || 'value';
+  var event = (options.model && options.model.event) || 'input'
+  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+  var on = data.on || (data.on = {});
+  var existing = on[event];
+  var callback = data.model.callback;
+  if (isDef(existing)) {
+    if (
+      Array.isArray(existing)
+        ? existing.indexOf(callback) === -1
+        : existing !== callback
+    ) {
+      on[event] = [callback].concat(existing);
     }
+  } else {
+    on[event] = callback;
   }
 }
 
 /*  */
 
+var SIMPLE_NORMALIZE = 1;
+var ALWAYS_NORMALIZE = 2;
 
+// wrapper function for providing a more flexible interface
+// without getting yelled at by flow
+function createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType,
+  alwaysNormalize
+) {
+  if (Array.isArray(data) || isPrimitive(data)) {
+    normalizationType = children;
+    children = data;
+    data = undefined;
+  }
+  if (isTrue(alwaysNormalize)) {
+    normalizationType = ALWAYS_NORMALIZE;
+  }
+  return _createElement(context, tag, data, children, normalizationType)
+}
 
-var uid$1 = 0;
-
-/**
- * A watcher parses an expression, collects dependencies,
- * and fires callback when the expression value changes.
- * This is used for both the $watch() api and directives.
- */
-var Watcher = function Watcher (
-  vm,
-  expOrFn,
-  cb,
-  options,
-  isRenderWatcher
+function _createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType
 ) {
-  this.vm = vm;
-  if (isRenderWatcher) {
-    vm._watcher = this;
+  if (isDef(data) && isDef((data).__ob__)) {
+    process.env.NODE_ENV !== 'production' && warn(
+      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+      'Always create fresh vnode data objects in each render!',
+      context
+    );
+    return createEmptyVNode()
   }
-  vm._watchers.push(this);
-  // options
-  if (options) {
-    this.deep = !!options.deep;
-    this.user = !!options.user;
-    this.lazy = !!options.lazy;
-    this.sync = !!options.sync;
-    this.before = options.before;
-  } else {
-    this.deep = this.user = this.lazy = this.sync = false;
+  // object syntax in v-bind
+  if (isDef(data) && isDef(data.is)) {
+    tag = data.is;
   }
-  this.cb = cb;
-  this.id = ++uid$1; // uid for batching
-  this.active = true;
-  this.dirty = this.lazy; // for lazy watchers
-  this.deps = [];
-  this.newDeps = [];
-  this.depIds = new _Set();
-  this.newDepIds = new _Set();
-  this.expression = process.env.NODE_ENV !== 'production'
-    ? expOrFn.toString()
-    : '';
-  // parse expression for getter
-  if (typeof expOrFn === 'function') {
-    this.getter = expOrFn;
-  } else {
-    this.getter = parsePath(expOrFn);
-    if (!this.getter) {
-      this.getter = noop;
-      process.env.NODE_ENV !== 'production' && warn(
-        "Failed watching path: \"" + expOrFn + "\" " +
-        'Watcher only accepts simple dot-delimited paths. ' +
-        'For full control, use a function instead.',
-        vm
+  if (!tag) {
+    // in case of component :is set to falsy value
+    return createEmptyVNode()
+  }
+  // warn against non-primitive key
+  if (process.env.NODE_ENV !== 'production' &&
+    isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+  ) {
+    {
+      warn(
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
       );
     }
   }
-  this.value = this.lazy
-    ? undefined
-    : this.get();
-};
-
-/**
- * Evaluate the getter, and re-collect dependencies.
- */
-Watcher.prototype.get = function get () {
-  pushTarget(this);
-  var value;
-  var vm = this.vm;
-  try {
-    value = this.getter.call(vm, vm);
-  } catch (e) {
-    if (this.user) {
-      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+  // support single function children as default scoped slot
+  if (Array.isArray(children) &&
+    typeof children[0] === 'function'
+  ) {
+    data = data || {};
+    data.scopedSlots = { default: children[0] };
+    children.length = 0;
+  }
+  if (normalizationType === ALWAYS_NORMALIZE) {
+    children = normalizeChildren(children);
+  } else if (normalizationType === SIMPLE_NORMALIZE) {
+    children = simpleNormalizeChildren(children);
+  }
+  var vnode, ns;
+  if (typeof tag === 'string') {
+    var Ctor;
+    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+    if (config.isReservedTag(tag)) {
+      // platform built-in elements
+      vnode = new VNode(
+        config.parsePlatformTagName(tag), data, children,
+        undefined, undefined, context
+      );
+    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+      // component
+      vnode = createComponent(Ctor, data, context, children, tag);
     } else {
-      throw e
-    }
-  } finally {
-    // "touch" every property so they are all tracked as
-    // dependencies for deep watching
-    if (this.deep) {
-      traverse(value);
+      // unknown or unlisted namespaced elements
+      // check at runtime because it may get assigned a namespace when its
+      // parent normalizes children
+      vnode = new VNode(
+        tag, data, children,
+        undefined, undefined, context
+      );
     }
-    popTarget();
-    this.cleanupDeps();
+  } else {
+    // direct component options / constructor
+    vnode = createComponent(tag, data, context, children);
   }
-  return value
-};
+  if (Array.isArray(vnode)) {
+    return vnode
+  } else if (isDef(vnode)) {
+    if (isDef(ns)) { applyNS(vnode, ns); }
+    if (isDef(data)) { registerDeepBindings(data); }
+    return vnode
+  } else {
+    return createEmptyVNode()
+  }
+}
 
-/**
- * Add a dependency to this directive.
- */
-Watcher.prototype.addDep = function addDep (dep) {
-  var id = dep.id;
-  if (!this.newDepIds.has(id)) {
-    this.newDepIds.add(id);
-    this.newDeps.push(dep);
-    if (!this.depIds.has(id)) {
-      dep.addSub(this);
+function applyNS (vnode, ns, force) {
+  vnode.ns = ns;
+  if (vnode.tag === 'foreignObject') {
+    // use default namespace inside foreignObject
+    ns = undefined;
+    force = true;
+  }
+  if (isDef(vnode.children)) {
+    for (var i = 0, l = vnode.children.length; i < l; i++) {
+      var child = vnode.children[i];
+      if (isDef(child.tag) && (
+        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+        applyNS(child, ns, force);
+      }
     }
   }
-};
+}
 
-/**
- * Clean up for dependency collection.
- */
-Watcher.prototype.cleanupDeps = function cleanupDeps () {
-  var i = this.deps.length;
-  while (i--) {
-    var dep = this.deps[i];
-    if (!this.newDepIds.has(dep.id)) {
-      dep.removeSub(this);
-    }
+// ref #5318
+// necessary to ensure parent re-render when deep bindings like :style and
+// :class are used on slot nodes
+function registerDeepBindings (data) {
+  if (isObject(data.style)) {
+    traverse(data.style);
   }
-  var tmp = this.depIds;
-  this.depIds = this.newDepIds;
-  this.newDepIds = tmp;
-  this.newDepIds.clear();
-  tmp = this.deps;
-  this.deps = this.newDeps;
-  this.newDeps = tmp;
-  this.newDeps.length = 0;
-};
+  if (isObject(data.class)) {
+    traverse(data.class);
+  }
+}
+
+/*  */
+
+function initRender (vm) {
+  vm._vnode = null; // the root of the child tree
+  vm._staticTrees = null; // v-once cached trees
+  var options = vm.$options;
+  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+  var renderContext = parentVnode && parentVnode.context;
+  vm.$slots = resolveSlots(options._renderChildren, renderContext);
+  vm.$scopedSlots = emptyObject;
+  // bind the createElement fn to this instance
+  // so that we get proper render context inside it.
+  // args order: tag, data, children, normalizationType, alwaysNormalize
+  // internal version is used by render functions compiled from templates
+  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
+  // normalization is always applied for the public version, used in
+  // user-written render functions.
+  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+
+  // $attrs & $listeners are exposed for easier HOC creation.
+  // they need to be reactive so that HOCs using them are always updated
+  var parentData = parentVnode && parentVnode.data;
 
-/**
- * Subscriber interface.
- * Will be called when a dependency changes.
- */
-Watcher.prototype.update = function update () {
   /* istanbul ignore else */
-  if (this.lazy) {
-    this.dirty = true;
-  } else if (this.sync) {
-    this.run();
+  if (process.env.NODE_ENV !== 'production') {
+    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
+    }, true);
+    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
+    }, true);
   } else {
-    queueWatcher(this);
+    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, null, true);
+    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, null, true);
   }
-};
+}
 
-/**
- * Scheduler job interface.
- * Will be called by the scheduler.
- */
-Watcher.prototype.run = function run () {
-  if (this.active) {
-    var value = this.get();
-    if (
-      value !== this.value ||
-      // Deep watchers and watchers on Object/Arrays should fire even
-      // when the value is the same, because the value may
-      // have mutated.
-      isObject(value) ||
-      this.deep
-    ) {
-      // set new value
-      var oldValue = this.value;
-      this.value = value;
-      if (this.user) {
-        try {
-          this.cb.call(this.vm, value, oldValue);
-        } catch (e) {
-          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
-        }
-      } else {
-        this.cb.call(this.vm, value, oldValue);
-      }
-    }
-  }
-};
+var currentRenderingInstance = null;
 
-/**
- * Evaluate the value of the watcher.
- * This only gets called for lazy watchers.
- */
-Watcher.prototype.evaluate = function evaluate () {
-  this.value = this.get();
-  this.dirty = false;
-};
+function renderMixin (Vue) {
+  // install runtime convenience helpers
+  installRenderHelpers(Vue.prototype);
 
-/**
- * Depend on all deps collected by this watcher.
- */
-Watcher.prototype.depend = function depend () {
-  var i = this.deps.length;
-  while (i--) {
-    this.deps[i].depend();
-  }
-};
+  Vue.prototype.$nextTick = function (fn) {
+    return nextTick(fn, this)
+  };
 
-/**
- * Remove self from all dependencies' subscriber list.
- */
-Watcher.prototype.teardown = function teardown () {
-  if (this.active) {
-    // remove self from vm's watcher list
-    // this is a somewhat expensive operation so we skip it
-    // if the vm is being destroyed.
-    if (!this.vm._isBeingDestroyed) {
-      remove(this.vm._watchers, this);
+  Vue.prototype._render = function () {
+    var vm = this;
+    var ref = vm.$options;
+    var render = ref.render;
+    var _parentVnode = ref._parentVnode;
+
+    if (_parentVnode) {
+      vm.$scopedSlots = normalizeScopedSlots(
+        _parentVnode.data.scopedSlots,
+        vm.$slots
+      );
+    }
+
+    // set parent vnode. this allows render functions to have access
+    // to the data on the placeholder node.
+    vm.$vnode = _parentVnode;
+    // render self
+    var vnode;
+    try {
+      // There's no need to maintain a stack becaues all render fns are called
+      // separately from one another. Nested component's render fns are called
+      // when parent component is patched.
+      currentRenderingInstance = vm;
+      vnode = render.call(vm._renderProxy, vm.$createElement);
+    } catch (e) {
+      handleError(e, vm, "render");
+      // return error render result,
+      // or previous vnode to prevent render error causing blank component
+      /* istanbul ignore else */
+      if (process.env.NODE_ENV !== 'production' && vm.$options.renderError) {
+        try {
+          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+        } catch (e) {
+          handleError(e, vm, "renderError");
+          vnode = vm._vnode;
+        }
+      } else {
+        vnode = vm._vnode;
+      }
+    } finally {
+      currentRenderingInstance = null;
     }
-    var i = this.deps.length;
-    while (i--) {
-      this.deps[i].removeSub(this);
+    // if the returned array contains only a single node, allow it
+    if (Array.isArray(vnode) && vnode.length === 1) {
+      vnode = vnode[0];
     }
-    this.active = false;
-  }
-};
+    // return empty vnode in case the render function errored out
+    if (!(vnode instanceof VNode)) {
+      if (process.env.NODE_ENV !== 'production' && Array.isArray(vnode)) {
+        warn(
+          'Multiple root nodes returned from render function. Render function ' +
+          'should return a single root node.',
+          vm
+        );
+      }
+      vnode = createEmptyVNode();
+    }
+    // set parent
+    vnode.parent = _parentVnode;
+    return vnode
+  };
+}
 
 /*  */
 
-var sharedPropertyDefinition = {
-  enumerable: true,
-  configurable: true,
-  get: noop,
-  set: noop
-};
+function ensureCtor (comp, base) {
+  if (
+    comp.__esModule ||
+    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+  ) {
+    comp = comp.default;
+  }
+  return isObject(comp)
+    ? base.extend(comp)
+    : comp
+}
 
-function proxy (target, sourceKey, key) {
-  sharedPropertyDefinition.get = function proxyGetter () {
-    return this[sourceKey][key]
-  };
-  sharedPropertyDefinition.set = function proxySetter (val) {
-    this[sourceKey][key] = val;
-  };
-  Object.defineProperty(target, key, sharedPropertyDefinition);
+function createAsyncPlaceholder (
+  factory,
+  data,
+  context,
+  children,
+  tag
+) {
+  var node = createEmptyVNode();
+  node.asyncFactory = factory;
+  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+  return node
 }
 
-function initState (vm) {
-  vm._watchers = [];
-  var opts = vm.$options;
-  if (opts.props) { initProps(vm, opts.props); }
-  if (opts.methods) { initMethods(vm, opts.methods); }
-  if (opts.data) {
-    initData(vm);
-  } else {
-    observe(vm._data = {}, true /* asRootData */);
+function resolveAsyncComponent (
+  factory,
+  baseCtor
+) {
+  if (isTrue(factory.error) && isDef(factory.errorComp)) {
+    return factory.errorComp
   }
-  if (opts.computed) { initComputed(vm, opts.computed); }
-  if (opts.watch && opts.watch !== nativeWatch) {
-    initWatch(vm, opts.watch);
+
+  if (isDef(factory.resolved)) {
+    return factory.resolved
   }
-}
 
-function initProps (vm, propsOptions) {
-  var propsData = vm.$options.propsData || {};
-  var props = vm._props = {};
-  // cache prop keys so that future props updates can iterate using Array
-  // instead of dynamic object key enumeration.
-  var keys = vm.$options._propKeys = [];
-  var isRoot = !vm.$parent;
-  // root instance props should be converted
-  if (!isRoot) {
-    toggleObserving(false);
+  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+    return factory.loadingComp
   }
-  var loop = function ( key ) {
-    keys.push(key);
-    var value = validateProp(key, propsOptions, propsData, vm);
-    /* istanbul ignore else */
-    if (process.env.NODE_ENV !== 'production') {
-      var hyphenatedKey = hyphenate(key);
-      if (isReservedAttribute(hyphenatedKey) ||
-          config.isReservedAttr(hyphenatedKey)) {
-        warn(
-          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
-          vm
-        );
+
+  var owner = currentRenderingInstance;
+  if (isDef(factory.owners)) {
+    // already pending
+    factory.owners.push(owner);
+  } else {
+    var owners = factory.owners = [owner];
+    var sync = true;
+
+    var forceRender = function (renderCompleted) {
+      for (var i = 0, l = owners.length; i < l; i++) {
+        (owners[i]).$forceUpdate();
       }
-      defineReactive$$1(props, key, value, function () {
-        if (!isRoot && !isUpdatingChildComponent) {
-          warn(
-            "Avoid mutating a prop directly since the value will be " +
-            "overwritten whenever the parent component re-renders. " +
-            "Instead, use a data or computed property based on the prop's " +
-            "value. Prop being mutated: \"" + key + "\"",
-            vm
-          );
-        }
-      });
-    } else {
-      defineReactive$$1(props, key, value);
-    }
-    // static props are already proxied on the component's prototype
-    // during Vue.extend(). We only need to proxy props defined at
-    // instantiation here.
-    if (!(key in vm)) {
-      proxy(vm, "_props", key);
-    }
-  };
 
-  for (var key in propsOptions) loop( key );
-  toggleObserving(true);
-}
+      if (renderCompleted) {
+        owners.length = 0;
+      }
+    };
 
-function initData (vm) {
-  var data = vm.$options.data;
-  data = vm._data = typeof data === 'function'
-    ? getData(data, vm)
-    : data || {};
-  if (!isPlainObject(data)) {
-    data = {};
-    process.env.NODE_ENV !== 'production' && warn(
-      'data functions should return an object:\n' +
-      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
-      vm
-    );
-  }
-  // proxy data on instance
-  var keys = Object.keys(data);
-  var props = vm.$options.props;
-  var methods = vm.$options.methods;
-  var i = keys.length;
-  while (i--) {
-    var key = keys[i];
-    if (process.env.NODE_ENV !== 'production') {
-      if (methods && hasOwn(methods, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a data property."),
-          vm
-        );
+    var resolve = once(function (res) {
+      // cache resolved
+      factory.resolved = ensureCtor(res, baseCtor);
+      // invoke callbacks only if this is not a synchronous resolve
+      // (async resolves are shimmed as synchronous during SSR)
+      if (!sync) {
+        forceRender(true);
+      } else {
+        owners.length = 0;
       }
-    }
-    if (props && hasOwn(props, key)) {
+    });
+
+    var reject = once(function (reason) {
       process.env.NODE_ENV !== 'production' && warn(
-        "The data property \"" + key + "\" is already declared as a prop. " +
-        "Use prop default value instead.",
-        vm
+        "Failed to resolve async component: " + (String(factory)) +
+        (reason ? ("\nReason: " + reason) : '')
       );
-    } else if (!isReserved(key)) {
-      proxy(vm, "_data", key);
-    }
-  }
-  // observe data
-  observe(data, true /* asRootData */);
-}
-
-function getData (data, vm) {
-  // #7573 disable dep collection when invoking data getters
-  pushTarget();
-  try {
-    return data.call(vm, vm)
-  } catch (e) {
-    handleError(e, vm, "data()");
-    return {}
-  } finally {
-    popTarget();
-  }
-}
+      if (isDef(factory.errorComp)) {
+        factory.error = true;
+        forceRender(true);
+      }
+    });
 
-var computedWatcherOptions = { lazy: true };
+    var res = factory(resolve, reject);
 
-function initComputed (vm, computed) {
-  // $flow-disable-line
-  var watchers = vm._computedWatchers = Object.create(null);
-  // computed properties are just getters during SSR
-  var isSSR = isServerRendering();
+    if (isObject(res)) {
+      if (isPromise(res)) {
+        // () => Promise
+        if (isUndef(factory.resolved)) {
+          res.then(resolve, reject);
+        }
+      } else if (isPromise(res.component)) {
+        res.component.then(resolve, reject);
 
-  for (var key in computed) {
-    var userDef = computed[key];
-    var getter = typeof userDef === 'function' ? userDef : userDef.get;
-    if (process.env.NODE_ENV !== 'production' && getter == null) {
-      warn(
-        ("Getter is missing for computed property \"" + key + "\"."),
-        vm
-      );
-    }
+        if (isDef(res.error)) {
+          factory.errorComp = ensureCtor(res.error, baseCtor);
+        }
 
-    if (!isSSR) {
-      // create internal watcher for the computed property.
-      watchers[key] = new Watcher(
-        vm,
-        getter || noop,
-        noop,
-        computedWatcherOptions
-      );
-    }
+        if (isDef(res.loading)) {
+          factory.loadingComp = ensureCtor(res.loading, baseCtor);
+          if (res.delay === 0) {
+            factory.loading = true;
+          } else {
+            setTimeout(function () {
+              if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                factory.loading = true;
+                forceRender(false);
+              }
+            }, res.delay || 200);
+          }
+        }
 
-    // component-defined computed properties are already defined on the
-    // component prototype. We only need to define computed properties defined
-    // at instantiation here.
-    if (!(key in vm)) {
-      defineComputed(vm, key, userDef);
-    } else if (process.env.NODE_ENV !== 'production') {
-      if (key in vm.$data) {
-        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
-      } else if (vm.$options.props && key in vm.$options.props) {
-        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+        if (isDef(res.timeout)) {
+          setTimeout(function () {
+            if (isUndef(factory.resolved)) {
+              reject(
+                process.env.NODE_ENV !== 'production'
+                  ? ("timeout (" + (res.timeout) + "ms)")
+                  : null
+              );
+            }
+          }, res.timeout);
+        }
       }
     }
+
+    sync = false;
+    // return in case resolved synchronously
+    return factory.loading
+      ? factory.loadingComp
+      : factory.resolved
   }
 }
 
-function defineComputed (
-  target,
-  key,
-  userDef
-) {
-  var shouldCache = !isServerRendering();
-  if (typeof userDef === 'function') {
-    sharedPropertyDefinition.get = shouldCache
-      ? createComputedGetter(key)
-      : createGetterInvoker(userDef);
-    sharedPropertyDefinition.set = noop;
-  } else {
-    sharedPropertyDefinition.get = userDef.get
-      ? shouldCache && userDef.cache !== false
-        ? createComputedGetter(key)
-        : createGetterInvoker(userDef.get)
-      : noop;
-    sharedPropertyDefinition.set = userDef.set || noop;
-  }
-  if (process.env.NODE_ENV !== 'production' &&
-      sharedPropertyDefinition.set === noop) {
-    sharedPropertyDefinition.set = function () {
-      warn(
-        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
-        this
-      );
-    };
-  }
-  Object.defineProperty(target, key, sharedPropertyDefinition);
+/*  */
+
+function isAsyncPlaceholder (node) {
+  return node.isComment && node.asyncFactory
 }
 
-function createComputedGetter (key) {
-  return function computedGetter () {
-    var watcher = this._computedWatchers && this._computedWatchers[key];
-    if (watcher) {
-      if (watcher.dirty) {
-        watcher.evaluate();
-      }
-      if (Dep.target) {
-        watcher.depend();
+/*  */
+
+function getFirstComponentChild (children) {
+  if (Array.isArray(children)) {
+    for (var i = 0; i < children.length; i++) {
+      var c = children[i];
+      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+        return c
       }
-      return watcher.value
     }
   }
 }
 
-function createGetterInvoker(fn) {
-  return function computedGetter () {
-    return fn.call(this, this)
+/*  */
+
+/*  */
+
+function initEvents (vm) {
+  vm._events = Object.create(null);
+  vm._hasHookEvent = false;
+  // init parent attached events
+  var listeners = vm.$options._parentListeners;
+  if (listeners) {
+    updateComponentListeners(vm, listeners);
   }
 }
 
-function initMethods (vm, methods) {
-  var props = vm.$options.props;
-  for (var key in methods) {
-    if (process.env.NODE_ENV !== 'production') {
-      if (typeof methods[key] !== 'function') {
-        warn(
-          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
-          "Did you reference the function correctly?",
-          vm
-        );
-      }
-      if (props && hasOwn(props, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a prop."),
-          vm
-        );
-      }
-      if ((key in vm) && isReserved(key)) {
-        warn(
-          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
-          "Avoid defining component methods that start with _ or $."
-        );
-      }
-    }
-    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
-  }
+var target;
+
+function add (event, fn) {
+  target.$on(event, fn);
 }
 
-function initWatch (vm, watch) {
-  for (var key in watch) {
-    var handler = watch[key];
-    if (Array.isArray(handler)) {
-      for (var i = 0; i < handler.length; i++) {
-        createWatcher(vm, key, handler[i]);
-      }
-    } else {
-      createWatcher(vm, key, handler);
+function remove$1 (event, fn) {
+  target.$off(event, fn);
+}
+
+function createOnceHandler (event, fn) {
+  var _target = target;
+  return function onceHandler () {
+    var res = fn.apply(null, arguments);
+    if (res !== null) {
+      _target.$off(event, onceHandler);
     }
   }
 }
 
-function createWatcher (
+function updateComponentListeners (
   vm,
-  expOrFn,
-  handler,
-  options
+  listeners,
+  oldListeners
 ) {
-  if (isPlainObject(handler)) {
-    options = handler;
-    handler = handler.handler;
-  }
-  if (typeof handler === 'string') {
-    handler = vm[handler];
-  }
-  return vm.$watch(expOrFn, handler, options)
+  target = vm;
+  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+  target = undefined;
 }
 
-function stateMixin (Vue) {
-  // flow somehow has problems with directly declared definition object
-  // when using Object.defineProperty, so we have to procedurally build up
-  // the object here.
-  var dataDef = {};
-  dataDef.get = function () { return this._data };
-  var propsDef = {};
-  propsDef.get = function () { return this._props };
-  if (process.env.NODE_ENV !== 'production') {
-    dataDef.set = function () {
-      warn(
-        'Avoid replacing instance root $data. ' +
-        'Use nested data properties instead.',
-        this
-      );
-    };
-    propsDef.set = function () {
-      warn("$props is readonly.", this);
-    };
-  }
-  Object.defineProperty(Vue.prototype, '$data', dataDef);
-  Object.defineProperty(Vue.prototype, '$props', propsDef);
+function eventsMixin (Vue) {
+  var hookRE = /^hook:/;
+  Vue.prototype.$on = function (event, fn) {
+    var vm = this;
+    if (Array.isArray(event)) {
+      for (var i = 0, l = event.length; i < l; i++) {
+        vm.$on(event[i], fn);
+      }
+    } else {
+      (vm._events[event] || (vm._events[event] = [])).push(fn);
+      // optimize hook:event cost by using a boolean flag marked at registration
+      // instead of a hash lookup
+      if (hookRE.test(event)) {
+        vm._hasHookEvent = true;
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$set = set;
-  Vue.prototype.$delete = del;
+  Vue.prototype.$once = function (event, fn) {
+    var vm = this;
+    function on () {
+      vm.$off(event, on);
+      fn.apply(vm, arguments);
+    }
+    on.fn = fn;
+    vm.$on(event, on);
+    return vm
+  };
 
-  Vue.prototype.$watch = function (
-    expOrFn,
-    cb,
-    options
-  ) {
+  Vue.prototype.$off = function (event, fn) {
     var vm = this;
-    if (isPlainObject(cb)) {
-      return createWatcher(vm, expOrFn, cb, options)
+    // all
+    if (!arguments.length) {
+      vm._events = Object.create(null);
+      return vm
     }
-    options = options || {};
-    options.user = true;
-    var watcher = new Watcher(vm, expOrFn, cb, options);
-    if (options.immediate) {
-      try {
-        cb.call(vm, watcher.value);
-      } catch (error) {
-        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
+    // array of events
+    if (Array.isArray(event)) {
+      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
+        vm.$off(event[i$1], fn);
+      }
+      return vm
+    }
+    // specific event
+    var cbs = vm._events[event];
+    if (!cbs) {
+      return vm
+    }
+    if (!fn) {
+      vm._events[event] = null;
+      return vm
+    }
+    // specific handler
+    var cb;
+    var i = cbs.length;
+    while (i--) {
+      cb = cbs[i];
+      if (cb === fn || cb.fn === fn) {
+        cbs.splice(i, 1);
+        break
       }
     }
-    return function unwatchFn () {
-      watcher.teardown();
+    return vm
+  };
+
+  Vue.prototype.$emit = function (event) {
+    var vm = this;
+    if (process.env.NODE_ENV !== 'production') {
+      var lowerCaseEvent = event.toLowerCase();
+      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+        tip(
+          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
+          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
+          "Note that HTML attributes are case-insensitive and you cannot use " +
+          "v-on to listen to camelCase events when using in-DOM templates. " +
+          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
+        );
+      }
+    }
+    var cbs = vm._events[event];
+    if (cbs) {
+      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+      var args = toArray(arguments, 1);
+      var info = "event handler for \"" + event + "\"";
+      for (var i = 0, l = cbs.length; i < l; i++) {
+        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+      }
     }
+    return vm
   };
 }
 
 /*  */
 
-function initProvide (vm) {
-  var provide = vm.$options.provide;
-  if (provide) {
-    vm._provided = typeof provide === 'function'
-      ? provide.call(vm)
-      : provide;
-  }
-}
+var activeInstance = null;
+var isUpdatingChildComponent = false;
 
-function initInjections (vm) {
-  var result = resolveInject(vm.$options.inject, vm);
-  if (result) {
-    toggleObserving(false);
-    Object.keys(result).forEach(function (key) {
-      /* istanbul ignore else */
-      if (process.env.NODE_ENV !== 'production') {
-        defineReactive$$1(vm, key, result[key], function () {
-          warn(
-            "Avoid mutating an injected value directly since the changes will be " +
-            "overwritten whenever the provided component re-renders. " +
-            "injection being mutated: \"" + key + "\"",
-            vm
-          );
-        });
-      } else {
-        defineReactive$$1(vm, key, result[key]);
-      }
-    });
-    toggleObserving(true);
+function setActiveInstance(vm) {
+  var prevActiveInstance = activeInstance;
+  activeInstance = vm;
+  return function () {
+    activeInstance = prevActiveInstance;
   }
 }
 
-function resolveInject (inject, vm) {
-  if (inject) {
-    // inject is :any because flow is not smart enough to figure out cached
-    var result = Object.create(null);
-    var keys = hasSymbol
-      ? Reflect.ownKeys(inject)
-      : Object.keys(inject);
+function initLifecycle (vm) {
+  var options = vm.$options;
 
-    for (var i = 0; i < keys.length; i++) {
-      var key = keys[i];
-      // #6574 in case the inject object is observed...
-      if (key === '__ob__') { continue }
-      var provideKey = inject[key].from;
-      var source = vm;
-      while (source) {
-        if (source._provided && hasOwn(source._provided, provideKey)) {
-          result[key] = source._provided[provideKey];
-          break
-        }
-        source = source.$parent;
-      }
-      if (!source) {
-        if ('default' in inject[key]) {
-          var provideDefault = inject[key].default;
-          result[key] = typeof provideDefault === 'function'
-            ? provideDefault.call(vm)
-            : provideDefault;
-        } else if (process.env.NODE_ENV !== 'production') {
-          warn(("Injection \"" + key + "\" not found"), vm);
-        }
-      }
+  // locate first non-abstract parent
+  var parent = options.parent;
+  if (parent && !options.abstract) {
+    while (parent.$options.abstract && parent.$parent) {
+      parent = parent.$parent;
     }
-    return result
+    parent.$children.push(vm);
   }
-}
-
-/*  */
 
-function normalizeScopedSlots (
-  slots,
-  normalSlots
-) {
-  var res;
-  if (!slots) {
-    res = {};
-  } else if (slots._normalized) {
-    return slots
-  } else {
-    res = {};
-    for (var key in slots) {
-      if (slots[key] && key[0] !== '$') {
-        res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-      }
-    }
-  }
-  // expose normal slots on scopedSlots
-  for (var key$1 in normalSlots) {
-    if (!(key$1 in res)) {
-      res[key$1] = proxyNormalSlot(normalSlots, key$1);
-    }
-  }
-  res._normalized = true;
-  res.$stable = slots ? slots.$stable : true;
-  return res
-}
+  vm.$parent = parent;
+  vm.$root = parent ? parent.$root : vm;
 
-function normalizeScopedSlot(normalSlots, key, fn) {
-  var normalized = function (scope) {
-    if ( scope === void 0 ) scope = {};
+  vm.$children = [];
+  vm.$refs = {};
 
-    var res = fn(scope);
-    return res && typeof res === 'object' && !Array.isArray(res)
-      ? [res] // single vnode
-      : normalizeChildren(res)
-  };
-  // proxy scoped slots on normal $slots
-  if (!hasOwn(normalSlots, key)) {
-    Object.defineProperty(normalSlots, key, {
-      get: normalized
-    });
-  }
-  return normalized
+  vm._watcher = null;
+  vm._inactive = null;
+  vm._directInactive = false;
+  vm._isMounted = false;
+  vm._isDestroyed = false;
+  vm._isBeingDestroyed = false;
 }
 
-function proxyNormalSlot(slots, key) {
-  return function () { return slots[key]; }
-}
+function lifecycleMixin (Vue) {
+  Vue.prototype._update = function (vnode, hydrating) {
+    var vm = this;
+    var prevEl = vm.$el;
+    var prevVnode = vm._vnode;
+    var restoreActiveInstance = setActiveInstance(vm);
+    vm._vnode = vnode;
+    // Vue.prototype.__patch__ is injected in entry points
+    // based on the rendering backend used.
+    if (!prevVnode) {
+      // initial render
+      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+    } else {
+      // updates
+      vm.$el = vm.__patch__(prevVnode, vnode);
+    }
+    restoreActiveInstance();
+    // update __vue__ reference
+    if (prevEl) {
+      prevEl.__vue__ = null;
+    }
+    if (vm.$el) {
+      vm.$el.__vue__ = vm;
+    }
+    // if parent is an HOC, update its $el as well
+    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+      vm.$parent.$el = vm.$el;
+    }
+    // updated hook is called by the scheduler to ensure that children are
+    // updated in a parent's updated hook.
+  };
 
-/*  */
+  Vue.prototype.$forceUpdate = function () {
+    var vm = this;
+    if (vm._watcher) {
+      vm._watcher.update();
+    }
+  };
 
-/**
- * Runtime helper for rendering v-for lists.
- */
-function renderList (
-  val,
-  render
-) {
-  var ret, i, l, keys, key;
-  if (Array.isArray(val) || typeof val === 'string') {
-    ret = new Array(val.length);
-    for (i = 0, l = val.length; i < l; i++) {
-      ret[i] = render(val[i], i);
+  Vue.prototype.$destroy = function () {
+    var vm = this;
+    if (vm._isBeingDestroyed) {
+      return
     }
-  } else if (typeof val === 'number') {
-    ret = new Array(val);
-    for (i = 0; i < val; i++) {
-      ret[i] = render(i + 1, i);
+    callHook(vm, 'beforeDestroy');
+    vm._isBeingDestroyed = true;
+    // remove self from parent
+    var parent = vm.$parent;
+    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+      remove(parent.$children, vm);
     }
-  } else if (isObject(val)) {
-    if (hasSymbol && val[Symbol.iterator]) {
-      ret = [];
-      var iterator = val[Symbol.iterator]();
-      var result = iterator.next();
-      while (!result.done) {
-        ret.push(render(result.value, ret.length));
-        result = iterator.next();
-      }
-    } else {
-      keys = Object.keys(val);
-      ret = new Array(keys.length);
-      for (i = 0, l = keys.length; i < l; i++) {
-        key = keys[i];
-        ret[i] = render(val[key], key, i);
-      }
+    // teardown watchers
+    if (vm._watcher) {
+      vm._watcher.teardown();
+    }
+    var i = vm._watchers.length;
+    while (i--) {
+      vm._watchers[i].teardown();
+    }
+    // remove reference from data ob
+    // frozen object may not have observer.
+    if (vm._data.__ob__) {
+      vm._data.__ob__.vmCount--;
+    }
+    // call the last hook...
+    vm._isDestroyed = true;
+    // invoke destroy hooks on current rendered tree
+    vm.__patch__(vm._vnode, null);
+    // fire destroyed hook
+    callHook(vm, 'destroyed');
+    // turn off all instance listeners.
+    vm.$off();
+    // remove __vue__ reference
+    if (vm.$el) {
+      vm.$el.__vue__ = null;
     }
-  }
-  if (!isDef(ret)) {
-    ret = [];
-  }
-  (ret)._isVList = true;
-  return ret
+    // release circular reference (#6759)
+    if (vm.$vnode) {
+      vm.$vnode.parent = null;
+    }
+  };
 }
 
-/*  */
-
-/**
- * Runtime helper for rendering <slot>
- */
-function renderSlot (
-  name,
-  fallback,
-  props,
-  bindObject
+function mountComponent (
+  vm,
+  el,
+  hydrating
 ) {
-  var scopedSlotFn = this.$scopedSlots[name];
-  var nodes;
-  if (scopedSlotFn) { // scoped slot
-    props = props || {};
-    if (bindObject) {
-      if (process.env.NODE_ENV !== 'production' && !isObject(bindObject)) {
+  vm.$el = el;
+  if (!vm.$options.render) {
+    vm.$options.render = createEmptyVNode;
+    if (process.env.NODE_ENV !== 'production') {
+      /* istanbul ignore if */
+      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+        vm.$options.el || el) {
         warn(
-          'slot v-bind without argument expects an Object',
-          this
+          'You are using the runtime-only build of Vue where the template ' +
+          'compiler is not available. Either pre-compile the templates into ' +
+          'render functions, or use the compiler-included build.',
+          vm
+        );
+      } else {
+        warn(
+          'Failed to mount component: template or render function not defined.',
+          vm
         );
       }
-      props = extend(extend({}, bindObject), props);
     }
-    nodes = scopedSlotFn(props) || fallback;
-  } else {
-    nodes = this.$slots[name] || fallback;
   }
+  callHook(vm, 'beforeMount');
 
-  var target = props && props.slot;
-  if (target) {
-    return this.$createElement('template', { slot: target }, nodes)
-  } else {
-    return nodes
-  }
-}
+  var updateComponent;
+  /* istanbul ignore if */
+  if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
+    updateComponent = function () {
+      var name = vm._name;
+      var id = vm._uid;
+      var startTag = "vue-perf-start:" + id;
+      var endTag = "vue-perf-end:" + id;
 
-/*  */
+      mark(startTag);
+      var vnode = vm._render();
+      mark(endTag);
+      measure(("vue " + name + " render"), startTag, endTag);
 
-/**
- * Runtime helper for resolving filters
- */
-function resolveFilter (id) {
-  return resolveAsset(this.$options, 'filters', id, true) || identity
-}
+      mark(startTag);
+      vm._update(vnode, hydrating);
+      mark(endTag);
+      measure(("vue " + name + " patch"), startTag, endTag);
+    };
+  } else {
+    updateComponent = function () {
+      vm._update(vm._render(), hydrating);
+    };
+  }
 
-/*  */
+  // we set this to vm._watcher inside the watcher's constructor
+  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+  // component's mounted hook), which relies on vm._watcher being already defined
+  new Watcher(vm, updateComponent, noop, {
+    before: function before () {
+      if (vm._isMounted && !vm._isDestroyed) {
+        callHook(vm, 'beforeUpdate');
+      }
+    }
+  }, true /* isRenderWatcher */);
+  hydrating = false;
 
-function isKeyNotMatch (expect, actual) {
-  if (Array.isArray(expect)) {
-    return expect.indexOf(actual) === -1
-  } else {
-    return expect !== actual
+  // manually mounted instance, call mounted on self
+  // mounted is called for render-created child components in its inserted hook
+  if (vm.$vnode == null) {
+    vm._isMounted = true;
+    callHook(vm, 'mounted');
   }
+  return vm
 }
 
-/**
- * Runtime helper for checking keyCodes from config.
- * exposed as Vue.prototype._k
- * passing in eventKeyName as last argument separately for backwards compat
- */
-function checkKeyCodes (
-  eventKeyCode,
-  key,
-  builtInKeyCode,
-  eventKeyName,
-  builtInKeyName
+function updateChildComponent (
+  vm,
+  propsData,
+  listeners,
+  parentVnode,
+  renderChildren
 ) {
-  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-    return isKeyNotMatch(builtInKeyName, eventKeyName)
-  } else if (mappedKeyCode) {
-    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-  } else if (eventKeyName) {
-    return hyphenate(eventKeyName) !== key
+  if (process.env.NODE_ENV !== 'production') {
+    isUpdatingChildComponent = true;
   }
-}
 
-/*  */
+  // determine whether component has slot children
+  // we need to do this before overwriting $options._renderChildren.
 
-/**
- * Runtime helper for merging v-bind="object" into a VNode's data.
- */
-function bindObjectProps (
-  data,
-  tag,
-  value,
-  asProp,
-  isSync
-) {
-  if (value) {
-    if (!isObject(value)) {
-      process.env.NODE_ENV !== 'production' && warn(
-        'v-bind without argument expects an Object or Array value',
-        this
-      );
-    } else {
-      if (Array.isArray(value)) {
-        value = toObject(value);
-      }
-      var hash;
-      var loop = function ( key ) {
-        if (
-          key === 'class' ||
-          key === 'style' ||
-          isReservedAttribute(key)
-        ) {
-          hash = data;
-        } else {
-          var type = data.attrs && data.attrs.type;
-          hash = asProp || config.mustUseProp(tag, type, key)
-            ? data.domProps || (data.domProps = {})
-            : data.attrs || (data.attrs = {});
-        }
-        var camelizedKey = camelize(key);
-        if (!(key in hash) && !(camelizedKey in hash)) {
-          hash[key] = value[key];
+  // check if there are dynamic scopedSlots (hand-written or compiled but with
+  // dynamic slot names). Static scoped slots compiled from template has the
+  // "$stable" marker.
+  var hasDynamicScopedSlot = !!(
+    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+  );
 
-          if (isSync) {
-            var on = data.on || (data.on = {});
-            on[("update:" + camelizedKey)] = function ($event) {
-              value[key] = $event;
-            };
-          }
-        }
-      };
+  // Any static slot children from the parent may have changed during parent's
+  // update. Dynamic scoped slots may also have changed. In such cases, a forced
+  // update is necessary to ensure correctness.
+  var needsForceUpdate = !!(
+    renderChildren ||               // has new static slots
+    vm.$options._renderChildren ||  // has old static slots
+    hasDynamicScopedSlot
+  );
 
-      for (var key in value) loop( key );
+  vm.$options._parentVnode = parentVnode;
+  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+
+  if (vm._vnode) { // update child tree's parent
+    vm._vnode.parent = parentVnode;
+  }
+  vm.$options._renderChildren = renderChildren;
+
+  // update $attrs and $listeners hash
+  // these are also reactive so they may trigger child update if the child
+  // used them during render
+  vm.$attrs = parentVnode.data.attrs || emptyObject;
+  vm.$listeners = listeners || emptyObject;
+
+  // update props
+  if (propsData && vm.$options.props) {
+    toggleObserving(false);
+    var props = vm._props;
+    var propKeys = vm.$options._propKeys || [];
+    for (var i = 0; i < propKeys.length; i++) {
+      var key = propKeys[i];
+      var propOptions = vm.$options.props; // wtf flow?
+      props[key] = validateProp(key, propOptions, propsData, vm);
     }
+    toggleObserving(true);
+    // keep a copy of raw propsData
+    vm.$options.propsData = propsData;
   }
-  return data
-}
 
-/*  */
+  // update listeners
+  listeners = listeners || emptyObject;
+  var oldListeners = vm.$options._parentListeners;
+  vm.$options._parentListeners = listeners;
+  updateComponentListeners(vm, listeners, oldListeners);
 
-/**
- * Runtime helper for rendering static trees.
- */
-function renderStatic (
-  index,
-  isInFor
-) {
-  var cached = this._staticTrees || (this._staticTrees = []);
-  var tree = cached[index];
-  // if has already-rendered static tree and not inside v-for,
-  // we can reuse the same tree.
-  if (tree && !isInFor) {
-    return tree
+  // resolve slots + force update if has children
+  if (needsForceUpdate) {
+    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+    vm.$forceUpdate();
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    isUpdatingChildComponent = false;
   }
-  // otherwise, render a fresh tree.
-  tree = cached[index] = this.$options.staticRenderFns[index].call(
-    this._renderProxy,
-    null,
-    this // for render fns generated for functional component templates
-  );
-  markStatic(tree, ("__static__" + index), false);
-  return tree
 }
 
-/**
- * Runtime helper for v-once.
- * Effectively it means marking the node as static with a unique key.
- */
-function markOnce (
-  tree,
-  index,
-  key
-) {
-  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-  return tree
+function isInInactiveTree (vm) {
+  while (vm && (vm = vm.$parent)) {
+    if (vm._inactive) { return true }
+  }
+  return false
 }
 
-function markStatic (
-  tree,
-  key,
-  isOnce
-) {
-  if (Array.isArray(tree)) {
-    for (var i = 0; i < tree.length; i++) {
-      if (tree[i] && typeof tree[i] !== 'string') {
-        markStaticNode(tree[i], (key + "_" + i), isOnce);
-      }
+function activateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = false;
+    if (isInInactiveTree(vm)) {
+      return
     }
-  } else {
-    markStaticNode(tree, key, isOnce);
+  } else if (vm._directInactive) {
+    return
+  }
+  if (vm._inactive || vm._inactive === null) {
+    vm._inactive = false;
+    for (var i = 0; i < vm.$children.length; i++) {
+      activateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'activated');
   }
 }
 
-function markStaticNode (node, key, isOnce) {
-  node.isStatic = true;
-  node.key = key;
-  node.isOnce = isOnce;
+function deactivateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = true;
+    if (isInInactiveTree(vm)) {
+      return
+    }
+  }
+  if (!vm._inactive) {
+    vm._inactive = true;
+    for (var i = 0; i < vm.$children.length; i++) {
+      deactivateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'deactivated');
+  }
 }
 
-/*  */
-
-function bindObjectListeners (data, value) {
-  if (value) {
-    if (!isPlainObject(value)) {
-      process.env.NODE_ENV !== 'production' && warn(
-        'v-on without argument expects an Object value',
-        this
-      );
-    } else {
-      var on = data.on = data.on ? extend({}, data.on) : {};
-      for (var key in value) {
-        var existing = on[key];
-        var ours = value[key];
-        on[key] = existing ? [].concat(existing, ours) : ours;
-      }
+function callHook (vm, hook) {
+  // #7573 disable dep collection when invoking lifecycle hooks
+  pushTarget();
+  var handlers = vm.$options[hook];
+  var info = hook + " hook";
+  if (handlers) {
+    for (var i = 0, j = handlers.length; i < j; i++) {
+      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
     }
   }
-  return data
+  if (vm._hasHookEvent) {
+    vm.$emit('hook:' + hook);
+  }
+  popTarget();
 }
 
 /*  */
 
-function bindDynamicKeys (baseObj, values) {
-  for (var i = 0; i < values.length; i += 2) {
-    var key = values[i];
-    if (typeof key === 'string' && key) {
-      baseObj[values[i]] = values[i + 1];
-    } else if (process.env.NODE_ENV !== 'production' && key !== '' && key !== null) {
-      // null is a speical value for explicitly removing a binding
-      warn(
-        ("Invalid value for dynamic directive argument (expected string or null): " + key),
-        this
-      );
-    }
+var MAX_UPDATE_COUNT = 100;
+
+var queue = [];
+var activatedChildren = [];
+var has = {};
+var circular = {};
+var waiting = false;
+var flushing = false;
+var index = 0;
+
+/**
+ * Reset the scheduler's state.
+ */
+function resetSchedulerState () {
+  index = queue.length = activatedChildren.length = 0;
+  has = {};
+  if (process.env.NODE_ENV !== 'production') {
+    circular = {};
   }
-  return baseObj
+  waiting = flushing = false;
 }
 
-// helper to dynamically append modifier runtime markers to event names.
-// ensure only append when value is already string, otherwise it will be cast
-// to string and cause the type check to miss.
-function prependModifier (value, symbol) {
-  return typeof value === 'string' ? symbol + value : value
-}
+// Async edge case #6566 requires saving the timestamp when event listeners are
+// attached. However, calling performance.now() has a perf overhead especially
+// if the page has thousands of event listeners. Instead, we take a timestamp
+// every time the scheduler flushes and use that for all event listeners
+// attached during that flush.
+var currentFlushTimestamp = 0;
 
-/*  */
+// Async edge case fix requires storing an event listener's attach timestamp.
+var getNow = Date.now;
 
-function installRenderHelpers (target) {
-  target._o = markOnce;
-  target._n = toNumber;
-  target._s = toString;
-  target._l = renderList;
-  target._t = renderSlot;
-  target._q = looseEqual;
-  target._i = looseIndexOf;
-  target._m = renderStatic;
-  target._f = resolveFilter;
-  target._k = checkKeyCodes;
-  target._b = bindObjectProps;
-  target._v = createTextVNode;
-  target._e = createEmptyVNode;
-  target._u = resolveScopedSlots;
-  target._g = bindObjectListeners;
-  target._d = bindDynamicKeys;
-  target._p = prependModifier;
+// Determine what event timestamp the browser is using. Annoyingly, the
+// timestamp can either be hi-res (relative to page load) or low-res
+// (relative to UNIX epoch), so in order to compare time we have to use the
+// same timestamp type when saving the flush timestamp.
+if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+  // if the low-res timestamp which is bigger than the event timestamp
+  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+  // and we need to use the hi-res version for event listeners as well.
+  getNow = function () { return performance.now(); };
 }
 
-/*  */
-
-function FunctionalRenderContext (
-  data,
-  props,
-  children,
-  parent,
-  Ctor
-) {
-  var options = Ctor.options;
-  // ensure the createElement function in functional components
-  // gets a unique context - this is necessary for correct named slot check
-  var contextVm;
-  if (hasOwn(parent, '_uid')) {
-    contextVm = Object.create(parent);
-    // $flow-disable-line
-    contextVm._original = parent;
-  } else {
-    // the context vm passed in is a functional context as well.
-    // in this case we want to make sure we are able to get a hold to the
-    // real context instance.
-    contextVm = parent;
-    // $flow-disable-line
-    parent = parent._original;
-  }
-  var isCompiled = isTrue(options._compiled);
-  var needNormalization = !isCompiled;
+/**
+ * Flush both queues and run the watchers.
+ */
+function flushSchedulerQueue () {
+  currentFlushTimestamp = getNow();
+  flushing = true;
+  var watcher, id;
 
-  this.data = data;
-  this.props = props;
-  this.children = children;
-  this.parent = parent;
-  this.listeners = data.on || emptyObject;
-  this.injections = resolveInject(options.inject, parent);
-  this.slots = function () { return resolveSlots(children, parent); };
+  // Sort queue before flush.
+  // This ensures that:
+  // 1. Components are updated from parent to child. (because parent is always
+  //    created before the child)
+  // 2. A component's user watchers are run before its render watcher (because
+  //    user watchers are created before the render watcher)
+  // 3. If a component is destroyed during a parent component's watcher run,
+  //    its watchers can be skipped.
+  queue.sort(function (a, b) { return a.id - b.id; });
 
-  Object.defineProperty(this, 'scopedSlots', ({
-    enumerable: true,
-    get: function get () {
-      return normalizeScopedSlots(data.scopedSlots, this.slots())
+  // do not cache length because more watchers might be pushed
+  // as we run existing watchers
+  for (index = 0; index < queue.length; index++) {
+    watcher = queue[index];
+    if (watcher.before) {
+      watcher.before();
     }
-  }));
-
-  // support for compiled functional template
-  if (isCompiled) {
-    // exposing $options for renderStatic()
-    this.$options = options;
-    // pre-resolve slots for renderSlot()
-    this.$slots = this.slots();
-    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
-  }
-
-  if (options._scopeId) {
-    this._c = function (a, b, c, d) {
-      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
-      if (vnode && !Array.isArray(vnode)) {
-        vnode.fnScopeId = options._scopeId;
-        vnode.fnContext = parent;
+    id = watcher.id;
+    has[id] = null;
+    watcher.run();
+    // in dev build, check and stop circular updates.
+    if (process.env.NODE_ENV !== 'production' && has[id] != null) {
+      circular[id] = (circular[id] || 0) + 1;
+      if (circular[id] > MAX_UPDATE_COUNT) {
+        warn(
+          'You may have an infinite update loop ' + (
+            watcher.user
+              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
+              : "in a component render function."
+          ),
+          watcher.vm
+        );
+        break
       }
-      return vnode
-    };
-  } else {
-    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
+    }
   }
-}
 
-installRenderHelpers(FunctionalRenderContext.prototype);
+  // keep copies of post queues before resetting state
+  var activatedQueue = activatedChildren.slice();
+  var updatedQueue = queue.slice();
 
-function createFunctionalComponent (
-  Ctor,
-  propsData,
-  data,
-  contextVm,
-  children
-) {
-  var options = Ctor.options;
-  var props = {};
-  var propOptions = options.props;
-  if (isDef(propOptions)) {
-    for (var key in propOptions) {
-      props[key] = validateProp(key, propOptions, propsData || emptyObject);
-    }
-  } else {
-    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
-    if (isDef(data.props)) { mergeProps(props, data.props); }
-  }
+  resetSchedulerState();
 
-  var renderContext = new FunctionalRenderContext(
-    data,
-    props,
-    children,
-    contextVm,
-    Ctor
-  );
+  // call component updated and activated hooks
+  callActivatedHooks(activatedQueue);
+  callUpdatedHooks(updatedQueue);
 
-  var vnode = options.render.call(null, renderContext._c, renderContext);
+  // devtool hook
+  /* istanbul ignore if */
+  if (devtools && config.devtools) {
+    devtools.emit('flush');
+  }
+}
 
-  if (vnode instanceof VNode) {
-    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
-  } else if (Array.isArray(vnode)) {
-    var vnodes = normalizeChildren(vnode) || [];
-    var res = new Array(vnodes.length);
-    for (var i = 0; i < vnodes.length; i++) {
-      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+function callUpdatedHooks (queue) {
+  var i = queue.length;
+  while (i--) {
+    var watcher = queue[i];
+    var vm = watcher.vm;
+    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+      callHook(vm, 'updated');
     }
-    return res
   }
 }
 
-function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
-  // #7817 clone node before setting fnContext, otherwise if the node is reused
-  // (e.g. it was from a cached normal slot) the fnContext causes named slots
-  // that should not be matched to match.
-  var clone = cloneVNode(vnode);
-  clone.fnContext = contextVm;
-  clone.fnOptions = options;
-  if (process.env.NODE_ENV !== 'production') {
-    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
-  }
-  if (data.slot) {
-    (clone.data || (clone.data = {})).slot = data.slot;
-  }
-  return clone
+/**
+ * Queue a kept-alive component that was activated during patch.
+ * The queue will be processed after the entire tree has been patched.
+ */
+function queueActivatedComponent (vm) {
+  // setting _inactive to false here so that a render function can
+  // rely on checking whether it's in an inactive tree (e.g. router-view)
+  vm._inactive = false;
+  activatedChildren.push(vm);
 }
 
-function mergeProps (to, from) {
-  for (var key in from) {
-    to[camelize(key)] = from[key];
+function callActivatedHooks (queue) {
+  for (var i = 0; i < queue.length; i++) {
+    queue[i]._inactive = true;
+    activateChildComponent(queue[i], true /* true */);
   }
 }
 
-/*  */
+/**
+ * Push a watcher into the watcher queue.
+ * Jobs with duplicate IDs will be skipped unless it's
+ * pushed when the queue is being flushed.
+ */
+function queueWatcher (watcher) {
+  var id = watcher.id;
+  if (has[id] == null) {
+    has[id] = true;
+    if (!flushing) {
+      queue.push(watcher);
+    } else {
+      // if already flushing, splice the watcher based on its id
+      // if already past its id, it will be run next immediately.
+      var i = queue.length - 1;
+      while (i > index && queue[i].id > watcher.id) {
+        i--;
+      }
+      queue.splice(i + 1, 0, watcher);
+    }
+    // queue the flush
+    if (!waiting) {
+      waiting = true;
 
-/*  */
+      if (process.env.NODE_ENV !== 'production' && !config.async) {
+        flushSchedulerQueue();
+        return
+      }
+      nextTick(flushSchedulerQueue);
+    }
+  }
+}
 
 /*  */
 
-/*  */
 
-// inline hooks to be invoked on component VNodes during patch
-var componentVNodeHooks = {
-  init: function init (vnode, hydrating) {
-    if (
-      vnode.componentInstance &&
-      !vnode.componentInstance._isDestroyed &&
-      vnode.data.keepAlive
-    ) {
-      // kept-alive components, treat as a patch
-      var mountedNode = vnode; // work around flow
-      componentVNodeHooks.prepatch(mountedNode, mountedNode);
-    } else {
-      var child = vnode.componentInstance = createComponentInstanceForVnode(
-        vnode,
-        activeInstance
-      );
-      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
-    }
-  },
 
-  prepatch: function prepatch (oldVnode, vnode) {
-    var options = vnode.componentOptions;
-    var child = vnode.componentInstance = oldVnode.componentInstance;
-    updateChildComponent(
-      child,
-      options.propsData, // updated props
-      options.listeners, // updated listeners
-      vnode, // new parent vnode
-      options.children // new children
-    );
-  },
+var uid$2 = 0;
 
-  insert: function insert (vnode) {
-    var context = vnode.context;
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isMounted) {
-      componentInstance._isMounted = true;
-      callHook(componentInstance, 'mounted');
-    }
-    if (vnode.data.keepAlive) {
-      if (context._isMounted) {
-        // vue-router#1212
-        // During updates, a kept-alive component's child components may
-        // change, so directly walking the tree here may call activated hooks
-        // on incorrect children. Instead we push them into a queue which will
-        // be processed after the whole patch process ended.
-        queueActivatedComponent(componentInstance);
-      } else {
-        activateChildComponent(componentInstance, true /* direct */);
-      }
+/**
+ * A watcher parses an expression, collects dependencies,
+ * and fires callback when the expression value changes.
+ * This is used for both the $watch() api and directives.
+ */
+var Watcher = function Watcher (
+  vm,
+  expOrFn,
+  cb,
+  options,
+  isRenderWatcher
+) {
+  this.vm = vm;
+  if (isRenderWatcher) {
+    vm._watcher = this;
+  }
+  vm._watchers.push(this);
+  // options
+  if (options) {
+    this.deep = !!options.deep;
+    this.user = !!options.user;
+    this.lazy = !!options.lazy;
+    this.sync = !!options.sync;
+    this.before = options.before;
+  } else {
+    this.deep = this.user = this.lazy = this.sync = false;
+  }
+  this.cb = cb;
+  this.id = ++uid$2; // uid for batching
+  this.active = true;
+  this.dirty = this.lazy; // for lazy watchers
+  this.deps = [];
+  this.newDeps = [];
+  this.depIds = new _Set();
+  this.newDepIds = new _Set();
+  this.expression = process.env.NODE_ENV !== 'production'
+    ? expOrFn.toString()
+    : '';
+  // parse expression for getter
+  if (typeof expOrFn === 'function') {
+    this.getter = expOrFn;
+  } else {
+    this.getter = parsePath(expOrFn);
+    if (!this.getter) {
+      this.getter = noop;
+      process.env.NODE_ENV !== 'production' && warn(
+        "Failed watching path: \"" + expOrFn + "\" " +
+        'Watcher only accepts simple dot-delimited paths. ' +
+        'For full control, use a function instead.',
+        vm
+      );
     }
-  },
+  }
+  this.value = this.lazy
+    ? undefined
+    : this.get();
+};
 
-  destroy: function destroy (vnode) {
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isDestroyed) {
-      if (!vnode.data.keepAlive) {
-        componentInstance.$destroy();
-      } else {
-        deactivateChildComponent(componentInstance, true /* direct */);
-      }
+/**
+ * Evaluate the getter, and re-collect dependencies.
+ */
+Watcher.prototype.get = function get () {
+  pushTarget(this);
+  var value;
+  var vm = this.vm;
+  try {
+    value = this.getter.call(vm, vm);
+  } catch (e) {
+    if (this.user) {
+      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+    } else {
+      throw e
+    }
+  } finally {
+    // "touch" every property so they are all tracked as
+    // dependencies for deep watching
+    if (this.deep) {
+      traverse(value);
     }
+    popTarget();
+    this.cleanupDeps();
   }
+  return value
 };
 
-var hooksToMerge = Object.keys(componentVNodeHooks);
-
-function createComponent (
-  Ctor,
-  data,
-  context,
-  children,
-  tag
-) {
-  if (isUndef(Ctor)) {
-    return
+/**
+ * Add a dependency to this directive.
+ */
+Watcher.prototype.addDep = function addDep (dep) {
+  var id = dep.id;
+  if (!this.newDepIds.has(id)) {
+    this.newDepIds.add(id);
+    this.newDeps.push(dep);
+    if (!this.depIds.has(id)) {
+      dep.addSub(this);
+    }
   }
+};
 
-  var baseCtor = context.$options._base;
-
-  // plain options object: turn it into a constructor
-  if (isObject(Ctor)) {
-    Ctor = baseCtor.extend(Ctor);
+/**
+ * Clean up for dependency collection.
+ */
+Watcher.prototype.cleanupDeps = function cleanupDeps () {
+  var i = this.deps.length;
+  while (i--) {
+    var dep = this.deps[i];
+    if (!this.newDepIds.has(dep.id)) {
+      dep.removeSub(this);
+    }
   }
+  var tmp = this.depIds;
+  this.depIds = this.newDepIds;
+  this.newDepIds = tmp;
+  this.newDepIds.clear();
+  tmp = this.deps;
+  this.deps = this.newDeps;
+  this.newDeps = tmp;
+  this.newDeps.length = 0;
+};
 
-  // if at this stage it's not a constructor or an async component factory,
-  // reject.
-  if (typeof Ctor !== 'function') {
-    if (process.env.NODE_ENV !== 'production') {
-      warn(("Invalid Component definition: " + (String(Ctor))), context);
-    }
-    return
+/**
+ * Subscriber interface.
+ * Will be called when a dependency changes.
+ */
+Watcher.prototype.update = function update () {
+  /* istanbul ignore else */
+  if (this.lazy) {
+    this.dirty = true;
+  } else if (this.sync) {
+    this.run();
+  } else {
+    queueWatcher(this);
   }
+};
 
-  // async component
-  var asyncFactory;
-  if (isUndef(Ctor.cid)) {
-    asyncFactory = Ctor;
-    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
-    if (Ctor === undefined) {
-      // return a placeholder node for async component, which is rendered
-      // as a comment node but preserves all the raw information for the node.
-      // the information will be used for async server-rendering and hydration.
-      return createAsyncPlaceholder(
-        asyncFactory,
-        data,
-        context,
-        children,
-        tag
-      )
+/**
+ * Scheduler job interface.
+ * Will be called by the scheduler.
+ */
+Watcher.prototype.run = function run () {
+  if (this.active) {
+    var value = this.get();
+    if (
+      value !== this.value ||
+      // Deep watchers and watchers on Object/Arrays should fire even
+      // when the value is the same, because the value may
+      // have mutated.
+      isObject(value) ||
+      this.deep
+    ) {
+      // set new value
+      var oldValue = this.value;
+      this.value = value;
+      if (this.user) {
+        try {
+          this.cb.call(this.vm, value, oldValue);
+        } catch (e) {
+          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
+        }
+      } else {
+        this.cb.call(this.vm, value, oldValue);
+      }
     }
   }
+};
 
-  data = data || {};
+/**
+ * Evaluate the value of the watcher.
+ * This only gets called for lazy watchers.
+ */
+Watcher.prototype.evaluate = function evaluate () {
+  this.value = this.get();
+  this.dirty = false;
+};
 
-  // resolve constructor options in case global mixins are applied after
-  // component constructor creation
-  resolveConstructorOptions(Ctor);
+/**
+ * Depend on all deps collected by this watcher.
+ */
+Watcher.prototype.depend = function depend () {
+  var i = this.deps.length;
+  while (i--) {
+    this.deps[i].depend();
+  }
+};
 
-  // transform component v-model data into props & events
-  if (isDef(data.model)) {
-    transformModel(Ctor.options, data);
+/**
+ * Remove self from all dependencies' subscriber list.
+ */
+Watcher.prototype.teardown = function teardown () {
+  if (this.active) {
+    // remove self from vm's watcher list
+    // this is a somewhat expensive operation so we skip it
+    // if the vm is being destroyed.
+    if (!this.vm._isBeingDestroyed) {
+      remove(this.vm._watchers, this);
+    }
+    var i = this.deps.length;
+    while (i--) {
+      this.deps[i].removeSub(this);
+    }
+    this.active = false;
   }
+};
 
-  // extract props
-  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+/*  */
 
-  // functional component
-  if (isTrue(Ctor.options.functional)) {
-    return createFunctionalComponent(Ctor, propsData, data, context, children)
-  }
+var sharedPropertyDefinition = {
+  enumerable: true,
+  configurable: true,
+  get: noop,
+  set: noop
+};
 
-  // extract listeners, since these needs to be treated as
-  // child component listeners instead of DOM listeners
-  var listeners = data.on;
-  // replace with listeners with .native modifier
-  // so it gets processed during parent component patch.
-  data.on = data.nativeOn;
+function proxy (target, sourceKey, key) {
+  sharedPropertyDefinition.get = function proxyGetter () {
+    return this[sourceKey][key]
+  };
+  sharedPropertyDefinition.set = function proxySetter (val) {
+    this[sourceKey][key] = val;
+  };
+  Object.defineProperty(target, key, sharedPropertyDefinition);
+}
 
-  if (isTrue(Ctor.options.abstract)) {
-    // abstract components do not keep anything
-    // other than props & listeners & slot
+function initState (vm) {
+  vm._watchers = [];
+  var opts = vm.$options;
+  if (opts.props) { initProps(vm, opts.props); }
+  if (opts.methods) { initMethods(vm, opts.methods); }
+  if (opts.data) {
+    initData(vm);
+  } else {
+    observe(vm._data = {}, true /* asRootData */);
+  }
+  if (opts.computed) { initComputed(vm, opts.computed); }
+  if (opts.watch && opts.watch !== nativeWatch) {
+    initWatch(vm, opts.watch);
+  }
+}
 
-    // work around flow
-    var slot = data.slot;
-    data = {};
-    if (slot) {
-      data.slot = slot;
+function initProps (vm, propsOptions) {
+  var propsData = vm.$options.propsData || {};
+  var props = vm._props = {};
+  // cache prop keys so that future props updates can iterate using Array
+  // instead of dynamic object key enumeration.
+  var keys = vm.$options._propKeys = [];
+  var isRoot = !vm.$parent;
+  // root instance props should be converted
+  if (!isRoot) {
+    toggleObserving(false);
+  }
+  var loop = function ( key ) {
+    keys.push(key);
+    var value = validateProp(key, propsOptions, propsData, vm);
+    /* istanbul ignore else */
+    if (process.env.NODE_ENV !== 'production') {
+      var hyphenatedKey = hyphenate(key);
+      if (isReservedAttribute(hyphenatedKey) ||
+          config.isReservedAttr(hyphenatedKey)) {
+        warn(
+          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
+          vm
+        );
+      }
+      defineReactive$$1(props, key, value, function () {
+        if (!isRoot && !isUpdatingChildComponent) {
+          warn(
+            "Avoid mutating a prop directly since the value will be " +
+            "overwritten whenever the parent component re-renders. " +
+            "Instead, use a data or computed property based on the prop's " +
+            "value. Prop being mutated: \"" + key + "\"",
+            vm
+          );
+        }
+      });
+    } else {
+      defineReactive$$1(props, key, value);
+    }
+    // static props are already proxied on the component's prototype
+    // during Vue.extend(). We only need to proxy props defined at
+    // instantiation here.
+    if (!(key in vm)) {
+      proxy(vm, "_props", key);
     }
-  }
-
-  // install component management hooks onto the placeholder node
-  installComponentHooks(data);
-
-  // return a placeholder vnode
-  var name = Ctor.options.name || tag;
-  var vnode = new VNode(
-    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
-    data, undefined, undefined, undefined, context,
-    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
-    asyncFactory
-  );
+  };
 
-  return vnode
+  for (var key in propsOptions) loop( key );
+  toggleObserving(true);
 }
 
-function createComponentInstanceForVnode (
-  vnode, // we know it's MountedComponentVNode but flow doesn't
-  parent // activeInstance in lifecycle state
-) {
-  var options = {
-    _isComponent: true,
-    _parentVnode: vnode,
-    parent: parent
-  };
-  // check inline-template render functions
-  var inlineTemplate = vnode.data.inlineTemplate;
-  if (isDef(inlineTemplate)) {
-    options.render = inlineTemplate.render;
-    options.staticRenderFns = inlineTemplate.staticRenderFns;
+function initData (vm) {
+  var data = vm.$options.data;
+  data = vm._data = typeof data === 'function'
+    ? getData(data, vm)
+    : data || {};
+  if (!isPlainObject(data)) {
+    data = {};
+    process.env.NODE_ENV !== 'production' && warn(
+      'data functions should return an object:\n' +
+      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+      vm
+    );
   }
-  return new vnode.componentOptions.Ctor(options)
-}
-
-function installComponentHooks (data) {
-  var hooks = data.hook || (data.hook = {});
-  for (var i = 0; i < hooksToMerge.length; i++) {
-    var key = hooksToMerge[i];
-    var existing = hooks[key];
-    var toMerge = componentVNodeHooks[key];
-    if (existing !== toMerge && !(existing && existing._merged)) {
-      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
+  // proxy data on instance
+  var keys = Object.keys(data);
+  var props = vm.$options.props;
+  var methods = vm.$options.methods;
+  var i = keys.length;
+  while (i--) {
+    var key = keys[i];
+    if (process.env.NODE_ENV !== 'production') {
+      if (methods && hasOwn(methods, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a data property."),
+          vm
+        );
+      }
+    }
+    if (props && hasOwn(props, key)) {
+      process.env.NODE_ENV !== 'production' && warn(
+        "The data property \"" + key + "\" is already declared as a prop. " +
+        "Use prop default value instead.",
+        vm
+      );
+    } else if (!isReserved(key)) {
+      proxy(vm, "_data", key);
     }
   }
+  // observe data
+  observe(data, true /* asRootData */);
 }
 
-function mergeHook$1 (f1, f2) {
-  var merged = function (a, b) {
-    // flow complains about extra args which is why we use any
-    f1(a, b);
-    f2(a, b);
-  };
-  merged._merged = true;
-  return merged
-}
-
-// transform component v-model info (value and callback) into
-// prop and event handler respectively.
-function transformModel (options, data) {
-  var prop = (options.model && options.model.prop) || 'value';
-  var event = (options.model && options.model.event) || 'input'
-  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
-  var on = data.on || (data.on = {});
-  var existing = on[event];
-  var callback = data.model.callback;
-  if (isDef(existing)) {
-    if (
-      Array.isArray(existing)
-        ? existing.indexOf(callback) === -1
-        : existing !== callback
-    ) {
-      on[event] = [callback].concat(existing);
-    }
-  } else {
-    on[event] = callback;
+function getData (data, vm) {
+  // #7573 disable dep collection when invoking data getters
+  pushTarget();
+  try {
+    return data.call(vm, vm)
+  } catch (e) {
+    handleError(e, vm, "data()");
+    return {}
+  } finally {
+    popTarget();
   }
 }
 
-/*  */
-
-var SIMPLE_NORMALIZE = 1;
-var ALWAYS_NORMALIZE = 2;
+var computedWatcherOptions = { lazy: true };
 
-// wrapper function for providing a more flexible interface
-// without getting yelled at by flow
-function createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType,
-  alwaysNormalize
-) {
-  if (Array.isArray(data) || isPrimitive(data)) {
-    normalizationType = children;
-    children = data;
-    data = undefined;
-  }
-  if (isTrue(alwaysNormalize)) {
-    normalizationType = ALWAYS_NORMALIZE;
-  }
-  return _createElement(context, tag, data, children, normalizationType)
-}
+function initComputed (vm, computed) {
+  // $flow-disable-line
+  var watchers = vm._computedWatchers = Object.create(null);
+  // computed properties are just getters during SSR
+  var isSSR = isServerRendering();
 
-function _createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType
-) {
-  if (isDef(data) && isDef((data).__ob__)) {
-    process.env.NODE_ENV !== 'production' && warn(
-      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-      'Always create fresh vnode data objects in each render!',
-      context
-    );
-    return createEmptyVNode()
-  }
-  // object syntax in v-bind
-  if (isDef(data) && isDef(data.is)) {
-    tag = data.is;
-  }
-  if (!tag) {
-    // in case of component :is set to falsy value
-    return createEmptyVNode()
-  }
-  // warn against non-primitive key
-  if (process.env.NODE_ENV !== 'production' &&
-    isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-  ) {
-    {
+  for (var key in computed) {
+    var userDef = computed[key];
+    var getter = typeof userDef === 'function' ? userDef : userDef.get;
+    if (process.env.NODE_ENV !== 'production' && getter == null) {
       warn(
-        'Avoid using non-primitive value as key, ' +
-        'use string/number value instead.',
-        context
+        ("Getter is missing for computed property \"" + key + "\"."),
+        vm
       );
     }
-  }
-  // support single function children as default scoped slot
-  if (Array.isArray(children) &&
-    typeof children[0] === 'function'
-  ) {
-    data = data || {};
-    data.scopedSlots = { default: children[0] };
-    children.length = 0;
-  }
-  if (normalizationType === ALWAYS_NORMALIZE) {
-    children = normalizeChildren(children);
-  } else if (normalizationType === SIMPLE_NORMALIZE) {
-    children = simpleNormalizeChildren(children);
-  }
-  var vnode, ns;
-  if (typeof tag === 'string') {
-    var Ctor;
-    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-    if (config.isReservedTag(tag)) {
-      // platform built-in elements
-      vnode = new VNode(
-        config.parsePlatformTagName(tag), data, children,
-        undefined, undefined, context
-      );
-    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-      // component
-      vnode = createComponent(Ctor, data, context, children, tag);
-    } else {
-      // unknown or unlisted namespaced elements
-      // check at runtime because it may get assigned a namespace when its
-      // parent normalizes children
-      vnode = new VNode(
-        tag, data, children,
-        undefined, undefined, context
+
+    if (!isSSR) {
+      // create internal watcher for the computed property.
+      watchers[key] = new Watcher(
+        vm,
+        getter || noop,
+        noop,
+        computedWatcherOptions
       );
     }
+
+    // component-defined computed properties are already defined on the
+    // component prototype. We only need to define computed properties defined
+    // at instantiation here.
+    if (!(key in vm)) {
+      defineComputed(vm, key, userDef);
+    } else if (process.env.NODE_ENV !== 'production') {
+      if (key in vm.$data) {
+        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
+      } else if (vm.$options.props && key in vm.$options.props) {
+        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+      }
+    }
+  }
+}
+
+function defineComputed (
+  target,
+  key,
+  userDef
+) {
+  var shouldCache = !isServerRendering();
+  if (typeof userDef === 'function') {
+    sharedPropertyDefinition.get = shouldCache
+      ? createComputedGetter(key)
+      : createGetterInvoker(userDef);
+    sharedPropertyDefinition.set = noop;
   } else {
-    // direct component options / constructor
-    vnode = createComponent(tag, data, context, children);
+    sharedPropertyDefinition.get = userDef.get
+      ? shouldCache && userDef.cache !== false
+        ? createComputedGetter(key)
+        : createGetterInvoker(userDef.get)
+      : noop;
+    sharedPropertyDefinition.set = userDef.set || noop;
   }
-  if (Array.isArray(vnode)) {
-    return vnode
-  } else if (isDef(vnode)) {
-    if (isDef(ns)) { applyNS(vnode, ns); }
-    if (isDef(data)) { registerDeepBindings(data); }
-    return vnode
-  } else {
-    return createEmptyVNode()
+  if (process.env.NODE_ENV !== 'production' &&
+      sharedPropertyDefinition.set === noop) {
+    sharedPropertyDefinition.set = function () {
+      warn(
+        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
+        this
+      );
+    };
   }
+  Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
-function applyNS (vnode, ns, force) {
-  vnode.ns = ns;
-  if (vnode.tag === 'foreignObject') {
-    // use default namespace inside foreignObject
-    ns = undefined;
-    force = true;
-  }
-  if (isDef(vnode.children)) {
-    for (var i = 0, l = vnode.children.length; i < l; i++) {
-      var child = vnode.children[i];
-      if (isDef(child.tag) && (
-        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-        applyNS(child, ns, force);
+function createComputedGetter (key) {
+  return function computedGetter () {
+    var watcher = this._computedWatchers && this._computedWatchers[key];
+    if (watcher) {
+      if (watcher.dirty) {
+        watcher.evaluate();
+      }
+      if (Dep.target) {
+        watcher.depend();
       }
+      return watcher.value
     }
   }
 }
 
-// ref #5318
-// necessary to ensure parent re-render when deep bindings like :style and
-// :class are used on slot nodes
-function registerDeepBindings (data) {
-  if (isObject(data.style)) {
-    traverse(data.style);
-  }
-  if (isObject(data.class)) {
-    traverse(data.class);
+function createGetterInvoker(fn) {
+  return function computedGetter () {
+    return fn.call(this, this)
   }
 }
 
-/*  */
-
-function initRender (vm) {
-  vm._vnode = null; // the root of the child tree
-  vm._staticTrees = null; // v-once cached trees
-  var options = vm.$options;
-  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
-  var renderContext = parentVnode && parentVnode.context;
-  vm.$slots = resolveSlots(options._renderChildren, renderContext);
-  vm.$scopedSlots = emptyObject;
-  // bind the createElement fn to this instance
-  // so that we get proper render context inside it.
-  // args order: tag, data, children, normalizationType, alwaysNormalize
-  // internal version is used by render functions compiled from templates
-  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
-  // normalization is always applied for the public version, used in
-  // user-written render functions.
-  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+function initMethods (vm, methods) {
+  var props = vm.$options.props;
+  for (var key in methods) {
+    if (process.env.NODE_ENV !== 'production') {
+      if (typeof methods[key] !== 'function') {
+        warn(
+          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
+          "Did you reference the function correctly?",
+          vm
+        );
+      }
+      if (props && hasOwn(props, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a prop."),
+          vm
+        );
+      }
+      if ((key in vm) && isReserved(key)) {
+        warn(
+          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
+          "Avoid defining component methods that start with _ or $."
+        );
+      }
+    }
+    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+  }
+}
 
-  // $attrs & $listeners are exposed for easier HOC creation.
-  // they need to be reactive so that HOCs using them are always updated
-  var parentData = parentVnode && parentVnode.data;
+function initWatch (vm, watch) {
+  for (var key in watch) {
+    var handler = watch[key];
+    if (Array.isArray(handler)) {
+      for (var i = 0; i < handler.length; i++) {
+        createWatcher(vm, key, handler[i]);
+      }
+    } else {
+      createWatcher(vm, key, handler);
+    }
+  }
+}
 
-  /* istanbul ignore else */
-  if (process.env.NODE_ENV !== 'production') {
-    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
-    }, true);
-    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
-    }, true);
-  } else {
-    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, null, true);
-    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, null, true);
+function createWatcher (
+  vm,
+  expOrFn,
+  handler,
+  options
+) {
+  if (isPlainObject(handler)) {
+    options = handler;
+    handler = handler.handler;
+  }
+  if (typeof handler === 'string') {
+    handler = vm[handler];
   }
+  return vm.$watch(expOrFn, handler, options)
 }
 
-function renderMixin (Vue) {
-  // install runtime convenience helpers
-  installRenderHelpers(Vue.prototype);
+function stateMixin (Vue) {
+  // flow somehow has problems with directly declared definition object
+  // when using Object.defineProperty, so we have to procedurally build up
+  // the object here.
+  var dataDef = {};
+  dataDef.get = function () { return this._data };
+  var propsDef = {};
+  propsDef.get = function () { return this._props };
+  if (process.env.NODE_ENV !== 'production') {
+    dataDef.set = function () {
+      warn(
+        'Avoid replacing instance root $data. ' +
+        'Use nested data properties instead.',
+        this
+      );
+    };
+    propsDef.set = function () {
+      warn("$props is readonly.", this);
+    };
+  }
+  Object.defineProperty(Vue.prototype, '$data', dataDef);
+  Object.defineProperty(Vue.prototype, '$props', propsDef);
 
-  Vue.prototype.$nextTick = function (fn) {
-    return nextTick(fn, this)
-  };
+  Vue.prototype.$set = set;
+  Vue.prototype.$delete = del;
 
-  Vue.prototype._render = function () {
+  Vue.prototype.$watch = function (
+    expOrFn,
+    cb,
+    options
+  ) {
     var vm = this;
-    var ref = vm.$options;
-    var render = ref.render;
-    var _parentVnode = ref._parentVnode;
-
-    if (_parentVnode) {
-      vm.$scopedSlots = normalizeScopedSlots(
-        _parentVnode.data.scopedSlots,
-        vm.$slots
-      );
+    if (isPlainObject(cb)) {
+      return createWatcher(vm, expOrFn, cb, options)
     }
-
-    // set parent vnode. this allows render functions to have access
-    // to the data on the placeholder node.
-    vm.$vnode = _parentVnode;
-    // render self
-    var vnode;
-    try {
-      vnode = render.call(vm._renderProxy, vm.$createElement);
-    } catch (e) {
-      handleError(e, vm, "render");
-      // return error render result,
-      // or previous vnode to prevent render error causing blank component
-      /* istanbul ignore else */
-      if (process.env.NODE_ENV !== 'production' && vm.$options.renderError) {
-        try {
-          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
-        } catch (e) {
-          handleError(e, vm, "renderError");
-          vnode = vm._vnode;
-        }
-      } else {
-        vnode = vm._vnode;
+    options = options || {};
+    options.user = true;
+    var watcher = new Watcher(vm, expOrFn, cb, options);
+    if (options.immediate) {
+      try {
+        cb.call(vm, watcher.value);
+      } catch (error) {
+        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
       }
     }
-    // if the returned array contains only a single node, allow it
-    if (Array.isArray(vnode) && vnode.length === 1) {
-      vnode = vnode[0];
-    }
-    // return empty vnode in case the render function errored out
-    if (!(vnode instanceof VNode)) {
-      if (process.env.NODE_ENV !== 'production' && Array.isArray(vnode)) {
-        warn(
-          'Multiple root nodes returned from render function. Render function ' +
-          'should return a single root node.',
-          vm
-        );
-      }
-      vnode = createEmptyVNode();
+    return function unwatchFn () {
+      watcher.teardown();
     }
-    // set parent
-    vnode.parent = _parentVnode;
-    return vnode
   };
 }
 
@@ -5348,7 +5351,7 @@ Object.defineProperty(Vue, 'FunctionalRenderContext', {
   value: FunctionalRenderContext
 });
 
-Vue.version = '2.6.2';
+Vue.version = '2.6.3';
 
 /*  */
 
@@ -7414,6 +7417,11 @@ function createOnceHandler$1 (event, handler, capture) {
   }
 }
 
+// #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+// implementation and does not fire microtasks in between event propagation, so
+// safe to exclude.
+var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
 function add$1 (
   name,
   handler,
@@ -7426,11 +7434,16 @@ function add$1 (
   // the solution is simple: we save the timestamp when a handler is attached,
   // and the handler would only fire if the event passed to it was fired
   // AFTER it was attached.
-  if (isUsingMicroTask) {
+  if (useMicrotaskFix) {
     var attachedTimestamp = currentFlushTimestamp;
     var original = handler;
     handler = original._wrapper = function (e) {
-      if (e.timeStamp >= attachedTimestamp) {
+      if (
+        e.timeStamp >= attachedTimestamp ||
+        // #9448 bail if event is fired in another document in a multi-page
+        // electron/nw.js app
+        e.target.ownerDocument !== document
+      ) {
         return original.apply(this, arguments)
       }
     };
@@ -9449,6 +9462,8 @@ var invalidAttributeRE = /[\s"'<>\/=]/;
 
 var decodeHTMLCached = cached(he.decode);
 
+var emptySlotScopeToken = "_empty_";
+
 // configurable state
 var warn$2;
 var delimiters;
@@ -10061,7 +10076,7 @@ function processSlotContent (el) {
         var dynamic = ref.dynamic;
         el.slotTarget = name;
         el.slotTargetDynamic = dynamic;
-        el.slotScope = slotBinding.value || "_"; // force it into a scoped slot for perf
+        el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
       }
     } else {
       // v-slot on component, denotes default slot
@@ -10096,8 +10111,13 @@ function processSlotContent (el) {
         var slotContainer = slots[name$1] = createASTElement('template', [], el);
         slotContainer.slotTarget = name$1;
         slotContainer.slotTargetDynamic = dynamic$1;
-        slotContainer.children = el.children.filter(function (c) { return !(c).slotScope; });
-        slotContainer.slotScope = slotBinding$1.value || "_";
+        slotContainer.children = el.children.filter(function (c) {
+          if (!c.slotScope) {
+            c.parent = slotContainer;
+            return true
+          }
+        });
+        slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
         // remove children as they are returned from scopedSlots now
         el.children = [];
         // mark el non-plain so data gets generated
@@ -11029,7 +11049,7 @@ function genData$2 (el, state) {
   }
   // scoped slots
   if (el.scopedSlots) {
-    data += (genScopedSlots(el.scopedSlots, state)) + ",";
+    data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
   }
   // component v-model
   if (el.model) {
@@ -11102,16 +11122,34 @@ function genInlineTemplate (el, state) {
 }
 
 function genScopedSlots (
+  el,
   slots,
   state
 ) {
-  var hasDynamicKeys = Object.keys(slots).some(function (key) {
+  // by default scoped slots are considered "stable", this allows child
+  // components with only scoped slots to skip forced updates from parent.
+  // but in some cases we have to bail-out of this optimization
+  // for example if the slot contains dynamic names, has v-if or v-for on them...
+  var needsForceUpdate = Object.keys(slots).some(function (key) {
     var slot = slots[key];
     return slot.slotTargetDynamic || slot.if || slot.for
   });
+  // OR when it is inside another scoped slot (the reactivity is disconnected)
+  // #9438
+  if (!needsForceUpdate) {
+    var parent = el.parent;
+    while (parent) {
+      if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+        needsForceUpdate = true;
+        break
+      }
+      parent = parent.parent;
+    }
+  }
+
   return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
       return genScopedSlot(slots[key], state)
-    }).join(',')) + "]" + (hasDynamicKeys ? ",true" : "") + ")")
+    }).join(',')) + "]" + (needsForceUpdate ? ",true" : "") + ")")
 }
 
 function genScopedSlot (
@@ -11125,7 +11163,10 @@ function genScopedSlot (
   if (el.for && !el.forProcessed) {
     return genFor(el, state, genScopedSlot)
   }
-  var fn = "function(" + (String(el.slotScope)) + "){" +
+  var slotScope = el.slotScope === emptySlotScopeToken
+    ? ""
+    : String(el.slotScope);
+  var fn = "function(" + slotScope + "){" +
     "return " + (el.tag === 'template'
       ? el.if && isLegacySyntax
         ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
@@ -11218,7 +11259,14 @@ function genSlot (el, state) {
   var slotName = el.slotName || '"default"';
   var children = genChildren(el, state);
   var res = "_t(" + slotName + (children ? ("," + children) : '');
-  var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
+  var attrs = el.attrs || el.dynamicAttrs
+    ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+        // slot props are camelized
+        name: camelize(attr.name),
+        value: attr.value,
+        dynamic: attr.dynamic
+      }); }))
+    : null;
   var bind$$1 = el.attrsMap['v-bind'];
   if ((attrs || bind$$1) && !children) {
     res += ",null";
diff --git a/dist/vue.js b/dist/vue.js
index b89f44e22df..26151737239 100644
--- a/dist/vue.js
+++ b/dist/vue.js
@@ -1,5 +1,5 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
@@ -538,6 +538,7 @@
   var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
   var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
   var isPhantomJS = UA && /phantomjs/.test(UA);
+  var isFF = UA && UA.match(/firefox\/(\d+)/);
 
   // Firefox has a "watch" function on Object.prototype...
   var nativeWatch = ({}).watch;
@@ -2408,2437 +2409,2439 @@
 
   /*  */
 
-  function ensureCtor (comp, base) {
-    if (
-      comp.__esModule ||
-      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-    ) {
-      comp = comp.default;
+  function initProvide (vm) {
+    var provide = vm.$options.provide;
+    if (provide) {
+      vm._provided = typeof provide === 'function'
+        ? provide.call(vm)
+        : provide;
     }
-    return isObject(comp)
-      ? base.extend(comp)
-      : comp
-  }
-
-  function createAsyncPlaceholder (
-    factory,
-    data,
-    context,
-    children,
-    tag
-  ) {
-    var node = createEmptyVNode();
-    node.asyncFactory = factory;
-    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-    return node
   }
 
-  function resolveAsyncComponent (
-    factory,
-    baseCtor,
-    context
-  ) {
-    if (isTrue(factory.error) && isDef(factory.errorComp)) {
-      return factory.errorComp
-    }
-
-    if (isDef(factory.resolved)) {
-      return factory.resolved
-    }
-
-    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-      return factory.loadingComp
-    }
-
-    if (isDef(factory.contexts)) {
-      // already pending
-      factory.contexts.push(context);
-    } else {
-      var contexts = factory.contexts = [context];
-      var sync = true;
-
-      var forceRender = function (renderCompleted) {
-        for (var i = 0, l = contexts.length; i < l; i++) {
-          contexts[i].$forceUpdate();
-        }
-
-        if (renderCompleted) {
-          contexts.length = 0;
-        }
-      };
-
-      var resolve = once(function (res) {
-        // cache resolved
-        factory.resolved = ensureCtor(res, baseCtor);
-        // invoke callbacks only if this is not a synchronous resolve
-        // (async resolves are shimmed as synchronous during SSR)
-        if (!sync) {
-          forceRender(true);
-        } else {
-          contexts.length = 0;
-        }
-      });
-
-      var reject = once(function (reason) {
-        warn(
-          "Failed to resolve async component: " + (String(factory)) +
-          (reason ? ("\nReason: " + reason) : '')
-        );
-        if (isDef(factory.errorComp)) {
-          factory.error = true;
-          forceRender(true);
+  function initInjections (vm) {
+    var result = resolveInject(vm.$options.inject, vm);
+    if (result) {
+      toggleObserving(false);
+      Object.keys(result).forEach(function (key) {
+        /* istanbul ignore else */
+        {
+          defineReactive$$1(vm, key, result[key], function () {
+            warn(
+              "Avoid mutating an injected value directly since the changes will be " +
+              "overwritten whenever the provided component re-renders. " +
+              "injection being mutated: \"" + key + "\"",
+              vm
+            );
+          });
         }
       });
+      toggleObserving(true);
+    }
+  }
 
-      var res = factory(resolve, reject);
-
-      if (isObject(res)) {
-        if (isPromise(res)) {
-          // () => Promise
-          if (isUndef(factory.resolved)) {
-            res.then(resolve, reject);
-          }
-        } else if (isPromise(res.component)) {
-          res.component.then(resolve, reject);
-
-          if (isDef(res.error)) {
-            factory.errorComp = ensureCtor(res.error, baseCtor);
-          }
+  function resolveInject (inject, vm) {
+    if (inject) {
+      // inject is :any because flow is not smart enough to figure out cached
+      var result = Object.create(null);
+      var keys = hasSymbol
+        ? Reflect.ownKeys(inject)
+        : Object.keys(inject);
 
-          if (isDef(res.loading)) {
-            factory.loadingComp = ensureCtor(res.loading, baseCtor);
-            if (res.delay === 0) {
-              factory.loading = true;
-            } else {
-              setTimeout(function () {
-                if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                  factory.loading = true;
-                  forceRender(false);
-                }
-              }, res.delay || 200);
-            }
+      for (var i = 0; i < keys.length; i++) {
+        var key = keys[i];
+        // #6574 in case the inject object is observed...
+        if (key === '__ob__') { continue }
+        var provideKey = inject[key].from;
+        var source = vm;
+        while (source) {
+          if (source._provided && hasOwn(source._provided, provideKey)) {
+            result[key] = source._provided[provideKey];
+            break
           }
-
-          if (isDef(res.timeout)) {
-            setTimeout(function () {
-              if (isUndef(factory.resolved)) {
-                reject(
-                  "timeout (" + (res.timeout) + "ms)"
-                );
-              }
-            }, res.timeout);
+          source = source.$parent;
+        }
+        if (!source) {
+          if ('default' in inject[key]) {
+            var provideDefault = inject[key].default;
+            result[key] = typeof provideDefault === 'function'
+              ? provideDefault.call(vm)
+              : provideDefault;
+          } else {
+            warn(("Injection \"" + key + "\" not found"), vm);
           }
         }
       }
-
-      sync = false;
-      // return in case resolved synchronously
-      return factory.loading
-        ? factory.loadingComp
-        : factory.resolved
+      return result
     }
   }
 
   /*  */
 
-  function isAsyncPlaceholder (node) {
-    return node.isComment && node.asyncFactory
-  }
 
-  /*  */
 
-  function getFirstComponentChild (children) {
-    if (Array.isArray(children)) {
-      for (var i = 0; i < children.length; i++) {
-        var c = children[i];
-        if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
-          return c
+  /**
+   * Runtime helper for resolving raw children VNodes into a slot object.
+   */
+  function resolveSlots (
+    children,
+    context
+  ) {
+    if (!children || !children.length) {
+      return {}
+    }
+    var slots = {};
+    for (var i = 0, l = children.length; i < l; i++) {
+      var child = children[i];
+      var data = child.data;
+      // remove slot attribute if the node is resolved as a Vue slot node
+      if (data && data.attrs && data.attrs.slot) {
+        delete data.attrs.slot;
+      }
+      // named slots should only be respected if the vnode was rendered in the
+      // same context.
+      if ((child.context === context || child.fnContext === context) &&
+        data && data.slot != null
+      ) {
+        var name = data.slot;
+        var slot = (slots[name] || (slots[name] = []));
+        if (child.tag === 'template') {
+          slot.push.apply(slot, child.children || []);
+        } else {
+          slot.push(child);
         }
+      } else {
+        (slots.default || (slots.default = [])).push(child);
+      }
+    }
+    // ignore slots that contains only whitespace
+    for (var name$1 in slots) {
+      if (slots[name$1].every(isWhitespace)) {
+        delete slots[name$1];
       }
     }
+    return slots
   }
 
-  /*  */
+  function isWhitespace (node) {
+    return (node.isComment && !node.asyncFactory) || node.text === ' '
+  }
 
   /*  */
 
-  function initEvents (vm) {
-    vm._events = Object.create(null);
-    vm._hasHookEvent = false;
-    // init parent attached events
-    var listeners = vm.$options._parentListeners;
-    if (listeners) {
-      updateComponentListeners(vm, listeners);
+  function normalizeScopedSlots (
+    slots,
+    normalSlots
+  ) {
+    var res;
+    if (!slots) {
+      res = {};
+    } else if (slots._normalized) {
+      return slots
+    } else {
+      res = {};
+      for (var key in slots) {
+        if (slots[key] && key[0] !== '$') {
+          res[key] = normalizeScopedSlot(slots[key]);
+        }
+      }
+    }
+    // expose normal slots on scopedSlots
+    for (var key$1 in normalSlots) {
+      if (!(key$1 in res)) {
+        res[key$1] = proxyNormalSlot(normalSlots, key$1);
+      }
     }
+    def(res, '_normalized', true);
+    def(res, '$stable', slots ? !!slots.$stable : true);
+    return res
   }
 
-  var target;
-
-  function add (event, fn) {
-    target.$on(event, fn);
+  function normalizeScopedSlot(fn) {
+    return function (scope) {
+      var res = fn(scope);
+      return res && typeof res === 'object' && !Array.isArray(res)
+        ? [res] // single vnode
+        : normalizeChildren(res)
+    }
   }
 
-  function remove$1 (event, fn) {
-    target.$off(event, fn);
+  function proxyNormalSlot(slots, key) {
+    return function () { return slots[key]; }
   }
 
-  function createOnceHandler (event, fn) {
-    var _target = target;
-    return function onceHandler () {
-      var res = fn.apply(null, arguments);
-      if (res !== null) {
-        _target.$off(event, onceHandler);
-      }
-    }
-  }
+  /*  */
 
-  function updateComponentListeners (
-    vm,
-    listeners,
-    oldListeners
+  /**
+   * Runtime helper for rendering v-for lists.
+   */
+  function renderList (
+    val,
+    render
   ) {
-    target = vm;
-    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-    target = undefined;
-  }
-
-  function eventsMixin (Vue) {
-    var hookRE = /^hook:/;
-    Vue.prototype.$on = function (event, fn) {
-      var vm = this;
-      if (Array.isArray(event)) {
-        for (var i = 0, l = event.length; i < l; i++) {
-          vm.$on(event[i], fn);
-        }
-      } else {
-        (vm._events[event] || (vm._events[event] = [])).push(fn);
-        // optimize hook:event cost by using a boolean flag marked at registration
-        // instead of a hash lookup
-        if (hookRE.test(event)) {
-          vm._hasHookEvent = true;
-        }
-      }
-      return vm
-    };
-
-    Vue.prototype.$once = function (event, fn) {
-      var vm = this;
-      function on () {
-        vm.$off(event, on);
-        fn.apply(vm, arguments);
-      }
-      on.fn = fn;
-      vm.$on(event, on);
-      return vm
-    };
-
-    Vue.prototype.$off = function (event, fn) {
-      var vm = this;
-      // all
-      if (!arguments.length) {
-        vm._events = Object.create(null);
-        return vm
-      }
-      // array of events
-      if (Array.isArray(event)) {
-        for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
-          vm.$off(event[i$1], fn);
-        }
-        return vm
-      }
-      // specific event
-      var cbs = vm._events[event];
-      if (!cbs) {
-        return vm
-      }
-      if (!fn) {
-        vm._events[event] = null;
-        return vm
+    var ret, i, l, keys, key;
+    if (Array.isArray(val) || typeof val === 'string') {
+      ret = new Array(val.length);
+      for (i = 0, l = val.length; i < l; i++) {
+        ret[i] = render(val[i], i);
       }
-      // specific handler
-      var cb;
-      var i = cbs.length;
-      while (i--) {
-        cb = cbs[i];
-        if (cb === fn || cb.fn === fn) {
-          cbs.splice(i, 1);
-          break
-        }
+    } else if (typeof val === 'number') {
+      ret = new Array(val);
+      for (i = 0; i < val; i++) {
+        ret[i] = render(i + 1, i);
       }
-      return vm
-    };
-
-    Vue.prototype.$emit = function (event) {
-      var vm = this;
-      {
-        var lowerCaseEvent = event.toLowerCase();
-        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
-          tip(
-            "Event \"" + lowerCaseEvent + "\" is emitted in component " +
-            (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
-            "Note that HTML attributes are case-insensitive and you cannot use " +
-            "v-on to listen to camelCase events when using in-DOM templates. " +
-            "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
-          );
+    } else if (isObject(val)) {
+      if (hasSymbol && val[Symbol.iterator]) {
+        ret = [];
+        var iterator = val[Symbol.iterator]();
+        var result = iterator.next();
+        while (!result.done) {
+          ret.push(render(result.value, ret.length));
+          result = iterator.next();
         }
-      }
-      var cbs = vm._events[event];
-      if (cbs) {
-        cbs = cbs.length > 1 ? toArray(cbs) : cbs;
-        var args = toArray(arguments, 1);
-        var info = "event handler for \"" + event + "\"";
-        for (var i = 0, l = cbs.length; i < l; i++) {
-          invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+      } else {
+        keys = Object.keys(val);
+        ret = new Array(keys.length);
+        for (i = 0, l = keys.length; i < l; i++) {
+          key = keys[i];
+          ret[i] = render(val[key], key, i);
         }
       }
-      return vm
-    };
+    }
+    if (!isDef(ret)) {
+      ret = [];
+    }
+    (ret)._isVList = true;
+    return ret
   }
 
   /*  */
 
-
-
   /**
-   * Runtime helper for resolving raw children VNodes into a slot object.
+   * Runtime helper for rendering <slot>
    */
-  function resolveSlots (
-    children,
-    context
+  function renderSlot (
+    name,
+    fallback,
+    props,
+    bindObject
   ) {
-    if (!children || !children.length) {
-      return {}
-    }
-    var slots = {};
-    for (var i = 0, l = children.length; i < l; i++) {
-      var child = children[i];
-      var data = child.data;
-      // remove slot attribute if the node is resolved as a Vue slot node
-      if (data && data.attrs && data.attrs.slot) {
-        delete data.attrs.slot;
-      }
-      // named slots should only be respected if the vnode was rendered in the
-      // same context.
-      if ((child.context === context || child.fnContext === context) &&
-        data && data.slot != null
-      ) {
-        var name = data.slot;
-        var slot = (slots[name] || (slots[name] = []));
-        if (child.tag === 'template') {
-          slot.push.apply(slot, child.children || []);
-        } else {
-          slot.push(child);
+    var scopedSlotFn = this.$scopedSlots[name];
+    var nodes;
+    if (scopedSlotFn) { // scoped slot
+      props = props || {};
+      if (bindObject) {
+        if (!isObject(bindObject)) {
+          warn(
+            'slot v-bind without argument expects an Object',
+            this
+          );
         }
-      } else {
-        (slots.default || (slots.default = [])).push(child);
-      }
-    }
-    // ignore slots that contains only whitespace
-    for (var name$1 in slots) {
-      if (slots[name$1].every(isWhitespace)) {
-        delete slots[name$1];
+        props = extend(extend({}, bindObject), props);
       }
+      nodes = scopedSlotFn(props) || fallback;
+    } else {
+      nodes = this.$slots[name] || fallback;
     }
-    return slots
-  }
-
-  function isWhitespace (node) {
-    return (node.isComment && !node.asyncFactory) || node.text === ' '
-  }
 
-  function resolveScopedSlots (
-    fns, // see flow/vnode
-    hasDynamicKeys,
-    res
-  ) {
-    res = res || { $stable: !hasDynamicKeys };
-    for (var i = 0; i < fns.length; i++) {
-      var slot = fns[i];
-      if (Array.isArray(slot)) {
-        resolveScopedSlots(slot, hasDynamicKeys, res);
-      } else if (slot) {
-        res[slot.key] = slot.fn;
-      }
+    var target = props && props.slot;
+    if (target) {
+      return this.$createElement('template', { slot: target }, nodes)
+    } else {
+      return nodes
     }
-    return res
   }
 
   /*  */
 
-  var activeInstance = null;
-  var isUpdatingChildComponent = false;
-
-  function setActiveInstance(vm) {
-    var prevActiveInstance = activeInstance;
-    activeInstance = vm;
-    return function () {
-      activeInstance = prevActiveInstance;
-    }
+  /**
+   * Runtime helper for resolving filters
+   */
+  function resolveFilter (id) {
+    return resolveAsset(this.$options, 'filters', id, true) || identity
   }
 
-  function initLifecycle (vm) {
-    var options = vm.$options;
+  /*  */
 
-    // locate first non-abstract parent
-    var parent = options.parent;
-    if (parent && !options.abstract) {
-      while (parent.$options.abstract && parent.$parent) {
-        parent = parent.$parent;
-      }
-      parent.$children.push(vm);
+  function isKeyNotMatch (expect, actual) {
+    if (Array.isArray(expect)) {
+      return expect.indexOf(actual) === -1
+    } else {
+      return expect !== actual
     }
+  }
 
-    vm.$parent = parent;
-    vm.$root = parent ? parent.$root : vm;
-
-    vm.$children = [];
-    vm.$refs = {};
-
-    vm._watcher = null;
-    vm._inactive = null;
-    vm._directInactive = false;
-    vm._isMounted = false;
-    vm._isDestroyed = false;
-    vm._isBeingDestroyed = false;
+  /**
+   * Runtime helper for checking keyCodes from config.
+   * exposed as Vue.prototype._k
+   * passing in eventKeyName as last argument separately for backwards compat
+   */
+  function checkKeyCodes (
+    eventKeyCode,
+    key,
+    builtInKeyCode,
+    eventKeyName,
+    builtInKeyName
+  ) {
+    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+      return isKeyNotMatch(builtInKeyName, eventKeyName)
+    } else if (mappedKeyCode) {
+      return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+    } else if (eventKeyName) {
+      return hyphenate(eventKeyName) !== key
+    }
   }
 
-  function lifecycleMixin (Vue) {
-    Vue.prototype._update = function (vnode, hydrating) {
-      var vm = this;
-      var prevEl = vm.$el;
-      var prevVnode = vm._vnode;
-      var restoreActiveInstance = setActiveInstance(vm);
-      vm._vnode = vnode;
-      // Vue.prototype.__patch__ is injected in entry points
-      // based on the rendering backend used.
-      if (!prevVnode) {
-        // initial render
-        vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+  /*  */
+
+  /**
+   * Runtime helper for merging v-bind="object" into a VNode's data.
+   */
+  function bindObjectProps (
+    data,
+    tag,
+    value,
+    asProp,
+    isSync
+  ) {
+    if (value) {
+      if (!isObject(value)) {
+        warn(
+          'v-bind without argument expects an Object or Array value',
+          this
+        );
       } else {
-        // updates
-        vm.$el = vm.__patch__(prevVnode, vnode);
-      }
-      restoreActiveInstance();
-      // update __vue__ reference
-      if (prevEl) {
-        prevEl.__vue__ = null;
-      }
-      if (vm.$el) {
-        vm.$el.__vue__ = vm;
-      }
-      // if parent is an HOC, update its $el as well
-      if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
-        vm.$parent.$el = vm.$el;
-      }
-      // updated hook is called by the scheduler to ensure that children are
-      // updated in a parent's updated hook.
-    };
+        if (Array.isArray(value)) {
+          value = toObject(value);
+        }
+        var hash;
+        var loop = function ( key ) {
+          if (
+            key === 'class' ||
+            key === 'style' ||
+            isReservedAttribute(key)
+          ) {
+            hash = data;
+          } else {
+            var type = data.attrs && data.attrs.type;
+            hash = asProp || config.mustUseProp(tag, type, key)
+              ? data.domProps || (data.domProps = {})
+              : data.attrs || (data.attrs = {});
+          }
+          var camelizedKey = camelize(key);
+          if (!(key in hash) && !(camelizedKey in hash)) {
+            hash[key] = value[key];
 
-    Vue.prototype.$forceUpdate = function () {
-      var vm = this;
-      if (vm._watcher) {
-        vm._watcher.update();
-      }
-    };
+            if (isSync) {
+              var on = data.on || (data.on = {});
+              on[("update:" + camelizedKey)] = function ($event) {
+                value[key] = $event;
+              };
+            }
+          }
+        };
 
-    Vue.prototype.$destroy = function () {
-      var vm = this;
-      if (vm._isBeingDestroyed) {
-        return
-      }
-      callHook(vm, 'beforeDestroy');
-      vm._isBeingDestroyed = true;
-      // remove self from parent
-      var parent = vm.$parent;
-      if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
-        remove(parent.$children, vm);
-      }
-      // teardown watchers
-      if (vm._watcher) {
-        vm._watcher.teardown();
-      }
-      var i = vm._watchers.length;
-      while (i--) {
-        vm._watchers[i].teardown();
-      }
-      // remove reference from data ob
-      // frozen object may not have observer.
-      if (vm._data.__ob__) {
-        vm._data.__ob__.vmCount--;
-      }
-      // call the last hook...
-      vm._isDestroyed = true;
-      // invoke destroy hooks on current rendered tree
-      vm.__patch__(vm._vnode, null);
-      // fire destroyed hook
-      callHook(vm, 'destroyed');
-      // turn off all instance listeners.
-      vm.$off();
-      // remove __vue__ reference
-      if (vm.$el) {
-        vm.$el.__vue__ = null;
-      }
-      // release circular reference (#6759)
-      if (vm.$vnode) {
-        vm.$vnode.parent = null;
+        for (var key in value) loop( key );
       }
-    };
+    }
+    return data
   }
 
-  function mountComponent (
-    vm,
-    el,
-    hydrating
+  /*  */
+
+  /**
+   * Runtime helper for rendering static trees.
+   */
+  function renderStatic (
+    index,
+    isInFor
   ) {
-    vm.$el = el;
-    if (!vm.$options.render) {
-      vm.$options.render = createEmptyVNode;
-      {
-        /* istanbul ignore if */
-        if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
-          vm.$options.el || el) {
-          warn(
-            'You are using the runtime-only build of Vue where the template ' +
-            'compiler is not available. Either pre-compile the templates into ' +
-            'render functions, or use the compiler-included build.',
-            vm
-          );
-        } else {
-          warn(
-            'Failed to mount component: template or render function not defined.',
-            vm
-          );
-        }
-      }
+    var cached = this._staticTrees || (this._staticTrees = []);
+    var tree = cached[index];
+    // if has already-rendered static tree and not inside v-for,
+    // we can reuse the same tree.
+    if (tree && !isInFor) {
+      return tree
     }
-    callHook(vm, 'beforeMount');
-
-    var updateComponent;
-    /* istanbul ignore if */
-    if (config.performance && mark) {
-      updateComponent = function () {
-        var name = vm._name;
-        var id = vm._uid;
-        var startTag = "vue-perf-start:" + id;
-        var endTag = "vue-perf-end:" + id;
+    // otherwise, render a fresh tree.
+    tree = cached[index] = this.$options.staticRenderFns[index].call(
+      this._renderProxy,
+      null,
+      this // for render fns generated for functional component templates
+    );
+    markStatic(tree, ("__static__" + index), false);
+    return tree
+  }
 
-        mark(startTag);
-        var vnode = vm._render();
-        mark(endTag);
-        measure(("vue " + name + " render"), startTag, endTag);
+  /**
+   * Runtime helper for v-once.
+   * Effectively it means marking the node as static with a unique key.
+   */
+  function markOnce (
+    tree,
+    index,
+    key
+  ) {
+    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+    return tree
+  }
 
-        mark(startTag);
-        vm._update(vnode, hydrating);
-        mark(endTag);
-        measure(("vue " + name + " patch"), startTag, endTag);
-      };
+  function markStatic (
+    tree,
+    key,
+    isOnce
+  ) {
+    if (Array.isArray(tree)) {
+      for (var i = 0; i < tree.length; i++) {
+        if (tree[i] && typeof tree[i] !== 'string') {
+          markStaticNode(tree[i], (key + "_" + i), isOnce);
+        }
+      }
     } else {
-      updateComponent = function () {
-        vm._update(vm._render(), hydrating);
-      };
+      markStaticNode(tree, key, isOnce);
     }
+  }
 
-    // we set this to vm._watcher inside the watcher's constructor
-    // since the watcher's initial patch may call $forceUpdate (e.g. inside child
-    // component's mounted hook), which relies on vm._watcher being already defined
-    new Watcher(vm, updateComponent, noop, {
-      before: function before () {
-        if (vm._isMounted && !vm._isDestroyed) {
-          callHook(vm, 'beforeUpdate');
+  function markStaticNode (node, key, isOnce) {
+    node.isStatic = true;
+    node.key = key;
+    node.isOnce = isOnce;
+  }
+
+  /*  */
+
+  function bindObjectListeners (data, value) {
+    if (value) {
+      if (!isPlainObject(value)) {
+        warn(
+          'v-on without argument expects an Object value',
+          this
+        );
+      } else {
+        var on = data.on = data.on ? extend({}, data.on) : {};
+        for (var key in value) {
+          var existing = on[key];
+          var ours = value[key];
+          on[key] = existing ? [].concat(existing, ours) : ours;
         }
       }
-    }, true /* isRenderWatcher */);
-    hydrating = false;
-
-    // manually mounted instance, call mounted on self
-    // mounted is called for render-created child components in its inserted hook
-    if (vm.$vnode == null) {
-      vm._isMounted = true;
-      callHook(vm, 'mounted');
     }
-    return vm
+    return data
   }
 
-  function updateChildComponent (
-    vm,
-    propsData,
-    listeners,
-    parentVnode,
-    renderChildren
+  /*  */
+
+  function resolveScopedSlots (
+    fns, // see flow/vnode
+    hasDynamicKeys,
+    res
   ) {
-    {
-      isUpdatingChildComponent = true;
+    res = res || { $stable: !hasDynamicKeys };
+    for (var i = 0; i < fns.length; i++) {
+      var slot = fns[i];
+      if (Array.isArray(slot)) {
+        resolveScopedSlots(slot, hasDynamicKeys, res);
+      } else if (slot) {
+        res[slot.key] = slot.fn;
+      }
     }
+    return res
+  }
 
-    // determine whether component has slot children
-    // we need to do this before overwriting $options._renderChildren.
+  /*  */
 
-    // check if there are dynamic scopedSlots (hand-written or compiled but with
-    // dynamic slot names). Static scoped slots compiled from template has the
-    // "$stable" marker.
-    var hasDynamicScopedSlot = !!(
-      (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-      (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-    );
-    // Any static slot children from the parent may have changed during parent's
-    // update. Dynamic scoped slots may also have changed. In such cases, a forced
-    // update is necessary to ensure correctness.
-    var needsForceUpdate = !!(
-      renderChildren ||               // has new static slots
-      vm.$options._renderChildren ||  // has old static slots
-      hasDynamicScopedSlot
-    );
+  function bindDynamicKeys (baseObj, values) {
+    for (var i = 0; i < values.length; i += 2) {
+      var key = values[i];
+      if (typeof key === 'string' && key) {
+        baseObj[values[i]] = values[i + 1];
+      } else if (key !== '' && key !== null) {
+        // null is a speical value for explicitly removing a binding
+        warn(
+          ("Invalid value for dynamic directive argument (expected string or null): " + key),
+          this
+        );
+      }
+    }
+    return baseObj
+  }
 
-    vm.$options._parentVnode = parentVnode;
-    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+  // helper to dynamically append modifier runtime markers to event names.
+  // ensure only append when value is already string, otherwise it will be cast
+  // to string and cause the type check to miss.
+  function prependModifier (value, symbol) {
+    return typeof value === 'string' ? symbol + value : value
+  }
 
-    if (vm._vnode) { // update child tree's parent
-      vm._vnode.parent = parentVnode;
-    }
-    vm.$options._renderChildren = renderChildren;
+  /*  */
 
-    // update $attrs and $listeners hash
-    // these are also reactive so they may trigger child update if the child
-    // used them during render
-    vm.$attrs = parentVnode.data.attrs || emptyObject;
-    vm.$listeners = listeners || emptyObject;
+  function installRenderHelpers (target) {
+    target._o = markOnce;
+    target._n = toNumber;
+    target._s = toString;
+    target._l = renderList;
+    target._t = renderSlot;
+    target._q = looseEqual;
+    target._i = looseIndexOf;
+    target._m = renderStatic;
+    target._f = resolveFilter;
+    target._k = checkKeyCodes;
+    target._b = bindObjectProps;
+    target._v = createTextVNode;
+    target._e = createEmptyVNode;
+    target._u = resolveScopedSlots;
+    target._g = bindObjectListeners;
+    target._d = bindDynamicKeys;
+    target._p = prependModifier;
+  }
 
-    // update props
-    if (propsData && vm.$options.props) {
-      toggleObserving(false);
-      var props = vm._props;
-      var propKeys = vm.$options._propKeys || [];
-      for (var i = 0; i < propKeys.length; i++) {
-        var key = propKeys[i];
-        var propOptions = vm.$options.props; // wtf flow?
-        props[key] = validateProp(key, propOptions, propsData, vm);
-      }
-      toggleObserving(true);
-      // keep a copy of raw propsData
-      vm.$options.propsData = propsData;
+  /*  */
+
+  function FunctionalRenderContext (
+    data,
+    props,
+    children,
+    parent,
+    Ctor
+  ) {
+    var options = Ctor.options;
+    // ensure the createElement function in functional components
+    // gets a unique context - this is necessary for correct named slot check
+    var contextVm;
+    if (hasOwn(parent, '_uid')) {
+      contextVm = Object.create(parent);
+      // $flow-disable-line
+      contextVm._original = parent;
+    } else {
+      // the context vm passed in is a functional context as well.
+      // in this case we want to make sure we are able to get a hold to the
+      // real context instance.
+      contextVm = parent;
+      // $flow-disable-line
+      parent = parent._original;
     }
+    var isCompiled = isTrue(options._compiled);
+    var needNormalization = !isCompiled;
 
-    // update listeners
-    listeners = listeners || emptyObject;
-    var oldListeners = vm.$options._parentListeners;
-    vm.$options._parentListeners = listeners;
-    updateComponentListeners(vm, listeners, oldListeners);
+    this.data = data;
+    this.props = props;
+    this.children = children;
+    this.parent = parent;
+    this.listeners = data.on || emptyObject;
+    this.injections = resolveInject(options.inject, parent);
+    this.slots = function () { return resolveSlots(children, parent); };
 
-    // resolve slots + force update if has children
-    if (needsForceUpdate) {
-      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-      vm.$forceUpdate();
-    }
+    Object.defineProperty(this, 'scopedSlots', ({
+      enumerable: true,
+      get: function get () {
+        return normalizeScopedSlots(data.scopedSlots, this.slots())
+      }
+    }));
 
-    {
-      isUpdatingChildComponent = false;
+    // support for compiled functional template
+    if (isCompiled) {
+      // exposing $options for renderStatic()
+      this.$options = options;
+      // pre-resolve slots for renderSlot()
+      this.$slots = this.slots();
+      this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
     }
-  }
 
-  function isInInactiveTree (vm) {
-    while (vm && (vm = vm.$parent)) {
-      if (vm._inactive) { return true }
+    if (options._scopeId) {
+      this._c = function (a, b, c, d) {
+        var vnode = createElement(contextVm, a, b, c, d, needNormalization);
+        if (vnode && !Array.isArray(vnode)) {
+          vnode.fnScopeId = options._scopeId;
+          vnode.fnContext = parent;
+        }
+        return vnode
+      };
+    } else {
+      this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
     }
-    return false
   }
 
-  function activateChildComponent (vm, direct) {
-    if (direct) {
-      vm._directInactive = false;
-      if (isInInactiveTree(vm)) {
-        return
+  installRenderHelpers(FunctionalRenderContext.prototype);
+
+  function createFunctionalComponent (
+    Ctor,
+    propsData,
+    data,
+    contextVm,
+    children
+  ) {
+    var options = Ctor.options;
+    var props = {};
+    var propOptions = options.props;
+    if (isDef(propOptions)) {
+      for (var key in propOptions) {
+        props[key] = validateProp(key, propOptions, propsData || emptyObject);
       }
-    } else if (vm._directInactive) {
-      return
+    } else {
+      if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
+      if (isDef(data.props)) { mergeProps(props, data.props); }
     }
-    if (vm._inactive || vm._inactive === null) {
-      vm._inactive = false;
-      for (var i = 0; i < vm.$children.length; i++) {
-        activateChildComponent(vm.$children[i]);
+
+    var renderContext = new FunctionalRenderContext(
+      data,
+      props,
+      children,
+      contextVm,
+      Ctor
+    );
+
+    var vnode = options.render.call(null, renderContext._c, renderContext);
+
+    if (vnode instanceof VNode) {
+      return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+    } else if (Array.isArray(vnode)) {
+      var vnodes = normalizeChildren(vnode) || [];
+      var res = new Array(vnodes.length);
+      for (var i = 0; i < vnodes.length; i++) {
+        res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
       }
-      callHook(vm, 'activated');
+      return res
     }
   }
 
-  function deactivateChildComponent (vm, direct) {
-    if (direct) {
-      vm._directInactive = true;
-      if (isInInactiveTree(vm)) {
-        return
-      }
+  function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+    // #7817 clone node before setting fnContext, otherwise if the node is reused
+    // (e.g. it was from a cached normal slot) the fnContext causes named slots
+    // that should not be matched to match.
+    var clone = cloneVNode(vnode);
+    clone.fnContext = contextVm;
+    clone.fnOptions = options;
+    {
+      (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
     }
-    if (!vm._inactive) {
-      vm._inactive = true;
-      for (var i = 0; i < vm.$children.length; i++) {
-        deactivateChildComponent(vm.$children[i]);
-      }
-      callHook(vm, 'deactivated');
+    if (data.slot) {
+      (clone.data || (clone.data = {})).slot = data.slot;
     }
+    return clone
   }
 
-  function callHook (vm, hook) {
-    // #7573 disable dep collection when invoking lifecycle hooks
-    pushTarget();
-    var handlers = vm.$options[hook];
-    var info = hook + " hook";
-    if (handlers) {
-      for (var i = 0, j = handlers.length; i < j; i++) {
-        invokeWithErrorHandling(handlers[i], vm, null, vm, info);
-      }
-    }
-    if (vm._hasHookEvent) {
-      vm.$emit('hook:' + hook);
+  function mergeProps (to, from) {
+    for (var key in from) {
+      to[camelize(key)] = from[key];
     }
-    popTarget();
   }
 
   /*  */
 
-  var MAX_UPDATE_COUNT = 100;
+  /*  */
 
-  var queue = [];
-  var activatedChildren = [];
-  var has = {};
-  var circular = {};
-  var waiting = false;
-  var flushing = false;
-  var index = 0;
+  /*  */
 
-  /**
-   * Reset the scheduler's state.
-   */
-  function resetSchedulerState () {
-    index = queue.length = activatedChildren.length = 0;
-    has = {};
-    {
-      circular = {};
-    }
-    waiting = flushing = false;
-  }
+  /*  */
 
-  // Async edge case #6566 requires saving the timestamp when event listeners are
-  // attached. However, calling performance.now() has a perf overhead especially
-  // if the page has thousands of event listeners. Instead, we take a timestamp
-  // every time the scheduler flushes and use that for all event listeners
-  // attached during that flush.
-  var currentFlushTimestamp = 0;
+  // inline hooks to be invoked on component VNodes during patch
+  var componentVNodeHooks = {
+    init: function init (vnode, hydrating) {
+      if (
+        vnode.componentInstance &&
+        !vnode.componentInstance._isDestroyed &&
+        vnode.data.keepAlive
+      ) {
+        // kept-alive components, treat as a patch
+        var mountedNode = vnode; // work around flow
+        componentVNodeHooks.prepatch(mountedNode, mountedNode);
+      } else {
+        var child = vnode.componentInstance = createComponentInstanceForVnode(
+          vnode,
+          activeInstance
+        );
+        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
+      }
+    },
 
-  // Async edge case fix requires storing an event listener's attach timestamp.
-  var getNow = Date.now;
+    prepatch: function prepatch (oldVnode, vnode) {
+      var options = vnode.componentOptions;
+      var child = vnode.componentInstance = oldVnode.componentInstance;
+      updateChildComponent(
+        child,
+        options.propsData, // updated props
+        options.listeners, // updated listeners
+        vnode, // new parent vnode
+        options.children // new children
+      );
+    },
 
-  // Determine what event timestamp the browser is using. Annoyingly, the
-  // timestamp can either be hi-res ( relative to poge load) or low-res
-  // (relative to UNIX epoch), so in order to compare time we have to use the
-  // same timestamp type when saving the flush timestamp.
-  if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-    // if the low-res timestamp which is bigger than the event timestamp
-    // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-    // and we need to use the hi-res version for event listeners as well.
-    getNow = function () { return performance.now(); };
-  }
+    insert: function insert (vnode) {
+      var context = vnode.context;
+      var componentInstance = vnode.componentInstance;
+      if (!componentInstance._isMounted) {
+        componentInstance._isMounted = true;
+        callHook(componentInstance, 'mounted');
+      }
+      if (vnode.data.keepAlive) {
+        if (context._isMounted) {
+          // vue-router#1212
+          // During updates, a kept-alive component's child components may
+          // change, so directly walking the tree here may call activated hooks
+          // on incorrect children. Instead we push them into a queue which will
+          // be processed after the whole patch process ended.
+          queueActivatedComponent(componentInstance);
+        } else {
+          activateChildComponent(componentInstance, true /* direct */);
+        }
+      }
+    },
 
-  /**
-   * Flush both queues and run the watchers.
-   */
-  function flushSchedulerQueue () {
-    currentFlushTimestamp = getNow();
-    flushing = true;
-    var watcher, id;
+    destroy: function destroy (vnode) {
+      var componentInstance = vnode.componentInstance;
+      if (!componentInstance._isDestroyed) {
+        if (!vnode.data.keepAlive) {
+          componentInstance.$destroy();
+        } else {
+          deactivateChildComponent(componentInstance, true /* direct */);
+        }
+      }
+    }
+  };
 
-    // Sort queue before flush.
-    // This ensures that:
-    // 1. Components are updated from parent to child. (because parent is always
-    //    created before the child)
-    // 2. A component's user watchers are run before its render watcher (because
-    //    user watchers are created before the render watcher)
-    // 3. If a component is destroyed during a parent component's watcher run,
-    //    its watchers can be skipped.
-    queue.sort(function (a, b) { return a.id - b.id; });
+  var hooksToMerge = Object.keys(componentVNodeHooks);
 
-    // do not cache length because more watchers might be pushed
-    // as we run existing watchers
-    for (index = 0; index < queue.length; index++) {
-      watcher = queue[index];
-      if (watcher.before) {
-        watcher.before();
+  function createComponent (
+    Ctor,
+    data,
+    context,
+    children,
+    tag
+  ) {
+    if (isUndef(Ctor)) {
+      return
+    }
+
+    var baseCtor = context.$options._base;
+
+    // plain options object: turn it into a constructor
+    if (isObject(Ctor)) {
+      Ctor = baseCtor.extend(Ctor);
+    }
+
+    // if at this stage it's not a constructor or an async component factory,
+    // reject.
+    if (typeof Ctor !== 'function') {
+      {
+        warn(("Invalid Component definition: " + (String(Ctor))), context);
       }
-      id = watcher.id;
-      has[id] = null;
-      watcher.run();
-      // in dev build, check and stop circular updates.
-      if (has[id] != null) {
-        circular[id] = (circular[id] || 0) + 1;
-        if (circular[id] > MAX_UPDATE_COUNT) {
-          warn(
-            'You may have an infinite update loop ' + (
-              watcher.user
-                ? ("in watcher with expression \"" + (watcher.expression) + "\"")
-                : "in a component render function."
-            ),
-            watcher.vm
-          );
-          break
-        }
+      return
+    }
+
+    // async component
+    var asyncFactory;
+    if (isUndef(Ctor.cid)) {
+      asyncFactory = Ctor;
+      Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+      if (Ctor === undefined) {
+        // return a placeholder node for async component, which is rendered
+        // as a comment node but preserves all the raw information for the node.
+        // the information will be used for async server-rendering and hydration.
+        return createAsyncPlaceholder(
+          asyncFactory,
+          data,
+          context,
+          children,
+          tag
+        )
       }
     }
 
-    // keep copies of post queues before resetting state
-    var activatedQueue = activatedChildren.slice();
-    var updatedQueue = queue.slice();
+    data = data || {};
 
-    resetSchedulerState();
+    // resolve constructor options in case global mixins are applied after
+    // component constructor creation
+    resolveConstructorOptions(Ctor);
 
-    // call component updated and activated hooks
-    callActivatedHooks(activatedQueue);
-    callUpdatedHooks(updatedQueue);
+    // transform component v-model data into props & events
+    if (isDef(data.model)) {
+      transformModel(Ctor.options, data);
+    }
 
-    // devtool hook
-    /* istanbul ignore if */
-    if (devtools && config.devtools) {
-      devtools.emit('flush');
+    // extract props
+    var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+
+    // functional component
+    if (isTrue(Ctor.options.functional)) {
+      return createFunctionalComponent(Ctor, propsData, data, context, children)
     }
-  }
 
-  function callUpdatedHooks (queue) {
-    var i = queue.length;
-    while (i--) {
-      var watcher = queue[i];
-      var vm = watcher.vm;
-      if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
-        callHook(vm, 'updated');
+    // extract listeners, since these needs to be treated as
+    // child component listeners instead of DOM listeners
+    var listeners = data.on;
+    // replace with listeners with .native modifier
+    // so it gets processed during parent component patch.
+    data.on = data.nativeOn;
+
+    if (isTrue(Ctor.options.abstract)) {
+      // abstract components do not keep anything
+      // other than props & listeners & slot
+
+      // work around flow
+      var slot = data.slot;
+      data = {};
+      if (slot) {
+        data.slot = slot;
       }
     }
-  }
 
-  /**
-   * Queue a kept-alive component that was activated during patch.
-   * The queue will be processed after the entire tree has been patched.
-   */
-  function queueActivatedComponent (vm) {
-    // setting _inactive to false here so that a render function can
-    // rely on checking whether it's in an inactive tree (e.g. router-view)
-    vm._inactive = false;
-    activatedChildren.push(vm);
+    // install component management hooks onto the placeholder node
+    installComponentHooks(data);
+
+    // return a placeholder vnode
+    var name = Ctor.options.name || tag;
+    var vnode = new VNode(
+      ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
+      data, undefined, undefined, undefined, context,
+      { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
+      asyncFactory
+    );
+
+    return vnode
   }
 
-  function callActivatedHooks (queue) {
-    for (var i = 0; i < queue.length; i++) {
-      queue[i]._inactive = true;
-      activateChildComponent(queue[i], true /* true */);
+  function createComponentInstanceForVnode (
+    vnode, // we know it's MountedComponentVNode but flow doesn't
+    parent // activeInstance in lifecycle state
+  ) {
+    var options = {
+      _isComponent: true,
+      _parentVnode: vnode,
+      parent: parent
+    };
+    // check inline-template render functions
+    var inlineTemplate = vnode.data.inlineTemplate;
+    if (isDef(inlineTemplate)) {
+      options.render = inlineTemplate.render;
+      options.staticRenderFns = inlineTemplate.staticRenderFns;
     }
+    return new vnode.componentOptions.Ctor(options)
   }
 
-  /**
-   * Push a watcher into the watcher queue.
-   * Jobs with duplicate IDs will be skipped unless it's
-   * pushed when the queue is being flushed.
-   */
-  function queueWatcher (watcher) {
-    var id = watcher.id;
-    if (has[id] == null) {
-      has[id] = true;
-      if (!flushing) {
-        queue.push(watcher);
-      } else {
-        // if already flushing, splice the watcher based on its id
-        // if already past its id, it will be run next immediately.
-        var i = queue.length - 1;
-        while (i > index && queue[i].id > watcher.id) {
-          i--;
-        }
-        queue.splice(i + 1, 0, watcher);
+  function installComponentHooks (data) {
+    var hooks = data.hook || (data.hook = {});
+    for (var i = 0; i < hooksToMerge.length; i++) {
+      var key = hooksToMerge[i];
+      var existing = hooks[key];
+      var toMerge = componentVNodeHooks[key];
+      if (existing !== toMerge && !(existing && existing._merged)) {
+        hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
       }
-      // queue the flush
-      if (!waiting) {
-        waiting = true;
+    }
+  }
 
-        if (!config.async) {
-          flushSchedulerQueue();
-          return
-        }
-        nextTick(flushSchedulerQueue);
+  function mergeHook$1 (f1, f2) {
+    var merged = function (a, b) {
+      // flow complains about extra args which is why we use any
+      f1(a, b);
+      f2(a, b);
+    };
+    merged._merged = true;
+    return merged
+  }
+
+  // transform component v-model info (value and callback) into
+  // prop and event handler respectively.
+  function transformModel (options, data) {
+    var prop = (options.model && options.model.prop) || 'value';
+    var event = (options.model && options.model.event) || 'input'
+    ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+    var on = data.on || (data.on = {});
+    var existing = on[event];
+    var callback = data.model.callback;
+    if (isDef(existing)) {
+      if (
+        Array.isArray(existing)
+          ? existing.indexOf(callback) === -1
+          : existing !== callback
+      ) {
+        on[event] = [callback].concat(existing);
       }
+    } else {
+      on[event] = callback;
     }
   }
 
   /*  */
 
+  var SIMPLE_NORMALIZE = 1;
+  var ALWAYS_NORMALIZE = 2;
 
+  // wrapper function for providing a more flexible interface
+  // without getting yelled at by flow
+  function createElement (
+    context,
+    tag,
+    data,
+    children,
+    normalizationType,
+    alwaysNormalize
+  ) {
+    if (Array.isArray(data) || isPrimitive(data)) {
+      normalizationType = children;
+      children = data;
+      data = undefined;
+    }
+    if (isTrue(alwaysNormalize)) {
+      normalizationType = ALWAYS_NORMALIZE;
+    }
+    return _createElement(context, tag, data, children, normalizationType)
+  }
 
-  var uid$1 = 0;
-
-  /**
-   * A watcher parses an expression, collects dependencies,
-   * and fires callback when the expression value changes.
-   * This is used for both the $watch() api and directives.
-   */
-  var Watcher = function Watcher (
-    vm,
-    expOrFn,
-    cb,
-    options,
-    isRenderWatcher
+  function _createElement (
+    context,
+    tag,
+    data,
+    children,
+    normalizationType
   ) {
-    this.vm = vm;
-    if (isRenderWatcher) {
-      vm._watcher = this;
+    if (isDef(data) && isDef((data).__ob__)) {
+      warn(
+        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+        'Always create fresh vnode data objects in each render!',
+        context
+      );
+      return createEmptyVNode()
     }
-    vm._watchers.push(this);
-    // options
-    if (options) {
-      this.deep = !!options.deep;
-      this.user = !!options.user;
-      this.lazy = !!options.lazy;
-      this.sync = !!options.sync;
-      this.before = options.before;
+    // object syntax in v-bind
+    if (isDef(data) && isDef(data.is)) {
+      tag = data.is;
+    }
+    if (!tag) {
+      // in case of component :is set to falsy value
+      return createEmptyVNode()
+    }
+    // warn against non-primitive key
+    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+    ) {
+      {
+        warn(
+          'Avoid using non-primitive value as key, ' +
+          'use string/number value instead.',
+          context
+        );
+      }
+    }
+    // support single function children as default scoped slot
+    if (Array.isArray(children) &&
+      typeof children[0] === 'function'
+    ) {
+      data = data || {};
+      data.scopedSlots = { default: children[0] };
+      children.length = 0;
+    }
+    if (normalizationType === ALWAYS_NORMALIZE) {
+      children = normalizeChildren(children);
+    } else if (normalizationType === SIMPLE_NORMALIZE) {
+      children = simpleNormalizeChildren(children);
+    }
+    var vnode, ns;
+    if (typeof tag === 'string') {
+      var Ctor;
+      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+      if (config.isReservedTag(tag)) {
+        // platform built-in elements
+        vnode = new VNode(
+          config.parsePlatformTagName(tag), data, children,
+          undefined, undefined, context
+        );
+      } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+        // component
+        vnode = createComponent(Ctor, data, context, children, tag);
+      } else {
+        // unknown or unlisted namespaced elements
+        // check at runtime because it may get assigned a namespace when its
+        // parent normalizes children
+        vnode = new VNode(
+          tag, data, children,
+          undefined, undefined, context
+        );
+      }
     } else {
-      this.deep = this.user = this.lazy = this.sync = false;
+      // direct component options / constructor
+      vnode = createComponent(tag, data, context, children);
     }
-    this.cb = cb;
-    this.id = ++uid$1; // uid for batching
-    this.active = true;
-    this.dirty = this.lazy; // for lazy watchers
-    this.deps = [];
-    this.newDeps = [];
-    this.depIds = new _Set();
-    this.newDepIds = new _Set();
-    this.expression = expOrFn.toString();
-    // parse expression for getter
-    if (typeof expOrFn === 'function') {
-      this.getter = expOrFn;
+    if (Array.isArray(vnode)) {
+      return vnode
+    } else if (isDef(vnode)) {
+      if (isDef(ns)) { applyNS(vnode, ns); }
+      if (isDef(data)) { registerDeepBindings(data); }
+      return vnode
     } else {
-      this.getter = parsePath(expOrFn);
-      if (!this.getter) {
-        this.getter = noop;
-        warn(
-          "Failed watching path: \"" + expOrFn + "\" " +
-          'Watcher only accepts simple dot-delimited paths. ' +
-          'For full control, use a function instead.',
-          vm
-        );
-      }
+      return createEmptyVNode()
     }
-    this.value = this.lazy
-      ? undefined
-      : this.get();
-  };
+  }
 
-  /**
-   * Evaluate the getter, and re-collect dependencies.
-   */
-  Watcher.prototype.get = function get () {
-    pushTarget(this);
-    var value;
-    var vm = this.vm;
-    try {
-      value = this.getter.call(vm, vm);
-    } catch (e) {
-      if (this.user) {
-        handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
-      } else {
-        throw e
-      }
-    } finally {
-      // "touch" every property so they are all tracked as
-      // dependencies for deep watching
-      if (this.deep) {
-        traverse(value);
-      }
-      popTarget();
-      this.cleanupDeps();
+  function applyNS (vnode, ns, force) {
+    vnode.ns = ns;
+    if (vnode.tag === 'foreignObject') {
+      // use default namespace inside foreignObject
+      ns = undefined;
+      force = true;
     }
-    return value
-  };
-
-  /**
-   * Add a dependency to this directive.
-   */
-  Watcher.prototype.addDep = function addDep (dep) {
-    var id = dep.id;
-    if (!this.newDepIds.has(id)) {
-      this.newDepIds.add(id);
-      this.newDeps.push(dep);
-      if (!this.depIds.has(id)) {
-        dep.addSub(this);
+    if (isDef(vnode.children)) {
+      for (var i = 0, l = vnode.children.length; i < l; i++) {
+        var child = vnode.children[i];
+        if (isDef(child.tag) && (
+          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+          applyNS(child, ns, force);
+        }
       }
     }
-  };
+  }
 
-  /**
-   * Clean up for dependency collection.
-   */
-  Watcher.prototype.cleanupDeps = function cleanupDeps () {
-    var i = this.deps.length;
-    while (i--) {
-      var dep = this.deps[i];
-      if (!this.newDepIds.has(dep.id)) {
-        dep.removeSub(this);
-      }
+  // ref #5318
+  // necessary to ensure parent re-render when deep bindings like :style and
+  // :class are used on slot nodes
+  function registerDeepBindings (data) {
+    if (isObject(data.style)) {
+      traverse(data.style);
     }
-    var tmp = this.depIds;
-    this.depIds = this.newDepIds;
-    this.newDepIds = tmp;
-    this.newDepIds.clear();
-    tmp = this.deps;
-    this.deps = this.newDeps;
-    this.newDeps = tmp;
-    this.newDeps.length = 0;
-  };
+    if (isObject(data.class)) {
+      traverse(data.class);
+    }
+  }
+
+  /*  */
+
+  function initRender (vm) {
+    vm._vnode = null; // the root of the child tree
+    vm._staticTrees = null; // v-once cached trees
+    var options = vm.$options;
+    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+    var renderContext = parentVnode && parentVnode.context;
+    vm.$slots = resolveSlots(options._renderChildren, renderContext);
+    vm.$scopedSlots = emptyObject;
+    // bind the createElement fn to this instance
+    // so that we get proper render context inside it.
+    // args order: tag, data, children, normalizationType, alwaysNormalize
+    // internal version is used by render functions compiled from templates
+    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
+    // normalization is always applied for the public version, used in
+    // user-written render functions.
+    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+
+    // $attrs & $listeners are exposed for easier HOC creation.
+    // they need to be reactive so that HOCs using them are always updated
+    var parentData = parentVnode && parentVnode.data;
 
-  /**
-   * Subscriber interface.
-   * Will be called when a dependency changes.
-   */
-  Watcher.prototype.update = function update () {
     /* istanbul ignore else */
-    if (this.lazy) {
-      this.dirty = true;
-    } else if (this.sync) {
-      this.run();
-    } else {
-      queueWatcher(this);
+    {
+      defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
+        !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
+      }, true);
+      defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
+        !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
+      }, true);
     }
-  };
+  }
 
-  /**
-   * Scheduler job interface.
-   * Will be called by the scheduler.
-   */
-  Watcher.prototype.run = function run () {
-    if (this.active) {
-      var value = this.get();
-      if (
-        value !== this.value ||
-        // Deep watchers and watchers on Object/Arrays should fire even
-        // when the value is the same, because the value may
-        // have mutated.
-        isObject(value) ||
-        this.deep
-      ) {
-        // set new value
-        var oldValue = this.value;
-        this.value = value;
-        if (this.user) {
-          try {
-            this.cb.call(this.vm, value, oldValue);
-          } catch (e) {
-            handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
-          }
-        } else {
-          this.cb.call(this.vm, value, oldValue);
-        }
-      }
-    }
-  };
+  var currentRenderingInstance = null;
 
-  /**
-   * Evaluate the value of the watcher.
-   * This only gets called for lazy watchers.
-   */
-  Watcher.prototype.evaluate = function evaluate () {
-    this.value = this.get();
-    this.dirty = false;
-  };
+  function renderMixin (Vue) {
+    // install runtime convenience helpers
+    installRenderHelpers(Vue.prototype);
 
-  /**
-   * Depend on all deps collected by this watcher.
-   */
-  Watcher.prototype.depend = function depend () {
-    var i = this.deps.length;
-    while (i--) {
-      this.deps[i].depend();
-    }
-  };
+    Vue.prototype.$nextTick = function (fn) {
+      return nextTick(fn, this)
+    };
 
-  /**
-   * Remove self from all dependencies' subscriber list.
-   */
-  Watcher.prototype.teardown = function teardown () {
-    if (this.active) {
-      // remove self from vm's watcher list
-      // this is a somewhat expensive operation so we skip it
-      // if the vm is being destroyed.
-      if (!this.vm._isBeingDestroyed) {
-        remove(this.vm._watchers, this);
+    Vue.prototype._render = function () {
+      var vm = this;
+      var ref = vm.$options;
+      var render = ref.render;
+      var _parentVnode = ref._parentVnode;
+
+      if (_parentVnode) {
+        vm.$scopedSlots = normalizeScopedSlots(
+          _parentVnode.data.scopedSlots,
+          vm.$slots
+        );
+      }
+
+      // set parent vnode. this allows render functions to have access
+      // to the data on the placeholder node.
+      vm.$vnode = _parentVnode;
+      // render self
+      var vnode;
+      try {
+        // There's no need to maintain a stack becaues all render fns are called
+        // separately from one another. Nested component's render fns are called
+        // when parent component is patched.
+        currentRenderingInstance = vm;
+        vnode = render.call(vm._renderProxy, vm.$createElement);
+      } catch (e) {
+        handleError(e, vm, "render");
+        // return error render result,
+        // or previous vnode to prevent render error causing blank component
+        /* istanbul ignore else */
+        if (vm.$options.renderError) {
+          try {
+            vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+          } catch (e) {
+            handleError(e, vm, "renderError");
+            vnode = vm._vnode;
+          }
+        } else {
+          vnode = vm._vnode;
+        }
+      } finally {
+        currentRenderingInstance = null;
       }
-      var i = this.deps.length;
-      while (i--) {
-        this.deps[i].removeSub(this);
+      // if the returned array contains only a single node, allow it
+      if (Array.isArray(vnode) && vnode.length === 1) {
+        vnode = vnode[0];
       }
-      this.active = false;
-    }
-  };
+      // return empty vnode in case the render function errored out
+      if (!(vnode instanceof VNode)) {
+        if (Array.isArray(vnode)) {
+          warn(
+            'Multiple root nodes returned from render function. Render function ' +
+            'should return a single root node.',
+            vm
+          );
+        }
+        vnode = createEmptyVNode();
+      }
+      // set parent
+      vnode.parent = _parentVnode;
+      return vnode
+    };
+  }
 
   /*  */
 
-  var sharedPropertyDefinition = {
-    enumerable: true,
-    configurable: true,
-    get: noop,
-    set: noop
-  };
+  function ensureCtor (comp, base) {
+    if (
+      comp.__esModule ||
+      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+    ) {
+      comp = comp.default;
+    }
+    return isObject(comp)
+      ? base.extend(comp)
+      : comp
+  }
 
-  function proxy (target, sourceKey, key) {
-    sharedPropertyDefinition.get = function proxyGetter () {
-      return this[sourceKey][key]
-    };
-    sharedPropertyDefinition.set = function proxySetter (val) {
-      this[sourceKey][key] = val;
-    };
-    Object.defineProperty(target, key, sharedPropertyDefinition);
+  function createAsyncPlaceholder (
+    factory,
+    data,
+    context,
+    children,
+    tag
+  ) {
+    var node = createEmptyVNode();
+    node.asyncFactory = factory;
+    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+    return node
   }
 
-  function initState (vm) {
-    vm._watchers = [];
-    var opts = vm.$options;
-    if (opts.props) { initProps(vm, opts.props); }
-    if (opts.methods) { initMethods(vm, opts.methods); }
-    if (opts.data) {
-      initData(vm);
-    } else {
-      observe(vm._data = {}, true /* asRootData */);
+  function resolveAsyncComponent (
+    factory,
+    baseCtor
+  ) {
+    if (isTrue(factory.error) && isDef(factory.errorComp)) {
+      return factory.errorComp
     }
-    if (opts.computed) { initComputed(vm, opts.computed); }
-    if (opts.watch && opts.watch !== nativeWatch) {
-      initWatch(vm, opts.watch);
+
+    if (isDef(factory.resolved)) {
+      return factory.resolved
     }
-  }
 
-  function initProps (vm, propsOptions) {
-    var propsData = vm.$options.propsData || {};
-    var props = vm._props = {};
-    // cache prop keys so that future props updates can iterate using Array
-    // instead of dynamic object key enumeration.
-    var keys = vm.$options._propKeys = [];
-    var isRoot = !vm.$parent;
-    // root instance props should be converted
-    if (!isRoot) {
-      toggleObserving(false);
+    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+      return factory.loadingComp
     }
-    var loop = function ( key ) {
-      keys.push(key);
-      var value = validateProp(key, propsOptions, propsData, vm);
-      /* istanbul ignore else */
-      {
-        var hyphenatedKey = hyphenate(key);
-        if (isReservedAttribute(hyphenatedKey) ||
-            config.isReservedAttr(hyphenatedKey)) {
-          warn(
-            ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
-            vm
-          );
+
+    var owner = currentRenderingInstance;
+    if (isDef(factory.owners)) {
+      // already pending
+      factory.owners.push(owner);
+    } else {
+      var owners = factory.owners = [owner];
+      var sync = true;
+
+      var forceRender = function (renderCompleted) {
+        for (var i = 0, l = owners.length; i < l; i++) {
+          (owners[i]).$forceUpdate();
         }
-        defineReactive$$1(props, key, value, function () {
-          if (!isRoot && !isUpdatingChildComponent) {
-            warn(
-              "Avoid mutating a prop directly since the value will be " +
-              "overwritten whenever the parent component re-renders. " +
-              "Instead, use a data or computed property based on the prop's " +
-              "value. Prop being mutated: \"" + key + "\"",
-              vm
-            );
-          }
-        });
-      }
-      // static props are already proxied on the component's prototype
-      // during Vue.extend(). We only need to proxy props defined at
-      // instantiation here.
-      if (!(key in vm)) {
-        proxy(vm, "_props", key);
-      }
-    };
 
-    for (var key in propsOptions) loop( key );
-    toggleObserving(true);
-  }
+        if (renderCompleted) {
+          owners.length = 0;
+        }
+      };
 
-  function initData (vm) {
-    var data = vm.$options.data;
-    data = vm._data = typeof data === 'function'
-      ? getData(data, vm)
-      : data || {};
-    if (!isPlainObject(data)) {
-      data = {};
-      warn(
-        'data functions should return an object:\n' +
-        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
-        vm
-      );
-    }
-    // proxy data on instance
-    var keys = Object.keys(data);
-    var props = vm.$options.props;
-    var methods = vm.$options.methods;
-    var i = keys.length;
-    while (i--) {
-      var key = keys[i];
-      {
-        if (methods && hasOwn(methods, key)) {
-          warn(
-            ("Method \"" + key + "\" has already been defined as a data property."),
-            vm
-          );
+      var resolve = once(function (res) {
+        // cache resolved
+        factory.resolved = ensureCtor(res, baseCtor);
+        // invoke callbacks only if this is not a synchronous resolve
+        // (async resolves are shimmed as synchronous during SSR)
+        if (!sync) {
+          forceRender(true);
+        } else {
+          owners.length = 0;
         }
-      }
-      if (props && hasOwn(props, key)) {
+      });
+
+      var reject = once(function (reason) {
         warn(
-          "The data property \"" + key + "\" is already declared as a prop. " +
-          "Use prop default value instead.",
-          vm
+          "Failed to resolve async component: " + (String(factory)) +
+          (reason ? ("\nReason: " + reason) : '')
         );
-      } else if (!isReserved(key)) {
-        proxy(vm, "_data", key);
+        if (isDef(factory.errorComp)) {
+          factory.error = true;
+          forceRender(true);
+        }
+      });
+
+      var res = factory(resolve, reject);
+
+      if (isObject(res)) {
+        if (isPromise(res)) {
+          // () => Promise
+          if (isUndef(factory.resolved)) {
+            res.then(resolve, reject);
+          }
+        } else if (isPromise(res.component)) {
+          res.component.then(resolve, reject);
+
+          if (isDef(res.error)) {
+            factory.errorComp = ensureCtor(res.error, baseCtor);
+          }
+
+          if (isDef(res.loading)) {
+            factory.loadingComp = ensureCtor(res.loading, baseCtor);
+            if (res.delay === 0) {
+              factory.loading = true;
+            } else {
+              setTimeout(function () {
+                if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                  factory.loading = true;
+                  forceRender(false);
+                }
+              }, res.delay || 200);
+            }
+          }
+
+          if (isDef(res.timeout)) {
+            setTimeout(function () {
+              if (isUndef(factory.resolved)) {
+                reject(
+                  "timeout (" + (res.timeout) + "ms)"
+                );
+              }
+            }, res.timeout);
+          }
+        }
       }
-    }
-    // observe data
-    observe(data, true /* asRootData */);
-  }
 
-  function getData (data, vm) {
-    // #7573 disable dep collection when invoking data getters
-    pushTarget();
-    try {
-      return data.call(vm, vm)
-    } catch (e) {
-      handleError(e, vm, "data()");
-      return {}
-    } finally {
-      popTarget();
+      sync = false;
+      // return in case resolved synchronously
+      return factory.loading
+        ? factory.loadingComp
+        : factory.resolved
     }
   }
 
-  var computedWatcherOptions = { lazy: true };
-
-  function initComputed (vm, computed) {
-    // $flow-disable-line
-    var watchers = vm._computedWatchers = Object.create(null);
-    // computed properties are just getters during SSR
-    var isSSR = isServerRendering();
+  /*  */
 
-    for (var key in computed) {
-      var userDef = computed[key];
-      var getter = typeof userDef === 'function' ? userDef : userDef.get;
-      if (getter == null) {
-        warn(
-          ("Getter is missing for computed property \"" + key + "\"."),
-          vm
-        );
-      }
+  function isAsyncPlaceholder (node) {
+    return node.isComment && node.asyncFactory
+  }
 
-      if (!isSSR) {
-        // create internal watcher for the computed property.
-        watchers[key] = new Watcher(
-          vm,
-          getter || noop,
-          noop,
-          computedWatcherOptions
-        );
-      }
+  /*  */
 
-      // component-defined computed properties are already defined on the
-      // component prototype. We only need to define computed properties defined
-      // at instantiation here.
-      if (!(key in vm)) {
-        defineComputed(vm, key, userDef);
-      } else {
-        if (key in vm.$data) {
-          warn(("The computed property \"" + key + "\" is already defined in data."), vm);
-        } else if (vm.$options.props && key in vm.$options.props) {
-          warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+  function getFirstComponentChild (children) {
+    if (Array.isArray(children)) {
+      for (var i = 0; i < children.length; i++) {
+        var c = children[i];
+        if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+          return c
         }
       }
     }
   }
 
-  function defineComputed (
-    target,
-    key,
-    userDef
-  ) {
-    var shouldCache = !isServerRendering();
-    if (typeof userDef === 'function') {
-      sharedPropertyDefinition.get = shouldCache
-        ? createComputedGetter(key)
-        : createGetterInvoker(userDef);
-      sharedPropertyDefinition.set = noop;
-    } else {
-      sharedPropertyDefinition.get = userDef.get
-        ? shouldCache && userDef.cache !== false
-          ? createComputedGetter(key)
-          : createGetterInvoker(userDef.get)
-        : noop;
-      sharedPropertyDefinition.set = userDef.set || noop;
-    }
-    if (sharedPropertyDefinition.set === noop) {
-      sharedPropertyDefinition.set = function () {
-        warn(
-          ("Computed property \"" + key + "\" was assigned to but it has no setter."),
-          this
-        );
-      };
-    }
-    Object.defineProperty(target, key, sharedPropertyDefinition);
-  }
+  /*  */
 
-  function createComputedGetter (key) {
-    return function computedGetter () {
-      var watcher = this._computedWatchers && this._computedWatchers[key];
-      if (watcher) {
-        if (watcher.dirty) {
-          watcher.evaluate();
-        }
-        if (Dep.target) {
-          watcher.depend();
-        }
-        return watcher.value
-      }
+  /*  */
+
+  function initEvents (vm) {
+    vm._events = Object.create(null);
+    vm._hasHookEvent = false;
+    // init parent attached events
+    var listeners = vm.$options._parentListeners;
+    if (listeners) {
+      updateComponentListeners(vm, listeners);
     }
   }
 
-  function createGetterInvoker(fn) {
-    return function computedGetter () {
-      return fn.call(this, this)
-    }
+  var target;
+
+  function add (event, fn) {
+    target.$on(event, fn);
   }
 
-  function initMethods (vm, methods) {
-    var props = vm.$options.props;
-    for (var key in methods) {
-      {
-        if (typeof methods[key] !== 'function') {
-          warn(
-            "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
-            "Did you reference the function correctly?",
-            vm
-          );
-        }
-        if (props && hasOwn(props, key)) {
-          warn(
-            ("Method \"" + key + "\" has already been defined as a prop."),
-            vm
-          );
-        }
-        if ((key in vm) && isReserved(key)) {
-          warn(
-            "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
-            "Avoid defining component methods that start with _ or $."
-          );
-        }
-      }
-      vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
-    }
+  function remove$1 (event, fn) {
+    target.$off(event, fn);
   }
 
-  function initWatch (vm, watch) {
-    for (var key in watch) {
-      var handler = watch[key];
-      if (Array.isArray(handler)) {
-        for (var i = 0; i < handler.length; i++) {
-          createWatcher(vm, key, handler[i]);
-        }
-      } else {
-        createWatcher(vm, key, handler);
+  function createOnceHandler (event, fn) {
+    var _target = target;
+    return function onceHandler () {
+      var res = fn.apply(null, arguments);
+      if (res !== null) {
+        _target.$off(event, onceHandler);
       }
     }
   }
 
-  function createWatcher (
+  function updateComponentListeners (
     vm,
-    expOrFn,
-    handler,
-    options
+    listeners,
+    oldListeners
   ) {
-    if (isPlainObject(handler)) {
-      options = handler;
-      handler = handler.handler;
-    }
-    if (typeof handler === 'string') {
-      handler = vm[handler];
-    }
-    return vm.$watch(expOrFn, handler, options)
+    target = vm;
+    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+    target = undefined;
   }
 
-  function stateMixin (Vue) {
-    // flow somehow has problems with directly declared definition object
-    // when using Object.defineProperty, so we have to procedurally build up
-    // the object here.
-    var dataDef = {};
-    dataDef.get = function () { return this._data };
-    var propsDef = {};
-    propsDef.get = function () { return this._props };
-    {
-      dataDef.set = function () {
-        warn(
-          'Avoid replacing instance root $data. ' +
-          'Use nested data properties instead.',
-          this
-        );
-      };
-      propsDef.set = function () {
-        warn("$props is readonly.", this);
-      };
-    }
-    Object.defineProperty(Vue.prototype, '$data', dataDef);
-    Object.defineProperty(Vue.prototype, '$props', propsDef);
+  function eventsMixin (Vue) {
+    var hookRE = /^hook:/;
+    Vue.prototype.$on = function (event, fn) {
+      var vm = this;
+      if (Array.isArray(event)) {
+        for (var i = 0, l = event.length; i < l; i++) {
+          vm.$on(event[i], fn);
+        }
+      } else {
+        (vm._events[event] || (vm._events[event] = [])).push(fn);
+        // optimize hook:event cost by using a boolean flag marked at registration
+        // instead of a hash lookup
+        if (hookRE.test(event)) {
+          vm._hasHookEvent = true;
+        }
+      }
+      return vm
+    };
 
-    Vue.prototype.$set = set;
-    Vue.prototype.$delete = del;
+    Vue.prototype.$once = function (event, fn) {
+      var vm = this;
+      function on () {
+        vm.$off(event, on);
+        fn.apply(vm, arguments);
+      }
+      on.fn = fn;
+      vm.$on(event, on);
+      return vm
+    };
+
+    Vue.prototype.$off = function (event, fn) {
+      var vm = this;
+      // all
+      if (!arguments.length) {
+        vm._events = Object.create(null);
+        return vm
+      }
+      // array of events
+      if (Array.isArray(event)) {
+        for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
+          vm.$off(event[i$1], fn);
+        }
+        return vm
+      }
+      // specific event
+      var cbs = vm._events[event];
+      if (!cbs) {
+        return vm
+      }
+      if (!fn) {
+        vm._events[event] = null;
+        return vm
+      }
+      // specific handler
+      var cb;
+      var i = cbs.length;
+      while (i--) {
+        cb = cbs[i];
+        if (cb === fn || cb.fn === fn) {
+          cbs.splice(i, 1);
+          break
+        }
+      }
+      return vm
+    };
 
-    Vue.prototype.$watch = function (
-      expOrFn,
-      cb,
-      options
-    ) {
+    Vue.prototype.$emit = function (event) {
       var vm = this;
-      if (isPlainObject(cb)) {
-        return createWatcher(vm, expOrFn, cb, options)
-      }
-      options = options || {};
-      options.user = true;
-      var watcher = new Watcher(vm, expOrFn, cb, options);
-      if (options.immediate) {
-        try {
-          cb.call(vm, watcher.value);
-        } catch (error) {
-          handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
+      {
+        var lowerCaseEvent = event.toLowerCase();
+        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+          tip(
+            "Event \"" + lowerCaseEvent + "\" is emitted in component " +
+            (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
+            "Note that HTML attributes are case-insensitive and you cannot use " +
+            "v-on to listen to camelCase events when using in-DOM templates. " +
+            "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
+          );
         }
       }
-      return function unwatchFn () {
-        watcher.teardown();
+      var cbs = vm._events[event];
+      if (cbs) {
+        cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+        var args = toArray(arguments, 1);
+        var info = "event handler for \"" + event + "\"";
+        for (var i = 0, l = cbs.length; i < l; i++) {
+          invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+        }
       }
+      return vm
     };
   }
 
   /*  */
 
-  function initProvide (vm) {
-    var provide = vm.$options.provide;
-    if (provide) {
-      vm._provided = typeof provide === 'function'
-        ? provide.call(vm)
-        : provide;
-    }
-  }
+  var activeInstance = null;
+  var isUpdatingChildComponent = false;
 
-  function initInjections (vm) {
-    var result = resolveInject(vm.$options.inject, vm);
-    if (result) {
-      toggleObserving(false);
-      Object.keys(result).forEach(function (key) {
-        /* istanbul ignore else */
-        {
-          defineReactive$$1(vm, key, result[key], function () {
-            warn(
-              "Avoid mutating an injected value directly since the changes will be " +
-              "overwritten whenever the provided component re-renders. " +
-              "injection being mutated: \"" + key + "\"",
-              vm
-            );
-          });
-        }
-      });
-      toggleObserving(true);
+  function setActiveInstance(vm) {
+    var prevActiveInstance = activeInstance;
+    activeInstance = vm;
+    return function () {
+      activeInstance = prevActiveInstance;
     }
   }
 
-  function resolveInject (inject, vm) {
-    if (inject) {
-      // inject is :any because flow is not smart enough to figure out cached
-      var result = Object.create(null);
-      var keys = hasSymbol
-        ? Reflect.ownKeys(inject)
-        : Object.keys(inject);
+  function initLifecycle (vm) {
+    var options = vm.$options;
 
-      for (var i = 0; i < keys.length; i++) {
-        var key = keys[i];
-        // #6574 in case the inject object is observed...
-        if (key === '__ob__') { continue }
-        var provideKey = inject[key].from;
-        var source = vm;
-        while (source) {
-          if (source._provided && hasOwn(source._provided, provideKey)) {
-            result[key] = source._provided[provideKey];
-            break
-          }
-          source = source.$parent;
-        }
-        if (!source) {
-          if ('default' in inject[key]) {
-            var provideDefault = inject[key].default;
-            result[key] = typeof provideDefault === 'function'
-              ? provideDefault.call(vm)
-              : provideDefault;
-          } else {
-            warn(("Injection \"" + key + "\" not found"), vm);
-          }
-        }
+    // locate first non-abstract parent
+    var parent = options.parent;
+    if (parent && !options.abstract) {
+      while (parent.$options.abstract && parent.$parent) {
+        parent = parent.$parent;
       }
-      return result
+      parent.$children.push(vm);
     }
-  }
-
-  /*  */
 
-  function normalizeScopedSlots (
-    slots,
-    normalSlots
-  ) {
-    var res;
-    if (!slots) {
-      res = {};
-    } else if (slots._normalized) {
-      return slots
-    } else {
-      res = {};
-      for (var key in slots) {
-        if (slots[key] && key[0] !== '$') {
-          res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-        }
-      }
-    }
-    // expose normal slots on scopedSlots
-    for (var key$1 in normalSlots) {
-      if (!(key$1 in res)) {
-        res[key$1] = proxyNormalSlot(normalSlots, key$1);
-      }
-    }
-    res._normalized = true;
-    res.$stable = slots ? slots.$stable : true;
-    return res
-  }
+    vm.$parent = parent;
+    vm.$root = parent ? parent.$root : vm;
 
-  function normalizeScopedSlot(normalSlots, key, fn) {
-    var normalized = function (scope) {
-      if ( scope === void 0 ) scope = {};
+    vm.$children = [];
+    vm.$refs = {};
 
-      var res = fn(scope);
-      return res && typeof res === 'object' && !Array.isArray(res)
-        ? [res] // single vnode
-        : normalizeChildren(res)
-    };
-    // proxy scoped slots on normal $slots
-    if (!hasOwn(normalSlots, key)) {
-      Object.defineProperty(normalSlots, key, {
-        get: normalized
-      });
-    }
-    return normalized
+    vm._watcher = null;
+    vm._inactive = null;
+    vm._directInactive = false;
+    vm._isMounted = false;
+    vm._isDestroyed = false;
+    vm._isBeingDestroyed = false;
   }
 
-  function proxyNormalSlot(slots, key) {
-    return function () { return slots[key]; }
-  }
+  function lifecycleMixin (Vue) {
+    Vue.prototype._update = function (vnode, hydrating) {
+      var vm = this;
+      var prevEl = vm.$el;
+      var prevVnode = vm._vnode;
+      var restoreActiveInstance = setActiveInstance(vm);
+      vm._vnode = vnode;
+      // Vue.prototype.__patch__ is injected in entry points
+      // based on the rendering backend used.
+      if (!prevVnode) {
+        // initial render
+        vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+      } else {
+        // updates
+        vm.$el = vm.__patch__(prevVnode, vnode);
+      }
+      restoreActiveInstance();
+      // update __vue__ reference
+      if (prevEl) {
+        prevEl.__vue__ = null;
+      }
+      if (vm.$el) {
+        vm.$el.__vue__ = vm;
+      }
+      // if parent is an HOC, update its $el as well
+      if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+        vm.$parent.$el = vm.$el;
+      }
+      // updated hook is called by the scheduler to ensure that children are
+      // updated in a parent's updated hook.
+    };
 
-  /*  */
+    Vue.prototype.$forceUpdate = function () {
+      var vm = this;
+      if (vm._watcher) {
+        vm._watcher.update();
+      }
+    };
 
-  /**
-   * Runtime helper for rendering v-for lists.
-   */
-  function renderList (
-    val,
-    render
-  ) {
-    var ret, i, l, keys, key;
-    if (Array.isArray(val) || typeof val === 'string') {
-      ret = new Array(val.length);
-      for (i = 0, l = val.length; i < l; i++) {
-        ret[i] = render(val[i], i);
+    Vue.prototype.$destroy = function () {
+      var vm = this;
+      if (vm._isBeingDestroyed) {
+        return
       }
-    } else if (typeof val === 'number') {
-      ret = new Array(val);
-      for (i = 0; i < val; i++) {
-        ret[i] = render(i + 1, i);
+      callHook(vm, 'beforeDestroy');
+      vm._isBeingDestroyed = true;
+      // remove self from parent
+      var parent = vm.$parent;
+      if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+        remove(parent.$children, vm);
       }
-    } else if (isObject(val)) {
-      if (hasSymbol && val[Symbol.iterator]) {
-        ret = [];
-        var iterator = val[Symbol.iterator]();
-        var result = iterator.next();
-        while (!result.done) {
-          ret.push(render(result.value, ret.length));
-          result = iterator.next();
-        }
-      } else {
-        keys = Object.keys(val);
-        ret = new Array(keys.length);
-        for (i = 0, l = keys.length; i < l; i++) {
-          key = keys[i];
-          ret[i] = render(val[key], key, i);
-        }
+      // teardown watchers
+      if (vm._watcher) {
+        vm._watcher.teardown();
+      }
+      var i = vm._watchers.length;
+      while (i--) {
+        vm._watchers[i].teardown();
+      }
+      // remove reference from data ob
+      // frozen object may not have observer.
+      if (vm._data.__ob__) {
+        vm._data.__ob__.vmCount--;
+      }
+      // call the last hook...
+      vm._isDestroyed = true;
+      // invoke destroy hooks on current rendered tree
+      vm.__patch__(vm._vnode, null);
+      // fire destroyed hook
+      callHook(vm, 'destroyed');
+      // turn off all instance listeners.
+      vm.$off();
+      // remove __vue__ reference
+      if (vm.$el) {
+        vm.$el.__vue__ = null;
       }
-    }
-    if (!isDef(ret)) {
-      ret = [];
-    }
-    (ret)._isVList = true;
-    return ret
+      // release circular reference (#6759)
+      if (vm.$vnode) {
+        vm.$vnode.parent = null;
+      }
+    };
   }
 
-  /*  */
-
-  /**
-   * Runtime helper for rendering <slot>
-   */
-  function renderSlot (
-    name,
-    fallback,
-    props,
-    bindObject
+  function mountComponent (
+    vm,
+    el,
+    hydrating
   ) {
-    var scopedSlotFn = this.$scopedSlots[name];
-    var nodes;
-    if (scopedSlotFn) { // scoped slot
-      props = props || {};
-      if (bindObject) {
-        if (!isObject(bindObject)) {
+    vm.$el = el;
+    if (!vm.$options.render) {
+      vm.$options.render = createEmptyVNode;
+      {
+        /* istanbul ignore if */
+        if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+          vm.$options.el || el) {
           warn(
-            'slot v-bind without argument expects an Object',
-            this
+            'You are using the runtime-only build of Vue where the template ' +
+            'compiler is not available. Either pre-compile the templates into ' +
+            'render functions, or use the compiler-included build.',
+            vm
+          );
+        } else {
+          warn(
+            'Failed to mount component: template or render function not defined.',
+            vm
           );
         }
-        props = extend(extend({}, bindObject), props);
       }
-      nodes = scopedSlotFn(props) || fallback;
-    } else {
-      nodes = this.$slots[name] || fallback;
     }
+    callHook(vm, 'beforeMount');
 
-    var target = props && props.slot;
-    if (target) {
-      return this.$createElement('template', { slot: target }, nodes)
-    } else {
-      return nodes
-    }
-  }
+    var updateComponent;
+    /* istanbul ignore if */
+    if (config.performance && mark) {
+      updateComponent = function () {
+        var name = vm._name;
+        var id = vm._uid;
+        var startTag = "vue-perf-start:" + id;
+        var endTag = "vue-perf-end:" + id;
 
-  /*  */
+        mark(startTag);
+        var vnode = vm._render();
+        mark(endTag);
+        measure(("vue " + name + " render"), startTag, endTag);
 
-  /**
-   * Runtime helper for resolving filters
-   */
-  function resolveFilter (id) {
-    return resolveAsset(this.$options, 'filters', id, true) || identity
-  }
+        mark(startTag);
+        vm._update(vnode, hydrating);
+        mark(endTag);
+        measure(("vue " + name + " patch"), startTag, endTag);
+      };
+    } else {
+      updateComponent = function () {
+        vm._update(vm._render(), hydrating);
+      };
+    }
 
-  /*  */
+    // we set this to vm._watcher inside the watcher's constructor
+    // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+    // component's mounted hook), which relies on vm._watcher being already defined
+    new Watcher(vm, updateComponent, noop, {
+      before: function before () {
+        if (vm._isMounted && !vm._isDestroyed) {
+          callHook(vm, 'beforeUpdate');
+        }
+      }
+    }, true /* isRenderWatcher */);
+    hydrating = false;
 
-  function isKeyNotMatch (expect, actual) {
-    if (Array.isArray(expect)) {
-      return expect.indexOf(actual) === -1
-    } else {
-      return expect !== actual
+    // manually mounted instance, call mounted on self
+    // mounted is called for render-created child components in its inserted hook
+    if (vm.$vnode == null) {
+      vm._isMounted = true;
+      callHook(vm, 'mounted');
     }
+    return vm
   }
 
-  /**
-   * Runtime helper for checking keyCodes from config.
-   * exposed as Vue.prototype._k
-   * passing in eventKeyName as last argument separately for backwards compat
-   */
-  function checkKeyCodes (
-    eventKeyCode,
-    key,
-    builtInKeyCode,
-    eventKeyName,
-    builtInKeyName
+  function updateChildComponent (
+    vm,
+    propsData,
+    listeners,
+    parentVnode,
+    renderChildren
   ) {
-    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-      return isKeyNotMatch(builtInKeyName, eventKeyName)
-    } else if (mappedKeyCode) {
-      return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-    } else if (eventKeyName) {
-      return hyphenate(eventKeyName) !== key
+    {
+      isUpdatingChildComponent = true;
     }
-  }
-
-  /*  */
 
-  /**
-   * Runtime helper for merging v-bind="object" into a VNode's data.
-   */
-  function bindObjectProps (
-    data,
-    tag,
-    value,
-    asProp,
-    isSync
-  ) {
-    if (value) {
-      if (!isObject(value)) {
-        warn(
-          'v-bind without argument expects an Object or Array value',
-          this
-        );
-      } else {
-        if (Array.isArray(value)) {
-          value = toObject(value);
-        }
-        var hash;
-        var loop = function ( key ) {
-          if (
-            key === 'class' ||
-            key === 'style' ||
-            isReservedAttribute(key)
-          ) {
-            hash = data;
-          } else {
-            var type = data.attrs && data.attrs.type;
-            hash = asProp || config.mustUseProp(tag, type, key)
-              ? data.domProps || (data.domProps = {})
-              : data.attrs || (data.attrs = {});
-          }
-          var camelizedKey = camelize(key);
-          if (!(key in hash) && !(camelizedKey in hash)) {
-            hash[key] = value[key];
+    // determine whether component has slot children
+    // we need to do this before overwriting $options._renderChildren.
 
-            if (isSync) {
-              var on = data.on || (data.on = {});
-              on[("update:" + camelizedKey)] = function ($event) {
-                value[key] = $event;
-              };
-            }
-          }
-        };
+    // check if there are dynamic scopedSlots (hand-written or compiled but with
+    // dynamic slot names). Static scoped slots compiled from template has the
+    // "$stable" marker.
+    var hasDynamicScopedSlot = !!(
+      (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+      (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+    );
 
-        for (var key in value) loop( key );
-      }
-    }
-    return data
-  }
+    // Any static slot children from the parent may have changed during parent's
+    // update. Dynamic scoped slots may also have changed. In such cases, a forced
+    // update is necessary to ensure correctness.
+    var needsForceUpdate = !!(
+      renderChildren ||               // has new static slots
+      vm.$options._renderChildren ||  // has old static slots
+      hasDynamicScopedSlot
+    );
 
-  /*  */
+    vm.$options._parentVnode = parentVnode;
+    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
 
-  /**
-   * Runtime helper for rendering static trees.
-   */
-  function renderStatic (
-    index,
-    isInFor
-  ) {
-    var cached = this._staticTrees || (this._staticTrees = []);
-    var tree = cached[index];
-    // if has already-rendered static tree and not inside v-for,
-    // we can reuse the same tree.
-    if (tree && !isInFor) {
-      return tree
+    if (vm._vnode) { // update child tree's parent
+      vm._vnode.parent = parentVnode;
     }
-    // otherwise, render a fresh tree.
-    tree = cached[index] = this.$options.staticRenderFns[index].call(
-      this._renderProxy,
-      null,
-      this // for render fns generated for functional component templates
-    );
-    markStatic(tree, ("__static__" + index), false);
-    return tree
-  }
+    vm.$options._renderChildren = renderChildren;
 
-  /**
-   * Runtime helper for v-once.
-   * Effectively it means marking the node as static with a unique key.
-   */
-  function markOnce (
-    tree,
-    index,
-    key
-  ) {
-    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-    return tree
-  }
+    // update $attrs and $listeners hash
+    // these are also reactive so they may trigger child update if the child
+    // used them during render
+    vm.$attrs = parentVnode.data.attrs || emptyObject;
+    vm.$listeners = listeners || emptyObject;
 
-  function markStatic (
-    tree,
-    key,
-    isOnce
-  ) {
-    if (Array.isArray(tree)) {
-      for (var i = 0; i < tree.length; i++) {
-        if (tree[i] && typeof tree[i] !== 'string') {
-          markStaticNode(tree[i], (key + "_" + i), isOnce);
-        }
+    // update props
+    if (propsData && vm.$options.props) {
+      toggleObserving(false);
+      var props = vm._props;
+      var propKeys = vm.$options._propKeys || [];
+      for (var i = 0; i < propKeys.length; i++) {
+        var key = propKeys[i];
+        var propOptions = vm.$options.props; // wtf flow?
+        props[key] = validateProp(key, propOptions, propsData, vm);
       }
-    } else {
-      markStaticNode(tree, key, isOnce);
+      toggleObserving(true);
+      // keep a copy of raw propsData
+      vm.$options.propsData = propsData;
     }
-  }
 
-  function markStaticNode (node, key, isOnce) {
-    node.isStatic = true;
-    node.key = key;
-    node.isOnce = isOnce;
+    // update listeners
+    listeners = listeners || emptyObject;
+    var oldListeners = vm.$options._parentListeners;
+    vm.$options._parentListeners = listeners;
+    updateComponentListeners(vm, listeners, oldListeners);
+
+    // resolve slots + force update if has children
+    if (needsForceUpdate) {
+      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+      vm.$forceUpdate();
+    }
+
+    {
+      isUpdatingChildComponent = false;
+    }
   }
 
-  /*  */
+  function isInInactiveTree (vm) {
+    while (vm && (vm = vm.$parent)) {
+      if (vm._inactive) { return true }
+    }
+    return false
+  }
 
-  function bindObjectListeners (data, value) {
-    if (value) {
-      if (!isPlainObject(value)) {
-        warn(
-          'v-on without argument expects an Object value',
-          this
-        );
-      } else {
-        var on = data.on = data.on ? extend({}, data.on) : {};
-        for (var key in value) {
-          var existing = on[key];
-          var ours = value[key];
-          on[key] = existing ? [].concat(existing, ours) : ours;
-        }
+  function activateChildComponent (vm, direct) {
+    if (direct) {
+      vm._directInactive = false;
+      if (isInInactiveTree(vm)) {
+        return
       }
+    } else if (vm._directInactive) {
+      return
+    }
+    if (vm._inactive || vm._inactive === null) {
+      vm._inactive = false;
+      for (var i = 0; i < vm.$children.length; i++) {
+        activateChildComponent(vm.$children[i]);
+      }
+      callHook(vm, 'activated');
     }
-    return data
   }
 
-  /*  */
-
-  function bindDynamicKeys (baseObj, values) {
-    for (var i = 0; i < values.length; i += 2) {
-      var key = values[i];
-      if (typeof key === 'string' && key) {
-        baseObj[values[i]] = values[i + 1];
-      } else if (key !== '' && key !== null) {
-        // null is a speical value for explicitly removing a binding
-        warn(
-          ("Invalid value for dynamic directive argument (expected string or null): " + key),
-          this
-        );
+  function deactivateChildComponent (vm, direct) {
+    if (direct) {
+      vm._directInactive = true;
+      if (isInInactiveTree(vm)) {
+        return
       }
     }
-    return baseObj
+    if (!vm._inactive) {
+      vm._inactive = true;
+      for (var i = 0; i < vm.$children.length; i++) {
+        deactivateChildComponent(vm.$children[i]);
+      }
+      callHook(vm, 'deactivated');
+    }
   }
 
-  // helper to dynamically append modifier runtime markers to event names.
-  // ensure only append when value is already string, otherwise it will be cast
-  // to string and cause the type check to miss.
-  function prependModifier (value, symbol) {
-    return typeof value === 'string' ? symbol + value : value
+  function callHook (vm, hook) {
+    // #7573 disable dep collection when invoking lifecycle hooks
+    pushTarget();
+    var handlers = vm.$options[hook];
+    var info = hook + " hook";
+    if (handlers) {
+      for (var i = 0, j = handlers.length; i < j; i++) {
+        invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+      }
+    }
+    if (vm._hasHookEvent) {
+      vm.$emit('hook:' + hook);
+    }
+    popTarget();
   }
 
   /*  */
 
-  function installRenderHelpers (target) {
-    target._o = markOnce;
-    target._n = toNumber;
-    target._s = toString;
-    target._l = renderList;
-    target._t = renderSlot;
-    target._q = looseEqual;
-    target._i = looseIndexOf;
-    target._m = renderStatic;
-    target._f = resolveFilter;
-    target._k = checkKeyCodes;
-    target._b = bindObjectProps;
-    target._v = createTextVNode;
-    target._e = createEmptyVNode;
-    target._u = resolveScopedSlots;
-    target._g = bindObjectListeners;
-    target._d = bindDynamicKeys;
-    target._p = prependModifier;
-  }
+  var MAX_UPDATE_COUNT = 100;
 
-  /*  */
+  var queue = [];
+  var activatedChildren = [];
+  var has = {};
+  var circular = {};
+  var waiting = false;
+  var flushing = false;
+  var index = 0;
 
-  function FunctionalRenderContext (
-    data,
-    props,
-    children,
-    parent,
-    Ctor
-  ) {
-    var options = Ctor.options;
-    // ensure the createElement function in functional components
-    // gets a unique context - this is necessary for correct named slot check
-    var contextVm;
-    if (hasOwn(parent, '_uid')) {
-      contextVm = Object.create(parent);
-      // $flow-disable-line
-      contextVm._original = parent;
-    } else {
-      // the context vm passed in is a functional context as well.
-      // in this case we want to make sure we are able to get a hold to the
-      // real context instance.
-      contextVm = parent;
-      // $flow-disable-line
-      parent = parent._original;
+  /**
+   * Reset the scheduler's state.
+   */
+  function resetSchedulerState () {
+    index = queue.length = activatedChildren.length = 0;
+    has = {};
+    {
+      circular = {};
     }
-    var isCompiled = isTrue(options._compiled);
-    var needNormalization = !isCompiled;
+    waiting = flushing = false;
+  }
 
-    this.data = data;
-    this.props = props;
-    this.children = children;
-    this.parent = parent;
-    this.listeners = data.on || emptyObject;
-    this.injections = resolveInject(options.inject, parent);
-    this.slots = function () { return resolveSlots(children, parent); };
+  // Async edge case #6566 requires saving the timestamp when event listeners are
+  // attached. However, calling performance.now() has a perf overhead especially
+  // if the page has thousands of event listeners. Instead, we take a timestamp
+  // every time the scheduler flushes and use that for all event listeners
+  // attached during that flush.
+  var currentFlushTimestamp = 0;
 
-    Object.defineProperty(this, 'scopedSlots', ({
-      enumerable: true,
-      get: function get () {
-        return normalizeScopedSlots(data.scopedSlots, this.slots())
-      }
-    }));
+  // Async edge case fix requires storing an event listener's attach timestamp.
+  var getNow = Date.now;
 
-    // support for compiled functional template
-    if (isCompiled) {
-      // exposing $options for renderStatic()
-      this.$options = options;
-      // pre-resolve slots for renderSlot()
-      this.$slots = this.slots();
-      this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
-    }
+  // Determine what event timestamp the browser is using. Annoyingly, the
+  // timestamp can either be hi-res (relative to page load) or low-res
+  // (relative to UNIX epoch), so in order to compare time we have to use the
+  // same timestamp type when saving the flush timestamp.
+  if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+    // if the low-res timestamp which is bigger than the event timestamp
+    // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+    // and we need to use the hi-res version for event listeners as well.
+    getNow = function () { return performance.now(); };
+  }
 
-    if (options._scopeId) {
-      this._c = function (a, b, c, d) {
-        var vnode = createElement(contextVm, a, b, c, d, needNormalization);
-        if (vnode && !Array.isArray(vnode)) {
-          vnode.fnScopeId = options._scopeId;
-          vnode.fnContext = parent;
+  /**
+   * Flush both queues and run the watchers.
+   */
+  function flushSchedulerQueue () {
+    currentFlushTimestamp = getNow();
+    flushing = true;
+    var watcher, id;
+
+    // Sort queue before flush.
+    // This ensures that:
+    // 1. Components are updated from parent to child. (because parent is always
+    //    created before the child)
+    // 2. A component's user watchers are run before its render watcher (because
+    //    user watchers are created before the render watcher)
+    // 3. If a component is destroyed during a parent component's watcher run,
+    //    its watchers can be skipped.
+    queue.sort(function (a, b) { return a.id - b.id; });
+
+    // do not cache length because more watchers might be pushed
+    // as we run existing watchers
+    for (index = 0; index < queue.length; index++) {
+      watcher = queue[index];
+      if (watcher.before) {
+        watcher.before();
+      }
+      id = watcher.id;
+      has[id] = null;
+      watcher.run();
+      // in dev build, check and stop circular updates.
+      if (has[id] != null) {
+        circular[id] = (circular[id] || 0) + 1;
+        if (circular[id] > MAX_UPDATE_COUNT) {
+          warn(
+            'You may have an infinite update loop ' + (
+              watcher.user
+                ? ("in watcher with expression \"" + (watcher.expression) + "\"")
+                : "in a component render function."
+            ),
+            watcher.vm
+          );
+          break
         }
-        return vnode
-      };
-    } else {
-      this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
+      }
     }
-  }
 
-  installRenderHelpers(FunctionalRenderContext.prototype);
+    // keep copies of post queues before resetting state
+    var activatedQueue = activatedChildren.slice();
+    var updatedQueue = queue.slice();
 
-  function createFunctionalComponent (
-    Ctor,
-    propsData,
-    data,
-    contextVm,
-    children
-  ) {
-    var options = Ctor.options;
-    var props = {};
-    var propOptions = options.props;
-    if (isDef(propOptions)) {
-      for (var key in propOptions) {
-        props[key] = validateProp(key, propOptions, propsData || emptyObject);
-      }
-    } else {
-      if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
-      if (isDef(data.props)) { mergeProps(props, data.props); }
-    }
+    resetSchedulerState();
 
-    var renderContext = new FunctionalRenderContext(
-      data,
-      props,
-      children,
-      contextVm,
-      Ctor
-    );
+    // call component updated and activated hooks
+    callActivatedHooks(activatedQueue);
+    callUpdatedHooks(updatedQueue);
 
-    var vnode = options.render.call(null, renderContext._c, renderContext);
+    // devtool hook
+    /* istanbul ignore if */
+    if (devtools && config.devtools) {
+      devtools.emit('flush');
+    }
+  }
 
-    if (vnode instanceof VNode) {
-      return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
-    } else if (Array.isArray(vnode)) {
-      var vnodes = normalizeChildren(vnode) || [];
-      var res = new Array(vnodes.length);
-      for (var i = 0; i < vnodes.length; i++) {
-        res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+  function callUpdatedHooks (queue) {
+    var i = queue.length;
+    while (i--) {
+      var watcher = queue[i];
+      var vm = watcher.vm;
+      if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+        callHook(vm, 'updated');
       }
-      return res
     }
   }
 
-  function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
-    // #7817 clone node before setting fnContext, otherwise if the node is reused
-    // (e.g. it was from a cached normal slot) the fnContext causes named slots
-    // that should not be matched to match.
-    var clone = cloneVNode(vnode);
-    clone.fnContext = contextVm;
-    clone.fnOptions = options;
-    {
-      (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
-    }
-    if (data.slot) {
-      (clone.data || (clone.data = {})).slot = data.slot;
+  /**
+   * Queue a kept-alive component that was activated during patch.
+   * The queue will be processed after the entire tree has been patched.
+   */
+  function queueActivatedComponent (vm) {
+    // setting _inactive to false here so that a render function can
+    // rely on checking whether it's in an inactive tree (e.g. router-view)
+    vm._inactive = false;
+    activatedChildren.push(vm);
+  }
+
+  function callActivatedHooks (queue) {
+    for (var i = 0; i < queue.length; i++) {
+      queue[i]._inactive = true;
+      activateChildComponent(queue[i], true /* true */);
     }
-    return clone
   }
 
-  function mergeProps (to, from) {
-    for (var key in from) {
-      to[camelize(key)] = from[key];
+  /**
+   * Push a watcher into the watcher queue.
+   * Jobs with duplicate IDs will be skipped unless it's
+   * pushed when the queue is being flushed.
+   */
+  function queueWatcher (watcher) {
+    var id = watcher.id;
+    if (has[id] == null) {
+      has[id] = true;
+      if (!flushing) {
+        queue.push(watcher);
+      } else {
+        // if already flushing, splice the watcher based on its id
+        // if already past its id, it will be run next immediately.
+        var i = queue.length - 1;
+        while (i > index && queue[i].id > watcher.id) {
+          i--;
+        }
+        queue.splice(i + 1, 0, watcher);
+      }
+      // queue the flush
+      if (!waiting) {
+        waiting = true;
+
+        if (!config.async) {
+          flushSchedulerQueue();
+          return
+        }
+        nextTick(flushSchedulerQueue);
+      }
     }
   }
 
   /*  */
 
-  /*  */
 
-  /*  */
 
-  /*  */
+  var uid$2 = 0;
 
-  // inline hooks to be invoked on component VNodes during patch
-  var componentVNodeHooks = {
-    init: function init (vnode, hydrating) {
-      if (
-        vnode.componentInstance &&
-        !vnode.componentInstance._isDestroyed &&
-        vnode.data.keepAlive
-      ) {
-        // kept-alive components, treat as a patch
-        var mountedNode = vnode; // work around flow
-        componentVNodeHooks.prepatch(mountedNode, mountedNode);
-      } else {
-        var child = vnode.componentInstance = createComponentInstanceForVnode(
-          vnode,
-          activeInstance
+  /**
+   * A watcher parses an expression, collects dependencies,
+   * and fires callback when the expression value changes.
+   * This is used for both the $watch() api and directives.
+   */
+  var Watcher = function Watcher (
+    vm,
+    expOrFn,
+    cb,
+    options,
+    isRenderWatcher
+  ) {
+    this.vm = vm;
+    if (isRenderWatcher) {
+      vm._watcher = this;
+    }
+    vm._watchers.push(this);
+    // options
+    if (options) {
+      this.deep = !!options.deep;
+      this.user = !!options.user;
+      this.lazy = !!options.lazy;
+      this.sync = !!options.sync;
+      this.before = options.before;
+    } else {
+      this.deep = this.user = this.lazy = this.sync = false;
+    }
+    this.cb = cb;
+    this.id = ++uid$2; // uid for batching
+    this.active = true;
+    this.dirty = this.lazy; // for lazy watchers
+    this.deps = [];
+    this.newDeps = [];
+    this.depIds = new _Set();
+    this.newDepIds = new _Set();
+    this.expression = expOrFn.toString();
+    // parse expression for getter
+    if (typeof expOrFn === 'function') {
+      this.getter = expOrFn;
+    } else {
+      this.getter = parsePath(expOrFn);
+      if (!this.getter) {
+        this.getter = noop;
+        warn(
+          "Failed watching path: \"" + expOrFn + "\" " +
+          'Watcher only accepts simple dot-delimited paths. ' +
+          'For full control, use a function instead.',
+          vm
         );
-        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
       }
-    },
-
-    prepatch: function prepatch (oldVnode, vnode) {
-      var options = vnode.componentOptions;
-      var child = vnode.componentInstance = oldVnode.componentInstance;
-      updateChildComponent(
-        child,
-        options.propsData, // updated props
-        options.listeners, // updated listeners
-        vnode, // new parent vnode
-        options.children // new children
-      );
-    },
+    }
+    this.value = this.lazy
+      ? undefined
+      : this.get();
+  };
 
-    insert: function insert (vnode) {
-      var context = vnode.context;
-      var componentInstance = vnode.componentInstance;
-      if (!componentInstance._isMounted) {
-        componentInstance._isMounted = true;
-        callHook(componentInstance, 'mounted');
-      }
-      if (vnode.data.keepAlive) {
-        if (context._isMounted) {
-          // vue-router#1212
-          // During updates, a kept-alive component's child components may
-          // change, so directly walking the tree here may call activated hooks
-          // on incorrect children. Instead we push them into a queue which will
-          // be processed after the whole patch process ended.
-          queueActivatedComponent(componentInstance);
-        } else {
-          activateChildComponent(componentInstance, true /* direct */);
-        }
+  /**
+   * Evaluate the getter, and re-collect dependencies.
+   */
+  Watcher.prototype.get = function get () {
+    pushTarget(this);
+    var value;
+    var vm = this.vm;
+    try {
+      value = this.getter.call(vm, vm);
+    } catch (e) {
+      if (this.user) {
+        handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+      } else {
+        throw e
       }
-    },
-
-    destroy: function destroy (vnode) {
-      var componentInstance = vnode.componentInstance;
-      if (!componentInstance._isDestroyed) {
-        if (!vnode.data.keepAlive) {
-          componentInstance.$destroy();
-        } else {
-          deactivateChildComponent(componentInstance, true /* direct */);
-        }
+    } finally {
+      // "touch" every property so they are all tracked as
+      // dependencies for deep watching
+      if (this.deep) {
+        traverse(value);
       }
+      popTarget();
+      this.cleanupDeps();
     }
+    return value
   };
 
-  var hooksToMerge = Object.keys(componentVNodeHooks);
-
-  function createComponent (
-    Ctor,
-    data,
-    context,
-    children,
-    tag
-  ) {
-    if (isUndef(Ctor)) {
-      return
-    }
-
-    var baseCtor = context.$options._base;
-
-    // plain options object: turn it into a constructor
-    if (isObject(Ctor)) {
-      Ctor = baseCtor.extend(Ctor);
-    }
-
-    // if at this stage it's not a constructor or an async component factory,
-    // reject.
-    if (typeof Ctor !== 'function') {
-      {
-        warn(("Invalid Component definition: " + (String(Ctor))), context);
+  /**
+   * Add a dependency to this directive.
+   */
+  Watcher.prototype.addDep = function addDep (dep) {
+    var id = dep.id;
+    if (!this.newDepIds.has(id)) {
+      this.newDepIds.add(id);
+      this.newDeps.push(dep);
+      if (!this.depIds.has(id)) {
+        dep.addSub(this);
       }
-      return
     }
+  };
 
-    // async component
-    var asyncFactory;
-    if (isUndef(Ctor.cid)) {
-      asyncFactory = Ctor;
-      Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
-      if (Ctor === undefined) {
-        // return a placeholder node for async component, which is rendered
-        // as a comment node but preserves all the raw information for the node.
-        // the information will be used for async server-rendering and hydration.
-        return createAsyncPlaceholder(
-          asyncFactory,
-          data,
-          context,
-          children,
-          tag
-        )
+  /**
+   * Clean up for dependency collection.
+   */
+  Watcher.prototype.cleanupDeps = function cleanupDeps () {
+    var i = this.deps.length;
+    while (i--) {
+      var dep = this.deps[i];
+      if (!this.newDepIds.has(dep.id)) {
+        dep.removeSub(this);
       }
     }
+    var tmp = this.depIds;
+    this.depIds = this.newDepIds;
+    this.newDepIds = tmp;
+    this.newDepIds.clear();
+    tmp = this.deps;
+    this.deps = this.newDeps;
+    this.newDeps = tmp;
+    this.newDeps.length = 0;
+  };
 
-    data = data || {};
-
-    // resolve constructor options in case global mixins are applied after
-    // component constructor creation
-    resolveConstructorOptions(Ctor);
-
-    // transform component v-model data into props & events
-    if (isDef(data.model)) {
-      transformModel(Ctor.options, data);
-    }
-
-    // extract props
-    var propsData = extractPropsFromVNodeData(data, Ctor, tag);
-
-    // functional component
-    if (isTrue(Ctor.options.functional)) {
-      return createFunctionalComponent(Ctor, propsData, data, context, children)
+  /**
+   * Subscriber interface.
+   * Will be called when a dependency changes.
+   */
+  Watcher.prototype.update = function update () {
+    /* istanbul ignore else */
+    if (this.lazy) {
+      this.dirty = true;
+    } else if (this.sync) {
+      this.run();
+    } else {
+      queueWatcher(this);
     }
+  };
 
-    // extract listeners, since these needs to be treated as
-    // child component listeners instead of DOM listeners
-    var listeners = data.on;
-    // replace with listeners with .native modifier
-    // so it gets processed during parent component patch.
-    data.on = data.nativeOn;
-
-    if (isTrue(Ctor.options.abstract)) {
-      // abstract components do not keep anything
-      // other than props & listeners & slot
-
-      // work around flow
-      var slot = data.slot;
-      data = {};
-      if (slot) {
-        data.slot = slot;
+  /**
+   * Scheduler job interface.
+   * Will be called by the scheduler.
+   */
+  Watcher.prototype.run = function run () {
+    if (this.active) {
+      var value = this.get();
+      if (
+        value !== this.value ||
+        // Deep watchers and watchers on Object/Arrays should fire even
+        // when the value is the same, because the value may
+        // have mutated.
+        isObject(value) ||
+        this.deep
+      ) {
+        // set new value
+        var oldValue = this.value;
+        this.value = value;
+        if (this.user) {
+          try {
+            this.cb.call(this.vm, value, oldValue);
+          } catch (e) {
+            handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
+          }
+        } else {
+          this.cb.call(this.vm, value, oldValue);
+        }
       }
     }
+  };
 
-    // install component management hooks onto the placeholder node
-    installComponentHooks(data);
-
-    // return a placeholder vnode
-    var name = Ctor.options.name || tag;
-    var vnode = new VNode(
-      ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
-      data, undefined, undefined, undefined, context,
-      { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
-      asyncFactory
-    );
-
-    return vnode
-  }
-
-  function createComponentInstanceForVnode (
-    vnode, // we know it's MountedComponentVNode but flow doesn't
-    parent // activeInstance in lifecycle state
-  ) {
-    var options = {
-      _isComponent: true,
-      _parentVnode: vnode,
-      parent: parent
-    };
-    // check inline-template render functions
-    var inlineTemplate = vnode.data.inlineTemplate;
-    if (isDef(inlineTemplate)) {
-      options.render = inlineTemplate.render;
-      options.staticRenderFns = inlineTemplate.staticRenderFns;
-    }
-    return new vnode.componentOptions.Ctor(options)
-  }
+  /**
+   * Evaluate the value of the watcher.
+   * This only gets called for lazy watchers.
+   */
+  Watcher.prototype.evaluate = function evaluate () {
+    this.value = this.get();
+    this.dirty = false;
+  };
 
-  function installComponentHooks (data) {
-    var hooks = data.hook || (data.hook = {});
-    for (var i = 0; i < hooksToMerge.length; i++) {
-      var key = hooksToMerge[i];
-      var existing = hooks[key];
-      var toMerge = componentVNodeHooks[key];
-      if (existing !== toMerge && !(existing && existing._merged)) {
-        hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
-      }
+  /**
+   * Depend on all deps collected by this watcher.
+   */
+  Watcher.prototype.depend = function depend () {
+    var i = this.deps.length;
+    while (i--) {
+      this.deps[i].depend();
     }
-  }
-
-  function mergeHook$1 (f1, f2) {
-    var merged = function (a, b) {
-      // flow complains about extra args which is why we use any
-      f1(a, b);
-      f2(a, b);
-    };
-    merged._merged = true;
-    return merged
-  }
+  };
 
-  // transform component v-model info (value and callback) into
-  // prop and event handler respectively.
-  function transformModel (options, data) {
-    var prop = (options.model && options.model.prop) || 'value';
-    var event = (options.model && options.model.event) || 'input'
-    ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
-    var on = data.on || (data.on = {});
-    var existing = on[event];
-    var callback = data.model.callback;
-    if (isDef(existing)) {
-      if (
-        Array.isArray(existing)
-          ? existing.indexOf(callback) === -1
-          : existing !== callback
-      ) {
-        on[event] = [callback].concat(existing);
+  /**
+   * Remove self from all dependencies' subscriber list.
+   */
+  Watcher.prototype.teardown = function teardown () {
+    if (this.active) {
+      // remove self from vm's watcher list
+      // this is a somewhat expensive operation so we skip it
+      // if the vm is being destroyed.
+      if (!this.vm._isBeingDestroyed) {
+        remove(this.vm._watchers, this);
       }
-    } else {
-      on[event] = callback;
+      var i = this.deps.length;
+      while (i--) {
+        this.deps[i].removeSub(this);
+      }
+      this.active = false;
     }
-  }
+  };
 
   /*  */
 
-  var SIMPLE_NORMALIZE = 1;
-  var ALWAYS_NORMALIZE = 2;
+  var sharedPropertyDefinition = {
+    enumerable: true,
+    configurable: true,
+    get: noop,
+    set: noop
+  };
 
-  // wrapper function for providing a more flexible interface
-  // without getting yelled at by flow
-  function createElement (
-    context,
-    tag,
-    data,
-    children,
-    normalizationType,
-    alwaysNormalize
-  ) {
-    if (Array.isArray(data) || isPrimitive(data)) {
-      normalizationType = children;
-      children = data;
-      data = undefined;
+  function proxy (target, sourceKey, key) {
+    sharedPropertyDefinition.get = function proxyGetter () {
+      return this[sourceKey][key]
+    };
+    sharedPropertyDefinition.set = function proxySetter (val) {
+      this[sourceKey][key] = val;
+    };
+    Object.defineProperty(target, key, sharedPropertyDefinition);
+  }
+
+  function initState (vm) {
+    vm._watchers = [];
+    var opts = vm.$options;
+    if (opts.props) { initProps(vm, opts.props); }
+    if (opts.methods) { initMethods(vm, opts.methods); }
+    if (opts.data) {
+      initData(vm);
+    } else {
+      observe(vm._data = {}, true /* asRootData */);
     }
-    if (isTrue(alwaysNormalize)) {
-      normalizationType = ALWAYS_NORMALIZE;
+    if (opts.computed) { initComputed(vm, opts.computed); }
+    if (opts.watch && opts.watch !== nativeWatch) {
+      initWatch(vm, opts.watch);
     }
-    return _createElement(context, tag, data, children, normalizationType)
   }
 
-  function _createElement (
-    context,
-    tag,
-    data,
-    children,
-    normalizationType
-  ) {
-    if (isDef(data) && isDef((data).__ob__)) {
+  function initProps (vm, propsOptions) {
+    var propsData = vm.$options.propsData || {};
+    var props = vm._props = {};
+    // cache prop keys so that future props updates can iterate using Array
+    // instead of dynamic object key enumeration.
+    var keys = vm.$options._propKeys = [];
+    var isRoot = !vm.$parent;
+    // root instance props should be converted
+    if (!isRoot) {
+      toggleObserving(false);
+    }
+    var loop = function ( key ) {
+      keys.push(key);
+      var value = validateProp(key, propsOptions, propsData, vm);
+      /* istanbul ignore else */
+      {
+        var hyphenatedKey = hyphenate(key);
+        if (isReservedAttribute(hyphenatedKey) ||
+            config.isReservedAttr(hyphenatedKey)) {
+          warn(
+            ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
+            vm
+          );
+        }
+        defineReactive$$1(props, key, value, function () {
+          if (!isRoot && !isUpdatingChildComponent) {
+            warn(
+              "Avoid mutating a prop directly since the value will be " +
+              "overwritten whenever the parent component re-renders. " +
+              "Instead, use a data or computed property based on the prop's " +
+              "value. Prop being mutated: \"" + key + "\"",
+              vm
+            );
+          }
+        });
+      }
+      // static props are already proxied on the component's prototype
+      // during Vue.extend(). We only need to proxy props defined at
+      // instantiation here.
+      if (!(key in vm)) {
+        proxy(vm, "_props", key);
+      }
+    };
+
+    for (var key in propsOptions) loop( key );
+    toggleObserving(true);
+  }
+
+  function initData (vm) {
+    var data = vm.$options.data;
+    data = vm._data = typeof data === 'function'
+      ? getData(data, vm)
+      : data || {};
+    if (!isPlainObject(data)) {
+      data = {};
       warn(
-        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-        'Always create fresh vnode data objects in each render!',
-        context
+        'data functions should return an object:\n' +
+        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+        vm
       );
-      return createEmptyVNode()
-    }
-    // object syntax in v-bind
-    if (isDef(data) && isDef(data.is)) {
-      tag = data.is;
-    }
-    if (!tag) {
-      // in case of component :is set to falsy value
-      return createEmptyVNode()
     }
-    // warn against non-primitive key
-    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-    ) {
+    // proxy data on instance
+    var keys = Object.keys(data);
+    var props = vm.$options.props;
+    var methods = vm.$options.methods;
+    var i = keys.length;
+    while (i--) {
+      var key = keys[i];
       {
+        if (methods && hasOwn(methods, key)) {
+          warn(
+            ("Method \"" + key + "\" has already been defined as a data property."),
+            vm
+          );
+        }
+      }
+      if (props && hasOwn(props, key)) {
         warn(
-          'Avoid using non-primitive value as key, ' +
-          'use string/number value instead.',
-          context
+          "The data property \"" + key + "\" is already declared as a prop. " +
+          "Use prop default value instead.",
+          vm
         );
+      } else if (!isReserved(key)) {
+        proxy(vm, "_data", key);
       }
     }
-    // support single function children as default scoped slot
-    if (Array.isArray(children) &&
-      typeof children[0] === 'function'
-    ) {
-      data = data || {};
-      data.scopedSlots = { default: children[0] };
-      children.length = 0;
-    }
-    if (normalizationType === ALWAYS_NORMALIZE) {
-      children = normalizeChildren(children);
-    } else if (normalizationType === SIMPLE_NORMALIZE) {
-      children = simpleNormalizeChildren(children);
+    // observe data
+    observe(data, true /* asRootData */);
+  }
+
+  function getData (data, vm) {
+    // #7573 disable dep collection when invoking data getters
+    pushTarget();
+    try {
+      return data.call(vm, vm)
+    } catch (e) {
+      handleError(e, vm, "data()");
+      return {}
+    } finally {
+      popTarget();
     }
-    var vnode, ns;
-    if (typeof tag === 'string') {
-      var Ctor;
-      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-      if (config.isReservedTag(tag)) {
-        // platform built-in elements
-        vnode = new VNode(
-          config.parsePlatformTagName(tag), data, children,
-          undefined, undefined, context
+  }
+
+  var computedWatcherOptions = { lazy: true };
+
+  function initComputed (vm, computed) {
+    // $flow-disable-line
+    var watchers = vm._computedWatchers = Object.create(null);
+    // computed properties are just getters during SSR
+    var isSSR = isServerRendering();
+
+    for (var key in computed) {
+      var userDef = computed[key];
+      var getter = typeof userDef === 'function' ? userDef : userDef.get;
+      if (getter == null) {
+        warn(
+          ("Getter is missing for computed property \"" + key + "\"."),
+          vm
         );
-      } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-        // component
-        vnode = createComponent(Ctor, data, context, children, tag);
-      } else {
-        // unknown or unlisted namespaced elements
-        // check at runtime because it may get assigned a namespace when its
-        // parent normalizes children
-        vnode = new VNode(
-          tag, data, children,
-          undefined, undefined, context
+      }
+
+      if (!isSSR) {
+        // create internal watcher for the computed property.
+        watchers[key] = new Watcher(
+          vm,
+          getter || noop,
+          noop,
+          computedWatcherOptions
         );
       }
+
+      // component-defined computed properties are already defined on the
+      // component prototype. We only need to define computed properties defined
+      // at instantiation here.
+      if (!(key in vm)) {
+        defineComputed(vm, key, userDef);
+      } else {
+        if (key in vm.$data) {
+          warn(("The computed property \"" + key + "\" is already defined in data."), vm);
+        } else if (vm.$options.props && key in vm.$options.props) {
+          warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+        }
+      }
+    }
+  }
+
+  function defineComputed (
+    target,
+    key,
+    userDef
+  ) {
+    var shouldCache = !isServerRendering();
+    if (typeof userDef === 'function') {
+      sharedPropertyDefinition.get = shouldCache
+        ? createComputedGetter(key)
+        : createGetterInvoker(userDef);
+      sharedPropertyDefinition.set = noop;
     } else {
-      // direct component options / constructor
-      vnode = createComponent(tag, data, context, children);
+      sharedPropertyDefinition.get = userDef.get
+        ? shouldCache && userDef.cache !== false
+          ? createComputedGetter(key)
+          : createGetterInvoker(userDef.get)
+        : noop;
+      sharedPropertyDefinition.set = userDef.set || noop;
     }
-    if (Array.isArray(vnode)) {
-      return vnode
-    } else if (isDef(vnode)) {
-      if (isDef(ns)) { applyNS(vnode, ns); }
-      if (isDef(data)) { registerDeepBindings(data); }
-      return vnode
-    } else {
-      return createEmptyVNode()
+    if (sharedPropertyDefinition.set === noop) {
+      sharedPropertyDefinition.set = function () {
+        warn(
+          ("Computed property \"" + key + "\" was assigned to but it has no setter."),
+          this
+        );
+      };
     }
+    Object.defineProperty(target, key, sharedPropertyDefinition);
   }
 
-  function applyNS (vnode, ns, force) {
-    vnode.ns = ns;
-    if (vnode.tag === 'foreignObject') {
-      // use default namespace inside foreignObject
-      ns = undefined;
-      force = true;
-    }
-    if (isDef(vnode.children)) {
-      for (var i = 0, l = vnode.children.length; i < l; i++) {
-        var child = vnode.children[i];
-        if (isDef(child.tag) && (
-          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-          applyNS(child, ns, force);
+  function createComputedGetter (key) {
+    return function computedGetter () {
+      var watcher = this._computedWatchers && this._computedWatchers[key];
+      if (watcher) {
+        if (watcher.dirty) {
+          watcher.evaluate();
         }
+        if (Dep.target) {
+          watcher.depend();
+        }
+        return watcher.value
       }
     }
   }
 
-  // ref #5318
-  // necessary to ensure parent re-render when deep bindings like :style and
-  // :class are used on slot nodes
-  function registerDeepBindings (data) {
-    if (isObject(data.style)) {
-      traverse(data.style);
-    }
-    if (isObject(data.class)) {
-      traverse(data.class);
+  function createGetterInvoker(fn) {
+    return function computedGetter () {
+      return fn.call(this, this)
     }
   }
 
-  /*  */
-
-  function initRender (vm) {
-    vm._vnode = null; // the root of the child tree
-    vm._staticTrees = null; // v-once cached trees
-    var options = vm.$options;
-    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
-    var renderContext = parentVnode && parentVnode.context;
-    vm.$slots = resolveSlots(options._renderChildren, renderContext);
-    vm.$scopedSlots = emptyObject;
-    // bind the createElement fn to this instance
-    // so that we get proper render context inside it.
-    // args order: tag, data, children, normalizationType, alwaysNormalize
-    // internal version is used by render functions compiled from templates
-    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
-    // normalization is always applied for the public version, used in
-    // user-written render functions.
-    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+  function initMethods (vm, methods) {
+    var props = vm.$options.props;
+    for (var key in methods) {
+      {
+        if (typeof methods[key] !== 'function') {
+          warn(
+            "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
+            "Did you reference the function correctly?",
+            vm
+          );
+        }
+        if (props && hasOwn(props, key)) {
+          warn(
+            ("Method \"" + key + "\" has already been defined as a prop."),
+            vm
+          );
+        }
+        if ((key in vm) && isReserved(key)) {
+          warn(
+            "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
+            "Avoid defining component methods that start with _ or $."
+          );
+        }
+      }
+      vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+    }
+  }
 
-    // $attrs & $listeners are exposed for easier HOC creation.
-    // they need to be reactive so that HOCs using them are always updated
-    var parentData = parentVnode && parentVnode.data;
+  function initWatch (vm, watch) {
+    for (var key in watch) {
+      var handler = watch[key];
+      if (Array.isArray(handler)) {
+        for (var i = 0; i < handler.length; i++) {
+          createWatcher(vm, key, handler[i]);
+        }
+      } else {
+        createWatcher(vm, key, handler);
+      }
+    }
+  }
 
-    /* istanbul ignore else */
-    {
-      defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
-        !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
-      }, true);
-      defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
-        !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
-      }, true);
+  function createWatcher (
+    vm,
+    expOrFn,
+    handler,
+    options
+  ) {
+    if (isPlainObject(handler)) {
+      options = handler;
+      handler = handler.handler;
+    }
+    if (typeof handler === 'string') {
+      handler = vm[handler];
     }
+    return vm.$watch(expOrFn, handler, options)
   }
 
-  function renderMixin (Vue) {
-    // install runtime convenience helpers
-    installRenderHelpers(Vue.prototype);
+  function stateMixin (Vue) {
+    // flow somehow has problems with directly declared definition object
+    // when using Object.defineProperty, so we have to procedurally build up
+    // the object here.
+    var dataDef = {};
+    dataDef.get = function () { return this._data };
+    var propsDef = {};
+    propsDef.get = function () { return this._props };
+    {
+      dataDef.set = function () {
+        warn(
+          'Avoid replacing instance root $data. ' +
+          'Use nested data properties instead.',
+          this
+        );
+      };
+      propsDef.set = function () {
+        warn("$props is readonly.", this);
+      };
+    }
+    Object.defineProperty(Vue.prototype, '$data', dataDef);
+    Object.defineProperty(Vue.prototype, '$props', propsDef);
 
-    Vue.prototype.$nextTick = function (fn) {
-      return nextTick(fn, this)
-    };
+    Vue.prototype.$set = set;
+    Vue.prototype.$delete = del;
 
-    Vue.prototype._render = function () {
+    Vue.prototype.$watch = function (
+      expOrFn,
+      cb,
+      options
+    ) {
       var vm = this;
-      var ref = vm.$options;
-      var render = ref.render;
-      var _parentVnode = ref._parentVnode;
-
-      if (_parentVnode) {
-        vm.$scopedSlots = normalizeScopedSlots(
-          _parentVnode.data.scopedSlots,
-          vm.$slots
-        );
+      if (isPlainObject(cb)) {
+        return createWatcher(vm, expOrFn, cb, options)
       }
-
-      // set parent vnode. this allows render functions to have access
-      // to the data on the placeholder node.
-      vm.$vnode = _parentVnode;
-      // render self
-      var vnode;
-      try {
-        vnode = render.call(vm._renderProxy, vm.$createElement);
-      } catch (e) {
-        handleError(e, vm, "render");
-        // return error render result,
-        // or previous vnode to prevent render error causing blank component
-        /* istanbul ignore else */
-        if (vm.$options.renderError) {
-          try {
-            vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
-          } catch (e) {
-            handleError(e, vm, "renderError");
-            vnode = vm._vnode;
-          }
-        } else {
-          vnode = vm._vnode;
+      options = options || {};
+      options.user = true;
+      var watcher = new Watcher(vm, expOrFn, cb, options);
+      if (options.immediate) {
+        try {
+          cb.call(vm, watcher.value);
+        } catch (error) {
+          handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
         }
       }
-      // if the returned array contains only a single node, allow it
-      if (Array.isArray(vnode) && vnode.length === 1) {
-        vnode = vnode[0];
-      }
-      // return empty vnode in case the render function errored out
-      if (!(vnode instanceof VNode)) {
-        if (Array.isArray(vnode)) {
-          warn(
-            'Multiple root nodes returned from render function. Render function ' +
-            'should return a single root node.',
-            vm
-          );
-        }
-        vnode = createEmptyVNode();
+      return function unwatchFn () {
+        watcher.teardown();
       }
-      // set parent
-      vnode.parent = _parentVnode;
-      return vnode
     };
   }
 
@@ -5332,7 +5335,7 @@
     value: FunctionalRenderContext
   });
 
-  Vue.version = '2.6.2';
+  Vue.version = '2.6.3';
 
   /*  */
 
@@ -7396,6 +7399,11 @@
     }
   }
 
+  // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+  // implementation and does not fire microtasks in between event propagation, so
+  // safe to exclude.
+  var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
   function add$1 (
     name,
     handler,
@@ -7408,11 +7416,16 @@
     // the solution is simple: we save the timestamp when a handler is attached,
     // and the handler would only fire if the event passed to it was fired
     // AFTER it was attached.
-    if (isUsingMicroTask) {
+    if (useMicrotaskFix) {
       var attachedTimestamp = currentFlushTimestamp;
       var original = handler;
       handler = original._wrapper = function (e) {
-        if (e.timeStamp >= attachedTimestamp) {
+        if (
+          e.timeStamp >= attachedTimestamp ||
+          // #9448 bail if event is fired in another document in a multi-page
+          // electron/nw.js app
+          e.target.ownerDocument !== document
+        ) {
           return original.apply(this, arguments)
         }
       };
@@ -9424,6 +9437,8 @@
 
   var decodeHTMLCached = cached(he.decode);
 
+  var emptySlotScopeToken = "_empty_";
+
   // configurable state
   var warn$2;
   var delimiters;
@@ -10036,7 +10051,7 @@
           var dynamic = ref.dynamic;
           el.slotTarget = name;
           el.slotTargetDynamic = dynamic;
-          el.slotScope = slotBinding.value || "_"; // force it into a scoped slot for perf
+          el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
         }
       } else {
         // v-slot on component, denotes default slot
@@ -10071,8 +10086,13 @@
           var slotContainer = slots[name$1] = createASTElement('template', [], el);
           slotContainer.slotTarget = name$1;
           slotContainer.slotTargetDynamic = dynamic$1;
-          slotContainer.children = el.children.filter(function (c) { return !(c).slotScope; });
-          slotContainer.slotScope = slotBinding$1.value || "_";
+          slotContainer.children = el.children.filter(function (c) {
+            if (!c.slotScope) {
+              c.parent = slotContainer;
+              return true
+            }
+          });
+          slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
           // remove children as they are returned from scopedSlots now
           el.children = [];
           // mark el non-plain so data gets generated
@@ -11001,7 +11021,7 @@
     }
     // scoped slots
     if (el.scopedSlots) {
-      data += (genScopedSlots(el.scopedSlots, state)) + ",";
+      data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
     }
     // component v-model
     if (el.model) {
@@ -11072,16 +11092,34 @@
   }
 
   function genScopedSlots (
+    el,
     slots,
     state
   ) {
-    var hasDynamicKeys = Object.keys(slots).some(function (key) {
+    // by default scoped slots are considered "stable", this allows child
+    // components with only scoped slots to skip forced updates from parent.
+    // but in some cases we have to bail-out of this optimization
+    // for example if the slot contains dynamic names, has v-if or v-for on them...
+    var needsForceUpdate = Object.keys(slots).some(function (key) {
       var slot = slots[key];
       return slot.slotTargetDynamic || slot.if || slot.for
     });
+    // OR when it is inside another scoped slot (the reactivity is disconnected)
+    // #9438
+    if (!needsForceUpdate) {
+      var parent = el.parent;
+      while (parent) {
+        if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+          needsForceUpdate = true;
+          break
+        }
+        parent = parent.parent;
+      }
+    }
+
     return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
         return genScopedSlot(slots[key], state)
-      }).join(',')) + "]" + (hasDynamicKeys ? ",true" : "") + ")")
+      }).join(',')) + "]" + (needsForceUpdate ? ",true" : "") + ")")
   }
 
   function genScopedSlot (
@@ -11095,7 +11133,10 @@
     if (el.for && !el.forProcessed) {
       return genFor(el, state, genScopedSlot)
     }
-    var fn = "function(" + (String(el.slotScope)) + "){" +
+    var slotScope = el.slotScope === emptySlotScopeToken
+      ? ""
+      : String(el.slotScope);
+    var fn = "function(" + slotScope + "){" +
       "return " + (el.tag === 'template'
         ? el.if && isLegacySyntax
           ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
@@ -11188,7 +11229,14 @@
     var slotName = el.slotName || '"default"';
     var children = genChildren(el, state);
     var res = "_t(" + slotName + (children ? ("," + children) : '');
-    var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
+    var attrs = el.attrs || el.dynamicAttrs
+      ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+          // slot props are camelized
+          name: camelize(attr.name),
+          value: attr.value,
+          dynamic: attr.dynamic
+        }); }))
+      : null;
     var bind$$1 = el.attrsMap['v-bind'];
     if ((attrs || bind$$1) && !children) {
       res += ",null";
diff --git a/dist/vue.min.js b/dist/vue.min.js
index a2a499e7cff..f89cdad0e30 100644
--- a/dist/vue.min.js
+++ b/dist/vue.min.js
@@ -1,6 +1,6 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).Vue=t()}(this,function(){"use strict";var e=Object.freeze({});function t(e){return null==e}function n(e){return null!=e}function r(e){return!0===e}function i(e){return"string"==typeof e||"number"==typeof e||"symbol"==typeof e||"boolean"==typeof e}function o(e){return null!==e&&"object"==typeof e}var a=Object.prototype.toString;function s(e){return"[object Object]"===a.call(e)}function c(e){var t=parseFloat(String(e));return t>=0&&Math.floor(t)===t&&isFinite(e)}function u(e){return n(e)&&"function"==typeof e.then&&"function"==typeof e.catch}function l(e){return null==e?"":Array.isArray(e)||s(e)&&e.toString===a?JSON.stringify(e,null,2):String(e)}function f(e){var t=parseFloat(e);return isNaN(t)?e:t}function p(e,t){for(var n=Object.create(null),r=e.split(","),i=0;i<r.length;i++)n[r[i]]=!0;return t?function(e){return 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xa=/^([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/,Aa=/\([^)]*?\);*$/,ka=/^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/,Oa={esc:27,tab:9,enter:13,space:32,up:38,left:37,right:39,down:40,delete:[8,46]},Sa={esc:["Esc","Escape"],tab:"Tab",enter:"Enter",space:[" ","Spacebar"],up:["Up","ArrowUp"],left:["Left","ArrowLeft"],right:["Right","ArrowRight"],down:["Down","ArrowDown"],delete:["Backspace","Delete","Del"]},Ta=function(e){return"if("+e+")return null;"},Ea={stop:"$event.stopPropagation();",prevent:"$event.preventDefault();",self:Ta("$event.target !== $event.currentTarget"),ctrl:Ta("!$event.ctrlKey"),shift:Ta("!$event.shiftKey"),alt:Ta("!$event.altKey"),meta:Ta("!$event.metaKey"),left:Ta("'button' in $event && $event.button !== 0"),middle:Ta("'button' in $event && $event.button !== 1"),right:Ta("'button' in $event && $event.button !== 2")};function Na(e,t){var n=t?"nativeOn:":"on:",r="",i="";for(var o in e){var a=ja(e[o]);e[o]&&e[o].dynamic?i+=o+","+a+",":r+='"'+o+'":'+a+","}return r="{"+r.slice(0,-1)+"}",i?n+"_d("+r+",["+i.slice(0,-1)+"])":n+r}function ja(e){if(!e)return"function(){}";if(Array.isArray(e))return"["+e.map(function(e){return ja(e)}).join(",")+"]";var t=ka.test(e.value),n=xa.test(e.value),r=ka.test(e.value.replace(Aa,""));if(e.modifiers){var i="",o="",a=[];for(var s in e.modifiers)if(Ea[s])o+=Ea[s],Oa[s]&&a.push(s);else if("exact"===s){var c=e.modifiers;o+=Ta(["ctrl","shift","alt","meta"].filter(function(e){return!c[e]}).map(function(e){return"$event."+e+"Key"}).join("||"))}else a.push(s);return a.length&&(i+=function(e){return"if(('keyCode' in $event)&&"+e.map(La).join("&&")+")return null;"}(a)),o&&(i+=o),"function($event){"+i+(t?"return "+e.value+"($event)":n?"return ("+e.value+")($event)":r?"return "+e.value:e.value)+"}"}return t||n?e.value:"function($event){"+(r?"return "+e.value:e.value)+"}"}function La(e){var t=parseInt(e,10);if(t)return"$event.keyCode!=="+t;var 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u=t.directives[o.name];u&&(a=!!u(e,o,t.warn)),a&&(c=!0,s+='{name:"'+o.name+'",rawName:"'+o.rawName+'"'+(o.value?",value:("+o.value+"),expression:"+JSON.stringify(o.value):"")+(o.arg?",arg:"+(o.isDynamicArg?o.arg:'"'+o.arg+'"'):"")+(o.modifiers?",modifiers:"+JSON.stringify(o.modifiers):"")+"},")}if(c)return s.slice(0,-1)+"]"}(e,t);r&&(n+=r+","),e.key&&(n+="key:"+e.key+","),e.ref&&(n+="ref:"+e.ref+","),e.refInFor&&(n+="refInFor:true,"),e.pre&&(n+="pre:true,"),e.component&&(n+='tag:"'+e.tag+'",');for(var i=0;i<t.dataGenFns.length;i++)n+=t.dataGenFns[i](e);if(e.attrs&&(n+="attrs:"+qa(e.attrs)+","),e.props&&(n+="domProps:"+qa(e.props)+","),e.events&&(n+=Na(e.events,!1)+","),e.nativeEvents&&(n+=Na(e.nativeEvents,!0)+","),e.slotTarget&&!e.slotScope&&(n+="slot:"+e.slotTarget+","),e.scopedSlots&&(n+=function(e,t,n){var r=Object.keys(t).some(function(e){var n=t[e];return n.slotTargetDynamic||n.if||n.for});if(!r)for(var 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"+("template"===e.tag?e.if&&n?"("+e.if+")?"+(Va(e,t)||"undefined")+":undefined":Va(e,t)||"undefined":Pa(e,t))+"}";return"{key:"+(e.slotTarget||'"default"')+",fn:"+r+"}"}function Va(e,t,n,r,i){var o=e.children;if(o.length){var a=o[0];if(1===o.length&&a.for&&"template"!==a.tag&&"slot"!==a.tag){var s=n?t.maybeComponent(a)?",1":",0":"";return""+(r||Pa)(a,t)+s}var c=n?function(e,t){for(var n=0,r=0;r<e.length;r++){var i=e[r];if(1===i.type){if(Ka(i)||i.ifConditions&&i.ifConditions.some(function(e){return Ka(e.block)})){n=2;break}(t(i)||i.ifConditions&&i.ifConditions.some(function(e){return t(e.block)}))&&(n=1)}}return n}(o,t.maybeComponent):0,u=i||Ja;return"["+o.map(function(e){return u(e,t)}).join(",")+"]"+(c?","+c:"")}}function Ka(e){return void 0!==e.for||"template"===e.tag||"slot"===e.tag}function Ja(e,t){return 1===e.type?Pa(e,t):3===e.type&&e.isComment?(r=e,"_e("+JSON.stringify(r.text)+")"):"_v("+(2===(n=e).type?n.expression:Wa(JSON.stringify(n.text)))+")";var n,r}function qa(e){for(var t="",n="",r=0;r<e.length;r++){var i=e[r],o=Wa(i.value);i.dynamic?n+=i.name+","+o+",":t+='"'+i.name+'":'+o+","}return t="{"+t.slice(0,-1)+"}",n?"_d("+t+",["+n.slice(0,-1)+"])":t}function Wa(e){return e.replace(/\u2028/g,"\\u2028").replace(/\u2029/g,"\\u2029")}new RegExp("\\b"+"do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,super,throw,while,yield,delete,export,import,return,switch,default,extends,finally,continue,debugger,function,arguments".split(",").join("\\b|\\b")+"\\b");function Za(e,t){try{return new Function(e)}catch(n){return t.push({err:n,code:e}),S}}function Ga(e){var t=Object.create(null);return function(n,r,i){(r=k({},r)).warn;delete r.warn;var o=r.delimiters?String(r.delimiters)+n:n;if(t[o])return t[o];var a=e(n,r),s={},c=[];return s.render=Za(a.render,c),s.staticRenderFns=a.staticRenderFns.map(function(e){return Za(e,c)}),t[o]=s}}var Xa,Ya,Qa=(Xa=function(e,t){var n=ca(e.trim(),t);!1!==t.optimize&&Ca(n,t);var r=Da(n,t);return{ast:n,render:r.render,staticRenderFns:r.staticRenderFns}},function(e){function t(t,n){var r=Object.create(e),i=[],o=[];if(n)for(var a in n.modules&&(r.modules=(e.modules||[]).concat(n.modules)),n.directives&&(r.directives=k(Object.create(e.directives||null),n.directives)),n)"modules"!==a&&"directives"!==a&&(r[a]=n[a]);r.warn=function(e,t,n){(n?o:i).push(e)};var s=Xa(t.trim(),r);return s.errors=i,s.tips=o,s}return{compile:t,compileToFunctions:Ga(t)}})($a),es=(Qa.compile,Qa.compileToFunctions);function ts(e){return(Ya=Ya||document.createElement("div")).innerHTML=e?'<a href="\n"/>':'<div a="\n"/>',Ya.innerHTML.indexOf("&#10;")>0}var ns=!!U&&ts(!1),rs=!!U&&ts(!0),is=g(function(e){var t=Gn(e);return t&&t.innerHTML}),os=bn.prototype.$mount;return bn.prototype.$mount=function(e,t){if((e=e&&Gn(e))===document.body||e===document.documentElement)return this;var n=this.$options;if(!n.render){var r=n.template;if(r)if("string"==typeof r)"#"===r.charAt(0)&&(r=is(r));else{if(!r.nodeType)return this;r=r.innerHTML}else e&&(r=function(e){if(e.outerHTML)return e.outerHTML;var t=document.createElement("div");return t.appendChild(e.cloneNode(!0)),t.innerHTML}(e));if(r){var i=es(r,{outputSourceRange:!1,shouldDecodeNewlines:ns,shouldDecodeNewlinesForHref:rs,delimiters:n.delimiters,comments:n.comments},this),o=i.render,a=i.staticRenderFns;n.render=o,n.staticRenderFns=a}}return os.call(this,e,t)},bn.compile=es,bn});
\ No newline at end of file
diff --git a/dist/vue.runtime.common.dev.js b/dist/vue.runtime.common.dev.js
index 389e6632973..452f825a0ad 100644
--- a/dist/vue.runtime.common.dev.js
+++ b/dist/vue.runtime.common.dev.js
@@ -1,5 +1,5 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
@@ -525,6 +525,7 @@ var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android'
 var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
 var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 var isPhantomJS = UA && /phantomjs/.test(UA);
+var isFF = UA && UA.match(/firefox\/(\d+)/);
 
 // Firefox has a "watch" function on Object.prototype...
 var nativeWatch = ({}).watch;
@@ -2395,2437 +2396,2439 @@ function normalizeArrayChildren (children, nestedIndex) {
 
 /*  */
 
-function ensureCtor (comp, base) {
-  if (
-    comp.__esModule ||
-    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-  ) {
-    comp = comp.default;
+function initProvide (vm) {
+  var provide = vm.$options.provide;
+  if (provide) {
+    vm._provided = typeof provide === 'function'
+      ? provide.call(vm)
+      : provide;
   }
-  return isObject(comp)
-    ? base.extend(comp)
-    : comp
-}
-
-function createAsyncPlaceholder (
-  factory,
-  data,
-  context,
-  children,
-  tag
-) {
-  var node = createEmptyVNode();
-  node.asyncFactory = factory;
-  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-  return node
 }
 
-function resolveAsyncComponent (
-  factory,
-  baseCtor,
-  context
-) {
-  if (isTrue(factory.error) && isDef(factory.errorComp)) {
-    return factory.errorComp
-  }
-
-  if (isDef(factory.resolved)) {
-    return factory.resolved
-  }
-
-  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-    return factory.loadingComp
-  }
-
-  if (isDef(factory.contexts)) {
-    // already pending
-    factory.contexts.push(context);
-  } else {
-    var contexts = factory.contexts = [context];
-    var sync = true;
-
-    var forceRender = function (renderCompleted) {
-      for (var i = 0, l = contexts.length; i < l; i++) {
-        contexts[i].$forceUpdate();
-      }
-
-      if (renderCompleted) {
-        contexts.length = 0;
-      }
-    };
-
-    var resolve = once(function (res) {
-      // cache resolved
-      factory.resolved = ensureCtor(res, baseCtor);
-      // invoke callbacks only if this is not a synchronous resolve
-      // (async resolves are shimmed as synchronous during SSR)
-      if (!sync) {
-        forceRender(true);
-      } else {
-        contexts.length = 0;
-      }
-    });
-
-    var reject = once(function (reason) {
-      warn(
-        "Failed to resolve async component: " + (String(factory)) +
-        (reason ? ("\nReason: " + reason) : '')
-      );
-      if (isDef(factory.errorComp)) {
-        factory.error = true;
-        forceRender(true);
+function initInjections (vm) {
+  var result = resolveInject(vm.$options.inject, vm);
+  if (result) {
+    toggleObserving(false);
+    Object.keys(result).forEach(function (key) {
+      /* istanbul ignore else */
+      {
+        defineReactive$$1(vm, key, result[key], function () {
+          warn(
+            "Avoid mutating an injected value directly since the changes will be " +
+            "overwritten whenever the provided component re-renders. " +
+            "injection being mutated: \"" + key + "\"",
+            vm
+          );
+        });
       }
     });
+    toggleObserving(true);
+  }
+}
 
-    var res = factory(resolve, reject);
-
-    if (isObject(res)) {
-      if (isPromise(res)) {
-        // () => Promise
-        if (isUndef(factory.resolved)) {
-          res.then(resolve, reject);
-        }
-      } else if (isPromise(res.component)) {
-        res.component.then(resolve, reject);
-
-        if (isDef(res.error)) {
-          factory.errorComp = ensureCtor(res.error, baseCtor);
-        }
+function resolveInject (inject, vm) {
+  if (inject) {
+    // inject is :any because flow is not smart enough to figure out cached
+    var result = Object.create(null);
+    var keys = hasSymbol
+      ? Reflect.ownKeys(inject)
+      : Object.keys(inject);
 
-        if (isDef(res.loading)) {
-          factory.loadingComp = ensureCtor(res.loading, baseCtor);
-          if (res.delay === 0) {
-            factory.loading = true;
-          } else {
-            setTimeout(function () {
-              if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                factory.loading = true;
-                forceRender(false);
-              }
-            }, res.delay || 200);
-          }
+    for (var i = 0; i < keys.length; i++) {
+      var key = keys[i];
+      // #6574 in case the inject object is observed...
+      if (key === '__ob__') { continue }
+      var provideKey = inject[key].from;
+      var source = vm;
+      while (source) {
+        if (source._provided && hasOwn(source._provided, provideKey)) {
+          result[key] = source._provided[provideKey];
+          break
         }
-
-        if (isDef(res.timeout)) {
-          setTimeout(function () {
-            if (isUndef(factory.resolved)) {
-              reject(
-                "timeout (" + (res.timeout) + "ms)"
-              );
-            }
-          }, res.timeout);
+        source = source.$parent;
+      }
+      if (!source) {
+        if ('default' in inject[key]) {
+          var provideDefault = inject[key].default;
+          result[key] = typeof provideDefault === 'function'
+            ? provideDefault.call(vm)
+            : provideDefault;
+        } else {
+          warn(("Injection \"" + key + "\" not found"), vm);
         }
       }
     }
-
-    sync = false;
-    // return in case resolved synchronously
-    return factory.loading
-      ? factory.loadingComp
-      : factory.resolved
+    return result
   }
 }
 
 /*  */
 
-function isAsyncPlaceholder (node) {
-  return node.isComment && node.asyncFactory
-}
 
-/*  */
 
-function getFirstComponentChild (children) {
-  if (Array.isArray(children)) {
-    for (var i = 0; i < children.length; i++) {
-      var c = children[i];
-      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
-        return c
+/**
+ * Runtime helper for resolving raw children VNodes into a slot object.
+ */
+function resolveSlots (
+  children,
+  context
+) {
+  if (!children || !children.length) {
+    return {}
+  }
+  var slots = {};
+  for (var i = 0, l = children.length; i < l; i++) {
+    var child = children[i];
+    var data = child.data;
+    // remove slot attribute if the node is resolved as a Vue slot node
+    if (data && data.attrs && data.attrs.slot) {
+      delete data.attrs.slot;
+    }
+    // named slots should only be respected if the vnode was rendered in the
+    // same context.
+    if ((child.context === context || child.fnContext === context) &&
+      data && data.slot != null
+    ) {
+      var name = data.slot;
+      var slot = (slots[name] || (slots[name] = []));
+      if (child.tag === 'template') {
+        slot.push.apply(slot, child.children || []);
+      } else {
+        slot.push(child);
       }
+    } else {
+      (slots.default || (slots.default = [])).push(child);
+    }
+  }
+  // ignore slots that contains only whitespace
+  for (var name$1 in slots) {
+    if (slots[name$1].every(isWhitespace)) {
+      delete slots[name$1];
     }
   }
+  return slots
 }
 
-/*  */
+function isWhitespace (node) {
+  return (node.isComment && !node.asyncFactory) || node.text === ' '
+}
 
 /*  */
 
-function initEvents (vm) {
-  vm._events = Object.create(null);
-  vm._hasHookEvent = false;
-  // init parent attached events
-  var listeners = vm.$options._parentListeners;
-  if (listeners) {
-    updateComponentListeners(vm, listeners);
+function normalizeScopedSlots (
+  slots,
+  normalSlots
+) {
+  var res;
+  if (!slots) {
+    res = {};
+  } else if (slots._normalized) {
+    return slots
+  } else {
+    res = {};
+    for (var key in slots) {
+      if (slots[key] && key[0] !== '$') {
+        res[key] = normalizeScopedSlot(slots[key]);
+      }
+    }
+  }
+  // expose normal slots on scopedSlots
+  for (var key$1 in normalSlots) {
+    if (!(key$1 in res)) {
+      res[key$1] = proxyNormalSlot(normalSlots, key$1);
+    }
   }
+  def(res, '_normalized', true);
+  def(res, '$stable', slots ? !!slots.$stable : true);
+  return res
 }
 
-var target;
-
-function add (event, fn) {
-  target.$on(event, fn);
+function normalizeScopedSlot(fn) {
+  return function (scope) {
+    var res = fn(scope);
+    return res && typeof res === 'object' && !Array.isArray(res)
+      ? [res] // single vnode
+      : normalizeChildren(res)
+  }
 }
 
-function remove$1 (event, fn) {
-  target.$off(event, fn);
+function proxyNormalSlot(slots, key) {
+  return function () { return slots[key]; }
 }
 
-function createOnceHandler (event, fn) {
-  var _target = target;
-  return function onceHandler () {
-    var res = fn.apply(null, arguments);
-    if (res !== null) {
-      _target.$off(event, onceHandler);
-    }
-  }
-}
+/*  */
 
-function updateComponentListeners (
-  vm,
-  listeners,
-  oldListeners
+/**
+ * Runtime helper for rendering v-for lists.
+ */
+function renderList (
+  val,
+  render
 ) {
-  target = vm;
-  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-  target = undefined;
-}
-
-function eventsMixin (Vue) {
-  var hookRE = /^hook:/;
-  Vue.prototype.$on = function (event, fn) {
-    var vm = this;
-    if (Array.isArray(event)) {
-      for (var i = 0, l = event.length; i < l; i++) {
-        vm.$on(event[i], fn);
-      }
-    } else {
-      (vm._events[event] || (vm._events[event] = [])).push(fn);
-      // optimize hook:event cost by using a boolean flag marked at registration
-      // instead of a hash lookup
-      if (hookRE.test(event)) {
-        vm._hasHookEvent = true;
-      }
-    }
-    return vm
-  };
-
-  Vue.prototype.$once = function (event, fn) {
-    var vm = this;
-    function on () {
-      vm.$off(event, on);
-      fn.apply(vm, arguments);
-    }
-    on.fn = fn;
-    vm.$on(event, on);
-    return vm
-  };
-
-  Vue.prototype.$off = function (event, fn) {
-    var vm = this;
-    // all
-    if (!arguments.length) {
-      vm._events = Object.create(null);
-      return vm
-    }
-    // array of events
-    if (Array.isArray(event)) {
-      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
-        vm.$off(event[i$1], fn);
-      }
-      return vm
-    }
-    // specific event
-    var cbs = vm._events[event];
-    if (!cbs) {
-      return vm
-    }
-    if (!fn) {
-      vm._events[event] = null;
-      return vm
+  var ret, i, l, keys, key;
+  if (Array.isArray(val) || typeof val === 'string') {
+    ret = new Array(val.length);
+    for (i = 0, l = val.length; i < l; i++) {
+      ret[i] = render(val[i], i);
     }
-    // specific handler
-    var cb;
-    var i = cbs.length;
-    while (i--) {
-      cb = cbs[i];
-      if (cb === fn || cb.fn === fn) {
-        cbs.splice(i, 1);
-        break
-      }
+  } else if (typeof val === 'number') {
+    ret = new Array(val);
+    for (i = 0; i < val; i++) {
+      ret[i] = render(i + 1, i);
     }
-    return vm
-  };
-
-  Vue.prototype.$emit = function (event) {
-    var vm = this;
-    {
-      var lowerCaseEvent = event.toLowerCase();
-      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
-        tip(
-          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
-          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
-          "Note that HTML attributes are case-insensitive and you cannot use " +
-          "v-on to listen to camelCase events when using in-DOM templates. " +
-          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
-        );
+  } else if (isObject(val)) {
+    if (hasSymbol && val[Symbol.iterator]) {
+      ret = [];
+      var iterator = val[Symbol.iterator]();
+      var result = iterator.next();
+      while (!result.done) {
+        ret.push(render(result.value, ret.length));
+        result = iterator.next();
       }
-    }
-    var cbs = vm._events[event];
-    if (cbs) {
-      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
-      var args = toArray(arguments, 1);
-      var info = "event handler for \"" + event + "\"";
-      for (var i = 0, l = cbs.length; i < l; i++) {
-        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+    } else {
+      keys = Object.keys(val);
+      ret = new Array(keys.length);
+      for (i = 0, l = keys.length; i < l; i++) {
+        key = keys[i];
+        ret[i] = render(val[key], key, i);
       }
     }
-    return vm
-  };
+  }
+  if (!isDef(ret)) {
+    ret = [];
+  }
+  (ret)._isVList = true;
+  return ret
 }
 
 /*  */
 
-
-
 /**
- * Runtime helper for resolving raw children VNodes into a slot object.
+ * Runtime helper for rendering <slot>
  */
-function resolveSlots (
-  children,
-  context
+function renderSlot (
+  name,
+  fallback,
+  props,
+  bindObject
 ) {
-  if (!children || !children.length) {
-    return {}
-  }
-  var slots = {};
-  for (var i = 0, l = children.length; i < l; i++) {
-    var child = children[i];
-    var data = child.data;
-    // remove slot attribute if the node is resolved as a Vue slot node
-    if (data && data.attrs && data.attrs.slot) {
-      delete data.attrs.slot;
-    }
-    // named slots should only be respected if the vnode was rendered in the
-    // same context.
-    if ((child.context === context || child.fnContext === context) &&
-      data && data.slot != null
-    ) {
-      var name = data.slot;
-      var slot = (slots[name] || (slots[name] = []));
-      if (child.tag === 'template') {
-        slot.push.apply(slot, child.children || []);
-      } else {
-        slot.push(child);
+  var scopedSlotFn = this.$scopedSlots[name];
+  var nodes;
+  if (scopedSlotFn) { // scoped slot
+    props = props || {};
+    if (bindObject) {
+      if (!isObject(bindObject)) {
+        warn(
+          'slot v-bind without argument expects an Object',
+          this
+        );
       }
-    } else {
-      (slots.default || (slots.default = [])).push(child);
-    }
-  }
-  // ignore slots that contains only whitespace
-  for (var name$1 in slots) {
-    if (slots[name$1].every(isWhitespace)) {
-      delete slots[name$1];
+      props = extend(extend({}, bindObject), props);
     }
+    nodes = scopedSlotFn(props) || fallback;
+  } else {
+    nodes = this.$slots[name] || fallback;
   }
-  return slots
-}
-
-function isWhitespace (node) {
-  return (node.isComment && !node.asyncFactory) || node.text === ' '
-}
 
-function resolveScopedSlots (
-  fns, // see flow/vnode
-  hasDynamicKeys,
-  res
-) {
-  res = res || { $stable: !hasDynamicKeys };
-  for (var i = 0; i < fns.length; i++) {
-    var slot = fns[i];
-    if (Array.isArray(slot)) {
-      resolveScopedSlots(slot, hasDynamicKeys, res);
-    } else if (slot) {
-      res[slot.key] = slot.fn;
-    }
+  var target = props && props.slot;
+  if (target) {
+    return this.$createElement('template', { slot: target }, nodes)
+  } else {
+    return nodes
   }
-  return res
 }
 
 /*  */
 
-var activeInstance = null;
-var isUpdatingChildComponent = false;
-
-function setActiveInstance(vm) {
-  var prevActiveInstance = activeInstance;
-  activeInstance = vm;
-  return function () {
-    activeInstance = prevActiveInstance;
-  }
+/**
+ * Runtime helper for resolving filters
+ */
+function resolveFilter (id) {
+  return resolveAsset(this.$options, 'filters', id, true) || identity
 }
 
-function initLifecycle (vm) {
-  var options = vm.$options;
+/*  */
 
-  // locate first non-abstract parent
-  var parent = options.parent;
-  if (parent && !options.abstract) {
-    while (parent.$options.abstract && parent.$parent) {
-      parent = parent.$parent;
-    }
-    parent.$children.push(vm);
+function isKeyNotMatch (expect, actual) {
+  if (Array.isArray(expect)) {
+    return expect.indexOf(actual) === -1
+  } else {
+    return expect !== actual
   }
+}
 
-  vm.$parent = parent;
-  vm.$root = parent ? parent.$root : vm;
-
-  vm.$children = [];
-  vm.$refs = {};
-
-  vm._watcher = null;
-  vm._inactive = null;
-  vm._directInactive = false;
-  vm._isMounted = false;
-  vm._isDestroyed = false;
-  vm._isBeingDestroyed = false;
+/**
+ * Runtime helper for checking keyCodes from config.
+ * exposed as Vue.prototype._k
+ * passing in eventKeyName as last argument separately for backwards compat
+ */
+function checkKeyCodes (
+  eventKeyCode,
+  key,
+  builtInKeyCode,
+  eventKeyName,
+  builtInKeyName
+) {
+  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+    return isKeyNotMatch(builtInKeyName, eventKeyName)
+  } else if (mappedKeyCode) {
+    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+  } else if (eventKeyName) {
+    return hyphenate(eventKeyName) !== key
+  }
 }
 
-function lifecycleMixin (Vue) {
-  Vue.prototype._update = function (vnode, hydrating) {
-    var vm = this;
-    var prevEl = vm.$el;
-    var prevVnode = vm._vnode;
-    var restoreActiveInstance = setActiveInstance(vm);
-    vm._vnode = vnode;
-    // Vue.prototype.__patch__ is injected in entry points
-    // based on the rendering backend used.
-    if (!prevVnode) {
-      // initial render
-      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+/*  */
+
+/**
+ * Runtime helper for merging v-bind="object" into a VNode's data.
+ */
+function bindObjectProps (
+  data,
+  tag,
+  value,
+  asProp,
+  isSync
+) {
+  if (value) {
+    if (!isObject(value)) {
+      warn(
+        'v-bind without argument expects an Object or Array value',
+        this
+      );
     } else {
-      // updates
-      vm.$el = vm.__patch__(prevVnode, vnode);
-    }
-    restoreActiveInstance();
-    // update __vue__ reference
-    if (prevEl) {
-      prevEl.__vue__ = null;
-    }
-    if (vm.$el) {
-      vm.$el.__vue__ = vm;
-    }
-    // if parent is an HOC, update its $el as well
-    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
-      vm.$parent.$el = vm.$el;
-    }
-    // updated hook is called by the scheduler to ensure that children are
-    // updated in a parent's updated hook.
-  };
+      if (Array.isArray(value)) {
+        value = toObject(value);
+      }
+      var hash;
+      var loop = function ( key ) {
+        if (
+          key === 'class' ||
+          key === 'style' ||
+          isReservedAttribute(key)
+        ) {
+          hash = data;
+        } else {
+          var type = data.attrs && data.attrs.type;
+          hash = asProp || config.mustUseProp(tag, type, key)
+            ? data.domProps || (data.domProps = {})
+            : data.attrs || (data.attrs = {});
+        }
+        var camelizedKey = camelize(key);
+        if (!(key in hash) && !(camelizedKey in hash)) {
+          hash[key] = value[key];
 
-  Vue.prototype.$forceUpdate = function () {
-    var vm = this;
-    if (vm._watcher) {
-      vm._watcher.update();
-    }
-  };
+          if (isSync) {
+            var on = data.on || (data.on = {});
+            on[("update:" + camelizedKey)] = function ($event) {
+              value[key] = $event;
+            };
+          }
+        }
+      };
 
-  Vue.prototype.$destroy = function () {
-    var vm = this;
-    if (vm._isBeingDestroyed) {
-      return
-    }
-    callHook(vm, 'beforeDestroy');
-    vm._isBeingDestroyed = true;
-    // remove self from parent
-    var parent = vm.$parent;
-    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
-      remove(parent.$children, vm);
-    }
-    // teardown watchers
-    if (vm._watcher) {
-      vm._watcher.teardown();
-    }
-    var i = vm._watchers.length;
-    while (i--) {
-      vm._watchers[i].teardown();
-    }
-    // remove reference from data ob
-    // frozen object may not have observer.
-    if (vm._data.__ob__) {
-      vm._data.__ob__.vmCount--;
-    }
-    // call the last hook...
-    vm._isDestroyed = true;
-    // invoke destroy hooks on current rendered tree
-    vm.__patch__(vm._vnode, null);
-    // fire destroyed hook
-    callHook(vm, 'destroyed');
-    // turn off all instance listeners.
-    vm.$off();
-    // remove __vue__ reference
-    if (vm.$el) {
-      vm.$el.__vue__ = null;
-    }
-    // release circular reference (#6759)
-    if (vm.$vnode) {
-      vm.$vnode.parent = null;
+      for (var key in value) loop( key );
     }
-  };
+  }
+  return data
 }
 
-function mountComponent (
-  vm,
-  el,
-  hydrating
+/*  */
+
+/**
+ * Runtime helper for rendering static trees.
+ */
+function renderStatic (
+  index,
+  isInFor
 ) {
-  vm.$el = el;
-  if (!vm.$options.render) {
-    vm.$options.render = createEmptyVNode;
-    {
-      /* istanbul ignore if */
-      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
-        vm.$options.el || el) {
-        warn(
-          'You are using the runtime-only build of Vue where the template ' +
-          'compiler is not available. Either pre-compile the templates into ' +
-          'render functions, or use the compiler-included build.',
-          vm
-        );
-      } else {
-        warn(
-          'Failed to mount component: template or render function not defined.',
-          vm
-        );
-      }
-    }
+  var cached = this._staticTrees || (this._staticTrees = []);
+  var tree = cached[index];
+  // if has already-rendered static tree and not inside v-for,
+  // we can reuse the same tree.
+  if (tree && !isInFor) {
+    return tree
   }
-  callHook(vm, 'beforeMount');
-
-  var updateComponent;
-  /* istanbul ignore if */
-  if (config.performance && mark) {
-    updateComponent = function () {
-      var name = vm._name;
-      var id = vm._uid;
-      var startTag = "vue-perf-start:" + id;
-      var endTag = "vue-perf-end:" + id;
+  // otherwise, render a fresh tree.
+  tree = cached[index] = this.$options.staticRenderFns[index].call(
+    this._renderProxy,
+    null,
+    this // for render fns generated for functional component templates
+  );
+  markStatic(tree, ("__static__" + index), false);
+  return tree
+}
 
-      mark(startTag);
-      var vnode = vm._render();
-      mark(endTag);
-      measure(("vue " + name + " render"), startTag, endTag);
+/**
+ * Runtime helper for v-once.
+ * Effectively it means marking the node as static with a unique key.
+ */
+function markOnce (
+  tree,
+  index,
+  key
+) {
+  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+  return tree
+}
 
-      mark(startTag);
-      vm._update(vnode, hydrating);
-      mark(endTag);
-      measure(("vue " + name + " patch"), startTag, endTag);
-    };
+function markStatic (
+  tree,
+  key,
+  isOnce
+) {
+  if (Array.isArray(tree)) {
+    for (var i = 0; i < tree.length; i++) {
+      if (tree[i] && typeof tree[i] !== 'string') {
+        markStaticNode(tree[i], (key + "_" + i), isOnce);
+      }
+    }
   } else {
-    updateComponent = function () {
-      vm._update(vm._render(), hydrating);
-    };
+    markStaticNode(tree, key, isOnce);
   }
+}
 
-  // we set this to vm._watcher inside the watcher's constructor
-  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
-  // component's mounted hook), which relies on vm._watcher being already defined
-  new Watcher(vm, updateComponent, noop, {
-    before: function before () {
-      if (vm._isMounted && !vm._isDestroyed) {
-        callHook(vm, 'beforeUpdate');
+function markStaticNode (node, key, isOnce) {
+  node.isStatic = true;
+  node.key = key;
+  node.isOnce = isOnce;
+}
+
+/*  */
+
+function bindObjectListeners (data, value) {
+  if (value) {
+    if (!isPlainObject(value)) {
+      warn(
+        'v-on without argument expects an Object value',
+        this
+      );
+    } else {
+      var on = data.on = data.on ? extend({}, data.on) : {};
+      for (var key in value) {
+        var existing = on[key];
+        var ours = value[key];
+        on[key] = existing ? [].concat(existing, ours) : ours;
       }
     }
-  }, true /* isRenderWatcher */);
-  hydrating = false;
-
-  // manually mounted instance, call mounted on self
-  // mounted is called for render-created child components in its inserted hook
-  if (vm.$vnode == null) {
-    vm._isMounted = true;
-    callHook(vm, 'mounted');
   }
-  return vm
+  return data
 }
 
-function updateChildComponent (
-  vm,
-  propsData,
-  listeners,
-  parentVnode,
-  renderChildren
+/*  */
+
+function resolveScopedSlots (
+  fns, // see flow/vnode
+  hasDynamicKeys,
+  res
 ) {
-  {
-    isUpdatingChildComponent = true;
+  res = res || { $stable: !hasDynamicKeys };
+  for (var i = 0; i < fns.length; i++) {
+    var slot = fns[i];
+    if (Array.isArray(slot)) {
+      resolveScopedSlots(slot, hasDynamicKeys, res);
+    } else if (slot) {
+      res[slot.key] = slot.fn;
+    }
   }
+  return res
+}
 
-  // determine whether component has slot children
-  // we need to do this before overwriting $options._renderChildren.
+/*  */
 
-  // check if there are dynamic scopedSlots (hand-written or compiled but with
-  // dynamic slot names). Static scoped slots compiled from template has the
-  // "$stable" marker.
-  var hasDynamicScopedSlot = !!(
-    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-  );
-  // Any static slot children from the parent may have changed during parent's
-  // update. Dynamic scoped slots may also have changed. In such cases, a forced
-  // update is necessary to ensure correctness.
-  var needsForceUpdate = !!(
-    renderChildren ||               // has new static slots
-    vm.$options._renderChildren ||  // has old static slots
-    hasDynamicScopedSlot
-  );
+function bindDynamicKeys (baseObj, values) {
+  for (var i = 0; i < values.length; i += 2) {
+    var key = values[i];
+    if (typeof key === 'string' && key) {
+      baseObj[values[i]] = values[i + 1];
+    } else if (key !== '' && key !== null) {
+      // null is a speical value for explicitly removing a binding
+      warn(
+        ("Invalid value for dynamic directive argument (expected string or null): " + key),
+        this
+      );
+    }
+  }
+  return baseObj
+}
 
-  vm.$options._parentVnode = parentVnode;
-  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+// helper to dynamically append modifier runtime markers to event names.
+// ensure only append when value is already string, otherwise it will be cast
+// to string and cause the type check to miss.
+function prependModifier (value, symbol) {
+  return typeof value === 'string' ? symbol + value : value
+}
 
-  if (vm._vnode) { // update child tree's parent
-    vm._vnode.parent = parentVnode;
-  }
-  vm.$options._renderChildren = renderChildren;
+/*  */
 
-  // update $attrs and $listeners hash
-  // these are also reactive so they may trigger child update if the child
-  // used them during render
-  vm.$attrs = parentVnode.data.attrs || emptyObject;
-  vm.$listeners = listeners || emptyObject;
+function installRenderHelpers (target) {
+  target._o = markOnce;
+  target._n = toNumber;
+  target._s = toString;
+  target._l = renderList;
+  target._t = renderSlot;
+  target._q = looseEqual;
+  target._i = looseIndexOf;
+  target._m = renderStatic;
+  target._f = resolveFilter;
+  target._k = checkKeyCodes;
+  target._b = bindObjectProps;
+  target._v = createTextVNode;
+  target._e = createEmptyVNode;
+  target._u = resolveScopedSlots;
+  target._g = bindObjectListeners;
+  target._d = bindDynamicKeys;
+  target._p = prependModifier;
+}
 
-  // update props
-  if (propsData && vm.$options.props) {
-    toggleObserving(false);
-    var props = vm._props;
-    var propKeys = vm.$options._propKeys || [];
-    for (var i = 0; i < propKeys.length; i++) {
-      var key = propKeys[i];
-      var propOptions = vm.$options.props; // wtf flow?
-      props[key] = validateProp(key, propOptions, propsData, vm);
-    }
-    toggleObserving(true);
-    // keep a copy of raw propsData
-    vm.$options.propsData = propsData;
+/*  */
+
+function FunctionalRenderContext (
+  data,
+  props,
+  children,
+  parent,
+  Ctor
+) {
+  var options = Ctor.options;
+  // ensure the createElement function in functional components
+  // gets a unique context - this is necessary for correct named slot check
+  var contextVm;
+  if (hasOwn(parent, '_uid')) {
+    contextVm = Object.create(parent);
+    // $flow-disable-line
+    contextVm._original = parent;
+  } else {
+    // the context vm passed in is a functional context as well.
+    // in this case we want to make sure we are able to get a hold to the
+    // real context instance.
+    contextVm = parent;
+    // $flow-disable-line
+    parent = parent._original;
   }
+  var isCompiled = isTrue(options._compiled);
+  var needNormalization = !isCompiled;
 
-  // update listeners
-  listeners = listeners || emptyObject;
-  var oldListeners = vm.$options._parentListeners;
-  vm.$options._parentListeners = listeners;
-  updateComponentListeners(vm, listeners, oldListeners);
+  this.data = data;
+  this.props = props;
+  this.children = children;
+  this.parent = parent;
+  this.listeners = data.on || emptyObject;
+  this.injections = resolveInject(options.inject, parent);
+  this.slots = function () { return resolveSlots(children, parent); };
 
-  // resolve slots + force update if has children
-  if (needsForceUpdate) {
-    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-    vm.$forceUpdate();
-  }
+  Object.defineProperty(this, 'scopedSlots', ({
+    enumerable: true,
+    get: function get () {
+      return normalizeScopedSlots(data.scopedSlots, this.slots())
+    }
+  }));
 
-  {
-    isUpdatingChildComponent = false;
+  // support for compiled functional template
+  if (isCompiled) {
+    // exposing $options for renderStatic()
+    this.$options = options;
+    // pre-resolve slots for renderSlot()
+    this.$slots = this.slots();
+    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
   }
-}
 
-function isInInactiveTree (vm) {
-  while (vm && (vm = vm.$parent)) {
-    if (vm._inactive) { return true }
+  if (options._scopeId) {
+    this._c = function (a, b, c, d) {
+      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
+      if (vnode && !Array.isArray(vnode)) {
+        vnode.fnScopeId = options._scopeId;
+        vnode.fnContext = parent;
+      }
+      return vnode
+    };
+  } else {
+    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
   }
-  return false
 }
 
-function activateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = false;
-    if (isInInactiveTree(vm)) {
-      return
+installRenderHelpers(FunctionalRenderContext.prototype);
+
+function createFunctionalComponent (
+  Ctor,
+  propsData,
+  data,
+  contextVm,
+  children
+) {
+  var options = Ctor.options;
+  var props = {};
+  var propOptions = options.props;
+  if (isDef(propOptions)) {
+    for (var key in propOptions) {
+      props[key] = validateProp(key, propOptions, propsData || emptyObject);
     }
-  } else if (vm._directInactive) {
-    return
+  } else {
+    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
+    if (isDef(data.props)) { mergeProps(props, data.props); }
   }
-  if (vm._inactive || vm._inactive === null) {
-    vm._inactive = false;
-    for (var i = 0; i < vm.$children.length; i++) {
-      activateChildComponent(vm.$children[i]);
+
+  var renderContext = new FunctionalRenderContext(
+    data,
+    props,
+    children,
+    contextVm,
+    Ctor
+  );
+
+  var vnode = options.render.call(null, renderContext._c, renderContext);
+
+  if (vnode instanceof VNode) {
+    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+  } else if (Array.isArray(vnode)) {
+    var vnodes = normalizeChildren(vnode) || [];
+    var res = new Array(vnodes.length);
+    for (var i = 0; i < vnodes.length; i++) {
+      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
     }
-    callHook(vm, 'activated');
+    return res
   }
 }
 
-function deactivateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = true;
-    if (isInInactiveTree(vm)) {
-      return
-    }
+function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+  // #7817 clone node before setting fnContext, otherwise if the node is reused
+  // (e.g. it was from a cached normal slot) the fnContext causes named slots
+  // that should not be matched to match.
+  var clone = cloneVNode(vnode);
+  clone.fnContext = contextVm;
+  clone.fnOptions = options;
+  {
+    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
   }
-  if (!vm._inactive) {
-    vm._inactive = true;
-    for (var i = 0; i < vm.$children.length; i++) {
-      deactivateChildComponent(vm.$children[i]);
-    }
-    callHook(vm, 'deactivated');
+  if (data.slot) {
+    (clone.data || (clone.data = {})).slot = data.slot;
   }
+  return clone
 }
 
-function callHook (vm, hook) {
-  // #7573 disable dep collection when invoking lifecycle hooks
-  pushTarget();
-  var handlers = vm.$options[hook];
-  var info = hook + " hook";
-  if (handlers) {
-    for (var i = 0, j = handlers.length; i < j; i++) {
-      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
-    }
-  }
-  if (vm._hasHookEvent) {
-    vm.$emit('hook:' + hook);
+function mergeProps (to, from) {
+  for (var key in from) {
+    to[camelize(key)] = from[key];
   }
-  popTarget();
 }
 
 /*  */
 
-var MAX_UPDATE_COUNT = 100;
+/*  */
 
-var queue = [];
-var activatedChildren = [];
-var has = {};
-var circular = {};
-var waiting = false;
-var flushing = false;
-var index = 0;
+/*  */
 
-/**
- * Reset the scheduler's state.
- */
-function resetSchedulerState () {
-  index = queue.length = activatedChildren.length = 0;
-  has = {};
-  {
-    circular = {};
-  }
-  waiting = flushing = false;
-}
+/*  */
 
-// Async edge case #6566 requires saving the timestamp when event listeners are
-// attached. However, calling performance.now() has a perf overhead especially
-// if the page has thousands of event listeners. Instead, we take a timestamp
-// every time the scheduler flushes and use that for all event listeners
-// attached during that flush.
-var currentFlushTimestamp = 0;
+// inline hooks to be invoked on component VNodes during patch
+var componentVNodeHooks = {
+  init: function init (vnode, hydrating) {
+    if (
+      vnode.componentInstance &&
+      !vnode.componentInstance._isDestroyed &&
+      vnode.data.keepAlive
+    ) {
+      // kept-alive components, treat as a patch
+      var mountedNode = vnode; // work around flow
+      componentVNodeHooks.prepatch(mountedNode, mountedNode);
+    } else {
+      var child = vnode.componentInstance = createComponentInstanceForVnode(
+        vnode,
+        activeInstance
+      );
+      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
+    }
+  },
 
-// Async edge case fix requires storing an event listener's attach timestamp.
-var getNow = Date.now;
+  prepatch: function prepatch (oldVnode, vnode) {
+    var options = vnode.componentOptions;
+    var child = vnode.componentInstance = oldVnode.componentInstance;
+    updateChildComponent(
+      child,
+      options.propsData, // updated props
+      options.listeners, // updated listeners
+      vnode, // new parent vnode
+      options.children // new children
+    );
+  },
 
-// Determine what event timestamp the browser is using. Annoyingly, the
-// timestamp can either be hi-res ( relative to poge load) or low-res
-// (relative to UNIX epoch), so in order to compare time we have to use the
-// same timestamp type when saving the flush timestamp.
-if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-  // if the low-res timestamp which is bigger than the event timestamp
-  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-  // and we need to use the hi-res version for event listeners as well.
-  getNow = function () { return performance.now(); };
-}
+  insert: function insert (vnode) {
+    var context = vnode.context;
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isMounted) {
+      componentInstance._isMounted = true;
+      callHook(componentInstance, 'mounted');
+    }
+    if (vnode.data.keepAlive) {
+      if (context._isMounted) {
+        // vue-router#1212
+        // During updates, a kept-alive component's child components may
+        // change, so directly walking the tree here may call activated hooks
+        // on incorrect children. Instead we push them into a queue which will
+        // be processed after the whole patch process ended.
+        queueActivatedComponent(componentInstance);
+      } else {
+        activateChildComponent(componentInstance, true /* direct */);
+      }
+    }
+  },
 
-/**
- * Flush both queues and run the watchers.
- */
-function flushSchedulerQueue () {
-  currentFlushTimestamp = getNow();
-  flushing = true;
-  var watcher, id;
+  destroy: function destroy (vnode) {
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isDestroyed) {
+      if (!vnode.data.keepAlive) {
+        componentInstance.$destroy();
+      } else {
+        deactivateChildComponent(componentInstance, true /* direct */);
+      }
+    }
+  }
+};
 
-  // Sort queue before flush.
-  // This ensures that:
-  // 1. Components are updated from parent to child. (because parent is always
-  //    created before the child)
-  // 2. A component's user watchers are run before its render watcher (because
-  //    user watchers are created before the render watcher)
-  // 3. If a component is destroyed during a parent component's watcher run,
-  //    its watchers can be skipped.
-  queue.sort(function (a, b) { return a.id - b.id; });
+var hooksToMerge = Object.keys(componentVNodeHooks);
 
-  // do not cache length because more watchers might be pushed
-  // as we run existing watchers
-  for (index = 0; index < queue.length; index++) {
-    watcher = queue[index];
-    if (watcher.before) {
-      watcher.before();
+function createComponent (
+  Ctor,
+  data,
+  context,
+  children,
+  tag
+) {
+  if (isUndef(Ctor)) {
+    return
+  }
+
+  var baseCtor = context.$options._base;
+
+  // plain options object: turn it into a constructor
+  if (isObject(Ctor)) {
+    Ctor = baseCtor.extend(Ctor);
+  }
+
+  // if at this stage it's not a constructor or an async component factory,
+  // reject.
+  if (typeof Ctor !== 'function') {
+    {
+      warn(("Invalid Component definition: " + (String(Ctor))), context);
     }
-    id = watcher.id;
-    has[id] = null;
-    watcher.run();
-    // in dev build, check and stop circular updates.
-    if (has[id] != null) {
-      circular[id] = (circular[id] || 0) + 1;
-      if (circular[id] > MAX_UPDATE_COUNT) {
-        warn(
-          'You may have an infinite update loop ' + (
-            watcher.user
-              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
-              : "in a component render function."
-          ),
-          watcher.vm
-        );
-        break
-      }
+    return
+  }
+
+  // async component
+  var asyncFactory;
+  if (isUndef(Ctor.cid)) {
+    asyncFactory = Ctor;
+    Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+    if (Ctor === undefined) {
+      // return a placeholder node for async component, which is rendered
+      // as a comment node but preserves all the raw information for the node.
+      // the information will be used for async server-rendering and hydration.
+      return createAsyncPlaceholder(
+        asyncFactory,
+        data,
+        context,
+        children,
+        tag
+      )
     }
   }
 
-  // keep copies of post queues before resetting state
-  var activatedQueue = activatedChildren.slice();
-  var updatedQueue = queue.slice();
+  data = data || {};
 
-  resetSchedulerState();
+  // resolve constructor options in case global mixins are applied after
+  // component constructor creation
+  resolveConstructorOptions(Ctor);
 
-  // call component updated and activated hooks
-  callActivatedHooks(activatedQueue);
-  callUpdatedHooks(updatedQueue);
+  // transform component v-model data into props & events
+  if (isDef(data.model)) {
+    transformModel(Ctor.options, data);
+  }
 
-  // devtool hook
-  /* istanbul ignore if */
-  if (devtools && config.devtools) {
-    devtools.emit('flush');
+  // extract props
+  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+
+  // functional component
+  if (isTrue(Ctor.options.functional)) {
+    return createFunctionalComponent(Ctor, propsData, data, context, children)
   }
-}
 
-function callUpdatedHooks (queue) {
-  var i = queue.length;
-  while (i--) {
-    var watcher = queue[i];
-    var vm = watcher.vm;
-    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
-      callHook(vm, 'updated');
+  // extract listeners, since these needs to be treated as
+  // child component listeners instead of DOM listeners
+  var listeners = data.on;
+  // replace with listeners with .native modifier
+  // so it gets processed during parent component patch.
+  data.on = data.nativeOn;
+
+  if (isTrue(Ctor.options.abstract)) {
+    // abstract components do not keep anything
+    // other than props & listeners & slot
+
+    // work around flow
+    var slot = data.slot;
+    data = {};
+    if (slot) {
+      data.slot = slot;
     }
   }
-}
 
-/**
- * Queue a kept-alive component that was activated during patch.
- * The queue will be processed after the entire tree has been patched.
- */
-function queueActivatedComponent (vm) {
-  // setting _inactive to false here so that a render function can
-  // rely on checking whether it's in an inactive tree (e.g. router-view)
-  vm._inactive = false;
-  activatedChildren.push(vm);
+  // install component management hooks onto the placeholder node
+  installComponentHooks(data);
+
+  // return a placeholder vnode
+  var name = Ctor.options.name || tag;
+  var vnode = new VNode(
+    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
+    data, undefined, undefined, undefined, context,
+    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
+    asyncFactory
+  );
+
+  return vnode
 }
 
-function callActivatedHooks (queue) {
-  for (var i = 0; i < queue.length; i++) {
-    queue[i]._inactive = true;
-    activateChildComponent(queue[i], true /* true */);
+function createComponentInstanceForVnode (
+  vnode, // we know it's MountedComponentVNode but flow doesn't
+  parent // activeInstance in lifecycle state
+) {
+  var options = {
+    _isComponent: true,
+    _parentVnode: vnode,
+    parent: parent
+  };
+  // check inline-template render functions
+  var inlineTemplate = vnode.data.inlineTemplate;
+  if (isDef(inlineTemplate)) {
+    options.render = inlineTemplate.render;
+    options.staticRenderFns = inlineTemplate.staticRenderFns;
   }
+  return new vnode.componentOptions.Ctor(options)
 }
 
-/**
- * Push a watcher into the watcher queue.
- * Jobs with duplicate IDs will be skipped unless it's
- * pushed when the queue is being flushed.
- */
-function queueWatcher (watcher) {
-  var id = watcher.id;
-  if (has[id] == null) {
-    has[id] = true;
-    if (!flushing) {
-      queue.push(watcher);
-    } else {
-      // if already flushing, splice the watcher based on its id
-      // if already past its id, it will be run next immediately.
-      var i = queue.length - 1;
-      while (i > index && queue[i].id > watcher.id) {
-        i--;
-      }
-      queue.splice(i + 1, 0, watcher);
+function installComponentHooks (data) {
+  var hooks = data.hook || (data.hook = {});
+  for (var i = 0; i < hooksToMerge.length; i++) {
+    var key = hooksToMerge[i];
+    var existing = hooks[key];
+    var toMerge = componentVNodeHooks[key];
+    if (existing !== toMerge && !(existing && existing._merged)) {
+      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
     }
-    // queue the flush
-    if (!waiting) {
-      waiting = true;
+  }
+}
 
-      if (!config.async) {
-        flushSchedulerQueue();
-        return
-      }
-      nextTick(flushSchedulerQueue);
+function mergeHook$1 (f1, f2) {
+  var merged = function (a, b) {
+    // flow complains about extra args which is why we use any
+    f1(a, b);
+    f2(a, b);
+  };
+  merged._merged = true;
+  return merged
+}
+
+// transform component v-model info (value and callback) into
+// prop and event handler respectively.
+function transformModel (options, data) {
+  var prop = (options.model && options.model.prop) || 'value';
+  var event = (options.model && options.model.event) || 'input'
+  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+  var on = data.on || (data.on = {});
+  var existing = on[event];
+  var callback = data.model.callback;
+  if (isDef(existing)) {
+    if (
+      Array.isArray(existing)
+        ? existing.indexOf(callback) === -1
+        : existing !== callback
+    ) {
+      on[event] = [callback].concat(existing);
     }
+  } else {
+    on[event] = callback;
   }
 }
 
 /*  */
 
+var SIMPLE_NORMALIZE = 1;
+var ALWAYS_NORMALIZE = 2;
 
+// wrapper function for providing a more flexible interface
+// without getting yelled at by flow
+function createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType,
+  alwaysNormalize
+) {
+  if (Array.isArray(data) || isPrimitive(data)) {
+    normalizationType = children;
+    children = data;
+    data = undefined;
+  }
+  if (isTrue(alwaysNormalize)) {
+    normalizationType = ALWAYS_NORMALIZE;
+  }
+  return _createElement(context, tag, data, children, normalizationType)
+}
 
-var uid$1 = 0;
-
-/**
- * A watcher parses an expression, collects dependencies,
- * and fires callback when the expression value changes.
- * This is used for both the $watch() api and directives.
- */
-var Watcher = function Watcher (
-  vm,
-  expOrFn,
-  cb,
-  options,
-  isRenderWatcher
+function _createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType
 ) {
-  this.vm = vm;
-  if (isRenderWatcher) {
-    vm._watcher = this;
+  if (isDef(data) && isDef((data).__ob__)) {
+    warn(
+      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+      'Always create fresh vnode data objects in each render!',
+      context
+    );
+    return createEmptyVNode()
   }
-  vm._watchers.push(this);
-  // options
-  if (options) {
-    this.deep = !!options.deep;
-    this.user = !!options.user;
-    this.lazy = !!options.lazy;
-    this.sync = !!options.sync;
-    this.before = options.before;
-  } else {
-    this.deep = this.user = this.lazy = this.sync = false;
+  // object syntax in v-bind
+  if (isDef(data) && isDef(data.is)) {
+    tag = data.is;
   }
-  this.cb = cb;
-  this.id = ++uid$1; // uid for batching
-  this.active = true;
-  this.dirty = this.lazy; // for lazy watchers
-  this.deps = [];
-  this.newDeps = [];
-  this.depIds = new _Set();
-  this.newDepIds = new _Set();
-  this.expression = expOrFn.toString();
-  // parse expression for getter
-  if (typeof expOrFn === 'function') {
-    this.getter = expOrFn;
-  } else {
-    this.getter = parsePath(expOrFn);
-    if (!this.getter) {
-      this.getter = noop;
+  if (!tag) {
+    // in case of component :is set to falsy value
+    return createEmptyVNode()
+  }
+  // warn against non-primitive key
+  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+  ) {
+    {
       warn(
-        "Failed watching path: \"" + expOrFn + "\" " +
-        'Watcher only accepts simple dot-delimited paths. ' +
-        'For full control, use a function instead.',
-        vm
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
       );
     }
   }
-  this.value = this.lazy
-    ? undefined
-    : this.get();
-};
-
-/**
- * Evaluate the getter, and re-collect dependencies.
- */
-Watcher.prototype.get = function get () {
-  pushTarget(this);
-  var value;
-  var vm = this.vm;
-  try {
-    value = this.getter.call(vm, vm);
-  } catch (e) {
-    if (this.user) {
-      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+  // support single function children as default scoped slot
+  if (Array.isArray(children) &&
+    typeof children[0] === 'function'
+  ) {
+    data = data || {};
+    data.scopedSlots = { default: children[0] };
+    children.length = 0;
+  }
+  if (normalizationType === ALWAYS_NORMALIZE) {
+    children = normalizeChildren(children);
+  } else if (normalizationType === SIMPLE_NORMALIZE) {
+    children = simpleNormalizeChildren(children);
+  }
+  var vnode, ns;
+  if (typeof tag === 'string') {
+    var Ctor;
+    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+    if (config.isReservedTag(tag)) {
+      // platform built-in elements
+      vnode = new VNode(
+        config.parsePlatformTagName(tag), data, children,
+        undefined, undefined, context
+      );
+    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+      // component
+      vnode = createComponent(Ctor, data, context, children, tag);
     } else {
-      throw e
-    }
-  } finally {
-    // "touch" every property so they are all tracked as
-    // dependencies for deep watching
-    if (this.deep) {
-      traverse(value);
+      // unknown or unlisted namespaced elements
+      // check at runtime because it may get assigned a namespace when its
+      // parent normalizes children
+      vnode = new VNode(
+        tag, data, children,
+        undefined, undefined, context
+      );
     }
-    popTarget();
-    this.cleanupDeps();
+  } else {
+    // direct component options / constructor
+    vnode = createComponent(tag, data, context, children);
   }
-  return value
-};
+  if (Array.isArray(vnode)) {
+    return vnode
+  } else if (isDef(vnode)) {
+    if (isDef(ns)) { applyNS(vnode, ns); }
+    if (isDef(data)) { registerDeepBindings(data); }
+    return vnode
+  } else {
+    return createEmptyVNode()
+  }
+}
 
-/**
- * Add a dependency to this directive.
- */
-Watcher.prototype.addDep = function addDep (dep) {
-  var id = dep.id;
-  if (!this.newDepIds.has(id)) {
-    this.newDepIds.add(id);
-    this.newDeps.push(dep);
-    if (!this.depIds.has(id)) {
-      dep.addSub(this);
+function applyNS (vnode, ns, force) {
+  vnode.ns = ns;
+  if (vnode.tag === 'foreignObject') {
+    // use default namespace inside foreignObject
+    ns = undefined;
+    force = true;
+  }
+  if (isDef(vnode.children)) {
+    for (var i = 0, l = vnode.children.length; i < l; i++) {
+      var child = vnode.children[i];
+      if (isDef(child.tag) && (
+        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+        applyNS(child, ns, force);
+      }
     }
   }
-};
+}
 
-/**
- * Clean up for dependency collection.
- */
-Watcher.prototype.cleanupDeps = function cleanupDeps () {
-  var i = this.deps.length;
-  while (i--) {
-    var dep = this.deps[i];
-    if (!this.newDepIds.has(dep.id)) {
-      dep.removeSub(this);
-    }
+// ref #5318
+// necessary to ensure parent re-render when deep bindings like :style and
+// :class are used on slot nodes
+function registerDeepBindings (data) {
+  if (isObject(data.style)) {
+    traverse(data.style);
   }
-  var tmp = this.depIds;
-  this.depIds = this.newDepIds;
-  this.newDepIds = tmp;
-  this.newDepIds.clear();
-  tmp = this.deps;
-  this.deps = this.newDeps;
-  this.newDeps = tmp;
-  this.newDeps.length = 0;
-};
+  if (isObject(data.class)) {
+    traverse(data.class);
+  }
+}
+
+/*  */
+
+function initRender (vm) {
+  vm._vnode = null; // the root of the child tree
+  vm._staticTrees = null; // v-once cached trees
+  var options = vm.$options;
+  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+  var renderContext = parentVnode && parentVnode.context;
+  vm.$slots = resolveSlots(options._renderChildren, renderContext);
+  vm.$scopedSlots = emptyObject;
+  // bind the createElement fn to this instance
+  // so that we get proper render context inside it.
+  // args order: tag, data, children, normalizationType, alwaysNormalize
+  // internal version is used by render functions compiled from templates
+  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
+  // normalization is always applied for the public version, used in
+  // user-written render functions.
+  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+
+  // $attrs & $listeners are exposed for easier HOC creation.
+  // they need to be reactive so that HOCs using them are always updated
+  var parentData = parentVnode && parentVnode.data;
 
-/**
- * Subscriber interface.
- * Will be called when a dependency changes.
- */
-Watcher.prototype.update = function update () {
   /* istanbul ignore else */
-  if (this.lazy) {
-    this.dirty = true;
-  } else if (this.sync) {
-    this.run();
-  } else {
-    queueWatcher(this);
+  {
+    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
+    }, true);
+    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
+    }, true);
   }
-};
+}
 
-/**
- * Scheduler job interface.
- * Will be called by the scheduler.
- */
-Watcher.prototype.run = function run () {
-  if (this.active) {
-    var value = this.get();
-    if (
-      value !== this.value ||
-      // Deep watchers and watchers on Object/Arrays should fire even
-      // when the value is the same, because the value may
-      // have mutated.
-      isObject(value) ||
-      this.deep
-    ) {
-      // set new value
-      var oldValue = this.value;
-      this.value = value;
-      if (this.user) {
-        try {
-          this.cb.call(this.vm, value, oldValue);
-        } catch (e) {
-          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
-        }
-      } else {
-        this.cb.call(this.vm, value, oldValue);
-      }
-    }
-  }
-};
+var currentRenderingInstance = null;
 
-/**
- * Evaluate the value of the watcher.
- * This only gets called for lazy watchers.
- */
-Watcher.prototype.evaluate = function evaluate () {
-  this.value = this.get();
-  this.dirty = false;
-};
+function renderMixin (Vue) {
+  // install runtime convenience helpers
+  installRenderHelpers(Vue.prototype);
 
-/**
- * Depend on all deps collected by this watcher.
- */
-Watcher.prototype.depend = function depend () {
-  var i = this.deps.length;
-  while (i--) {
-    this.deps[i].depend();
-  }
-};
+  Vue.prototype.$nextTick = function (fn) {
+    return nextTick(fn, this)
+  };
 
-/**
- * Remove self from all dependencies' subscriber list.
- */
-Watcher.prototype.teardown = function teardown () {
-  if (this.active) {
-    // remove self from vm's watcher list
-    // this is a somewhat expensive operation so we skip it
-    // if the vm is being destroyed.
-    if (!this.vm._isBeingDestroyed) {
-      remove(this.vm._watchers, this);
+  Vue.prototype._render = function () {
+    var vm = this;
+    var ref = vm.$options;
+    var render = ref.render;
+    var _parentVnode = ref._parentVnode;
+
+    if (_parentVnode) {
+      vm.$scopedSlots = normalizeScopedSlots(
+        _parentVnode.data.scopedSlots,
+        vm.$slots
+      );
     }
-    var i = this.deps.length;
-    while (i--) {
-      this.deps[i].removeSub(this);
+
+    // set parent vnode. this allows render functions to have access
+    // to the data on the placeholder node.
+    vm.$vnode = _parentVnode;
+    // render self
+    var vnode;
+    try {
+      // There's no need to maintain a stack becaues all render fns are called
+      // separately from one another. Nested component's render fns are called
+      // when parent component is patched.
+      currentRenderingInstance = vm;
+      vnode = render.call(vm._renderProxy, vm.$createElement);
+    } catch (e) {
+      handleError(e, vm, "render");
+      // return error render result,
+      // or previous vnode to prevent render error causing blank component
+      /* istanbul ignore else */
+      if (vm.$options.renderError) {
+        try {
+          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+        } catch (e) {
+          handleError(e, vm, "renderError");
+          vnode = vm._vnode;
+        }
+      } else {
+        vnode = vm._vnode;
+      }
+    } finally {
+      currentRenderingInstance = null;
     }
-    this.active = false;
-  }
-};
+    // if the returned array contains only a single node, allow it
+    if (Array.isArray(vnode) && vnode.length === 1) {
+      vnode = vnode[0];
+    }
+    // return empty vnode in case the render function errored out
+    if (!(vnode instanceof VNode)) {
+      if (Array.isArray(vnode)) {
+        warn(
+          'Multiple root nodes returned from render function. Render function ' +
+          'should return a single root node.',
+          vm
+        );
+      }
+      vnode = createEmptyVNode();
+    }
+    // set parent
+    vnode.parent = _parentVnode;
+    return vnode
+  };
+}
 
 /*  */
 
-var sharedPropertyDefinition = {
-  enumerable: true,
-  configurable: true,
-  get: noop,
-  set: noop
-};
+function ensureCtor (comp, base) {
+  if (
+    comp.__esModule ||
+    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+  ) {
+    comp = comp.default;
+  }
+  return isObject(comp)
+    ? base.extend(comp)
+    : comp
+}
 
-function proxy (target, sourceKey, key) {
-  sharedPropertyDefinition.get = function proxyGetter () {
-    return this[sourceKey][key]
-  };
-  sharedPropertyDefinition.set = function proxySetter (val) {
-    this[sourceKey][key] = val;
-  };
-  Object.defineProperty(target, key, sharedPropertyDefinition);
+function createAsyncPlaceholder (
+  factory,
+  data,
+  context,
+  children,
+  tag
+) {
+  var node = createEmptyVNode();
+  node.asyncFactory = factory;
+  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+  return node
 }
 
-function initState (vm) {
-  vm._watchers = [];
-  var opts = vm.$options;
-  if (opts.props) { initProps(vm, opts.props); }
-  if (opts.methods) { initMethods(vm, opts.methods); }
-  if (opts.data) {
-    initData(vm);
-  } else {
-    observe(vm._data = {}, true /* asRootData */);
+function resolveAsyncComponent (
+  factory,
+  baseCtor
+) {
+  if (isTrue(factory.error) && isDef(factory.errorComp)) {
+    return factory.errorComp
   }
-  if (opts.computed) { initComputed(vm, opts.computed); }
-  if (opts.watch && opts.watch !== nativeWatch) {
-    initWatch(vm, opts.watch);
+
+  if (isDef(factory.resolved)) {
+    return factory.resolved
   }
-}
 
-function initProps (vm, propsOptions) {
-  var propsData = vm.$options.propsData || {};
-  var props = vm._props = {};
-  // cache prop keys so that future props updates can iterate using Array
-  // instead of dynamic object key enumeration.
-  var keys = vm.$options._propKeys = [];
-  var isRoot = !vm.$parent;
-  // root instance props should be converted
-  if (!isRoot) {
-    toggleObserving(false);
+  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+    return factory.loadingComp
   }
-  var loop = function ( key ) {
-    keys.push(key);
-    var value = validateProp(key, propsOptions, propsData, vm);
-    /* istanbul ignore else */
-    {
-      var hyphenatedKey = hyphenate(key);
-      if (isReservedAttribute(hyphenatedKey) ||
-          config.isReservedAttr(hyphenatedKey)) {
-        warn(
-          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
-          vm
-        );
+
+  var owner = currentRenderingInstance;
+  if (isDef(factory.owners)) {
+    // already pending
+    factory.owners.push(owner);
+  } else {
+    var owners = factory.owners = [owner];
+    var sync = true;
+
+    var forceRender = function (renderCompleted) {
+      for (var i = 0, l = owners.length; i < l; i++) {
+        (owners[i]).$forceUpdate();
       }
-      defineReactive$$1(props, key, value, function () {
-        if (!isRoot && !isUpdatingChildComponent) {
-          warn(
-            "Avoid mutating a prop directly since the value will be " +
-            "overwritten whenever the parent component re-renders. " +
-            "Instead, use a data or computed property based on the prop's " +
-            "value. Prop being mutated: \"" + key + "\"",
-            vm
-          );
-        }
-      });
-    }
-    // static props are already proxied on the component's prototype
-    // during Vue.extend(). We only need to proxy props defined at
-    // instantiation here.
-    if (!(key in vm)) {
-      proxy(vm, "_props", key);
-    }
-  };
 
-  for (var key in propsOptions) loop( key );
-  toggleObserving(true);
-}
+      if (renderCompleted) {
+        owners.length = 0;
+      }
+    };
 
-function initData (vm) {
-  var data = vm.$options.data;
-  data = vm._data = typeof data === 'function'
-    ? getData(data, vm)
-    : data || {};
-  if (!isPlainObject(data)) {
-    data = {};
-    warn(
-      'data functions should return an object:\n' +
-      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
-      vm
-    );
-  }
-  // proxy data on instance
-  var keys = Object.keys(data);
-  var props = vm.$options.props;
-  var methods = vm.$options.methods;
-  var i = keys.length;
-  while (i--) {
-    var key = keys[i];
-    {
-      if (methods && hasOwn(methods, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a data property."),
-          vm
-        );
+    var resolve = once(function (res) {
+      // cache resolved
+      factory.resolved = ensureCtor(res, baseCtor);
+      // invoke callbacks only if this is not a synchronous resolve
+      // (async resolves are shimmed as synchronous during SSR)
+      if (!sync) {
+        forceRender(true);
+      } else {
+        owners.length = 0;
       }
-    }
-    if (props && hasOwn(props, key)) {
+    });
+
+    var reject = once(function (reason) {
       warn(
-        "The data property \"" + key + "\" is already declared as a prop. " +
-        "Use prop default value instead.",
-        vm
+        "Failed to resolve async component: " + (String(factory)) +
+        (reason ? ("\nReason: " + reason) : '')
       );
-    } else if (!isReserved(key)) {
-      proxy(vm, "_data", key);
-    }
-  }
-  // observe data
-  observe(data, true /* asRootData */);
-}
+      if (isDef(factory.errorComp)) {
+        factory.error = true;
+        forceRender(true);
+      }
+    });
+
+    var res = factory(resolve, reject);
+
+    if (isObject(res)) {
+      if (isPromise(res)) {
+        // () => Promise
+        if (isUndef(factory.resolved)) {
+          res.then(resolve, reject);
+        }
+      } else if (isPromise(res.component)) {
+        res.component.then(resolve, reject);
+
+        if (isDef(res.error)) {
+          factory.errorComp = ensureCtor(res.error, baseCtor);
+        }
+
+        if (isDef(res.loading)) {
+          factory.loadingComp = ensureCtor(res.loading, baseCtor);
+          if (res.delay === 0) {
+            factory.loading = true;
+          } else {
+            setTimeout(function () {
+              if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                factory.loading = true;
+                forceRender(false);
+              }
+            }, res.delay || 200);
+          }
+        }
+
+        if (isDef(res.timeout)) {
+          setTimeout(function () {
+            if (isUndef(factory.resolved)) {
+              reject(
+                "timeout (" + (res.timeout) + "ms)"
+              );
+            }
+          }, res.timeout);
+        }
+      }
+    }
 
-function getData (data, vm) {
-  // #7573 disable dep collection when invoking data getters
-  pushTarget();
-  try {
-    return data.call(vm, vm)
-  } catch (e) {
-    handleError(e, vm, "data()");
-    return {}
-  } finally {
-    popTarget();
+    sync = false;
+    // return in case resolved synchronously
+    return factory.loading
+      ? factory.loadingComp
+      : factory.resolved
   }
 }
 
-var computedWatcherOptions = { lazy: true };
-
-function initComputed (vm, computed) {
-  // $flow-disable-line
-  var watchers = vm._computedWatchers = Object.create(null);
-  // computed properties are just getters during SSR
-  var isSSR = isServerRendering();
+/*  */
 
-  for (var key in computed) {
-    var userDef = computed[key];
-    var getter = typeof userDef === 'function' ? userDef : userDef.get;
-    if (getter == null) {
-      warn(
-        ("Getter is missing for computed property \"" + key + "\"."),
-        vm
-      );
-    }
+function isAsyncPlaceholder (node) {
+  return node.isComment && node.asyncFactory
+}
 
-    if (!isSSR) {
-      // create internal watcher for the computed property.
-      watchers[key] = new Watcher(
-        vm,
-        getter || noop,
-        noop,
-        computedWatcherOptions
-      );
-    }
+/*  */
 
-    // component-defined computed properties are already defined on the
-    // component prototype. We only need to define computed properties defined
-    // at instantiation here.
-    if (!(key in vm)) {
-      defineComputed(vm, key, userDef);
-    } else {
-      if (key in vm.$data) {
-        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
-      } else if (vm.$options.props && key in vm.$options.props) {
-        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+function getFirstComponentChild (children) {
+  if (Array.isArray(children)) {
+    for (var i = 0; i < children.length; i++) {
+      var c = children[i];
+      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+        return c
       }
     }
   }
 }
 
-function defineComputed (
-  target,
-  key,
-  userDef
-) {
-  var shouldCache = !isServerRendering();
-  if (typeof userDef === 'function') {
-    sharedPropertyDefinition.get = shouldCache
-      ? createComputedGetter(key)
-      : createGetterInvoker(userDef);
-    sharedPropertyDefinition.set = noop;
-  } else {
-    sharedPropertyDefinition.get = userDef.get
-      ? shouldCache && userDef.cache !== false
-        ? createComputedGetter(key)
-        : createGetterInvoker(userDef.get)
-      : noop;
-    sharedPropertyDefinition.set = userDef.set || noop;
-  }
-  if (sharedPropertyDefinition.set === noop) {
-    sharedPropertyDefinition.set = function () {
-      warn(
-        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
-        this
-      );
-    };
-  }
-  Object.defineProperty(target, key, sharedPropertyDefinition);
-}
+/*  */
 
-function createComputedGetter (key) {
-  return function computedGetter () {
-    var watcher = this._computedWatchers && this._computedWatchers[key];
-    if (watcher) {
-      if (watcher.dirty) {
-        watcher.evaluate();
-      }
-      if (Dep.target) {
-        watcher.depend();
-      }
-      return watcher.value
-    }
+/*  */
+
+function initEvents (vm) {
+  vm._events = Object.create(null);
+  vm._hasHookEvent = false;
+  // init parent attached events
+  var listeners = vm.$options._parentListeners;
+  if (listeners) {
+    updateComponentListeners(vm, listeners);
   }
 }
 
-function createGetterInvoker(fn) {
-  return function computedGetter () {
-    return fn.call(this, this)
-  }
+var target;
+
+function add (event, fn) {
+  target.$on(event, fn);
 }
 
-function initMethods (vm, methods) {
-  var props = vm.$options.props;
-  for (var key in methods) {
-    {
-      if (typeof methods[key] !== 'function') {
-        warn(
-          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
-          "Did you reference the function correctly?",
-          vm
-        );
-      }
-      if (props && hasOwn(props, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a prop."),
-          vm
-        );
-      }
-      if ((key in vm) && isReserved(key)) {
-        warn(
-          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
-          "Avoid defining component methods that start with _ or $."
-        );
-      }
-    }
-    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
-  }
+function remove$1 (event, fn) {
+  target.$off(event, fn);
 }
 
-function initWatch (vm, watch) {
-  for (var key in watch) {
-    var handler = watch[key];
-    if (Array.isArray(handler)) {
-      for (var i = 0; i < handler.length; i++) {
-        createWatcher(vm, key, handler[i]);
-      }
-    } else {
-      createWatcher(vm, key, handler);
+function createOnceHandler (event, fn) {
+  var _target = target;
+  return function onceHandler () {
+    var res = fn.apply(null, arguments);
+    if (res !== null) {
+      _target.$off(event, onceHandler);
     }
   }
 }
 
-function createWatcher (
+function updateComponentListeners (
   vm,
-  expOrFn,
-  handler,
-  options
+  listeners,
+  oldListeners
 ) {
-  if (isPlainObject(handler)) {
-    options = handler;
-    handler = handler.handler;
-  }
-  if (typeof handler === 'string') {
-    handler = vm[handler];
-  }
-  return vm.$watch(expOrFn, handler, options)
+  target = vm;
+  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+  target = undefined;
 }
 
-function stateMixin (Vue) {
-  // flow somehow has problems with directly declared definition object
-  // when using Object.defineProperty, so we have to procedurally build up
-  // the object here.
-  var dataDef = {};
-  dataDef.get = function () { return this._data };
-  var propsDef = {};
-  propsDef.get = function () { return this._props };
-  {
-    dataDef.set = function () {
-      warn(
-        'Avoid replacing instance root $data. ' +
-        'Use nested data properties instead.',
-        this
-      );
-    };
-    propsDef.set = function () {
-      warn("$props is readonly.", this);
-    };
-  }
-  Object.defineProperty(Vue.prototype, '$data', dataDef);
-  Object.defineProperty(Vue.prototype, '$props', propsDef);
+function eventsMixin (Vue) {
+  var hookRE = /^hook:/;
+  Vue.prototype.$on = function (event, fn) {
+    var vm = this;
+    if (Array.isArray(event)) {
+      for (var i = 0, l = event.length; i < l; i++) {
+        vm.$on(event[i], fn);
+      }
+    } else {
+      (vm._events[event] || (vm._events[event] = [])).push(fn);
+      // optimize hook:event cost by using a boolean flag marked at registration
+      // instead of a hash lookup
+      if (hookRE.test(event)) {
+        vm._hasHookEvent = true;
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$set = set;
-  Vue.prototype.$delete = del;
+  Vue.prototype.$once = function (event, fn) {
+    var vm = this;
+    function on () {
+      vm.$off(event, on);
+      fn.apply(vm, arguments);
+    }
+    on.fn = fn;
+    vm.$on(event, on);
+    return vm
+  };
+
+  Vue.prototype.$off = function (event, fn) {
+    var vm = this;
+    // all
+    if (!arguments.length) {
+      vm._events = Object.create(null);
+      return vm
+    }
+    // array of events
+    if (Array.isArray(event)) {
+      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
+        vm.$off(event[i$1], fn);
+      }
+      return vm
+    }
+    // specific event
+    var cbs = vm._events[event];
+    if (!cbs) {
+      return vm
+    }
+    if (!fn) {
+      vm._events[event] = null;
+      return vm
+    }
+    // specific handler
+    var cb;
+    var i = cbs.length;
+    while (i--) {
+      cb = cbs[i];
+      if (cb === fn || cb.fn === fn) {
+        cbs.splice(i, 1);
+        break
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$watch = function (
-    expOrFn,
-    cb,
-    options
-  ) {
+  Vue.prototype.$emit = function (event) {
     var vm = this;
-    if (isPlainObject(cb)) {
-      return createWatcher(vm, expOrFn, cb, options)
-    }
-    options = options || {};
-    options.user = true;
-    var watcher = new Watcher(vm, expOrFn, cb, options);
-    if (options.immediate) {
-      try {
-        cb.call(vm, watcher.value);
-      } catch (error) {
-        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
+    {
+      var lowerCaseEvent = event.toLowerCase();
+      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+        tip(
+          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
+          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
+          "Note that HTML attributes are case-insensitive and you cannot use " +
+          "v-on to listen to camelCase events when using in-DOM templates. " +
+          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
+        );
       }
     }
-    return function unwatchFn () {
-      watcher.teardown();
+    var cbs = vm._events[event];
+    if (cbs) {
+      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+      var args = toArray(arguments, 1);
+      var info = "event handler for \"" + event + "\"";
+      for (var i = 0, l = cbs.length; i < l; i++) {
+        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+      }
     }
+    return vm
   };
 }
 
 /*  */
 
-function initProvide (vm) {
-  var provide = vm.$options.provide;
-  if (provide) {
-    vm._provided = typeof provide === 'function'
-      ? provide.call(vm)
-      : provide;
-  }
-}
+var activeInstance = null;
+var isUpdatingChildComponent = false;
 
-function initInjections (vm) {
-  var result = resolveInject(vm.$options.inject, vm);
-  if (result) {
-    toggleObserving(false);
-    Object.keys(result).forEach(function (key) {
-      /* istanbul ignore else */
-      {
-        defineReactive$$1(vm, key, result[key], function () {
-          warn(
-            "Avoid mutating an injected value directly since the changes will be " +
-            "overwritten whenever the provided component re-renders. " +
-            "injection being mutated: \"" + key + "\"",
-            vm
-          );
-        });
-      }
-    });
-    toggleObserving(true);
+function setActiveInstance(vm) {
+  var prevActiveInstance = activeInstance;
+  activeInstance = vm;
+  return function () {
+    activeInstance = prevActiveInstance;
   }
 }
 
-function resolveInject (inject, vm) {
-  if (inject) {
-    // inject is :any because flow is not smart enough to figure out cached
-    var result = Object.create(null);
-    var keys = hasSymbol
-      ? Reflect.ownKeys(inject)
-      : Object.keys(inject);
+function initLifecycle (vm) {
+  var options = vm.$options;
 
-    for (var i = 0; i < keys.length; i++) {
-      var key = keys[i];
-      // #6574 in case the inject object is observed...
-      if (key === '__ob__') { continue }
-      var provideKey = inject[key].from;
-      var source = vm;
-      while (source) {
-        if (source._provided && hasOwn(source._provided, provideKey)) {
-          result[key] = source._provided[provideKey];
-          break
-        }
-        source = source.$parent;
-      }
-      if (!source) {
-        if ('default' in inject[key]) {
-          var provideDefault = inject[key].default;
-          result[key] = typeof provideDefault === 'function'
-            ? provideDefault.call(vm)
-            : provideDefault;
-        } else {
-          warn(("Injection \"" + key + "\" not found"), vm);
-        }
-      }
+  // locate first non-abstract parent
+  var parent = options.parent;
+  if (parent && !options.abstract) {
+    while (parent.$options.abstract && parent.$parent) {
+      parent = parent.$parent;
     }
-    return result
+    parent.$children.push(vm);
   }
-}
-
-/*  */
 
-function normalizeScopedSlots (
-  slots,
-  normalSlots
-) {
-  var res;
-  if (!slots) {
-    res = {};
-  } else if (slots._normalized) {
-    return slots
-  } else {
-    res = {};
-    for (var key in slots) {
-      if (slots[key] && key[0] !== '$') {
-        res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-      }
-    }
-  }
-  // expose normal slots on scopedSlots
-  for (var key$1 in normalSlots) {
-    if (!(key$1 in res)) {
-      res[key$1] = proxyNormalSlot(normalSlots, key$1);
-    }
-  }
-  res._normalized = true;
-  res.$stable = slots ? slots.$stable : true;
-  return res
-}
+  vm.$parent = parent;
+  vm.$root = parent ? parent.$root : vm;
 
-function normalizeScopedSlot(normalSlots, key, fn) {
-  var normalized = function (scope) {
-    if ( scope === void 0 ) scope = {};
+  vm.$children = [];
+  vm.$refs = {};
 
-    var res = fn(scope);
-    return res && typeof res === 'object' && !Array.isArray(res)
-      ? [res] // single vnode
-      : normalizeChildren(res)
-  };
-  // proxy scoped slots on normal $slots
-  if (!hasOwn(normalSlots, key)) {
-    Object.defineProperty(normalSlots, key, {
-      get: normalized
-    });
-  }
-  return normalized
+  vm._watcher = null;
+  vm._inactive = null;
+  vm._directInactive = false;
+  vm._isMounted = false;
+  vm._isDestroyed = false;
+  vm._isBeingDestroyed = false;
 }
 
-function proxyNormalSlot(slots, key) {
-  return function () { return slots[key]; }
-}
+function lifecycleMixin (Vue) {
+  Vue.prototype._update = function (vnode, hydrating) {
+    var vm = this;
+    var prevEl = vm.$el;
+    var prevVnode = vm._vnode;
+    var restoreActiveInstance = setActiveInstance(vm);
+    vm._vnode = vnode;
+    // Vue.prototype.__patch__ is injected in entry points
+    // based on the rendering backend used.
+    if (!prevVnode) {
+      // initial render
+      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+    } else {
+      // updates
+      vm.$el = vm.__patch__(prevVnode, vnode);
+    }
+    restoreActiveInstance();
+    // update __vue__ reference
+    if (prevEl) {
+      prevEl.__vue__ = null;
+    }
+    if (vm.$el) {
+      vm.$el.__vue__ = vm;
+    }
+    // if parent is an HOC, update its $el as well
+    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+      vm.$parent.$el = vm.$el;
+    }
+    // updated hook is called by the scheduler to ensure that children are
+    // updated in a parent's updated hook.
+  };
 
-/*  */
+  Vue.prototype.$forceUpdate = function () {
+    var vm = this;
+    if (vm._watcher) {
+      vm._watcher.update();
+    }
+  };
 
-/**
- * Runtime helper for rendering v-for lists.
- */
-function renderList (
-  val,
-  render
-) {
-  var ret, i, l, keys, key;
-  if (Array.isArray(val) || typeof val === 'string') {
-    ret = new Array(val.length);
-    for (i = 0, l = val.length; i < l; i++) {
-      ret[i] = render(val[i], i);
+  Vue.prototype.$destroy = function () {
+    var vm = this;
+    if (vm._isBeingDestroyed) {
+      return
     }
-  } else if (typeof val === 'number') {
-    ret = new Array(val);
-    for (i = 0; i < val; i++) {
-      ret[i] = render(i + 1, i);
+    callHook(vm, 'beforeDestroy');
+    vm._isBeingDestroyed = true;
+    // remove self from parent
+    var parent = vm.$parent;
+    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+      remove(parent.$children, vm);
+    }
+    // teardown watchers
+    if (vm._watcher) {
+      vm._watcher.teardown();
+    }
+    var i = vm._watchers.length;
+    while (i--) {
+      vm._watchers[i].teardown();
+    }
+    // remove reference from data ob
+    // frozen object may not have observer.
+    if (vm._data.__ob__) {
+      vm._data.__ob__.vmCount--;
+    }
+    // call the last hook...
+    vm._isDestroyed = true;
+    // invoke destroy hooks on current rendered tree
+    vm.__patch__(vm._vnode, null);
+    // fire destroyed hook
+    callHook(vm, 'destroyed');
+    // turn off all instance listeners.
+    vm.$off();
+    // remove __vue__ reference
+    if (vm.$el) {
+      vm.$el.__vue__ = null;
     }
-  } else if (isObject(val)) {
-    if (hasSymbol && val[Symbol.iterator]) {
-      ret = [];
-      var iterator = val[Symbol.iterator]();
-      var result = iterator.next();
-      while (!result.done) {
-        ret.push(render(result.value, ret.length));
-        result = iterator.next();
-      }
-    } else {
-      keys = Object.keys(val);
-      ret = new Array(keys.length);
-      for (i = 0, l = keys.length; i < l; i++) {
-        key = keys[i];
-        ret[i] = render(val[key], key, i);
-      }
+    // release circular reference (#6759)
+    if (vm.$vnode) {
+      vm.$vnode.parent = null;
     }
-  }
-  if (!isDef(ret)) {
-    ret = [];
-  }
-  (ret)._isVList = true;
-  return ret
+  };
 }
 
-/*  */
-
-/**
- * Runtime helper for rendering <slot>
- */
-function renderSlot (
-  name,
-  fallback,
-  props,
-  bindObject
+function mountComponent (
+  vm,
+  el,
+  hydrating
 ) {
-  var scopedSlotFn = this.$scopedSlots[name];
-  var nodes;
-  if (scopedSlotFn) { // scoped slot
-    props = props || {};
-    if (bindObject) {
-      if (!isObject(bindObject)) {
+  vm.$el = el;
+  if (!vm.$options.render) {
+    vm.$options.render = createEmptyVNode;
+    {
+      /* istanbul ignore if */
+      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+        vm.$options.el || el) {
         warn(
-          'slot v-bind without argument expects an Object',
-          this
+          'You are using the runtime-only build of Vue where the template ' +
+          'compiler is not available. Either pre-compile the templates into ' +
+          'render functions, or use the compiler-included build.',
+          vm
+        );
+      } else {
+        warn(
+          'Failed to mount component: template or render function not defined.',
+          vm
         );
       }
-      props = extend(extend({}, bindObject), props);
     }
-    nodes = scopedSlotFn(props) || fallback;
-  } else {
-    nodes = this.$slots[name] || fallback;
   }
+  callHook(vm, 'beforeMount');
 
-  var target = props && props.slot;
-  if (target) {
-    return this.$createElement('template', { slot: target }, nodes)
-  } else {
-    return nodes
-  }
-}
+  var updateComponent;
+  /* istanbul ignore if */
+  if (config.performance && mark) {
+    updateComponent = function () {
+      var name = vm._name;
+      var id = vm._uid;
+      var startTag = "vue-perf-start:" + id;
+      var endTag = "vue-perf-end:" + id;
 
-/*  */
+      mark(startTag);
+      var vnode = vm._render();
+      mark(endTag);
+      measure(("vue " + name + " render"), startTag, endTag);
 
-/**
- * Runtime helper for resolving filters
- */
-function resolveFilter (id) {
-  return resolveAsset(this.$options, 'filters', id, true) || identity
-}
+      mark(startTag);
+      vm._update(vnode, hydrating);
+      mark(endTag);
+      measure(("vue " + name + " patch"), startTag, endTag);
+    };
+  } else {
+    updateComponent = function () {
+      vm._update(vm._render(), hydrating);
+    };
+  }
 
-/*  */
+  // we set this to vm._watcher inside the watcher's constructor
+  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+  // component's mounted hook), which relies on vm._watcher being already defined
+  new Watcher(vm, updateComponent, noop, {
+    before: function before () {
+      if (vm._isMounted && !vm._isDestroyed) {
+        callHook(vm, 'beforeUpdate');
+      }
+    }
+  }, true /* isRenderWatcher */);
+  hydrating = false;
 
-function isKeyNotMatch (expect, actual) {
-  if (Array.isArray(expect)) {
-    return expect.indexOf(actual) === -1
-  } else {
-    return expect !== actual
+  // manually mounted instance, call mounted on self
+  // mounted is called for render-created child components in its inserted hook
+  if (vm.$vnode == null) {
+    vm._isMounted = true;
+    callHook(vm, 'mounted');
   }
+  return vm
 }
 
-/**
- * Runtime helper for checking keyCodes from config.
- * exposed as Vue.prototype._k
- * passing in eventKeyName as last argument separately for backwards compat
- */
-function checkKeyCodes (
-  eventKeyCode,
-  key,
-  builtInKeyCode,
-  eventKeyName,
-  builtInKeyName
+function updateChildComponent (
+  vm,
+  propsData,
+  listeners,
+  parentVnode,
+  renderChildren
 ) {
-  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-    return isKeyNotMatch(builtInKeyName, eventKeyName)
-  } else if (mappedKeyCode) {
-    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-  } else if (eventKeyName) {
-    return hyphenate(eventKeyName) !== key
+  {
+    isUpdatingChildComponent = true;
   }
-}
 
-/*  */
+  // determine whether component has slot children
+  // we need to do this before overwriting $options._renderChildren.
 
-/**
- * Runtime helper for merging v-bind="object" into a VNode's data.
- */
-function bindObjectProps (
-  data,
-  tag,
-  value,
-  asProp,
-  isSync
-) {
-  if (value) {
-    if (!isObject(value)) {
-      warn(
-        'v-bind without argument expects an Object or Array value',
-        this
-      );
-    } else {
-      if (Array.isArray(value)) {
-        value = toObject(value);
-      }
-      var hash;
-      var loop = function ( key ) {
-        if (
-          key === 'class' ||
-          key === 'style' ||
-          isReservedAttribute(key)
-        ) {
-          hash = data;
-        } else {
-          var type = data.attrs && data.attrs.type;
-          hash = asProp || config.mustUseProp(tag, type, key)
-            ? data.domProps || (data.domProps = {})
-            : data.attrs || (data.attrs = {});
-        }
-        var camelizedKey = camelize(key);
-        if (!(key in hash) && !(camelizedKey in hash)) {
-          hash[key] = value[key];
+  // check if there are dynamic scopedSlots (hand-written or compiled but with
+  // dynamic slot names). Static scoped slots compiled from template has the
+  // "$stable" marker.
+  var hasDynamicScopedSlot = !!(
+    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+  );
 
-          if (isSync) {
-            var on = data.on || (data.on = {});
-            on[("update:" + camelizedKey)] = function ($event) {
-              value[key] = $event;
-            };
-          }
-        }
-      };
+  // Any static slot children from the parent may have changed during parent's
+  // update. Dynamic scoped slots may also have changed. In such cases, a forced
+  // update is necessary to ensure correctness.
+  var needsForceUpdate = !!(
+    renderChildren ||               // has new static slots
+    vm.$options._renderChildren ||  // has old static slots
+    hasDynamicScopedSlot
+  );
+
+  vm.$options._parentVnode = parentVnode;
+  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+
+  if (vm._vnode) { // update child tree's parent
+    vm._vnode.parent = parentVnode;
+  }
+  vm.$options._renderChildren = renderChildren;
+
+  // update $attrs and $listeners hash
+  // these are also reactive so they may trigger child update if the child
+  // used them during render
+  vm.$attrs = parentVnode.data.attrs || emptyObject;
+  vm.$listeners = listeners || emptyObject;
+
+  // update props
+  if (propsData && vm.$options.props) {
+    toggleObserving(false);
+    var props = vm._props;
+    var propKeys = vm.$options._propKeys || [];
+    for (var i = 0; i < propKeys.length; i++) {
+      var key = propKeys[i];
+      var propOptions = vm.$options.props; // wtf flow?
+      props[key] = validateProp(key, propOptions, propsData, vm);
+    }
+    toggleObserving(true);
+    // keep a copy of raw propsData
+    vm.$options.propsData = propsData;
+  }
+
+  // update listeners
+  listeners = listeners || emptyObject;
+  var oldListeners = vm.$options._parentListeners;
+  vm.$options._parentListeners = listeners;
+  updateComponentListeners(vm, listeners, oldListeners);
 
-      for (var key in value) loop( key );
-    }
+  // resolve slots + force update if has children
+  if (needsForceUpdate) {
+    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+    vm.$forceUpdate();
   }
-  return data
-}
-
-/*  */
 
-/**
- * Runtime helper for rendering static trees.
- */
-function renderStatic (
-  index,
-  isInFor
-) {
-  var cached = this._staticTrees || (this._staticTrees = []);
-  var tree = cached[index];
-  // if has already-rendered static tree and not inside v-for,
-  // we can reuse the same tree.
-  if (tree && !isInFor) {
-    return tree
+  {
+    isUpdatingChildComponent = false;
   }
-  // otherwise, render a fresh tree.
-  tree = cached[index] = this.$options.staticRenderFns[index].call(
-    this._renderProxy,
-    null,
-    this // for render fns generated for functional component templates
-  );
-  markStatic(tree, ("__static__" + index), false);
-  return tree
 }
 
-/**
- * Runtime helper for v-once.
- * Effectively it means marking the node as static with a unique key.
- */
-function markOnce (
-  tree,
-  index,
-  key
-) {
-  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-  return tree
+function isInInactiveTree (vm) {
+  while (vm && (vm = vm.$parent)) {
+    if (vm._inactive) { return true }
+  }
+  return false
 }
 
-function markStatic (
-  tree,
-  key,
-  isOnce
-) {
-  if (Array.isArray(tree)) {
-    for (var i = 0; i < tree.length; i++) {
-      if (tree[i] && typeof tree[i] !== 'string') {
-        markStaticNode(tree[i], (key + "_" + i), isOnce);
-      }
+function activateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = false;
+    if (isInInactiveTree(vm)) {
+      return
     }
-  } else {
-    markStaticNode(tree, key, isOnce);
+  } else if (vm._directInactive) {
+    return
   }
-}
-
-function markStaticNode (node, key, isOnce) {
-  node.isStatic = true;
-  node.key = key;
-  node.isOnce = isOnce;
-}
-
-/*  */
-
-function bindObjectListeners (data, value) {
-  if (value) {
-    if (!isPlainObject(value)) {
-      warn(
-        'v-on without argument expects an Object value',
-        this
-      );
-    } else {
-      var on = data.on = data.on ? extend({}, data.on) : {};
-      for (var key in value) {
-        var existing = on[key];
-        var ours = value[key];
-        on[key] = existing ? [].concat(existing, ours) : ours;
-      }
+  if (vm._inactive || vm._inactive === null) {
+    vm._inactive = false;
+    for (var i = 0; i < vm.$children.length; i++) {
+      activateChildComponent(vm.$children[i]);
     }
+    callHook(vm, 'activated');
   }
-  return data
 }
 
-/*  */
-
-function bindDynamicKeys (baseObj, values) {
-  for (var i = 0; i < values.length; i += 2) {
-    var key = values[i];
-    if (typeof key === 'string' && key) {
-      baseObj[values[i]] = values[i + 1];
-    } else if (key !== '' && key !== null) {
-      // null is a speical value for explicitly removing a binding
-      warn(
-        ("Invalid value for dynamic directive argument (expected string or null): " + key),
-        this
-      );
+function deactivateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = true;
+    if (isInInactiveTree(vm)) {
+      return
     }
   }
-  return baseObj
+  if (!vm._inactive) {
+    vm._inactive = true;
+    for (var i = 0; i < vm.$children.length; i++) {
+      deactivateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'deactivated');
+  }
 }
 
-// helper to dynamically append modifier runtime markers to event names.
-// ensure only append when value is already string, otherwise it will be cast
-// to string and cause the type check to miss.
-function prependModifier (value, symbol) {
-  return typeof value === 'string' ? symbol + value : value
+function callHook (vm, hook) {
+  // #7573 disable dep collection when invoking lifecycle hooks
+  pushTarget();
+  var handlers = vm.$options[hook];
+  var info = hook + " hook";
+  if (handlers) {
+    for (var i = 0, j = handlers.length; i < j; i++) {
+      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+    }
+  }
+  if (vm._hasHookEvent) {
+    vm.$emit('hook:' + hook);
+  }
+  popTarget();
 }
 
 /*  */
 
-function installRenderHelpers (target) {
-  target._o = markOnce;
-  target._n = toNumber;
-  target._s = toString;
-  target._l = renderList;
-  target._t = renderSlot;
-  target._q = looseEqual;
-  target._i = looseIndexOf;
-  target._m = renderStatic;
-  target._f = resolveFilter;
-  target._k = checkKeyCodes;
-  target._b = bindObjectProps;
-  target._v = createTextVNode;
-  target._e = createEmptyVNode;
-  target._u = resolveScopedSlots;
-  target._g = bindObjectListeners;
-  target._d = bindDynamicKeys;
-  target._p = prependModifier;
-}
+var MAX_UPDATE_COUNT = 100;
 
-/*  */
+var queue = [];
+var activatedChildren = [];
+var has = {};
+var circular = {};
+var waiting = false;
+var flushing = false;
+var index = 0;
 
-function FunctionalRenderContext (
-  data,
-  props,
-  children,
-  parent,
-  Ctor
-) {
-  var options = Ctor.options;
-  // ensure the createElement function in functional components
-  // gets a unique context - this is necessary for correct named slot check
-  var contextVm;
-  if (hasOwn(parent, '_uid')) {
-    contextVm = Object.create(parent);
-    // $flow-disable-line
-    contextVm._original = parent;
-  } else {
-    // the context vm passed in is a functional context as well.
-    // in this case we want to make sure we are able to get a hold to the
-    // real context instance.
-    contextVm = parent;
-    // $flow-disable-line
-    parent = parent._original;
+/**
+ * Reset the scheduler's state.
+ */
+function resetSchedulerState () {
+  index = queue.length = activatedChildren.length = 0;
+  has = {};
+  {
+    circular = {};
   }
-  var isCompiled = isTrue(options._compiled);
-  var needNormalization = !isCompiled;
-
-  this.data = data;
-  this.props = props;
-  this.children = children;
-  this.parent = parent;
-  this.listeners = data.on || emptyObject;
-  this.injections = resolveInject(options.inject, parent);
-  this.slots = function () { return resolveSlots(children, parent); };
+  waiting = flushing = false;
+}
 
-  Object.defineProperty(this, 'scopedSlots', ({
-    enumerable: true,
-    get: function get () {
-      return normalizeScopedSlots(data.scopedSlots, this.slots())
-    }
-  }));
+// Async edge case #6566 requires saving the timestamp when event listeners are
+// attached. However, calling performance.now() has a perf overhead especially
+// if the page has thousands of event listeners. Instead, we take a timestamp
+// every time the scheduler flushes and use that for all event listeners
+// attached during that flush.
+var currentFlushTimestamp = 0;
 
-  // support for compiled functional template
-  if (isCompiled) {
-    // exposing $options for renderStatic()
-    this.$options = options;
-    // pre-resolve slots for renderSlot()
-    this.$slots = this.slots();
-    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
-  }
+// Async edge case fix requires storing an event listener's attach timestamp.
+var getNow = Date.now;
 
-  if (options._scopeId) {
-    this._c = function (a, b, c, d) {
-      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
-      if (vnode && !Array.isArray(vnode)) {
-        vnode.fnScopeId = options._scopeId;
-        vnode.fnContext = parent;
-      }
-      return vnode
-    };
-  } else {
-    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
-  }
+// Determine what event timestamp the browser is using. Annoyingly, the
+// timestamp can either be hi-res (relative to page load) or low-res
+// (relative to UNIX epoch), so in order to compare time we have to use the
+// same timestamp type when saving the flush timestamp.
+if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+  // if the low-res timestamp which is bigger than the event timestamp
+  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+  // and we need to use the hi-res version for event listeners as well.
+  getNow = function () { return performance.now(); };
 }
 
-installRenderHelpers(FunctionalRenderContext.prototype);
+/**
+ * Flush both queues and run the watchers.
+ */
+function flushSchedulerQueue () {
+  currentFlushTimestamp = getNow();
+  flushing = true;
+  var watcher, id;
 
-function createFunctionalComponent (
-  Ctor,
-  propsData,
-  data,
-  contextVm,
-  children
-) {
-  var options = Ctor.options;
-  var props = {};
-  var propOptions = options.props;
-  if (isDef(propOptions)) {
-    for (var key in propOptions) {
-      props[key] = validateProp(key, propOptions, propsData || emptyObject);
+  // Sort queue before flush.
+  // This ensures that:
+  // 1. Components are updated from parent to child. (because parent is always
+  //    created before the child)
+  // 2. A component's user watchers are run before its render watcher (because
+  //    user watchers are created before the render watcher)
+  // 3. If a component is destroyed during a parent component's watcher run,
+  //    its watchers can be skipped.
+  queue.sort(function (a, b) { return a.id - b.id; });
+
+  // do not cache length because more watchers might be pushed
+  // as we run existing watchers
+  for (index = 0; index < queue.length; index++) {
+    watcher = queue[index];
+    if (watcher.before) {
+      watcher.before();
+    }
+    id = watcher.id;
+    has[id] = null;
+    watcher.run();
+    // in dev build, check and stop circular updates.
+    if (has[id] != null) {
+      circular[id] = (circular[id] || 0) + 1;
+      if (circular[id] > MAX_UPDATE_COUNT) {
+        warn(
+          'You may have an infinite update loop ' + (
+            watcher.user
+              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
+              : "in a component render function."
+          ),
+          watcher.vm
+        );
+        break
+      }
     }
-  } else {
-    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
-    if (isDef(data.props)) { mergeProps(props, data.props); }
   }
 
-  var renderContext = new FunctionalRenderContext(
-    data,
-    props,
-    children,
-    contextVm,
-    Ctor
-  );
+  // keep copies of post queues before resetting state
+  var activatedQueue = activatedChildren.slice();
+  var updatedQueue = queue.slice();
 
-  var vnode = options.render.call(null, renderContext._c, renderContext);
+  resetSchedulerState();
 
-  if (vnode instanceof VNode) {
-    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
-  } else if (Array.isArray(vnode)) {
-    var vnodes = normalizeChildren(vnode) || [];
-    var res = new Array(vnodes.length);
-    for (var i = 0; i < vnodes.length; i++) {
-      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
-    }
-    return res
+  // call component updated and activated hooks
+  callActivatedHooks(activatedQueue);
+  callUpdatedHooks(updatedQueue);
+
+  // devtool hook
+  /* istanbul ignore if */
+  if (devtools && config.devtools) {
+    devtools.emit('flush');
   }
 }
 
-function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
-  // #7817 clone node before setting fnContext, otherwise if the node is reused
-  // (e.g. it was from a cached normal slot) the fnContext causes named slots
-  // that should not be matched to match.
-  var clone = cloneVNode(vnode);
-  clone.fnContext = contextVm;
-  clone.fnOptions = options;
-  {
-    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
-  }
-  if (data.slot) {
-    (clone.data || (clone.data = {})).slot = data.slot;
+function callUpdatedHooks (queue) {
+  var i = queue.length;
+  while (i--) {
+    var watcher = queue[i];
+    var vm = watcher.vm;
+    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+      callHook(vm, 'updated');
+    }
   }
-  return clone
 }
 
-function mergeProps (to, from) {
-  for (var key in from) {
-    to[camelize(key)] = from[key];
-  }
+/**
+ * Queue a kept-alive component that was activated during patch.
+ * The queue will be processed after the entire tree has been patched.
+ */
+function queueActivatedComponent (vm) {
+  // setting _inactive to false here so that a render function can
+  // rely on checking whether it's in an inactive tree (e.g. router-view)
+  vm._inactive = false;
+  activatedChildren.push(vm);
 }
 
-/*  */
+function callActivatedHooks (queue) {
+  for (var i = 0; i < queue.length; i++) {
+    queue[i]._inactive = true;
+    activateChildComponent(queue[i], true /* true */);
+  }
+}
 
-/*  */
+/**
+ * Push a watcher into the watcher queue.
+ * Jobs with duplicate IDs will be skipped unless it's
+ * pushed when the queue is being flushed.
+ */
+function queueWatcher (watcher) {
+  var id = watcher.id;
+  if (has[id] == null) {
+    has[id] = true;
+    if (!flushing) {
+      queue.push(watcher);
+    } else {
+      // if already flushing, splice the watcher based on its id
+      // if already past its id, it will be run next immediately.
+      var i = queue.length - 1;
+      while (i > index && queue[i].id > watcher.id) {
+        i--;
+      }
+      queue.splice(i + 1, 0, watcher);
+    }
+    // queue the flush
+    if (!waiting) {
+      waiting = true;
 
-/*  */
+      if (!config.async) {
+        flushSchedulerQueue();
+        return
+      }
+      nextTick(flushSchedulerQueue);
+    }
+  }
+}
 
 /*  */
 
-// inline hooks to be invoked on component VNodes during patch
-var componentVNodeHooks = {
-  init: function init (vnode, hydrating) {
-    if (
-      vnode.componentInstance &&
-      !vnode.componentInstance._isDestroyed &&
-      vnode.data.keepAlive
-    ) {
-      // kept-alive components, treat as a patch
-      var mountedNode = vnode; // work around flow
-      componentVNodeHooks.prepatch(mountedNode, mountedNode);
-    } else {
-      var child = vnode.componentInstance = createComponentInstanceForVnode(
-        vnode,
-        activeInstance
-      );
-      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
-    }
-  },
 
-  prepatch: function prepatch (oldVnode, vnode) {
-    var options = vnode.componentOptions;
-    var child = vnode.componentInstance = oldVnode.componentInstance;
-    updateChildComponent(
-      child,
-      options.propsData, // updated props
-      options.listeners, // updated listeners
-      vnode, // new parent vnode
-      options.children // new children
-    );
-  },
 
-  insert: function insert (vnode) {
-    var context = vnode.context;
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isMounted) {
-      componentInstance._isMounted = true;
-      callHook(componentInstance, 'mounted');
-    }
-    if (vnode.data.keepAlive) {
-      if (context._isMounted) {
-        // vue-router#1212
-        // During updates, a kept-alive component's child components may
-        // change, so directly walking the tree here may call activated hooks
-        // on incorrect children. Instead we push them into a queue which will
-        // be processed after the whole patch process ended.
-        queueActivatedComponent(componentInstance);
-      } else {
-        activateChildComponent(componentInstance, true /* direct */);
-      }
-    }
-  },
+var uid$2 = 0;
 
-  destroy: function destroy (vnode) {
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isDestroyed) {
-      if (!vnode.data.keepAlive) {
-        componentInstance.$destroy();
-      } else {
-        deactivateChildComponent(componentInstance, true /* direct */);
-      }
+/**
+ * A watcher parses an expression, collects dependencies,
+ * and fires callback when the expression value changes.
+ * This is used for both the $watch() api and directives.
+ */
+var Watcher = function Watcher (
+  vm,
+  expOrFn,
+  cb,
+  options,
+  isRenderWatcher
+) {
+  this.vm = vm;
+  if (isRenderWatcher) {
+    vm._watcher = this;
+  }
+  vm._watchers.push(this);
+  // options
+  if (options) {
+    this.deep = !!options.deep;
+    this.user = !!options.user;
+    this.lazy = !!options.lazy;
+    this.sync = !!options.sync;
+    this.before = options.before;
+  } else {
+    this.deep = this.user = this.lazy = this.sync = false;
+  }
+  this.cb = cb;
+  this.id = ++uid$2; // uid for batching
+  this.active = true;
+  this.dirty = this.lazy; // for lazy watchers
+  this.deps = [];
+  this.newDeps = [];
+  this.depIds = new _Set();
+  this.newDepIds = new _Set();
+  this.expression = expOrFn.toString();
+  // parse expression for getter
+  if (typeof expOrFn === 'function') {
+    this.getter = expOrFn;
+  } else {
+    this.getter = parsePath(expOrFn);
+    if (!this.getter) {
+      this.getter = noop;
+      warn(
+        "Failed watching path: \"" + expOrFn + "\" " +
+        'Watcher only accepts simple dot-delimited paths. ' +
+        'For full control, use a function instead.',
+        vm
+      );
     }
   }
+  this.value = this.lazy
+    ? undefined
+    : this.get();
 };
 
-var hooksToMerge = Object.keys(componentVNodeHooks);
-
-function createComponent (
-  Ctor,
-  data,
-  context,
-  children,
-  tag
-) {
-  if (isUndef(Ctor)) {
-    return
-  }
-
-  var baseCtor = context.$options._base;
-
-  // plain options object: turn it into a constructor
-  if (isObject(Ctor)) {
-    Ctor = baseCtor.extend(Ctor);
-  }
-
-  // if at this stage it's not a constructor or an async component factory,
-  // reject.
-  if (typeof Ctor !== 'function') {
-    {
-      warn(("Invalid Component definition: " + (String(Ctor))), context);
+/**
+ * Evaluate the getter, and re-collect dependencies.
+ */
+Watcher.prototype.get = function get () {
+  pushTarget(this);
+  var value;
+  var vm = this.vm;
+  try {
+    value = this.getter.call(vm, vm);
+  } catch (e) {
+    if (this.user) {
+      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+    } else {
+      throw e
     }
-    return
+  } finally {
+    // "touch" every property so they are all tracked as
+    // dependencies for deep watching
+    if (this.deep) {
+      traverse(value);
+    }
+    popTarget();
+    this.cleanupDeps();
   }
+  return value
+};
 
-  // async component
-  var asyncFactory;
-  if (isUndef(Ctor.cid)) {
-    asyncFactory = Ctor;
-    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
-    if (Ctor === undefined) {
-      // return a placeholder node for async component, which is rendered
-      // as a comment node but preserves all the raw information for the node.
-      // the information will be used for async server-rendering and hydration.
-      return createAsyncPlaceholder(
-        asyncFactory,
-        data,
-        context,
-        children,
-        tag
-      )
+/**
+ * Add a dependency to this directive.
+ */
+Watcher.prototype.addDep = function addDep (dep) {
+  var id = dep.id;
+  if (!this.newDepIds.has(id)) {
+    this.newDepIds.add(id);
+    this.newDeps.push(dep);
+    if (!this.depIds.has(id)) {
+      dep.addSub(this);
     }
   }
+};
 
-  data = data || {};
-
-  // resolve constructor options in case global mixins are applied after
-  // component constructor creation
-  resolveConstructorOptions(Ctor);
-
-  // transform component v-model data into props & events
-  if (isDef(data.model)) {
-    transformModel(Ctor.options, data);
+/**
+ * Clean up for dependency collection.
+ */
+Watcher.prototype.cleanupDeps = function cleanupDeps () {
+  var i = this.deps.length;
+  while (i--) {
+    var dep = this.deps[i];
+    if (!this.newDepIds.has(dep.id)) {
+      dep.removeSub(this);
+    }
   }
+  var tmp = this.depIds;
+  this.depIds = this.newDepIds;
+  this.newDepIds = tmp;
+  this.newDepIds.clear();
+  tmp = this.deps;
+  this.deps = this.newDeps;
+  this.newDeps = tmp;
+  this.newDeps.length = 0;
+};
 
-  // extract props
-  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
-
-  // functional component
-  if (isTrue(Ctor.options.functional)) {
-    return createFunctionalComponent(Ctor, propsData, data, context, children)
+/**
+ * Subscriber interface.
+ * Will be called when a dependency changes.
+ */
+Watcher.prototype.update = function update () {
+  /* istanbul ignore else */
+  if (this.lazy) {
+    this.dirty = true;
+  } else if (this.sync) {
+    this.run();
+  } else {
+    queueWatcher(this);
   }
+};
 
-  // extract listeners, since these needs to be treated as
-  // child component listeners instead of DOM listeners
-  var listeners = data.on;
-  // replace with listeners with .native modifier
-  // so it gets processed during parent component patch.
-  data.on = data.nativeOn;
-
-  if (isTrue(Ctor.options.abstract)) {
-    // abstract components do not keep anything
-    // other than props & listeners & slot
-
-    // work around flow
-    var slot = data.slot;
-    data = {};
-    if (slot) {
-      data.slot = slot;
+/**
+ * Scheduler job interface.
+ * Will be called by the scheduler.
+ */
+Watcher.prototype.run = function run () {
+  if (this.active) {
+    var value = this.get();
+    if (
+      value !== this.value ||
+      // Deep watchers and watchers on Object/Arrays should fire even
+      // when the value is the same, because the value may
+      // have mutated.
+      isObject(value) ||
+      this.deep
+    ) {
+      // set new value
+      var oldValue = this.value;
+      this.value = value;
+      if (this.user) {
+        try {
+          this.cb.call(this.vm, value, oldValue);
+        } catch (e) {
+          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
+        }
+      } else {
+        this.cb.call(this.vm, value, oldValue);
+      }
     }
   }
+};
 
-  // install component management hooks onto the placeholder node
-  installComponentHooks(data);
-
-  // return a placeholder vnode
-  var name = Ctor.options.name || tag;
-  var vnode = new VNode(
-    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
-    data, undefined, undefined, undefined, context,
-    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
-    asyncFactory
-  );
-
-  return vnode
-}
+/**
+ * Evaluate the value of the watcher.
+ * This only gets called for lazy watchers.
+ */
+Watcher.prototype.evaluate = function evaluate () {
+  this.value = this.get();
+  this.dirty = false;
+};
 
-function createComponentInstanceForVnode (
-  vnode, // we know it's MountedComponentVNode but flow doesn't
-  parent // activeInstance in lifecycle state
-) {
-  var options = {
-    _isComponent: true,
-    _parentVnode: vnode,
-    parent: parent
-  };
-  // check inline-template render functions
-  var inlineTemplate = vnode.data.inlineTemplate;
-  if (isDef(inlineTemplate)) {
-    options.render = inlineTemplate.render;
-    options.staticRenderFns = inlineTemplate.staticRenderFns;
+/**
+ * Depend on all deps collected by this watcher.
+ */
+Watcher.prototype.depend = function depend () {
+  var i = this.deps.length;
+  while (i--) {
+    this.deps[i].depend();
   }
-  return new vnode.componentOptions.Ctor(options)
-}
+};
 
-function installComponentHooks (data) {
-  var hooks = data.hook || (data.hook = {});
-  for (var i = 0; i < hooksToMerge.length; i++) {
-    var key = hooksToMerge[i];
-    var existing = hooks[key];
-    var toMerge = componentVNodeHooks[key];
-    if (existing !== toMerge && !(existing && existing._merged)) {
-      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
+/**
+ * Remove self from all dependencies' subscriber list.
+ */
+Watcher.prototype.teardown = function teardown () {
+  if (this.active) {
+    // remove self from vm's watcher list
+    // this is a somewhat expensive operation so we skip it
+    // if the vm is being destroyed.
+    if (!this.vm._isBeingDestroyed) {
+      remove(this.vm._watchers, this);
+    }
+    var i = this.deps.length;
+    while (i--) {
+      this.deps[i].removeSub(this);
     }
+    this.active = false;
   }
-}
+};
+
+/*  */
 
-function mergeHook$1 (f1, f2) {
-  var merged = function (a, b) {
-    // flow complains about extra args which is why we use any
-    f1(a, b);
-    f2(a, b);
+var sharedPropertyDefinition = {
+  enumerable: true,
+  configurable: true,
+  get: noop,
+  set: noop
+};
+
+function proxy (target, sourceKey, key) {
+  sharedPropertyDefinition.get = function proxyGetter () {
+    return this[sourceKey][key]
   };
-  merged._merged = true;
-  return merged
+  sharedPropertyDefinition.set = function proxySetter (val) {
+    this[sourceKey][key] = val;
+  };
+  Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
-// transform component v-model info (value and callback) into
-// prop and event handler respectively.
-function transformModel (options, data) {
-  var prop = (options.model && options.model.prop) || 'value';
-  var event = (options.model && options.model.event) || 'input'
-  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
-  var on = data.on || (data.on = {});
-  var existing = on[event];
-  var callback = data.model.callback;
-  if (isDef(existing)) {
-    if (
-      Array.isArray(existing)
-        ? existing.indexOf(callback) === -1
-        : existing !== callback
-    ) {
-      on[event] = [callback].concat(existing);
-    }
+function initState (vm) {
+  vm._watchers = [];
+  var opts = vm.$options;
+  if (opts.props) { initProps(vm, opts.props); }
+  if (opts.methods) { initMethods(vm, opts.methods); }
+  if (opts.data) {
+    initData(vm);
   } else {
-    on[event] = callback;
+    observe(vm._data = {}, true /* asRootData */);
+  }
+  if (opts.computed) { initComputed(vm, opts.computed); }
+  if (opts.watch && opts.watch !== nativeWatch) {
+    initWatch(vm, opts.watch);
   }
 }
 
-/*  */
-
-var SIMPLE_NORMALIZE = 1;
-var ALWAYS_NORMALIZE = 2;
-
-// wrapper function for providing a more flexible interface
-// without getting yelled at by flow
-function createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType,
-  alwaysNormalize
-) {
-  if (Array.isArray(data) || isPrimitive(data)) {
-    normalizationType = children;
-    children = data;
-    data = undefined;
-  }
-  if (isTrue(alwaysNormalize)) {
-    normalizationType = ALWAYS_NORMALIZE;
+function initProps (vm, propsOptions) {
+  var propsData = vm.$options.propsData || {};
+  var props = vm._props = {};
+  // cache prop keys so that future props updates can iterate using Array
+  // instead of dynamic object key enumeration.
+  var keys = vm.$options._propKeys = [];
+  var isRoot = !vm.$parent;
+  // root instance props should be converted
+  if (!isRoot) {
+    toggleObserving(false);
   }
-  return _createElement(context, tag, data, children, normalizationType)
+  var loop = function ( key ) {
+    keys.push(key);
+    var value = validateProp(key, propsOptions, propsData, vm);
+    /* istanbul ignore else */
+    {
+      var hyphenatedKey = hyphenate(key);
+      if (isReservedAttribute(hyphenatedKey) ||
+          config.isReservedAttr(hyphenatedKey)) {
+        warn(
+          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
+          vm
+        );
+      }
+      defineReactive$$1(props, key, value, function () {
+        if (!isRoot && !isUpdatingChildComponent) {
+          warn(
+            "Avoid mutating a prop directly since the value will be " +
+            "overwritten whenever the parent component re-renders. " +
+            "Instead, use a data or computed property based on the prop's " +
+            "value. Prop being mutated: \"" + key + "\"",
+            vm
+          );
+        }
+      });
+    }
+    // static props are already proxied on the component's prototype
+    // during Vue.extend(). We only need to proxy props defined at
+    // instantiation here.
+    if (!(key in vm)) {
+      proxy(vm, "_props", key);
+    }
+  };
+
+  for (var key in propsOptions) loop( key );
+  toggleObserving(true);
 }
 
-function _createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType
-) {
-  if (isDef(data) && isDef((data).__ob__)) {
+function initData (vm) {
+  var data = vm.$options.data;
+  data = vm._data = typeof data === 'function'
+    ? getData(data, vm)
+    : data || {};
+  if (!isPlainObject(data)) {
+    data = {};
     warn(
-      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-      'Always create fresh vnode data objects in each render!',
-      context
+      'data functions should return an object:\n' +
+      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+      vm
     );
-    return createEmptyVNode()
-  }
-  // object syntax in v-bind
-  if (isDef(data) && isDef(data.is)) {
-    tag = data.is;
-  }
-  if (!tag) {
-    // in case of component :is set to falsy value
-    return createEmptyVNode()
   }
-  // warn against non-primitive key
-  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-  ) {
+  // proxy data on instance
+  var keys = Object.keys(data);
+  var props = vm.$options.props;
+  var methods = vm.$options.methods;
+  var i = keys.length;
+  while (i--) {
+    var key = keys[i];
     {
+      if (methods && hasOwn(methods, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a data property."),
+          vm
+        );
+      }
+    }
+    if (props && hasOwn(props, key)) {
       warn(
-        'Avoid using non-primitive value as key, ' +
-        'use string/number value instead.',
-        context
+        "The data property \"" + key + "\" is already declared as a prop. " +
+        "Use prop default value instead.",
+        vm
       );
+    } else if (!isReserved(key)) {
+      proxy(vm, "_data", key);
     }
   }
-  // support single function children as default scoped slot
-  if (Array.isArray(children) &&
-    typeof children[0] === 'function'
-  ) {
-    data = data || {};
-    data.scopedSlots = { default: children[0] };
-    children.length = 0;
-  }
-  if (normalizationType === ALWAYS_NORMALIZE) {
-    children = normalizeChildren(children);
-  } else if (normalizationType === SIMPLE_NORMALIZE) {
-    children = simpleNormalizeChildren(children);
+  // observe data
+  observe(data, true /* asRootData */);
+}
+
+function getData (data, vm) {
+  // #7573 disable dep collection when invoking data getters
+  pushTarget();
+  try {
+    return data.call(vm, vm)
+  } catch (e) {
+    handleError(e, vm, "data()");
+    return {}
+  } finally {
+    popTarget();
   }
-  var vnode, ns;
-  if (typeof tag === 'string') {
-    var Ctor;
-    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-    if (config.isReservedTag(tag)) {
-      // platform built-in elements
-      vnode = new VNode(
-        config.parsePlatformTagName(tag), data, children,
-        undefined, undefined, context
+}
+
+var computedWatcherOptions = { lazy: true };
+
+function initComputed (vm, computed) {
+  // $flow-disable-line
+  var watchers = vm._computedWatchers = Object.create(null);
+  // computed properties are just getters during SSR
+  var isSSR = isServerRendering();
+
+  for (var key in computed) {
+    var userDef = computed[key];
+    var getter = typeof userDef === 'function' ? userDef : userDef.get;
+    if (getter == null) {
+      warn(
+        ("Getter is missing for computed property \"" + key + "\"."),
+        vm
       );
-    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-      // component
-      vnode = createComponent(Ctor, data, context, children, tag);
-    } else {
-      // unknown or unlisted namespaced elements
-      // check at runtime because it may get assigned a namespace when its
-      // parent normalizes children
-      vnode = new VNode(
-        tag, data, children,
-        undefined, undefined, context
+    }
+
+    if (!isSSR) {
+      // create internal watcher for the computed property.
+      watchers[key] = new Watcher(
+        vm,
+        getter || noop,
+        noop,
+        computedWatcherOptions
       );
     }
-  } else {
-    // direct component options / constructor
-    vnode = createComponent(tag, data, context, children);
+
+    // component-defined computed properties are already defined on the
+    // component prototype. We only need to define computed properties defined
+    // at instantiation here.
+    if (!(key in vm)) {
+      defineComputed(vm, key, userDef);
+    } else {
+      if (key in vm.$data) {
+        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
+      } else if (vm.$options.props && key in vm.$options.props) {
+        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+      }
+    }
   }
-  if (Array.isArray(vnode)) {
-    return vnode
-  } else if (isDef(vnode)) {
-    if (isDef(ns)) { applyNS(vnode, ns); }
-    if (isDef(data)) { registerDeepBindings(data); }
-    return vnode
+}
+
+function defineComputed (
+  target,
+  key,
+  userDef
+) {
+  var shouldCache = !isServerRendering();
+  if (typeof userDef === 'function') {
+    sharedPropertyDefinition.get = shouldCache
+      ? createComputedGetter(key)
+      : createGetterInvoker(userDef);
+    sharedPropertyDefinition.set = noop;
   } else {
-    return createEmptyVNode()
+    sharedPropertyDefinition.get = userDef.get
+      ? shouldCache && userDef.cache !== false
+        ? createComputedGetter(key)
+        : createGetterInvoker(userDef.get)
+      : noop;
+    sharedPropertyDefinition.set = userDef.set || noop;
   }
+  if (sharedPropertyDefinition.set === noop) {
+    sharedPropertyDefinition.set = function () {
+      warn(
+        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
+        this
+      );
+    };
+  }
+  Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
-function applyNS (vnode, ns, force) {
-  vnode.ns = ns;
-  if (vnode.tag === 'foreignObject') {
-    // use default namespace inside foreignObject
-    ns = undefined;
-    force = true;
-  }
-  if (isDef(vnode.children)) {
-    for (var i = 0, l = vnode.children.length; i < l; i++) {
-      var child = vnode.children[i];
-      if (isDef(child.tag) && (
-        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-        applyNS(child, ns, force);
+function createComputedGetter (key) {
+  return function computedGetter () {
+    var watcher = this._computedWatchers && this._computedWatchers[key];
+    if (watcher) {
+      if (watcher.dirty) {
+        watcher.evaluate();
       }
+      if (Dep.target) {
+        watcher.depend();
+      }
+      return watcher.value
     }
   }
 }
 
-// ref #5318
-// necessary to ensure parent re-render when deep bindings like :style and
-// :class are used on slot nodes
-function registerDeepBindings (data) {
-  if (isObject(data.style)) {
-    traverse(data.style);
-  }
-  if (isObject(data.class)) {
-    traverse(data.class);
+function createGetterInvoker(fn) {
+  return function computedGetter () {
+    return fn.call(this, this)
   }
 }
 
-/*  */
-
-function initRender (vm) {
-  vm._vnode = null; // the root of the child tree
-  vm._staticTrees = null; // v-once cached trees
-  var options = vm.$options;
-  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
-  var renderContext = parentVnode && parentVnode.context;
-  vm.$slots = resolveSlots(options._renderChildren, renderContext);
-  vm.$scopedSlots = emptyObject;
-  // bind the createElement fn to this instance
-  // so that we get proper render context inside it.
-  // args order: tag, data, children, normalizationType, alwaysNormalize
-  // internal version is used by render functions compiled from templates
-  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
-  // normalization is always applied for the public version, used in
-  // user-written render functions.
-  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+function initMethods (vm, methods) {
+  var props = vm.$options.props;
+  for (var key in methods) {
+    {
+      if (typeof methods[key] !== 'function') {
+        warn(
+          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
+          "Did you reference the function correctly?",
+          vm
+        );
+      }
+      if (props && hasOwn(props, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a prop."),
+          vm
+        );
+      }
+      if ((key in vm) && isReserved(key)) {
+        warn(
+          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
+          "Avoid defining component methods that start with _ or $."
+        );
+      }
+    }
+    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+  }
+}
 
-  // $attrs & $listeners are exposed for easier HOC creation.
-  // they need to be reactive so that HOCs using them are always updated
-  var parentData = parentVnode && parentVnode.data;
+function initWatch (vm, watch) {
+  for (var key in watch) {
+    var handler = watch[key];
+    if (Array.isArray(handler)) {
+      for (var i = 0; i < handler.length; i++) {
+        createWatcher(vm, key, handler[i]);
+      }
+    } else {
+      createWatcher(vm, key, handler);
+    }
+  }
+}
 
-  /* istanbul ignore else */
-  {
-    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
-    }, true);
-    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
-    }, true);
+function createWatcher (
+  vm,
+  expOrFn,
+  handler,
+  options
+) {
+  if (isPlainObject(handler)) {
+    options = handler;
+    handler = handler.handler;
+  }
+  if (typeof handler === 'string') {
+    handler = vm[handler];
   }
+  return vm.$watch(expOrFn, handler, options)
 }
 
-function renderMixin (Vue) {
-  // install runtime convenience helpers
-  installRenderHelpers(Vue.prototype);
+function stateMixin (Vue) {
+  // flow somehow has problems with directly declared definition object
+  // when using Object.defineProperty, so we have to procedurally build up
+  // the object here.
+  var dataDef = {};
+  dataDef.get = function () { return this._data };
+  var propsDef = {};
+  propsDef.get = function () { return this._props };
+  {
+    dataDef.set = function () {
+      warn(
+        'Avoid replacing instance root $data. ' +
+        'Use nested data properties instead.',
+        this
+      );
+    };
+    propsDef.set = function () {
+      warn("$props is readonly.", this);
+    };
+  }
+  Object.defineProperty(Vue.prototype, '$data', dataDef);
+  Object.defineProperty(Vue.prototype, '$props', propsDef);
 
-  Vue.prototype.$nextTick = function (fn) {
-    return nextTick(fn, this)
-  };
+  Vue.prototype.$set = set;
+  Vue.prototype.$delete = del;
 
-  Vue.prototype._render = function () {
+  Vue.prototype.$watch = function (
+    expOrFn,
+    cb,
+    options
+  ) {
     var vm = this;
-    var ref = vm.$options;
-    var render = ref.render;
-    var _parentVnode = ref._parentVnode;
-
-    if (_parentVnode) {
-      vm.$scopedSlots = normalizeScopedSlots(
-        _parentVnode.data.scopedSlots,
-        vm.$slots
-      );
+    if (isPlainObject(cb)) {
+      return createWatcher(vm, expOrFn, cb, options)
     }
-
-    // set parent vnode. this allows render functions to have access
-    // to the data on the placeholder node.
-    vm.$vnode = _parentVnode;
-    // render self
-    var vnode;
-    try {
-      vnode = render.call(vm._renderProxy, vm.$createElement);
-    } catch (e) {
-      handleError(e, vm, "render");
-      // return error render result,
-      // or previous vnode to prevent render error causing blank component
-      /* istanbul ignore else */
-      if (vm.$options.renderError) {
-        try {
-          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
-        } catch (e) {
-          handleError(e, vm, "renderError");
-          vnode = vm._vnode;
-        }
-      } else {
-        vnode = vm._vnode;
+    options = options || {};
+    options.user = true;
+    var watcher = new Watcher(vm, expOrFn, cb, options);
+    if (options.immediate) {
+      try {
+        cb.call(vm, watcher.value);
+      } catch (error) {
+        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
       }
     }
-    // if the returned array contains only a single node, allow it
-    if (Array.isArray(vnode) && vnode.length === 1) {
-      vnode = vnode[0];
-    }
-    // return empty vnode in case the render function errored out
-    if (!(vnode instanceof VNode)) {
-      if (Array.isArray(vnode)) {
-        warn(
-          'Multiple root nodes returned from render function. Render function ' +
-          'should return a single root node.',
-          vm
-        );
-      }
-      vnode = createEmptyVNode();
+    return function unwatchFn () {
+      watcher.teardown();
     }
-    // set parent
-    vnode.parent = _parentVnode;
-    return vnode
   };
 }
 
@@ -5319,7 +5322,7 @@ Object.defineProperty(Vue, 'FunctionalRenderContext', {
   value: FunctionalRenderContext
 });
 
-Vue.version = '2.6.2';
+Vue.version = '2.6.3';
 
 /*  */
 
@@ -6744,6 +6747,11 @@ function createOnceHandler$1 (event, handler, capture) {
   }
 }
 
+// #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+// implementation and does not fire microtasks in between event propagation, so
+// safe to exclude.
+var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
 function add$1 (
   name,
   handler,
@@ -6756,11 +6764,16 @@ function add$1 (
   // the solution is simple: we save the timestamp when a handler is attached,
   // and the handler would only fire if the event passed to it was fired
   // AFTER it was attached.
-  if (isUsingMicroTask) {
+  if (useMicrotaskFix) {
     var attachedTimestamp = currentFlushTimestamp;
     var original = handler;
     handler = original._wrapper = function (e) {
-      if (e.timeStamp >= attachedTimestamp) {
+      if (
+        e.timeStamp >= attachedTimestamp ||
+        // #9448 bail if event is fired in another document in a multi-page
+        // electron/nw.js app
+        e.target.ownerDocument !== document
+      ) {
         return original.apply(this, arguments)
       }
     };
diff --git a/dist/vue.runtime.common.prod.js b/dist/vue.runtime.common.prod.js
index 839e299e7cb..9471ab16c66 100644
--- a/dist/vue.runtime.common.prod.js
+++ b/dist/vue.runtime.common.prod.js
@@ -1,6 +1,6 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
-"use strict";var t=Object.freeze({});function e(t){return null==t}function n(t){return null!=t}function r(t){return!0===t}function o(t){return"string"==typeof t||"number"==typeof t||"symbol"==typeof t||"boolean"==typeof t}function i(t){return null!==t&&"object"==typeof t}var a=Object.prototype.toString;function s(t){return"[object Object]"===a.call(t)}function c(t){var e=parseFloat(String(t));return e>=0&&Math.floor(e)===e&&isFinite(t)}function u(t){return n(t)&&"function"==typeof t.then&&"function"==typeof t.catch}function l(t){return null==t?"":Array.isArray(t)||s(t)&&t.toString===a?JSON.stringify(t,null,2):String(t)}function f(t){var e=parseFloat(t);return isNaN(e)?t:e}function p(t,e){for(var n=Object.create(null),r=t.split(","),o=0;o<r.length;o++)n[r[o]]=!0;return e?function(t){return n[t.toLowerCase()]}:function(t){return n[t]}}var d=p("key,ref,slot,slot-scope,is");function v(t,e){if(t.length){var n=t.indexOf(e);if(n>-1)return t.splice(n,1)}}var h=Object.prototype.hasOwnProperty;function m(t,e){return h.call(t,e)}function y(t){var e=Object.create(null);return function(n){return e[n]||(e[n]=t(n))}}var g=/-(\w)/g,_=y(function(t){return t.replace(g,function(t,e){return e?e.toUpperCase():""})}),b=y(function(t){return t.charAt(0).toUpperCase()+t.slice(1)}),C=/\B([A-Z])/g,A=y(function(t){return t.replace(C,"-$1").toLowerCase()});var w=Function.prototype.bind?function(t,e){return t.bind(e)}:function(t,e){function n(n){var r=arguments.length;return r?r>1?t.apply(e,arguments):t.call(e,n):t.call(e)}return n._length=t.length,n};function $(t,e){e=e||0;for(var n=t.length-e,r=new Array(n);n--;)r[n]=t[n+e];return r}function x(t,e){for(var n in e)t[n]=e[n];return t}function O(t){for(var e={},n=0;n<t.length;n++)t[n]&&x(e,t[n]);return e}function k(t,e,n){}var S=function(t,e,n){return!1},E=function(t){return t};function j(t,e){if(t===e)return!0;var n=i(t),r=i(e);if(!n||!r)return!n&&!r&&String(t)===String(e);try{var 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c=o[s];c.tag&&null!=c.key&&0!==String(c.key).indexOf("__vlist")&&(i.push(c),n[c.key]=c,(c.data||(c.data={})).transition=a)}if(r){for(var u=[],l=[],f=0;f<r.length;f++){var p=r[f];p.data.transition=a,p.data.pos=p.elm.getBoundingClientRect(),n[p.key]?u.push(p):l.push(p)}this.kept=t(e,null,u),this.removed=l}return t(e,null,i)},updated:function(){var t=this.prevChildren,e=this.moveClass||(this.name||"v")+"-move";t.length&&this.hasMove(t[0].elm,e)&&(t.forEach(Eo),t.forEach(jo),t.forEach(Io),this._reflow=document.body.offsetHeight,t.forEach(function(t){if(t.data.moved){var n=t.elm,r=n.style;Jr(n,e),r.transform=r.WebkitTransform=r.transitionDuration="",n.addEventListener(qr,n._moveCb=function t(r){r&&r.target!==n||r&&!/transform$/.test(r.propertyName)||(n.removeEventListener(qr,t),n._moveCb=null,Qr(n,e))})}}))},methods:{hasMove:function(t,e){if(!Vr)return!1;if(this._hasMove)return this._hasMove;var n=t.cloneNode();t._transitionClasses&&t._transitionClasses.forEach(function(t){Rr(n,t)}),Fr(n,e),n.style.display="none",this.$el.appendChild(n);var r=eo(n);return this.$el.removeChild(n),this._hasMove=r.hasTransform}}}};_n.config.mustUseProp=function(t,e,n){return"value"===n&&Sn(t)&&"button"!==e||"selected"===n&&"option"===t||"checked"===n&&"input"===t||"muted"===n&&"video"===t},_n.config.isReservedTag=zn,_n.config.isReservedAttr=kn,_n.config.getTagNamespace=function(t){return Bn(t)?"svg":"math"===t?"math":void 0},_n.config.isUnknownElement=function(t){if(!H)return!0;if(zn(t))return!1;if(t=t.toLowerCase(),null!=Wn[t])return Wn[t];var e=document.createElement(t);return t.indexOf("-")>-1?Wn[t]=e.constructor===window.HTMLUnknownElement||e.constructor===window.HTMLElement:Wn[t]=/HTMLUnknownElement/.test(e.toString())},x(_n.options.directives,bo),x(_n.options.components,To),_n.prototype.__patch__=H?uo:k,_n.prototype.$mount=function(t,e){return function(t,e,n){var r;return t.$el=e,t.$options.render||(t.$options.render=pt),Ze(t,"beforeMount"),r=function(){t._update(t._render(),n)},new cn(t,r,k,{before:function(){t._isMounted&&!t._isDestroyed&&Ze(t,"beforeUpdate")}},!0),n=!1,null==t.$vnode&&(t._isMounted=!0,Ze(t,"mounted")),t}(this,t=t&&H?function(t){if("string"==typeof t){var e=document.querySelector(t);return e||document.createElement("div")}return t}(t):void 0,e)},H&&setTimeout(function(){P.devtools&&tt&&tt.emit("init",_n)},0),module.exports=_n;
\ No newline at end of file
diff --git a/dist/vue.runtime.esm.js b/dist/vue.runtime.esm.js
index 1c09d41199e..5cadd3ea6e8 100644
--- a/dist/vue.runtime.esm.js
+++ b/dist/vue.runtime.esm.js
@@ -1,5 +1,5 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
@@ -523,6 +523,7 @@ var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android'
 var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
 var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 var isPhantomJS = UA && /phantomjs/.test(UA);
+var isFF = UA && UA.match(/firefox\/(\d+)/);
 
 // Firefox has a "watch" function on Object.prototype...
 var nativeWatch = ({}).watch;
@@ -2399,2450 +2400,2452 @@ function normalizeArrayChildren (children, nestedIndex) {
 
 /*  */
 
-function ensureCtor (comp, base) {
-  if (
-    comp.__esModule ||
-    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-  ) {
-    comp = comp.default;
+function initProvide (vm) {
+  var provide = vm.$options.provide;
+  if (provide) {
+    vm._provided = typeof provide === 'function'
+      ? provide.call(vm)
+      : provide;
   }
-  return isObject(comp)
-    ? base.extend(comp)
-    : comp
-}
-
-function createAsyncPlaceholder (
-  factory,
-  data,
-  context,
-  children,
-  tag
-) {
-  var node = createEmptyVNode();
-  node.asyncFactory = factory;
-  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-  return node
 }
 
-function resolveAsyncComponent (
-  factory,
-  baseCtor,
-  context
-) {
-  if (isTrue(factory.error) && isDef(factory.errorComp)) {
-    return factory.errorComp
-  }
-
-  if (isDef(factory.resolved)) {
-    return factory.resolved
-  }
-
-  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-    return factory.loadingComp
-  }
-
-  if (isDef(factory.contexts)) {
-    // already pending
-    factory.contexts.push(context);
-  } else {
-    var contexts = factory.contexts = [context];
-    var sync = true;
-
-    var forceRender = function (renderCompleted) {
-      for (var i = 0, l = contexts.length; i < l; i++) {
-        contexts[i].$forceUpdate();
-      }
-
-      if (renderCompleted) {
-        contexts.length = 0;
-      }
-    };
-
-    var resolve = once(function (res) {
-      // cache resolved
-      factory.resolved = ensureCtor(res, baseCtor);
-      // invoke callbacks only if this is not a synchronous resolve
-      // (async resolves are shimmed as synchronous during SSR)
-      if (!sync) {
-        forceRender(true);
+function initInjections (vm) {
+  var result = resolveInject(vm.$options.inject, vm);
+  if (result) {
+    toggleObserving(false);
+    Object.keys(result).forEach(function (key) {
+      /* istanbul ignore else */
+      if (process.env.NODE_ENV !== 'production') {
+        defineReactive$$1(vm, key, result[key], function () {
+          warn(
+            "Avoid mutating an injected value directly since the changes will be " +
+            "overwritten whenever the provided component re-renders. " +
+            "injection being mutated: \"" + key + "\"",
+            vm
+          );
+        });
       } else {
-        contexts.length = 0;
-      }
-    });
-
-    var reject = once(function (reason) {
-      process.env.NODE_ENV !== 'production' && warn(
-        "Failed to resolve async component: " + (String(factory)) +
-        (reason ? ("\nReason: " + reason) : '')
-      );
-      if (isDef(factory.errorComp)) {
-        factory.error = true;
-        forceRender(true);
+        defineReactive$$1(vm, key, result[key]);
       }
     });
+    toggleObserving(true);
+  }
+}
 
-    var res = factory(resolve, reject);
-
-    if (isObject(res)) {
-      if (isPromise(res)) {
-        // () => Promise
-        if (isUndef(factory.resolved)) {
-          res.then(resolve, reject);
-        }
-      } else if (isPromise(res.component)) {
-        res.component.then(resolve, reject);
-
-        if (isDef(res.error)) {
-          factory.errorComp = ensureCtor(res.error, baseCtor);
-        }
+function resolveInject (inject, vm) {
+  if (inject) {
+    // inject is :any because flow is not smart enough to figure out cached
+    var result = Object.create(null);
+    var keys = hasSymbol
+      ? Reflect.ownKeys(inject)
+      : Object.keys(inject);
 
-        if (isDef(res.loading)) {
-          factory.loadingComp = ensureCtor(res.loading, baseCtor);
-          if (res.delay === 0) {
-            factory.loading = true;
-          } else {
-            setTimeout(function () {
-              if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                factory.loading = true;
-                forceRender(false);
-              }
-            }, res.delay || 200);
-          }
+    for (var i = 0; i < keys.length; i++) {
+      var key = keys[i];
+      // #6574 in case the inject object is observed...
+      if (key === '__ob__') { continue }
+      var provideKey = inject[key].from;
+      var source = vm;
+      while (source) {
+        if (source._provided && hasOwn(source._provided, provideKey)) {
+          result[key] = source._provided[provideKey];
+          break
         }
-
-        if (isDef(res.timeout)) {
-          setTimeout(function () {
-            if (isUndef(factory.resolved)) {
-              reject(
-                process.env.NODE_ENV !== 'production'
-                  ? ("timeout (" + (res.timeout) + "ms)")
-                  : null
-              );
-            }
-          }, res.timeout);
+        source = source.$parent;
+      }
+      if (!source) {
+        if ('default' in inject[key]) {
+          var provideDefault = inject[key].default;
+          result[key] = typeof provideDefault === 'function'
+            ? provideDefault.call(vm)
+            : provideDefault;
+        } else if (process.env.NODE_ENV !== 'production') {
+          warn(("Injection \"" + key + "\" not found"), vm);
         }
       }
     }
-
-    sync = false;
-    // return in case resolved synchronously
-    return factory.loading
-      ? factory.loadingComp
-      : factory.resolved
+    return result
   }
 }
 
 /*  */
 
-function isAsyncPlaceholder (node) {
-  return node.isComment && node.asyncFactory
-}
 
-/*  */
 
-function getFirstComponentChild (children) {
-  if (Array.isArray(children)) {
-    for (var i = 0; i < children.length; i++) {
-      var c = children[i];
-      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
-        return c
+/**
+ * Runtime helper for resolving raw children VNodes into a slot object.
+ */
+function resolveSlots (
+  children,
+  context
+) {
+  if (!children || !children.length) {
+    return {}
+  }
+  var slots = {};
+  for (var i = 0, l = children.length; i < l; i++) {
+    var child = children[i];
+    var data = child.data;
+    // remove slot attribute if the node is resolved as a Vue slot node
+    if (data && data.attrs && data.attrs.slot) {
+      delete data.attrs.slot;
+    }
+    // named slots should only be respected if the vnode was rendered in the
+    // same context.
+    if ((child.context === context || child.fnContext === context) &&
+      data && data.slot != null
+    ) {
+      var name = data.slot;
+      var slot = (slots[name] || (slots[name] = []));
+      if (child.tag === 'template') {
+        slot.push.apply(slot, child.children || []);
+      } else {
+        slot.push(child);
       }
+    } else {
+      (slots.default || (slots.default = [])).push(child);
+    }
+  }
+  // ignore slots that contains only whitespace
+  for (var name$1 in slots) {
+    if (slots[name$1].every(isWhitespace)) {
+      delete slots[name$1];
     }
   }
+  return slots
 }
 
-/*  */
+function isWhitespace (node) {
+  return (node.isComment && !node.asyncFactory) || node.text === ' '
+}
 
 /*  */
 
-function initEvents (vm) {
-  vm._events = Object.create(null);
-  vm._hasHookEvent = false;
-  // init parent attached events
-  var listeners = vm.$options._parentListeners;
-  if (listeners) {
-    updateComponentListeners(vm, listeners);
+function normalizeScopedSlots (
+  slots,
+  normalSlots
+) {
+  var res;
+  if (!slots) {
+    res = {};
+  } else if (slots._normalized) {
+    return slots
+  } else {
+    res = {};
+    for (var key in slots) {
+      if (slots[key] && key[0] !== '$') {
+        res[key] = normalizeScopedSlot(slots[key]);
+      }
+    }
+  }
+  // expose normal slots on scopedSlots
+  for (var key$1 in normalSlots) {
+    if (!(key$1 in res)) {
+      res[key$1] = proxyNormalSlot(normalSlots, key$1);
+    }
   }
+  def(res, '_normalized', true);
+  def(res, '$stable', slots ? !!slots.$stable : true);
+  return res
 }
 
-var target;
+function normalizeScopedSlot(fn) {
+  return function (scope) {
+    var res = fn(scope);
+    return res && typeof res === 'object' && !Array.isArray(res)
+      ? [res] // single vnode
+      : normalizeChildren(res)
+  }
+}
 
-function add (event, fn) {
-  target.$on(event, fn);
+function proxyNormalSlot(slots, key) {
+  return function () { return slots[key]; }
 }
 
-function remove$1 (event, fn) {
-  target.$off(event, fn);
-}
-
-function createOnceHandler (event, fn) {
-  var _target = target;
-  return function onceHandler () {
-    var res = fn.apply(null, arguments);
-    if (res !== null) {
-      _target.$off(event, onceHandler);
-    }
-  }
-}
+/*  */
 
-function updateComponentListeners (
-  vm,
-  listeners,
-  oldListeners
+/**
+ * Runtime helper for rendering v-for lists.
+ */
+function renderList (
+  val,
+  render
 ) {
-  target = vm;
-  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-  target = undefined;
-}
-
-function eventsMixin (Vue) {
-  var hookRE = /^hook:/;
-  Vue.prototype.$on = function (event, fn) {
-    var vm = this;
-    if (Array.isArray(event)) {
-      for (var i = 0, l = event.length; i < l; i++) {
-        vm.$on(event[i], fn);
-      }
-    } else {
-      (vm._events[event] || (vm._events[event] = [])).push(fn);
-      // optimize hook:event cost by using a boolean flag marked at registration
-      // instead of a hash lookup
-      if (hookRE.test(event)) {
-        vm._hasHookEvent = true;
-      }
-    }
-    return vm
-  };
-
-  Vue.prototype.$once = function (event, fn) {
-    var vm = this;
-    function on () {
-      vm.$off(event, on);
-      fn.apply(vm, arguments);
-    }
-    on.fn = fn;
-    vm.$on(event, on);
-    return vm
-  };
-
-  Vue.prototype.$off = function (event, fn) {
-    var vm = this;
-    // all
-    if (!arguments.length) {
-      vm._events = Object.create(null);
-      return vm
-    }
-    // array of events
-    if (Array.isArray(event)) {
-      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
-        vm.$off(event[i$1], fn);
-      }
-      return vm
-    }
-    // specific event
-    var cbs = vm._events[event];
-    if (!cbs) {
-      return vm
-    }
-    if (!fn) {
-      vm._events[event] = null;
-      return vm
+  var ret, i, l, keys, key;
+  if (Array.isArray(val) || typeof val === 'string') {
+    ret = new Array(val.length);
+    for (i = 0, l = val.length; i < l; i++) {
+      ret[i] = render(val[i], i);
     }
-    // specific handler
-    var cb;
-    var i = cbs.length;
-    while (i--) {
-      cb = cbs[i];
-      if (cb === fn || cb.fn === fn) {
-        cbs.splice(i, 1);
-        break
-      }
+  } else if (typeof val === 'number') {
+    ret = new Array(val);
+    for (i = 0; i < val; i++) {
+      ret[i] = render(i + 1, i);
     }
-    return vm
-  };
-
-  Vue.prototype.$emit = function (event) {
-    var vm = this;
-    if (process.env.NODE_ENV !== 'production') {
-      var lowerCaseEvent = event.toLowerCase();
-      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
-        tip(
-          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
-          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
-          "Note that HTML attributes are case-insensitive and you cannot use " +
-          "v-on to listen to camelCase events when using in-DOM templates. " +
-          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
-        );
+  } else if (isObject(val)) {
+    if (hasSymbol && val[Symbol.iterator]) {
+      ret = [];
+      var iterator = val[Symbol.iterator]();
+      var result = iterator.next();
+      while (!result.done) {
+        ret.push(render(result.value, ret.length));
+        result = iterator.next();
       }
-    }
-    var cbs = vm._events[event];
-    if (cbs) {
-      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
-      var args = toArray(arguments, 1);
-      var info = "event handler for \"" + event + "\"";
-      for (var i = 0, l = cbs.length; i < l; i++) {
-        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+    } else {
+      keys = Object.keys(val);
+      ret = new Array(keys.length);
+      for (i = 0, l = keys.length; i < l; i++) {
+        key = keys[i];
+        ret[i] = render(val[key], key, i);
       }
     }
-    return vm
-  };
+  }
+  if (!isDef(ret)) {
+    ret = [];
+  }
+  (ret)._isVList = true;
+  return ret
 }
 
 /*  */
 
-
-
 /**
- * Runtime helper for resolving raw children VNodes into a slot object.
+ * Runtime helper for rendering <slot>
  */
-function resolveSlots (
-  children,
-  context
+function renderSlot (
+  name,
+  fallback,
+  props,
+  bindObject
 ) {
-  if (!children || !children.length) {
-    return {}
-  }
-  var slots = {};
-  for (var i = 0, l = children.length; i < l; i++) {
-    var child = children[i];
-    var data = child.data;
-    // remove slot attribute if the node is resolved as a Vue slot node
-    if (data && data.attrs && data.attrs.slot) {
-      delete data.attrs.slot;
-    }
-    // named slots should only be respected if the vnode was rendered in the
-    // same context.
-    if ((child.context === context || child.fnContext === context) &&
-      data && data.slot != null
-    ) {
-      var name = data.slot;
-      var slot = (slots[name] || (slots[name] = []));
-      if (child.tag === 'template') {
-        slot.push.apply(slot, child.children || []);
-      } else {
-        slot.push(child);
+  var scopedSlotFn = this.$scopedSlots[name];
+  var nodes;
+  if (scopedSlotFn) { // scoped slot
+    props = props || {};
+    if (bindObject) {
+      if (process.env.NODE_ENV !== 'production' && !isObject(bindObject)) {
+        warn(
+          'slot v-bind without argument expects an Object',
+          this
+        );
       }
-    } else {
-      (slots.default || (slots.default = [])).push(child);
-    }
-  }
-  // ignore slots that contains only whitespace
-  for (var name$1 in slots) {
-    if (slots[name$1].every(isWhitespace)) {
-      delete slots[name$1];
+      props = extend(extend({}, bindObject), props);
     }
+    nodes = scopedSlotFn(props) || fallback;
+  } else {
+    nodes = this.$slots[name] || fallback;
   }
-  return slots
-}
-
-function isWhitespace (node) {
-  return (node.isComment && !node.asyncFactory) || node.text === ' '
-}
 
-function resolveScopedSlots (
-  fns, // see flow/vnode
-  hasDynamicKeys,
-  res
-) {
-  res = res || { $stable: !hasDynamicKeys };
-  for (var i = 0; i < fns.length; i++) {
-    var slot = fns[i];
-    if (Array.isArray(slot)) {
-      resolveScopedSlots(slot, hasDynamicKeys, res);
-    } else if (slot) {
-      res[slot.key] = slot.fn;
-    }
+  var target = props && props.slot;
+  if (target) {
+    return this.$createElement('template', { slot: target }, nodes)
+  } else {
+    return nodes
   }
-  return res
 }
 
 /*  */
 
-var activeInstance = null;
-var isUpdatingChildComponent = false;
-
-function setActiveInstance(vm) {
-  var prevActiveInstance = activeInstance;
-  activeInstance = vm;
-  return function () {
-    activeInstance = prevActiveInstance;
-  }
+/**
+ * Runtime helper for resolving filters
+ */
+function resolveFilter (id) {
+  return resolveAsset(this.$options, 'filters', id, true) || identity
 }
 
-function initLifecycle (vm) {
-  var options = vm.$options;
+/*  */
 
-  // locate first non-abstract parent
-  var parent = options.parent;
-  if (parent && !options.abstract) {
-    while (parent.$options.abstract && parent.$parent) {
-      parent = parent.$parent;
-    }
-    parent.$children.push(vm);
+function isKeyNotMatch (expect, actual) {
+  if (Array.isArray(expect)) {
+    return expect.indexOf(actual) === -1
+  } else {
+    return expect !== actual
   }
+}
 
-  vm.$parent = parent;
-  vm.$root = parent ? parent.$root : vm;
-
-  vm.$children = [];
-  vm.$refs = {};
-
-  vm._watcher = null;
-  vm._inactive = null;
-  vm._directInactive = false;
-  vm._isMounted = false;
-  vm._isDestroyed = false;
-  vm._isBeingDestroyed = false;
+/**
+ * Runtime helper for checking keyCodes from config.
+ * exposed as Vue.prototype._k
+ * passing in eventKeyName as last argument separately for backwards compat
+ */
+function checkKeyCodes (
+  eventKeyCode,
+  key,
+  builtInKeyCode,
+  eventKeyName,
+  builtInKeyName
+) {
+  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+    return isKeyNotMatch(builtInKeyName, eventKeyName)
+  } else if (mappedKeyCode) {
+    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+  } else if (eventKeyName) {
+    return hyphenate(eventKeyName) !== key
+  }
 }
 
-function lifecycleMixin (Vue) {
-  Vue.prototype._update = function (vnode, hydrating) {
-    var vm = this;
-    var prevEl = vm.$el;
-    var prevVnode = vm._vnode;
-    var restoreActiveInstance = setActiveInstance(vm);
-    vm._vnode = vnode;
-    // Vue.prototype.__patch__ is injected in entry points
-    // based on the rendering backend used.
-    if (!prevVnode) {
-      // initial render
-      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+/*  */
+
+/**
+ * Runtime helper for merging v-bind="object" into a VNode's data.
+ */
+function bindObjectProps (
+  data,
+  tag,
+  value,
+  asProp,
+  isSync
+) {
+  if (value) {
+    if (!isObject(value)) {
+      process.env.NODE_ENV !== 'production' && warn(
+        'v-bind without argument expects an Object or Array value',
+        this
+      );
     } else {
-      // updates
-      vm.$el = vm.__patch__(prevVnode, vnode);
-    }
-    restoreActiveInstance();
-    // update __vue__ reference
-    if (prevEl) {
-      prevEl.__vue__ = null;
-    }
-    if (vm.$el) {
-      vm.$el.__vue__ = vm;
-    }
-    // if parent is an HOC, update its $el as well
-    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
-      vm.$parent.$el = vm.$el;
-    }
-    // updated hook is called by the scheduler to ensure that children are
-    // updated in a parent's updated hook.
-  };
+      if (Array.isArray(value)) {
+        value = toObject(value);
+      }
+      var hash;
+      var loop = function ( key ) {
+        if (
+          key === 'class' ||
+          key === 'style' ||
+          isReservedAttribute(key)
+        ) {
+          hash = data;
+        } else {
+          var type = data.attrs && data.attrs.type;
+          hash = asProp || config.mustUseProp(tag, type, key)
+            ? data.domProps || (data.domProps = {})
+            : data.attrs || (data.attrs = {});
+        }
+        var camelizedKey = camelize(key);
+        if (!(key in hash) && !(camelizedKey in hash)) {
+          hash[key] = value[key];
 
-  Vue.prototype.$forceUpdate = function () {
-    var vm = this;
-    if (vm._watcher) {
-      vm._watcher.update();
-    }
-  };
+          if (isSync) {
+            var on = data.on || (data.on = {});
+            on[("update:" + camelizedKey)] = function ($event) {
+              value[key] = $event;
+            };
+          }
+        }
+      };
 
-  Vue.prototype.$destroy = function () {
-    var vm = this;
-    if (vm._isBeingDestroyed) {
-      return
-    }
-    callHook(vm, 'beforeDestroy');
-    vm._isBeingDestroyed = true;
-    // remove self from parent
-    var parent = vm.$parent;
-    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
-      remove(parent.$children, vm);
-    }
-    // teardown watchers
-    if (vm._watcher) {
-      vm._watcher.teardown();
-    }
-    var i = vm._watchers.length;
-    while (i--) {
-      vm._watchers[i].teardown();
-    }
-    // remove reference from data ob
-    // frozen object may not have observer.
-    if (vm._data.__ob__) {
-      vm._data.__ob__.vmCount--;
-    }
-    // call the last hook...
-    vm._isDestroyed = true;
-    // invoke destroy hooks on current rendered tree
-    vm.__patch__(vm._vnode, null);
-    // fire destroyed hook
-    callHook(vm, 'destroyed');
-    // turn off all instance listeners.
-    vm.$off();
-    // remove __vue__ reference
-    if (vm.$el) {
-      vm.$el.__vue__ = null;
-    }
-    // release circular reference (#6759)
-    if (vm.$vnode) {
-      vm.$vnode.parent = null;
+      for (var key in value) loop( key );
     }
-  };
+  }
+  return data
 }
 
-function mountComponent (
-  vm,
-  el,
-  hydrating
+/*  */
+
+/**
+ * Runtime helper for rendering static trees.
+ */
+function renderStatic (
+  index,
+  isInFor
 ) {
-  vm.$el = el;
-  if (!vm.$options.render) {
-    vm.$options.render = createEmptyVNode;
-    if (process.env.NODE_ENV !== 'production') {
-      /* istanbul ignore if */
-      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
-        vm.$options.el || el) {
-        warn(
-          'You are using the runtime-only build of Vue where the template ' +
-          'compiler is not available. Either pre-compile the templates into ' +
-          'render functions, or use the compiler-included build.',
-          vm
-        );
-      } else {
-        warn(
-          'Failed to mount component: template or render function not defined.',
-          vm
-        );
+  var cached = this._staticTrees || (this._staticTrees = []);
+  var tree = cached[index];
+  // if has already-rendered static tree and not inside v-for,
+  // we can reuse the same tree.
+  if (tree && !isInFor) {
+    return tree
+  }
+  // otherwise, render a fresh tree.
+  tree = cached[index] = this.$options.staticRenderFns[index].call(
+    this._renderProxy,
+    null,
+    this // for render fns generated for functional component templates
+  );
+  markStatic(tree, ("__static__" + index), false);
+  return tree
+}
+
+/**
+ * Runtime helper for v-once.
+ * Effectively it means marking the node as static with a unique key.
+ */
+function markOnce (
+  tree,
+  index,
+  key
+) {
+  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+  return tree
+}
+
+function markStatic (
+  tree,
+  key,
+  isOnce
+) {
+  if (Array.isArray(tree)) {
+    for (var i = 0; i < tree.length; i++) {
+      if (tree[i] && typeof tree[i] !== 'string') {
+        markStaticNode(tree[i], (key + "_" + i), isOnce);
       }
     }
+  } else {
+    markStaticNode(tree, key, isOnce);
   }
-  callHook(vm, 'beforeMount');
+}
 
-  var updateComponent;
-  /* istanbul ignore if */
-  if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
-    updateComponent = function () {
-      var name = vm._name;
-      var id = vm._uid;
-      var startTag = "vue-perf-start:" + id;
-      var endTag = "vue-perf-end:" + id;
+function markStaticNode (node, key, isOnce) {
+  node.isStatic = true;
+  node.key = key;
+  node.isOnce = isOnce;
+}
 
-      mark(startTag);
-      var vnode = vm._render();
-      mark(endTag);
-      measure(("vue " + name + " render"), startTag, endTag);
+/*  */
 
-      mark(startTag);
-      vm._update(vnode, hydrating);
-      mark(endTag);
-      measure(("vue " + name + " patch"), startTag, endTag);
-    };
-  } else {
-    updateComponent = function () {
-      vm._update(vm._render(), hydrating);
-    };
+function bindObjectListeners (data, value) {
+  if (value) {
+    if (!isPlainObject(value)) {
+      process.env.NODE_ENV !== 'production' && warn(
+        'v-on without argument expects an Object value',
+        this
+      );
+    } else {
+      var on = data.on = data.on ? extend({}, data.on) : {};
+      for (var key in value) {
+        var existing = on[key];
+        var ours = value[key];
+        on[key] = existing ? [].concat(existing, ours) : ours;
+      }
+    }
   }
+  return data
+}
 
-  // we set this to vm._watcher inside the watcher's constructor
-  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
-  // component's mounted hook), which relies on vm._watcher being already defined
-  new Watcher(vm, updateComponent, noop, {
-    before: function before () {
-      if (vm._isMounted && !vm._isDestroyed) {
-        callHook(vm, 'beforeUpdate');
-      }
+/*  */
+
+function resolveScopedSlots (
+  fns, // see flow/vnode
+  hasDynamicKeys,
+  res
+) {
+  res = res || { $stable: !hasDynamicKeys };
+  for (var i = 0; i < fns.length; i++) {
+    var slot = fns[i];
+    if (Array.isArray(slot)) {
+      resolveScopedSlots(slot, hasDynamicKeys, res);
+    } else if (slot) {
+      res[slot.key] = slot.fn;
     }
-  }, true /* isRenderWatcher */);
-  hydrating = false;
+  }
+  return res
+}
 
-  // manually mounted instance, call mounted on self
-  // mounted is called for render-created child components in its inserted hook
-  if (vm.$vnode == null) {
-    vm._isMounted = true;
-    callHook(vm, 'mounted');
+/*  */
+
+function bindDynamicKeys (baseObj, values) {
+  for (var i = 0; i < values.length; i += 2) {
+    var key = values[i];
+    if (typeof key === 'string' && key) {
+      baseObj[values[i]] = values[i + 1];
+    } else if (process.env.NODE_ENV !== 'production' && key !== '' && key !== null) {
+      // null is a speical value for explicitly removing a binding
+      warn(
+        ("Invalid value for dynamic directive argument (expected string or null): " + key),
+        this
+      );
+    }
   }
-  return vm
+  return baseObj
 }
 
-function updateChildComponent (
-  vm,
-  propsData,
-  listeners,
-  parentVnode,
-  renderChildren
+// helper to dynamically append modifier runtime markers to event names.
+// ensure only append when value is already string, otherwise it will be cast
+// to string and cause the type check to miss.
+function prependModifier (value, symbol) {
+  return typeof value === 'string' ? symbol + value : value
+}
+
+/*  */
+
+function installRenderHelpers (target) {
+  target._o = markOnce;
+  target._n = toNumber;
+  target._s = toString;
+  target._l = renderList;
+  target._t = renderSlot;
+  target._q = looseEqual;
+  target._i = looseIndexOf;
+  target._m = renderStatic;
+  target._f = resolveFilter;
+  target._k = checkKeyCodes;
+  target._b = bindObjectProps;
+  target._v = createTextVNode;
+  target._e = createEmptyVNode;
+  target._u = resolveScopedSlots;
+  target._g = bindObjectListeners;
+  target._d = bindDynamicKeys;
+  target._p = prependModifier;
+}
+
+/*  */
+
+function FunctionalRenderContext (
+  data,
+  props,
+  children,
+  parent,
+  Ctor
 ) {
-  if (process.env.NODE_ENV !== 'production') {
-    isUpdatingChildComponent = true;
+  var options = Ctor.options;
+  // ensure the createElement function in functional components
+  // gets a unique context - this is necessary for correct named slot check
+  var contextVm;
+  if (hasOwn(parent, '_uid')) {
+    contextVm = Object.create(parent);
+    // $flow-disable-line
+    contextVm._original = parent;
+  } else {
+    // the context vm passed in is a functional context as well.
+    // in this case we want to make sure we are able to get a hold to the
+    // real context instance.
+    contextVm = parent;
+    // $flow-disable-line
+    parent = parent._original;
   }
+  var isCompiled = isTrue(options._compiled);
+  var needNormalization = !isCompiled;
 
-  // determine whether component has slot children
-  // we need to do this before overwriting $options._renderChildren.
+  this.data = data;
+  this.props = props;
+  this.children = children;
+  this.parent = parent;
+  this.listeners = data.on || emptyObject;
+  this.injections = resolveInject(options.inject, parent);
+  this.slots = function () { return resolveSlots(children, parent); };
 
-  // check if there are dynamic scopedSlots (hand-written or compiled but with
-  // dynamic slot names). Static scoped slots compiled from template has the
-  // "$stable" marker.
-  var hasDynamicScopedSlot = !!(
-    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-  );
-  // Any static slot children from the parent may have changed during parent's
-  // update. Dynamic scoped slots may also have changed. In such cases, a forced
-  // update is necessary to ensure correctness.
-  var needsForceUpdate = !!(
-    renderChildren ||               // has new static slots
-    vm.$options._renderChildren ||  // has old static slots
-    hasDynamicScopedSlot
-  );
+  Object.defineProperty(this, 'scopedSlots', ({
+    enumerable: true,
+    get: function get () {
+      return normalizeScopedSlots(data.scopedSlots, this.slots())
+    }
+  }));
 
-  vm.$options._parentVnode = parentVnode;
-  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+  // support for compiled functional template
+  if (isCompiled) {
+    // exposing $options for renderStatic()
+    this.$options = options;
+    // pre-resolve slots for renderSlot()
+    this.$slots = this.slots();
+    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
+  }
 
-  if (vm._vnode) { // update child tree's parent
-    vm._vnode.parent = parentVnode;
+  if (options._scopeId) {
+    this._c = function (a, b, c, d) {
+      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
+      if (vnode && !Array.isArray(vnode)) {
+        vnode.fnScopeId = options._scopeId;
+        vnode.fnContext = parent;
+      }
+      return vnode
+    };
+  } else {
+    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
   }
-  vm.$options._renderChildren = renderChildren;
+}
 
-  // update $attrs and $listeners hash
-  // these are also reactive so they may trigger child update if the child
-  // used them during render
-  vm.$attrs = parentVnode.data.attrs || emptyObject;
-  vm.$listeners = listeners || emptyObject;
+installRenderHelpers(FunctionalRenderContext.prototype);
 
-  // update props
-  if (propsData && vm.$options.props) {
-    toggleObserving(false);
-    var props = vm._props;
-    var propKeys = vm.$options._propKeys || [];
-    for (var i = 0; i < propKeys.length; i++) {
-      var key = propKeys[i];
-      var propOptions = vm.$options.props; // wtf flow?
-      props[key] = validateProp(key, propOptions, propsData, vm);
+function createFunctionalComponent (
+  Ctor,
+  propsData,
+  data,
+  contextVm,
+  children
+) {
+  var options = Ctor.options;
+  var props = {};
+  var propOptions = options.props;
+  if (isDef(propOptions)) {
+    for (var key in propOptions) {
+      props[key] = validateProp(key, propOptions, propsData || emptyObject);
     }
-    toggleObserving(true);
-    // keep a copy of raw propsData
-    vm.$options.propsData = propsData;
+  } else {
+    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
+    if (isDef(data.props)) { mergeProps(props, data.props); }
   }
 
-  // update listeners
-  listeners = listeners || emptyObject;
-  var oldListeners = vm.$options._parentListeners;
-  vm.$options._parentListeners = listeners;
-  updateComponentListeners(vm, listeners, oldListeners);
+  var renderContext = new FunctionalRenderContext(
+    data,
+    props,
+    children,
+    contextVm,
+    Ctor
+  );
 
-  // resolve slots + force update if has children
-  if (needsForceUpdate) {
-    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-    vm.$forceUpdate();
+  var vnode = options.render.call(null, renderContext._c, renderContext);
+
+  if (vnode instanceof VNode) {
+    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+  } else if (Array.isArray(vnode)) {
+    var vnodes = normalizeChildren(vnode) || [];
+    var res = new Array(vnodes.length);
+    for (var i = 0; i < vnodes.length; i++) {
+      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+    }
+    return res
   }
+}
 
+function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+  // #7817 clone node before setting fnContext, otherwise if the node is reused
+  // (e.g. it was from a cached normal slot) the fnContext causes named slots
+  // that should not be matched to match.
+  var clone = cloneVNode(vnode);
+  clone.fnContext = contextVm;
+  clone.fnOptions = options;
   if (process.env.NODE_ENV !== 'production') {
-    isUpdatingChildComponent = false;
+    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
   }
+  if (data.slot) {
+    (clone.data || (clone.data = {})).slot = data.slot;
+  }
+  return clone
 }
 
-function isInInactiveTree (vm) {
-  while (vm && (vm = vm.$parent)) {
-    if (vm._inactive) { return true }
+function mergeProps (to, from) {
+  for (var key in from) {
+    to[camelize(key)] = from[key];
   }
-  return false
 }
 
-function activateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = false;
-    if (isInInactiveTree(vm)) {
-      return
-    }
-  } else if (vm._directInactive) {
-    return
-  }
-  if (vm._inactive || vm._inactive === null) {
-    vm._inactive = false;
-    for (var i = 0; i < vm.$children.length; i++) {
-      activateChildComponent(vm.$children[i]);
+/*  */
+
+/*  */
+
+/*  */
+
+/*  */
+
+// inline hooks to be invoked on component VNodes during patch
+var componentVNodeHooks = {
+  init: function init (vnode, hydrating) {
+    if (
+      vnode.componentInstance &&
+      !vnode.componentInstance._isDestroyed &&
+      vnode.data.keepAlive
+    ) {
+      // kept-alive components, treat as a patch
+      var mountedNode = vnode; // work around flow
+      componentVNodeHooks.prepatch(mountedNode, mountedNode);
+    } else {
+      var child = vnode.componentInstance = createComponentInstanceForVnode(
+        vnode,
+        activeInstance
+      );
+      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
     }
-    callHook(vm, 'activated');
-  }
-}
+  },
 
-function deactivateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = true;
-    if (isInInactiveTree(vm)) {
-      return
+  prepatch: function prepatch (oldVnode, vnode) {
+    var options = vnode.componentOptions;
+    var child = vnode.componentInstance = oldVnode.componentInstance;
+    updateChildComponent(
+      child,
+      options.propsData, // updated props
+      options.listeners, // updated listeners
+      vnode, // new parent vnode
+      options.children // new children
+    );
+  },
+
+  insert: function insert (vnode) {
+    var context = vnode.context;
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isMounted) {
+      componentInstance._isMounted = true;
+      callHook(componentInstance, 'mounted');
     }
-  }
-  if (!vm._inactive) {
-    vm._inactive = true;
-    for (var i = 0; i < vm.$children.length; i++) {
-      deactivateChildComponent(vm.$children[i]);
+    if (vnode.data.keepAlive) {
+      if (context._isMounted) {
+        // vue-router#1212
+        // During updates, a kept-alive component's child components may
+        // change, so directly walking the tree here may call activated hooks
+        // on incorrect children. Instead we push them into a queue which will
+        // be processed after the whole patch process ended.
+        queueActivatedComponent(componentInstance);
+      } else {
+        activateChildComponent(componentInstance, true /* direct */);
+      }
     }
-    callHook(vm, 'deactivated');
-  }
-}
+  },
 
-function callHook (vm, hook) {
-  // #7573 disable dep collection when invoking lifecycle hooks
-  pushTarget();
-  var handlers = vm.$options[hook];
-  var info = hook + " hook";
-  if (handlers) {
-    for (var i = 0, j = handlers.length; i < j; i++) {
-      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+  destroy: function destroy (vnode) {
+    var componentInstance = vnode.componentInstance;
+    if (!componentInstance._isDestroyed) {
+      if (!vnode.data.keepAlive) {
+        componentInstance.$destroy();
+      } else {
+        deactivateChildComponent(componentInstance, true /* direct */);
+      }
     }
   }
-  if (vm._hasHookEvent) {
-    vm.$emit('hook:' + hook);
-  }
-  popTarget();
-}
+};
 
-/*  */
+var hooksToMerge = Object.keys(componentVNodeHooks);
 
-var MAX_UPDATE_COUNT = 100;
+function createComponent (
+  Ctor,
+  data,
+  context,
+  children,
+  tag
+) {
+  if (isUndef(Ctor)) {
+    return
+  }
 
-var queue = [];
-var activatedChildren = [];
-var has = {};
-var circular = {};
-var waiting = false;
-var flushing = false;
-var index = 0;
+  var baseCtor = context.$options._base;
 
-/**
- * Reset the scheduler's state.
- */
-function resetSchedulerState () {
-  index = queue.length = activatedChildren.length = 0;
-  has = {};
-  if (process.env.NODE_ENV !== 'production') {
-    circular = {};
+  // plain options object: turn it into a constructor
+  if (isObject(Ctor)) {
+    Ctor = baseCtor.extend(Ctor);
   }
-  waiting = flushing = false;
-}
 
-// Async edge case #6566 requires saving the timestamp when event listeners are
-// attached. However, calling performance.now() has a perf overhead especially
-// if the page has thousands of event listeners. Instead, we take a timestamp
-// every time the scheduler flushes and use that for all event listeners
-// attached during that flush.
-var currentFlushTimestamp = 0;
+  // if at this stage it's not a constructor or an async component factory,
+  // reject.
+  if (typeof Ctor !== 'function') {
+    if (process.env.NODE_ENV !== 'production') {
+      warn(("Invalid Component definition: " + (String(Ctor))), context);
+    }
+    return
+  }
 
-// Async edge case fix requires storing an event listener's attach timestamp.
-var getNow = Date.now;
+  // async component
+  var asyncFactory;
+  if (isUndef(Ctor.cid)) {
+    asyncFactory = Ctor;
+    Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+    if (Ctor === undefined) {
+      // return a placeholder node for async component, which is rendered
+      // as a comment node but preserves all the raw information for the node.
+      // the information will be used for async server-rendering and hydration.
+      return createAsyncPlaceholder(
+        asyncFactory,
+        data,
+        context,
+        children,
+        tag
+      )
+    }
+  }
 
-// Determine what event timestamp the browser is using. Annoyingly, the
-// timestamp can either be hi-res ( relative to poge load) or low-res
-// (relative to UNIX epoch), so in order to compare time we have to use the
-// same timestamp type when saving the flush timestamp.
-if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-  // if the low-res timestamp which is bigger than the event timestamp
-  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-  // and we need to use the hi-res version for event listeners as well.
-  getNow = function () { return performance.now(); };
-}
+  data = data || {};
 
-/**
- * Flush both queues and run the watchers.
- */
-function flushSchedulerQueue () {
-  currentFlushTimestamp = getNow();
-  flushing = true;
-  var watcher, id;
+  // resolve constructor options in case global mixins are applied after
+  // component constructor creation
+  resolveConstructorOptions(Ctor);
 
-  // Sort queue before flush.
-  // This ensures that:
-  // 1. Components are updated from parent to child. (because parent is always
-  //    created before the child)
-  // 2. A component's user watchers are run before its render watcher (because
-  //    user watchers are created before the render watcher)
-  // 3. If a component is destroyed during a parent component's watcher run,
-  //    its watchers can be skipped.
-  queue.sort(function (a, b) { return a.id - b.id; });
+  // transform component v-model data into props & events
+  if (isDef(data.model)) {
+    transformModel(Ctor.options, data);
+  }
 
-  // do not cache length because more watchers might be pushed
-  // as we run existing watchers
-  for (index = 0; index < queue.length; index++) {
-    watcher = queue[index];
-    if (watcher.before) {
-      watcher.before();
-    }
-    id = watcher.id;
-    has[id] = null;
-    watcher.run();
-    // in dev build, check and stop circular updates.
-    if (process.env.NODE_ENV !== 'production' && has[id] != null) {
-      circular[id] = (circular[id] || 0) + 1;
-      if (circular[id] > MAX_UPDATE_COUNT) {
-        warn(
-          'You may have an infinite update loop ' + (
-            watcher.user
-              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
-              : "in a component render function."
-          ),
-          watcher.vm
-        );
-        break
-      }
+  // extract props
+  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+
+  // functional component
+  if (isTrue(Ctor.options.functional)) {
+    return createFunctionalComponent(Ctor, propsData, data, context, children)
+  }
+
+  // extract listeners, since these needs to be treated as
+  // child component listeners instead of DOM listeners
+  var listeners = data.on;
+  // replace with listeners with .native modifier
+  // so it gets processed during parent component patch.
+  data.on = data.nativeOn;
+
+  if (isTrue(Ctor.options.abstract)) {
+    // abstract components do not keep anything
+    // other than props & listeners & slot
+
+    // work around flow
+    var slot = data.slot;
+    data = {};
+    if (slot) {
+      data.slot = slot;
     }
   }
 
-  // keep copies of post queues before resetting state
-  var activatedQueue = activatedChildren.slice();
-  var updatedQueue = queue.slice();
+  // install component management hooks onto the placeholder node
+  installComponentHooks(data);
 
-  resetSchedulerState();
+  // return a placeholder vnode
+  var name = Ctor.options.name || tag;
+  var vnode = new VNode(
+    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
+    data, undefined, undefined, undefined, context,
+    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
+    asyncFactory
+  );
 
-  // call component updated and activated hooks
-  callActivatedHooks(activatedQueue);
-  callUpdatedHooks(updatedQueue);
+  return vnode
+}
 
-  // devtool hook
-  /* istanbul ignore if */
-  if (devtools && config.devtools) {
-    devtools.emit('flush');
+function createComponentInstanceForVnode (
+  vnode, // we know it's MountedComponentVNode but flow doesn't
+  parent // activeInstance in lifecycle state
+) {
+  var options = {
+    _isComponent: true,
+    _parentVnode: vnode,
+    parent: parent
+  };
+  // check inline-template render functions
+  var inlineTemplate = vnode.data.inlineTemplate;
+  if (isDef(inlineTemplate)) {
+    options.render = inlineTemplate.render;
+    options.staticRenderFns = inlineTemplate.staticRenderFns;
   }
+  return new vnode.componentOptions.Ctor(options)
 }
 
-function callUpdatedHooks (queue) {
-  var i = queue.length;
-  while (i--) {
-    var watcher = queue[i];
-    var vm = watcher.vm;
-    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
-      callHook(vm, 'updated');
+function installComponentHooks (data) {
+  var hooks = data.hook || (data.hook = {});
+  for (var i = 0; i < hooksToMerge.length; i++) {
+    var key = hooksToMerge[i];
+    var existing = hooks[key];
+    var toMerge = componentVNodeHooks[key];
+    if (existing !== toMerge && !(existing && existing._merged)) {
+      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
     }
   }
 }
 
-/**
- * Queue a kept-alive component that was activated during patch.
- * The queue will be processed after the entire tree has been patched.
- */
-function queueActivatedComponent (vm) {
-  // setting _inactive to false here so that a render function can
-  // rely on checking whether it's in an inactive tree (e.g. router-view)
-  vm._inactive = false;
-  activatedChildren.push(vm);
-}
-
-function callActivatedHooks (queue) {
-  for (var i = 0; i < queue.length; i++) {
-    queue[i]._inactive = true;
-    activateChildComponent(queue[i], true /* true */);
-  }
+function mergeHook$1 (f1, f2) {
+  var merged = function (a, b) {
+    // flow complains about extra args which is why we use any
+    f1(a, b);
+    f2(a, b);
+  };
+  merged._merged = true;
+  return merged
 }
 
-/**
- * Push a watcher into the watcher queue.
- * Jobs with duplicate IDs will be skipped unless it's
- * pushed when the queue is being flushed.
- */
-function queueWatcher (watcher) {
-  var id = watcher.id;
-  if (has[id] == null) {
-    has[id] = true;
-    if (!flushing) {
-      queue.push(watcher);
-    } else {
-      // if already flushing, splice the watcher based on its id
-      // if already past its id, it will be run next immediately.
-      var i = queue.length - 1;
-      while (i > index && queue[i].id > watcher.id) {
-        i--;
-      }
-      queue.splice(i + 1, 0, watcher);
-    }
-    // queue the flush
-    if (!waiting) {
-      waiting = true;
-
-      if (process.env.NODE_ENV !== 'production' && !config.async) {
-        flushSchedulerQueue();
-        return
-      }
-      nextTick(flushSchedulerQueue);
+// transform component v-model info (value and callback) into
+// prop and event handler respectively.
+function transformModel (options, data) {
+  var prop = (options.model && options.model.prop) || 'value';
+  var event = (options.model && options.model.event) || 'input'
+  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+  var on = data.on || (data.on = {});
+  var existing = on[event];
+  var callback = data.model.callback;
+  if (isDef(existing)) {
+    if (
+      Array.isArray(existing)
+        ? existing.indexOf(callback) === -1
+        : existing !== callback
+    ) {
+      on[event] = [callback].concat(existing);
     }
+  } else {
+    on[event] = callback;
   }
 }
 
 /*  */
 
+var SIMPLE_NORMALIZE = 1;
+var ALWAYS_NORMALIZE = 2;
 
+// wrapper function for providing a more flexible interface
+// without getting yelled at by flow
+function createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType,
+  alwaysNormalize
+) {
+  if (Array.isArray(data) || isPrimitive(data)) {
+    normalizationType = children;
+    children = data;
+    data = undefined;
+  }
+  if (isTrue(alwaysNormalize)) {
+    normalizationType = ALWAYS_NORMALIZE;
+  }
+  return _createElement(context, tag, data, children, normalizationType)
+}
 
-var uid$1 = 0;
-
-/**
- * A watcher parses an expression, collects dependencies,
- * and fires callback when the expression value changes.
- * This is used for both the $watch() api and directives.
- */
-var Watcher = function Watcher (
-  vm,
-  expOrFn,
-  cb,
-  options,
-  isRenderWatcher
+function _createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType
 ) {
-  this.vm = vm;
-  if (isRenderWatcher) {
-    vm._watcher = this;
+  if (isDef(data) && isDef((data).__ob__)) {
+    process.env.NODE_ENV !== 'production' && warn(
+      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+      'Always create fresh vnode data objects in each render!',
+      context
+    );
+    return createEmptyVNode()
   }
-  vm._watchers.push(this);
-  // options
-  if (options) {
-    this.deep = !!options.deep;
-    this.user = !!options.user;
-    this.lazy = !!options.lazy;
-    this.sync = !!options.sync;
-    this.before = options.before;
+  // object syntax in v-bind
+  if (isDef(data) && isDef(data.is)) {
+    tag = data.is;
+  }
+  if (!tag) {
+    // in case of component :is set to falsy value
+    return createEmptyVNode()
+  }
+  // warn against non-primitive key
+  if (process.env.NODE_ENV !== 'production' &&
+    isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+  ) {
+    {
+      warn(
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
+      );
+    }
+  }
+  // support single function children as default scoped slot
+  if (Array.isArray(children) &&
+    typeof children[0] === 'function'
+  ) {
+    data = data || {};
+    data.scopedSlots = { default: children[0] };
+    children.length = 0;
+  }
+  if (normalizationType === ALWAYS_NORMALIZE) {
+    children = normalizeChildren(children);
+  } else if (normalizationType === SIMPLE_NORMALIZE) {
+    children = simpleNormalizeChildren(children);
+  }
+  var vnode, ns;
+  if (typeof tag === 'string') {
+    var Ctor;
+    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+    if (config.isReservedTag(tag)) {
+      // platform built-in elements
+      vnode = new VNode(
+        config.parsePlatformTagName(tag), data, children,
+        undefined, undefined, context
+      );
+    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+      // component
+      vnode = createComponent(Ctor, data, context, children, tag);
+    } else {
+      // unknown or unlisted namespaced elements
+      // check at runtime because it may get assigned a namespace when its
+      // parent normalizes children
+      vnode = new VNode(
+        tag, data, children,
+        undefined, undefined, context
+      );
+    }
   } else {
-    this.deep = this.user = this.lazy = this.sync = false;
+    // direct component options / constructor
+    vnode = createComponent(tag, data, context, children);
   }
-  this.cb = cb;
-  this.id = ++uid$1; // uid for batching
-  this.active = true;
-  this.dirty = this.lazy; // for lazy watchers
-  this.deps = [];
-  this.newDeps = [];
-  this.depIds = new _Set();
-  this.newDepIds = new _Set();
-  this.expression = process.env.NODE_ENV !== 'production'
-    ? expOrFn.toString()
-    : '';
-  // parse expression for getter
-  if (typeof expOrFn === 'function') {
-    this.getter = expOrFn;
+  if (Array.isArray(vnode)) {
+    return vnode
+  } else if (isDef(vnode)) {
+    if (isDef(ns)) { applyNS(vnode, ns); }
+    if (isDef(data)) { registerDeepBindings(data); }
+    return vnode
   } else {
-    this.getter = parsePath(expOrFn);
-    if (!this.getter) {
-      this.getter = noop;
-      process.env.NODE_ENV !== 'production' && warn(
-        "Failed watching path: \"" + expOrFn + "\" " +
-        'Watcher only accepts simple dot-delimited paths. ' +
-        'For full control, use a function instead.',
-        vm
-      );
-    }
+    return createEmptyVNode()
   }
-  this.value = this.lazy
-    ? undefined
-    : this.get();
-};
+}
 
-/**
- * Evaluate the getter, and re-collect dependencies.
- */
-Watcher.prototype.get = function get () {
-  pushTarget(this);
-  var value;
-  var vm = this.vm;
-  try {
-    value = this.getter.call(vm, vm);
-  } catch (e) {
-    if (this.user) {
-      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
-    } else {
-      throw e
-    }
-  } finally {
-    // "touch" every property so they are all tracked as
-    // dependencies for deep watching
-    if (this.deep) {
-      traverse(value);
-    }
-    popTarget();
-    this.cleanupDeps();
+function applyNS (vnode, ns, force) {
+  vnode.ns = ns;
+  if (vnode.tag === 'foreignObject') {
+    // use default namespace inside foreignObject
+    ns = undefined;
+    force = true;
   }
-  return value
-};
-
-/**
- * Add a dependency to this directive.
- */
-Watcher.prototype.addDep = function addDep (dep) {
-  var id = dep.id;
-  if (!this.newDepIds.has(id)) {
-    this.newDepIds.add(id);
-    this.newDeps.push(dep);
-    if (!this.depIds.has(id)) {
-      dep.addSub(this);
+  if (isDef(vnode.children)) {
+    for (var i = 0, l = vnode.children.length; i < l; i++) {
+      var child = vnode.children[i];
+      if (isDef(child.tag) && (
+        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+        applyNS(child, ns, force);
+      }
     }
   }
-};
+}
 
-/**
- * Clean up for dependency collection.
- */
-Watcher.prototype.cleanupDeps = function cleanupDeps () {
-  var i = this.deps.length;
-  while (i--) {
-    var dep = this.deps[i];
-    if (!this.newDepIds.has(dep.id)) {
-      dep.removeSub(this);
-    }
+// ref #5318
+// necessary to ensure parent re-render when deep bindings like :style and
+// :class are used on slot nodes
+function registerDeepBindings (data) {
+  if (isObject(data.style)) {
+    traverse(data.style);
   }
-  var tmp = this.depIds;
-  this.depIds = this.newDepIds;
-  this.newDepIds = tmp;
-  this.newDepIds.clear();
-  tmp = this.deps;
-  this.deps = this.newDeps;
-  this.newDeps = tmp;
-  this.newDeps.length = 0;
-};
+  if (isObject(data.class)) {
+    traverse(data.class);
+  }
+}
+
+/*  */
+
+function initRender (vm) {
+  vm._vnode = null; // the root of the child tree
+  vm._staticTrees = null; // v-once cached trees
+  var options = vm.$options;
+  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+  var renderContext = parentVnode && parentVnode.context;
+  vm.$slots = resolveSlots(options._renderChildren, renderContext);
+  vm.$scopedSlots = emptyObject;
+  // bind the createElement fn to this instance
+  // so that we get proper render context inside it.
+  // args order: tag, data, children, normalizationType, alwaysNormalize
+  // internal version is used by render functions compiled from templates
+  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
+  // normalization is always applied for the public version, used in
+  // user-written render functions.
+  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+
+  // $attrs & $listeners are exposed for easier HOC creation.
+  // they need to be reactive so that HOCs using them are always updated
+  var parentData = parentVnode && parentVnode.data;
 
-/**
- * Subscriber interface.
- * Will be called when a dependency changes.
- */
-Watcher.prototype.update = function update () {
   /* istanbul ignore else */
-  if (this.lazy) {
-    this.dirty = true;
-  } else if (this.sync) {
-    this.run();
+  if (process.env.NODE_ENV !== 'production') {
+    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
+    }, true);
+    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
+      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
+    }, true);
   } else {
-    queueWatcher(this);
+    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, null, true);
+    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, null, true);
   }
-};
+}
 
-/**
- * Scheduler job interface.
- * Will be called by the scheduler.
- */
-Watcher.prototype.run = function run () {
-  if (this.active) {
-    var value = this.get();
-    if (
-      value !== this.value ||
-      // Deep watchers and watchers on Object/Arrays should fire even
-      // when the value is the same, because the value may
-      // have mutated.
-      isObject(value) ||
-      this.deep
-    ) {
-      // set new value
-      var oldValue = this.value;
-      this.value = value;
-      if (this.user) {
-        try {
-          this.cb.call(this.vm, value, oldValue);
-        } catch (e) {
-          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
-        }
-      } else {
-        this.cb.call(this.vm, value, oldValue);
-      }
-    }
-  }
-};
+var currentRenderingInstance = null;
 
-/**
- * Evaluate the value of the watcher.
- * This only gets called for lazy watchers.
- */
-Watcher.prototype.evaluate = function evaluate () {
-  this.value = this.get();
-  this.dirty = false;
-};
+function renderMixin (Vue) {
+  // install runtime convenience helpers
+  installRenderHelpers(Vue.prototype);
 
-/**
- * Depend on all deps collected by this watcher.
- */
-Watcher.prototype.depend = function depend () {
-  var i = this.deps.length;
-  while (i--) {
-    this.deps[i].depend();
-  }
-};
+  Vue.prototype.$nextTick = function (fn) {
+    return nextTick(fn, this)
+  };
 
-/**
- * Remove self from all dependencies' subscriber list.
- */
-Watcher.prototype.teardown = function teardown () {
-  if (this.active) {
-    // remove self from vm's watcher list
-    // this is a somewhat expensive operation so we skip it
-    // if the vm is being destroyed.
-    if (!this.vm._isBeingDestroyed) {
-      remove(this.vm._watchers, this);
+  Vue.prototype._render = function () {
+    var vm = this;
+    var ref = vm.$options;
+    var render = ref.render;
+    var _parentVnode = ref._parentVnode;
+
+    if (_parentVnode) {
+      vm.$scopedSlots = normalizeScopedSlots(
+        _parentVnode.data.scopedSlots,
+        vm.$slots
+      );
+    }
+
+    // set parent vnode. this allows render functions to have access
+    // to the data on the placeholder node.
+    vm.$vnode = _parentVnode;
+    // render self
+    var vnode;
+    try {
+      // There's no need to maintain a stack becaues all render fns are called
+      // separately from one another. Nested component's render fns are called
+      // when parent component is patched.
+      currentRenderingInstance = vm;
+      vnode = render.call(vm._renderProxy, vm.$createElement);
+    } catch (e) {
+      handleError(e, vm, "render");
+      // return error render result,
+      // or previous vnode to prevent render error causing blank component
+      /* istanbul ignore else */
+      if (process.env.NODE_ENV !== 'production' && vm.$options.renderError) {
+        try {
+          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+        } catch (e) {
+          handleError(e, vm, "renderError");
+          vnode = vm._vnode;
+        }
+      } else {
+        vnode = vm._vnode;
+      }
+    } finally {
+      currentRenderingInstance = null;
     }
-    var i = this.deps.length;
-    while (i--) {
-      this.deps[i].removeSub(this);
+    // if the returned array contains only a single node, allow it
+    if (Array.isArray(vnode) && vnode.length === 1) {
+      vnode = vnode[0];
     }
-    this.active = false;
-  }
-};
+    // return empty vnode in case the render function errored out
+    if (!(vnode instanceof VNode)) {
+      if (process.env.NODE_ENV !== 'production' && Array.isArray(vnode)) {
+        warn(
+          'Multiple root nodes returned from render function. Render function ' +
+          'should return a single root node.',
+          vm
+        );
+      }
+      vnode = createEmptyVNode();
+    }
+    // set parent
+    vnode.parent = _parentVnode;
+    return vnode
+  };
+}
 
 /*  */
 
-var sharedPropertyDefinition = {
-  enumerable: true,
-  configurable: true,
-  get: noop,
-  set: noop
-};
+function ensureCtor (comp, base) {
+  if (
+    comp.__esModule ||
+    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+  ) {
+    comp = comp.default;
+  }
+  return isObject(comp)
+    ? base.extend(comp)
+    : comp
+}
 
-function proxy (target, sourceKey, key) {
-  sharedPropertyDefinition.get = function proxyGetter () {
-    return this[sourceKey][key]
-  };
-  sharedPropertyDefinition.set = function proxySetter (val) {
-    this[sourceKey][key] = val;
-  };
-  Object.defineProperty(target, key, sharedPropertyDefinition);
+function createAsyncPlaceholder (
+  factory,
+  data,
+  context,
+  children,
+  tag
+) {
+  var node = createEmptyVNode();
+  node.asyncFactory = factory;
+  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+  return node
 }
 
-function initState (vm) {
-  vm._watchers = [];
-  var opts = vm.$options;
-  if (opts.props) { initProps(vm, opts.props); }
-  if (opts.methods) { initMethods(vm, opts.methods); }
-  if (opts.data) {
-    initData(vm);
-  } else {
-    observe(vm._data = {}, true /* asRootData */);
+function resolveAsyncComponent (
+  factory,
+  baseCtor
+) {
+  if (isTrue(factory.error) && isDef(factory.errorComp)) {
+    return factory.errorComp
   }
-  if (opts.computed) { initComputed(vm, opts.computed); }
-  if (opts.watch && opts.watch !== nativeWatch) {
-    initWatch(vm, opts.watch);
+
+  if (isDef(factory.resolved)) {
+    return factory.resolved
   }
-}
 
-function initProps (vm, propsOptions) {
-  var propsData = vm.$options.propsData || {};
-  var props = vm._props = {};
-  // cache prop keys so that future props updates can iterate using Array
-  // instead of dynamic object key enumeration.
-  var keys = vm.$options._propKeys = [];
-  var isRoot = !vm.$parent;
-  // root instance props should be converted
-  if (!isRoot) {
-    toggleObserving(false);
+  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+    return factory.loadingComp
   }
-  var loop = function ( key ) {
-    keys.push(key);
-    var value = validateProp(key, propsOptions, propsData, vm);
-    /* istanbul ignore else */
-    if (process.env.NODE_ENV !== 'production') {
-      var hyphenatedKey = hyphenate(key);
-      if (isReservedAttribute(hyphenatedKey) ||
-          config.isReservedAttr(hyphenatedKey)) {
-        warn(
-          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
-          vm
-        );
+
+  var owner = currentRenderingInstance;
+  if (isDef(factory.owners)) {
+    // already pending
+    factory.owners.push(owner);
+  } else {
+    var owners = factory.owners = [owner];
+    var sync = true;
+
+    var forceRender = function (renderCompleted) {
+      for (var i = 0, l = owners.length; i < l; i++) {
+        (owners[i]).$forceUpdate();
       }
-      defineReactive$$1(props, key, value, function () {
-        if (!isRoot && !isUpdatingChildComponent) {
-          warn(
-            "Avoid mutating a prop directly since the value will be " +
-            "overwritten whenever the parent component re-renders. " +
-            "Instead, use a data or computed property based on the prop's " +
-            "value. Prop being mutated: \"" + key + "\"",
-            vm
-          );
-        }
-      });
-    } else {
-      defineReactive$$1(props, key, value);
-    }
-    // static props are already proxied on the component's prototype
-    // during Vue.extend(). We only need to proxy props defined at
-    // instantiation here.
-    if (!(key in vm)) {
-      proxy(vm, "_props", key);
-    }
-  };
 
-  for (var key in propsOptions) loop( key );
-  toggleObserving(true);
-}
+      if (renderCompleted) {
+        owners.length = 0;
+      }
+    };
 
-function initData (vm) {
-  var data = vm.$options.data;
-  data = vm._data = typeof data === 'function'
-    ? getData(data, vm)
-    : data || {};
-  if (!isPlainObject(data)) {
-    data = {};
-    process.env.NODE_ENV !== 'production' && warn(
-      'data functions should return an object:\n' +
-      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
-      vm
-    );
-  }
-  // proxy data on instance
-  var keys = Object.keys(data);
-  var props = vm.$options.props;
-  var methods = vm.$options.methods;
-  var i = keys.length;
-  while (i--) {
-    var key = keys[i];
-    if (process.env.NODE_ENV !== 'production') {
-      if (methods && hasOwn(methods, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a data property."),
-          vm
-        );
+    var resolve = once(function (res) {
+      // cache resolved
+      factory.resolved = ensureCtor(res, baseCtor);
+      // invoke callbacks only if this is not a synchronous resolve
+      // (async resolves are shimmed as synchronous during SSR)
+      if (!sync) {
+        forceRender(true);
+      } else {
+        owners.length = 0;
       }
-    }
-    if (props && hasOwn(props, key)) {
+    });
+
+    var reject = once(function (reason) {
       process.env.NODE_ENV !== 'production' && warn(
-        "The data property \"" + key + "\" is already declared as a prop. " +
-        "Use prop default value instead.",
-        vm
+        "Failed to resolve async component: " + (String(factory)) +
+        (reason ? ("\nReason: " + reason) : '')
       );
-    } else if (!isReserved(key)) {
-      proxy(vm, "_data", key);
+      if (isDef(factory.errorComp)) {
+        factory.error = true;
+        forceRender(true);
+      }
+    });
+
+    var res = factory(resolve, reject);
+
+    if (isObject(res)) {
+      if (isPromise(res)) {
+        // () => Promise
+        if (isUndef(factory.resolved)) {
+          res.then(resolve, reject);
+        }
+      } else if (isPromise(res.component)) {
+        res.component.then(resolve, reject);
+
+        if (isDef(res.error)) {
+          factory.errorComp = ensureCtor(res.error, baseCtor);
+        }
+
+        if (isDef(res.loading)) {
+          factory.loadingComp = ensureCtor(res.loading, baseCtor);
+          if (res.delay === 0) {
+            factory.loading = true;
+          } else {
+            setTimeout(function () {
+              if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                factory.loading = true;
+                forceRender(false);
+              }
+            }, res.delay || 200);
+          }
+        }
+
+        if (isDef(res.timeout)) {
+          setTimeout(function () {
+            if (isUndef(factory.resolved)) {
+              reject(
+                process.env.NODE_ENV !== 'production'
+                  ? ("timeout (" + (res.timeout) + "ms)")
+                  : null
+              );
+            }
+          }, res.timeout);
+        }
+      }
     }
-  }
-  // observe data
-  observe(data, true /* asRootData */);
-}
 
-function getData (data, vm) {
-  // #7573 disable dep collection when invoking data getters
-  pushTarget();
-  try {
-    return data.call(vm, vm)
-  } catch (e) {
-    handleError(e, vm, "data()");
-    return {}
-  } finally {
-    popTarget();
+    sync = false;
+    // return in case resolved synchronously
+    return factory.loading
+      ? factory.loadingComp
+      : factory.resolved
   }
 }
 
-var computedWatcherOptions = { lazy: true };
-
-function initComputed (vm, computed) {
-  // $flow-disable-line
-  var watchers = vm._computedWatchers = Object.create(null);
-  // computed properties are just getters during SSR
-  var isSSR = isServerRendering();
+/*  */
 
-  for (var key in computed) {
-    var userDef = computed[key];
-    var getter = typeof userDef === 'function' ? userDef : userDef.get;
-    if (process.env.NODE_ENV !== 'production' && getter == null) {
-      warn(
-        ("Getter is missing for computed property \"" + key + "\"."),
-        vm
-      );
-    }
+function isAsyncPlaceholder (node) {
+  return node.isComment && node.asyncFactory
+}
 
-    if (!isSSR) {
-      // create internal watcher for the computed property.
-      watchers[key] = new Watcher(
-        vm,
-        getter || noop,
-        noop,
-        computedWatcherOptions
-      );
-    }
+/*  */
 
-    // component-defined computed properties are already defined on the
-    // component prototype. We only need to define computed properties defined
-    // at instantiation here.
-    if (!(key in vm)) {
-      defineComputed(vm, key, userDef);
-    } else if (process.env.NODE_ENV !== 'production') {
-      if (key in vm.$data) {
-        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
-      } else if (vm.$options.props && key in vm.$options.props) {
-        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+function getFirstComponentChild (children) {
+  if (Array.isArray(children)) {
+    for (var i = 0; i < children.length; i++) {
+      var c = children[i];
+      if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+        return c
       }
     }
   }
 }
 
-function defineComputed (
-  target,
-  key,
-  userDef
-) {
-  var shouldCache = !isServerRendering();
-  if (typeof userDef === 'function') {
-    sharedPropertyDefinition.get = shouldCache
-      ? createComputedGetter(key)
-      : createGetterInvoker(userDef);
-    sharedPropertyDefinition.set = noop;
-  } else {
-    sharedPropertyDefinition.get = userDef.get
-      ? shouldCache && userDef.cache !== false
-        ? createComputedGetter(key)
-        : createGetterInvoker(userDef.get)
-      : noop;
-    sharedPropertyDefinition.set = userDef.set || noop;
-  }
-  if (process.env.NODE_ENV !== 'production' &&
-      sharedPropertyDefinition.set === noop) {
-    sharedPropertyDefinition.set = function () {
-      warn(
-        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
-        this
-      );
-    };
-  }
-  Object.defineProperty(target, key, sharedPropertyDefinition);
-}
+/*  */
 
-function createComputedGetter (key) {
-  return function computedGetter () {
-    var watcher = this._computedWatchers && this._computedWatchers[key];
-    if (watcher) {
-      if (watcher.dirty) {
-        watcher.evaluate();
-      }
-      if (Dep.target) {
-        watcher.depend();
-      }
-      return watcher.value
-    }
+/*  */
+
+function initEvents (vm) {
+  vm._events = Object.create(null);
+  vm._hasHookEvent = false;
+  // init parent attached events
+  var listeners = vm.$options._parentListeners;
+  if (listeners) {
+    updateComponentListeners(vm, listeners);
   }
 }
 
-function createGetterInvoker(fn) {
-  return function computedGetter () {
-    return fn.call(this, this)
-  }
+var target;
+
+function add (event, fn) {
+  target.$on(event, fn);
 }
 
-function initMethods (vm, methods) {
-  var props = vm.$options.props;
-  for (var key in methods) {
-    if (process.env.NODE_ENV !== 'production') {
-      if (typeof methods[key] !== 'function') {
-        warn(
-          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
-          "Did you reference the function correctly?",
-          vm
-        );
-      }
-      if (props && hasOwn(props, key)) {
-        warn(
-          ("Method \"" + key + "\" has already been defined as a prop."),
-          vm
-        );
-      }
-      if ((key in vm) && isReserved(key)) {
-        warn(
-          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
-          "Avoid defining component methods that start with _ or $."
-        );
-      }
-    }
-    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
-  }
+function remove$1 (event, fn) {
+  target.$off(event, fn);
 }
 
-function initWatch (vm, watch) {
-  for (var key in watch) {
-    var handler = watch[key];
-    if (Array.isArray(handler)) {
-      for (var i = 0; i < handler.length; i++) {
-        createWatcher(vm, key, handler[i]);
-      }
-    } else {
-      createWatcher(vm, key, handler);
+function createOnceHandler (event, fn) {
+  var _target = target;
+  return function onceHandler () {
+    var res = fn.apply(null, arguments);
+    if (res !== null) {
+      _target.$off(event, onceHandler);
     }
   }
 }
 
-function createWatcher (
+function updateComponentListeners (
   vm,
-  expOrFn,
-  handler,
-  options
+  listeners,
+  oldListeners
 ) {
-  if (isPlainObject(handler)) {
-    options = handler;
-    handler = handler.handler;
-  }
-  if (typeof handler === 'string') {
-    handler = vm[handler];
-  }
-  return vm.$watch(expOrFn, handler, options)
+  target = vm;
+  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+  target = undefined;
 }
 
-function stateMixin (Vue) {
-  // flow somehow has problems with directly declared definition object
-  // when using Object.defineProperty, so we have to procedurally build up
-  // the object here.
-  var dataDef = {};
-  dataDef.get = function () { return this._data };
-  var propsDef = {};
-  propsDef.get = function () { return this._props };
-  if (process.env.NODE_ENV !== 'production') {
-    dataDef.set = function () {
-      warn(
-        'Avoid replacing instance root $data. ' +
-        'Use nested data properties instead.',
-        this
-      );
-    };
-    propsDef.set = function () {
-      warn("$props is readonly.", this);
-    };
-  }
-  Object.defineProperty(Vue.prototype, '$data', dataDef);
-  Object.defineProperty(Vue.prototype, '$props', propsDef);
+function eventsMixin (Vue) {
+  var hookRE = /^hook:/;
+  Vue.prototype.$on = function (event, fn) {
+    var vm = this;
+    if (Array.isArray(event)) {
+      for (var i = 0, l = event.length; i < l; i++) {
+        vm.$on(event[i], fn);
+      }
+    } else {
+      (vm._events[event] || (vm._events[event] = [])).push(fn);
+      // optimize hook:event cost by using a boolean flag marked at registration
+      // instead of a hash lookup
+      if (hookRE.test(event)) {
+        vm._hasHookEvent = true;
+      }
+    }
+    return vm
+  };
 
-  Vue.prototype.$set = set;
-  Vue.prototype.$delete = del;
+  Vue.prototype.$once = function (event, fn) {
+    var vm = this;
+    function on () {
+      vm.$off(event, on);
+      fn.apply(vm, arguments);
+    }
+    on.fn = fn;
+    vm.$on(event, on);
+    return vm
+  };
 
-  Vue.prototype.$watch = function (
-    expOrFn,
-    cb,
-    options
-  ) {
+  Vue.prototype.$off = function (event, fn) {
     var vm = this;
-    if (isPlainObject(cb)) {
-      return createWatcher(vm, expOrFn, cb, options)
+    // all
+    if (!arguments.length) {
+      vm._events = Object.create(null);
+      return vm
+    }
+    // array of events
+    if (Array.isArray(event)) {
+      for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
+        vm.$off(event[i$1], fn);
+      }
+      return vm
+    }
+    // specific event
+    var cbs = vm._events[event];
+    if (!cbs) {
+      return vm
+    }
+    if (!fn) {
+      vm._events[event] = null;
+      return vm
+    }
+    // specific handler
+    var cb;
+    var i = cbs.length;
+    while (i--) {
+      cb = cbs[i];
+      if (cb === fn || cb.fn === fn) {
+        cbs.splice(i, 1);
+        break
+      }
     }
-    options = options || {};
-    options.user = true;
-    var watcher = new Watcher(vm, expOrFn, cb, options);
-    if (options.immediate) {
-      try {
-        cb.call(vm, watcher.value);
-      } catch (error) {
-        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
+    return vm
+  };
+
+  Vue.prototype.$emit = function (event) {
+    var vm = this;
+    if (process.env.NODE_ENV !== 'production') {
+      var lowerCaseEvent = event.toLowerCase();
+      if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+        tip(
+          "Event \"" + lowerCaseEvent + "\" is emitted in component " +
+          (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
+          "Note that HTML attributes are case-insensitive and you cannot use " +
+          "v-on to listen to camelCase events when using in-DOM templates. " +
+          "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
+        );
       }
     }
-    return function unwatchFn () {
-      watcher.teardown();
+    var cbs = vm._events[event];
+    if (cbs) {
+      cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+      var args = toArray(arguments, 1);
+      var info = "event handler for \"" + event + "\"";
+      for (var i = 0, l = cbs.length; i < l; i++) {
+        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+      }
     }
+    return vm
   };
 }
 
 /*  */
 
-function initProvide (vm) {
-  var provide = vm.$options.provide;
-  if (provide) {
-    vm._provided = typeof provide === 'function'
-      ? provide.call(vm)
-      : provide;
-  }
-}
+var activeInstance = null;
+var isUpdatingChildComponent = false;
 
-function initInjections (vm) {
-  var result = resolveInject(vm.$options.inject, vm);
-  if (result) {
-    toggleObserving(false);
-    Object.keys(result).forEach(function (key) {
-      /* istanbul ignore else */
-      if (process.env.NODE_ENV !== 'production') {
-        defineReactive$$1(vm, key, result[key], function () {
-          warn(
-            "Avoid mutating an injected value directly since the changes will be " +
-            "overwritten whenever the provided component re-renders. " +
-            "injection being mutated: \"" + key + "\"",
-            vm
-          );
-        });
-      } else {
-        defineReactive$$1(vm, key, result[key]);
-      }
-    });
-    toggleObserving(true);
+function setActiveInstance(vm) {
+  var prevActiveInstance = activeInstance;
+  activeInstance = vm;
+  return function () {
+    activeInstance = prevActiveInstance;
   }
 }
 
-function resolveInject (inject, vm) {
-  if (inject) {
-    // inject is :any because flow is not smart enough to figure out cached
-    var result = Object.create(null);
-    var keys = hasSymbol
-      ? Reflect.ownKeys(inject)
-      : Object.keys(inject);
+function initLifecycle (vm) {
+  var options = vm.$options;
 
-    for (var i = 0; i < keys.length; i++) {
-      var key = keys[i];
-      // #6574 in case the inject object is observed...
-      if (key === '__ob__') { continue }
-      var provideKey = inject[key].from;
-      var source = vm;
-      while (source) {
-        if (source._provided && hasOwn(source._provided, provideKey)) {
-          result[key] = source._provided[provideKey];
-          break
-        }
-        source = source.$parent;
-      }
-      if (!source) {
-        if ('default' in inject[key]) {
-          var provideDefault = inject[key].default;
-          result[key] = typeof provideDefault === 'function'
-            ? provideDefault.call(vm)
-            : provideDefault;
-        } else if (process.env.NODE_ENV !== 'production') {
-          warn(("Injection \"" + key + "\" not found"), vm);
-        }
-      }
+  // locate first non-abstract parent
+  var parent = options.parent;
+  if (parent && !options.abstract) {
+    while (parent.$options.abstract && parent.$parent) {
+      parent = parent.$parent;
     }
-    return result
+    parent.$children.push(vm);
   }
-}
 
-/*  */
-
-function normalizeScopedSlots (
-  slots,
-  normalSlots
-) {
-  var res;
-  if (!slots) {
-    res = {};
-  } else if (slots._normalized) {
-    return slots
-  } else {
-    res = {};
-    for (var key in slots) {
-      if (slots[key] && key[0] !== '$') {
-        res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-      }
-    }
-  }
-  // expose normal slots on scopedSlots
-  for (var key$1 in normalSlots) {
-    if (!(key$1 in res)) {
-      res[key$1] = proxyNormalSlot(normalSlots, key$1);
-    }
-  }
-  res._normalized = true;
-  res.$stable = slots ? slots.$stable : true;
-  return res
-}
+  vm.$parent = parent;
+  vm.$root = parent ? parent.$root : vm;
 
-function normalizeScopedSlot(normalSlots, key, fn) {
-  var normalized = function (scope) {
-    if ( scope === void 0 ) scope = {};
+  vm.$children = [];
+  vm.$refs = {};
 
-    var res = fn(scope);
-    return res && typeof res === 'object' && !Array.isArray(res)
-      ? [res] // single vnode
-      : normalizeChildren(res)
-  };
-  // proxy scoped slots on normal $slots
-  if (!hasOwn(normalSlots, key)) {
-    Object.defineProperty(normalSlots, key, {
-      get: normalized
-    });
-  }
-  return normalized
+  vm._watcher = null;
+  vm._inactive = null;
+  vm._directInactive = false;
+  vm._isMounted = false;
+  vm._isDestroyed = false;
+  vm._isBeingDestroyed = false;
 }
 
-function proxyNormalSlot(slots, key) {
-  return function () { return slots[key]; }
-}
+function lifecycleMixin (Vue) {
+  Vue.prototype._update = function (vnode, hydrating) {
+    var vm = this;
+    var prevEl = vm.$el;
+    var prevVnode = vm._vnode;
+    var restoreActiveInstance = setActiveInstance(vm);
+    vm._vnode = vnode;
+    // Vue.prototype.__patch__ is injected in entry points
+    // based on the rendering backend used.
+    if (!prevVnode) {
+      // initial render
+      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+    } else {
+      // updates
+      vm.$el = vm.__patch__(prevVnode, vnode);
+    }
+    restoreActiveInstance();
+    // update __vue__ reference
+    if (prevEl) {
+      prevEl.__vue__ = null;
+    }
+    if (vm.$el) {
+      vm.$el.__vue__ = vm;
+    }
+    // if parent is an HOC, update its $el as well
+    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+      vm.$parent.$el = vm.$el;
+    }
+    // updated hook is called by the scheduler to ensure that children are
+    // updated in a parent's updated hook.
+  };
 
-/*  */
+  Vue.prototype.$forceUpdate = function () {
+    var vm = this;
+    if (vm._watcher) {
+      vm._watcher.update();
+    }
+  };
 
-/**
- * Runtime helper for rendering v-for lists.
- */
-function renderList (
-  val,
-  render
-) {
-  var ret, i, l, keys, key;
-  if (Array.isArray(val) || typeof val === 'string') {
-    ret = new Array(val.length);
-    for (i = 0, l = val.length; i < l; i++) {
-      ret[i] = render(val[i], i);
+  Vue.prototype.$destroy = function () {
+    var vm = this;
+    if (vm._isBeingDestroyed) {
+      return
     }
-  } else if (typeof val === 'number') {
-    ret = new Array(val);
-    for (i = 0; i < val; i++) {
-      ret[i] = render(i + 1, i);
+    callHook(vm, 'beforeDestroy');
+    vm._isBeingDestroyed = true;
+    // remove self from parent
+    var parent = vm.$parent;
+    if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+      remove(parent.$children, vm);
     }
-  } else if (isObject(val)) {
-    if (hasSymbol && val[Symbol.iterator]) {
-      ret = [];
-      var iterator = val[Symbol.iterator]();
-      var result = iterator.next();
-      while (!result.done) {
-        ret.push(render(result.value, ret.length));
-        result = iterator.next();
-      }
-    } else {
-      keys = Object.keys(val);
-      ret = new Array(keys.length);
-      for (i = 0, l = keys.length; i < l; i++) {
-        key = keys[i];
-        ret[i] = render(val[key], key, i);
-      }
+    // teardown watchers
+    if (vm._watcher) {
+      vm._watcher.teardown();
+    }
+    var i = vm._watchers.length;
+    while (i--) {
+      vm._watchers[i].teardown();
+    }
+    // remove reference from data ob
+    // frozen object may not have observer.
+    if (vm._data.__ob__) {
+      vm._data.__ob__.vmCount--;
+    }
+    // call the last hook...
+    vm._isDestroyed = true;
+    // invoke destroy hooks on current rendered tree
+    vm.__patch__(vm._vnode, null);
+    // fire destroyed hook
+    callHook(vm, 'destroyed');
+    // turn off all instance listeners.
+    vm.$off();
+    // remove __vue__ reference
+    if (vm.$el) {
+      vm.$el.__vue__ = null;
     }
-  }
-  if (!isDef(ret)) {
-    ret = [];
-  }
-  (ret)._isVList = true;
-  return ret
+    // release circular reference (#6759)
+    if (vm.$vnode) {
+      vm.$vnode.parent = null;
+    }
+  };
 }
 
-/*  */
-
-/**
- * Runtime helper for rendering <slot>
- */
-function renderSlot (
-  name,
-  fallback,
-  props,
-  bindObject
+function mountComponent (
+  vm,
+  el,
+  hydrating
 ) {
-  var scopedSlotFn = this.$scopedSlots[name];
-  var nodes;
-  if (scopedSlotFn) { // scoped slot
-    props = props || {};
-    if (bindObject) {
-      if (process.env.NODE_ENV !== 'production' && !isObject(bindObject)) {
+  vm.$el = el;
+  if (!vm.$options.render) {
+    vm.$options.render = createEmptyVNode;
+    if (process.env.NODE_ENV !== 'production') {
+      /* istanbul ignore if */
+      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+        vm.$options.el || el) {
         warn(
-          'slot v-bind without argument expects an Object',
-          this
+          'You are using the runtime-only build of Vue where the template ' +
+          'compiler is not available. Either pre-compile the templates into ' +
+          'render functions, or use the compiler-included build.',
+          vm
+        );
+      } else {
+        warn(
+          'Failed to mount component: template or render function not defined.',
+          vm
         );
       }
-      props = extend(extend({}, bindObject), props);
     }
-    nodes = scopedSlotFn(props) || fallback;
-  } else {
-    nodes = this.$slots[name] || fallback;
   }
+  callHook(vm, 'beforeMount');
 
-  var target = props && props.slot;
-  if (target) {
-    return this.$createElement('template', { slot: target }, nodes)
-  } else {
-    return nodes
-  }
-}
+  var updateComponent;
+  /* istanbul ignore if */
+  if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
+    updateComponent = function () {
+      var name = vm._name;
+      var id = vm._uid;
+      var startTag = "vue-perf-start:" + id;
+      var endTag = "vue-perf-end:" + id;
 
-/*  */
+      mark(startTag);
+      var vnode = vm._render();
+      mark(endTag);
+      measure(("vue " + name + " render"), startTag, endTag);
 
-/**
- * Runtime helper for resolving filters
- */
-function resolveFilter (id) {
-  return resolveAsset(this.$options, 'filters', id, true) || identity
-}
+      mark(startTag);
+      vm._update(vnode, hydrating);
+      mark(endTag);
+      measure(("vue " + name + " patch"), startTag, endTag);
+    };
+  } else {
+    updateComponent = function () {
+      vm._update(vm._render(), hydrating);
+    };
+  }
 
-/*  */
+  // we set this to vm._watcher inside the watcher's constructor
+  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+  // component's mounted hook), which relies on vm._watcher being already defined
+  new Watcher(vm, updateComponent, noop, {
+    before: function before () {
+      if (vm._isMounted && !vm._isDestroyed) {
+        callHook(vm, 'beforeUpdate');
+      }
+    }
+  }, true /* isRenderWatcher */);
+  hydrating = false;
 
-function isKeyNotMatch (expect, actual) {
-  if (Array.isArray(expect)) {
-    return expect.indexOf(actual) === -1
-  } else {
-    return expect !== actual
+  // manually mounted instance, call mounted on self
+  // mounted is called for render-created child components in its inserted hook
+  if (vm.$vnode == null) {
+    vm._isMounted = true;
+    callHook(vm, 'mounted');
   }
+  return vm
 }
 
-/**
- * Runtime helper for checking keyCodes from config.
- * exposed as Vue.prototype._k
- * passing in eventKeyName as last argument separately for backwards compat
- */
-function checkKeyCodes (
-  eventKeyCode,
-  key,
-  builtInKeyCode,
-  eventKeyName,
-  builtInKeyName
+function updateChildComponent (
+  vm,
+  propsData,
+  listeners,
+  parentVnode,
+  renderChildren
 ) {
-  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-    return isKeyNotMatch(builtInKeyName, eventKeyName)
-  } else if (mappedKeyCode) {
-    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-  } else if (eventKeyName) {
-    return hyphenate(eventKeyName) !== key
+  if (process.env.NODE_ENV !== 'production') {
+    isUpdatingChildComponent = true;
   }
-}
-
-/*  */
 
-/**
- * Runtime helper for merging v-bind="object" into a VNode's data.
- */
-function bindObjectProps (
-  data,
-  tag,
-  value,
-  asProp,
-  isSync
-) {
-  if (value) {
-    if (!isObject(value)) {
-      process.env.NODE_ENV !== 'production' && warn(
-        'v-bind without argument expects an Object or Array value',
-        this
-      );
-    } else {
-      if (Array.isArray(value)) {
-        value = toObject(value);
-      }
-      var hash;
-      var loop = function ( key ) {
-        if (
-          key === 'class' ||
-          key === 'style' ||
-          isReservedAttribute(key)
-        ) {
-          hash = data;
-        } else {
-          var type = data.attrs && data.attrs.type;
-          hash = asProp || config.mustUseProp(tag, type, key)
-            ? data.domProps || (data.domProps = {})
-            : data.attrs || (data.attrs = {});
-        }
-        var camelizedKey = camelize(key);
-        if (!(key in hash) && !(camelizedKey in hash)) {
-          hash[key] = value[key];
+  // determine whether component has slot children
+  // we need to do this before overwriting $options._renderChildren.
 
-          if (isSync) {
-            var on = data.on || (data.on = {});
-            on[("update:" + camelizedKey)] = function ($event) {
-              value[key] = $event;
-            };
-          }
-        }
-      };
+  // check if there are dynamic scopedSlots (hand-written or compiled but with
+  // dynamic slot names). Static scoped slots compiled from template has the
+  // "$stable" marker.
+  var hasDynamicScopedSlot = !!(
+    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+  );
 
-      for (var key in value) loop( key );
-    }
-  }
-  return data
-}
+  // Any static slot children from the parent may have changed during parent's
+  // update. Dynamic scoped slots may also have changed. In such cases, a forced
+  // update is necessary to ensure correctness.
+  var needsForceUpdate = !!(
+    renderChildren ||               // has new static slots
+    vm.$options._renderChildren ||  // has old static slots
+    hasDynamicScopedSlot
+  );
 
-/*  */
+  vm.$options._parentVnode = parentVnode;
+  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
 
-/**
- * Runtime helper for rendering static trees.
- */
-function renderStatic (
-  index,
-  isInFor
-) {
-  var cached = this._staticTrees || (this._staticTrees = []);
-  var tree = cached[index];
-  // if has already-rendered static tree and not inside v-for,
-  // we can reuse the same tree.
-  if (tree && !isInFor) {
-    return tree
+  if (vm._vnode) { // update child tree's parent
+    vm._vnode.parent = parentVnode;
   }
-  // otherwise, render a fresh tree.
-  tree = cached[index] = this.$options.staticRenderFns[index].call(
-    this._renderProxy,
-    null,
-    this // for render fns generated for functional component templates
-  );
-  markStatic(tree, ("__static__" + index), false);
-  return tree
-}
+  vm.$options._renderChildren = renderChildren;
 
-/**
- * Runtime helper for v-once.
- * Effectively it means marking the node as static with a unique key.
- */
-function markOnce (
-  tree,
-  index,
-  key
-) {
-  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-  return tree
-}
+  // update $attrs and $listeners hash
+  // these are also reactive so they may trigger child update if the child
+  // used them during render
+  vm.$attrs = parentVnode.data.attrs || emptyObject;
+  vm.$listeners = listeners || emptyObject;
 
-function markStatic (
-  tree,
-  key,
-  isOnce
-) {
-  if (Array.isArray(tree)) {
-    for (var i = 0; i < tree.length; i++) {
-      if (tree[i] && typeof tree[i] !== 'string') {
-        markStaticNode(tree[i], (key + "_" + i), isOnce);
-      }
+  // update props
+  if (propsData && vm.$options.props) {
+    toggleObserving(false);
+    var props = vm._props;
+    var propKeys = vm.$options._propKeys || [];
+    for (var i = 0; i < propKeys.length; i++) {
+      var key = propKeys[i];
+      var propOptions = vm.$options.props; // wtf flow?
+      props[key] = validateProp(key, propOptions, propsData, vm);
     }
-  } else {
-    markStaticNode(tree, key, isOnce);
+    toggleObserving(true);
+    // keep a copy of raw propsData
+    vm.$options.propsData = propsData;
   }
-}
 
-function markStaticNode (node, key, isOnce) {
-  node.isStatic = true;
-  node.key = key;
-  node.isOnce = isOnce;
+  // update listeners
+  listeners = listeners || emptyObject;
+  var oldListeners = vm.$options._parentListeners;
+  vm.$options._parentListeners = listeners;
+  updateComponentListeners(vm, listeners, oldListeners);
+
+  // resolve slots + force update if has children
+  if (needsForceUpdate) {
+    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+    vm.$forceUpdate();
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    isUpdatingChildComponent = false;
+  }
 }
 
-/*  */
+function isInInactiveTree (vm) {
+  while (vm && (vm = vm.$parent)) {
+    if (vm._inactive) { return true }
+  }
+  return false
+}
 
-function bindObjectListeners (data, value) {
-  if (value) {
-    if (!isPlainObject(value)) {
-      process.env.NODE_ENV !== 'production' && warn(
-        'v-on without argument expects an Object value',
-        this
-      );
-    } else {
-      var on = data.on = data.on ? extend({}, data.on) : {};
-      for (var key in value) {
-        var existing = on[key];
-        var ours = value[key];
-        on[key] = existing ? [].concat(existing, ours) : ours;
-      }
+function activateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = false;
+    if (isInInactiveTree(vm)) {
+      return
     }
+  } else if (vm._directInactive) {
+    return
+  }
+  if (vm._inactive || vm._inactive === null) {
+    vm._inactive = false;
+    for (var i = 0; i < vm.$children.length; i++) {
+      activateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'activated');
   }
-  return data
 }
 
-/*  */
-
-function bindDynamicKeys (baseObj, values) {
-  for (var i = 0; i < values.length; i += 2) {
-    var key = values[i];
-    if (typeof key === 'string' && key) {
-      baseObj[values[i]] = values[i + 1];
-    } else if (process.env.NODE_ENV !== 'production' && key !== '' && key !== null) {
-      // null is a speical value for explicitly removing a binding
-      warn(
-        ("Invalid value for dynamic directive argument (expected string or null): " + key),
-        this
-      );
+function deactivateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = true;
+    if (isInInactiveTree(vm)) {
+      return
     }
   }
-  return baseObj
+  if (!vm._inactive) {
+    vm._inactive = true;
+    for (var i = 0; i < vm.$children.length; i++) {
+      deactivateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'deactivated');
+  }
 }
 
-// helper to dynamically append modifier runtime markers to event names.
-// ensure only append when value is already string, otherwise it will be cast
-// to string and cause the type check to miss.
-function prependModifier (value, symbol) {
-  return typeof value === 'string' ? symbol + value : value
+function callHook (vm, hook) {
+  // #7573 disable dep collection when invoking lifecycle hooks
+  pushTarget();
+  var handlers = vm.$options[hook];
+  var info = hook + " hook";
+  if (handlers) {
+    for (var i = 0, j = handlers.length; i < j; i++) {
+      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+    }
+  }
+  if (vm._hasHookEvent) {
+    vm.$emit('hook:' + hook);
+  }
+  popTarget();
 }
 
 /*  */
 
-function installRenderHelpers (target) {
-  target._o = markOnce;
-  target._n = toNumber;
-  target._s = toString;
-  target._l = renderList;
-  target._t = renderSlot;
-  target._q = looseEqual;
-  target._i = looseIndexOf;
-  target._m = renderStatic;
-  target._f = resolveFilter;
-  target._k = checkKeyCodes;
-  target._b = bindObjectProps;
-  target._v = createTextVNode;
-  target._e = createEmptyVNode;
-  target._u = resolveScopedSlots;
-  target._g = bindObjectListeners;
-  target._d = bindDynamicKeys;
-  target._p = prependModifier;
-}
+var MAX_UPDATE_COUNT = 100;
 
-/*  */
+var queue = [];
+var activatedChildren = [];
+var has = {};
+var circular = {};
+var waiting = false;
+var flushing = false;
+var index = 0;
 
-function FunctionalRenderContext (
-  data,
-  props,
-  children,
-  parent,
-  Ctor
-) {
-  var options = Ctor.options;
-  // ensure the createElement function in functional components
-  // gets a unique context - this is necessary for correct named slot check
-  var contextVm;
-  if (hasOwn(parent, '_uid')) {
-    contextVm = Object.create(parent);
-    // $flow-disable-line
-    contextVm._original = parent;
-  } else {
-    // the context vm passed in is a functional context as well.
-    // in this case we want to make sure we are able to get a hold to the
-    // real context instance.
-    contextVm = parent;
-    // $flow-disable-line
-    parent = parent._original;
+/**
+ * Reset the scheduler's state.
+ */
+function resetSchedulerState () {
+  index = queue.length = activatedChildren.length = 0;
+  has = {};
+  if (process.env.NODE_ENV !== 'production') {
+    circular = {};
   }
-  var isCompiled = isTrue(options._compiled);
-  var needNormalization = !isCompiled;
+  waiting = flushing = false;
+}
 
-  this.data = data;
-  this.props = props;
-  this.children = children;
-  this.parent = parent;
-  this.listeners = data.on || emptyObject;
-  this.injections = resolveInject(options.inject, parent);
-  this.slots = function () { return resolveSlots(children, parent); };
+// Async edge case #6566 requires saving the timestamp when event listeners are
+// attached. However, calling performance.now() has a perf overhead especially
+// if the page has thousands of event listeners. Instead, we take a timestamp
+// every time the scheduler flushes and use that for all event listeners
+// attached during that flush.
+var currentFlushTimestamp = 0;
 
-  Object.defineProperty(this, 'scopedSlots', ({
-    enumerable: true,
-    get: function get () {
-      return normalizeScopedSlots(data.scopedSlots, this.slots())
-    }
-  }));
+// Async edge case fix requires storing an event listener's attach timestamp.
+var getNow = Date.now;
 
-  // support for compiled functional template
-  if (isCompiled) {
-    // exposing $options for renderStatic()
-    this.$options = options;
-    // pre-resolve slots for renderSlot()
-    this.$slots = this.slots();
-    this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
-  }
+// Determine what event timestamp the browser is using. Annoyingly, the
+// timestamp can either be hi-res (relative to page load) or low-res
+// (relative to UNIX epoch), so in order to compare time we have to use the
+// same timestamp type when saving the flush timestamp.
+if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+  // if the low-res timestamp which is bigger than the event timestamp
+  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+  // and we need to use the hi-res version for event listeners as well.
+  getNow = function () { return performance.now(); };
+}
 
-  if (options._scopeId) {
-    this._c = function (a, b, c, d) {
-      var vnode = createElement(contextVm, a, b, c, d, needNormalization);
-      if (vnode && !Array.isArray(vnode)) {
-        vnode.fnScopeId = options._scopeId;
-        vnode.fnContext = parent;
+/**
+ * Flush both queues and run the watchers.
+ */
+function flushSchedulerQueue () {
+  currentFlushTimestamp = getNow();
+  flushing = true;
+  var watcher, id;
+
+  // Sort queue before flush.
+  // This ensures that:
+  // 1. Components are updated from parent to child. (because parent is always
+  //    created before the child)
+  // 2. A component's user watchers are run before its render watcher (because
+  //    user watchers are created before the render watcher)
+  // 3. If a component is destroyed during a parent component's watcher run,
+  //    its watchers can be skipped.
+  queue.sort(function (a, b) { return a.id - b.id; });
+
+  // do not cache length because more watchers might be pushed
+  // as we run existing watchers
+  for (index = 0; index < queue.length; index++) {
+    watcher = queue[index];
+    if (watcher.before) {
+      watcher.before();
+    }
+    id = watcher.id;
+    has[id] = null;
+    watcher.run();
+    // in dev build, check and stop circular updates.
+    if (process.env.NODE_ENV !== 'production' && has[id] != null) {
+      circular[id] = (circular[id] || 0) + 1;
+      if (circular[id] > MAX_UPDATE_COUNT) {
+        warn(
+          'You may have an infinite update loop ' + (
+            watcher.user
+              ? ("in watcher with expression \"" + (watcher.expression) + "\"")
+              : "in a component render function."
+          ),
+          watcher.vm
+        );
+        break
       }
-      return vnode
-    };
-  } else {
-    this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
+    }
   }
-}
 
-installRenderHelpers(FunctionalRenderContext.prototype);
+  // keep copies of post queues before resetting state
+  var activatedQueue = activatedChildren.slice();
+  var updatedQueue = queue.slice();
 
-function createFunctionalComponent (
-  Ctor,
-  propsData,
-  data,
-  contextVm,
-  children
-) {
-  var options = Ctor.options;
-  var props = {};
-  var propOptions = options.props;
-  if (isDef(propOptions)) {
-    for (var key in propOptions) {
-      props[key] = validateProp(key, propOptions, propsData || emptyObject);
-    }
-  } else {
-    if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
-    if (isDef(data.props)) { mergeProps(props, data.props); }
-  }
+  resetSchedulerState();
 
-  var renderContext = new FunctionalRenderContext(
-    data,
-    props,
-    children,
-    contextVm,
-    Ctor
-  );
+  // call component updated and activated hooks
+  callActivatedHooks(activatedQueue);
+  callUpdatedHooks(updatedQueue);
 
-  var vnode = options.render.call(null, renderContext._c, renderContext);
+  // devtool hook
+  /* istanbul ignore if */
+  if (devtools && config.devtools) {
+    devtools.emit('flush');
+  }
+}
 
-  if (vnode instanceof VNode) {
-    return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
-  } else if (Array.isArray(vnode)) {
-    var vnodes = normalizeChildren(vnode) || [];
-    var res = new Array(vnodes.length);
-    for (var i = 0; i < vnodes.length; i++) {
-      res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
+function callUpdatedHooks (queue) {
+  var i = queue.length;
+  while (i--) {
+    var watcher = queue[i];
+    var vm = watcher.vm;
+    if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+      callHook(vm, 'updated');
     }
-    return res
   }
 }
 
-function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
-  // #7817 clone node before setting fnContext, otherwise if the node is reused
-  // (e.g. it was from a cached normal slot) the fnContext causes named slots
-  // that should not be matched to match.
-  var clone = cloneVNode(vnode);
-  clone.fnContext = contextVm;
-  clone.fnOptions = options;
-  if (process.env.NODE_ENV !== 'production') {
-    (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
-  }
-  if (data.slot) {
-    (clone.data || (clone.data = {})).slot = data.slot;
+/**
+ * Queue a kept-alive component that was activated during patch.
+ * The queue will be processed after the entire tree has been patched.
+ */
+function queueActivatedComponent (vm) {
+  // setting _inactive to false here so that a render function can
+  // rely on checking whether it's in an inactive tree (e.g. router-view)
+  vm._inactive = false;
+  activatedChildren.push(vm);
+}
+
+function callActivatedHooks (queue) {
+  for (var i = 0; i < queue.length; i++) {
+    queue[i]._inactive = true;
+    activateChildComponent(queue[i], true /* true */);
   }
-  return clone
 }
 
-function mergeProps (to, from) {
-  for (var key in from) {
-    to[camelize(key)] = from[key];
+/**
+ * Push a watcher into the watcher queue.
+ * Jobs with duplicate IDs will be skipped unless it's
+ * pushed when the queue is being flushed.
+ */
+function queueWatcher (watcher) {
+  var id = watcher.id;
+  if (has[id] == null) {
+    has[id] = true;
+    if (!flushing) {
+      queue.push(watcher);
+    } else {
+      // if already flushing, splice the watcher based on its id
+      // if already past its id, it will be run next immediately.
+      var i = queue.length - 1;
+      while (i > index && queue[i].id > watcher.id) {
+        i--;
+      }
+      queue.splice(i + 1, 0, watcher);
+    }
+    // queue the flush
+    if (!waiting) {
+      waiting = true;
+
+      if (process.env.NODE_ENV !== 'production' && !config.async) {
+        flushSchedulerQueue();
+        return
+      }
+      nextTick(flushSchedulerQueue);
+    }
   }
 }
 
 /*  */
 
-/*  */
 
-/*  */
 
-/*  */
+var uid$2 = 0;
 
-// inline hooks to be invoked on component VNodes during patch
-var componentVNodeHooks = {
-  init: function init (vnode, hydrating) {
-    if (
-      vnode.componentInstance &&
-      !vnode.componentInstance._isDestroyed &&
-      vnode.data.keepAlive
-    ) {
-      // kept-alive components, treat as a patch
-      var mountedNode = vnode; // work around flow
-      componentVNodeHooks.prepatch(mountedNode, mountedNode);
-    } else {
-      var child = vnode.componentInstance = createComponentInstanceForVnode(
-        vnode,
-        activeInstance
+/**
+ * A watcher parses an expression, collects dependencies,
+ * and fires callback when the expression value changes.
+ * This is used for both the $watch() api and directives.
+ */
+var Watcher = function Watcher (
+  vm,
+  expOrFn,
+  cb,
+  options,
+  isRenderWatcher
+) {
+  this.vm = vm;
+  if (isRenderWatcher) {
+    vm._watcher = this;
+  }
+  vm._watchers.push(this);
+  // options
+  if (options) {
+    this.deep = !!options.deep;
+    this.user = !!options.user;
+    this.lazy = !!options.lazy;
+    this.sync = !!options.sync;
+    this.before = options.before;
+  } else {
+    this.deep = this.user = this.lazy = this.sync = false;
+  }
+  this.cb = cb;
+  this.id = ++uid$2; // uid for batching
+  this.active = true;
+  this.dirty = this.lazy; // for lazy watchers
+  this.deps = [];
+  this.newDeps = [];
+  this.depIds = new _Set();
+  this.newDepIds = new _Set();
+  this.expression = process.env.NODE_ENV !== 'production'
+    ? expOrFn.toString()
+    : '';
+  // parse expression for getter
+  if (typeof expOrFn === 'function') {
+    this.getter = expOrFn;
+  } else {
+    this.getter = parsePath(expOrFn);
+    if (!this.getter) {
+      this.getter = noop;
+      process.env.NODE_ENV !== 'production' && warn(
+        "Failed watching path: \"" + expOrFn + "\" " +
+        'Watcher only accepts simple dot-delimited paths. ' +
+        'For full control, use a function instead.',
+        vm
       );
-      child.$mount(hydrating ? vnode.elm : undefined, hydrating);
     }
-  },
-
-  prepatch: function prepatch (oldVnode, vnode) {
-    var options = vnode.componentOptions;
-    var child = vnode.componentInstance = oldVnode.componentInstance;
-    updateChildComponent(
-      child,
-      options.propsData, // updated props
-      options.listeners, // updated listeners
-      vnode, // new parent vnode
-      options.children // new children
-    );
-  },
+  }
+  this.value = this.lazy
+    ? undefined
+    : this.get();
+};
 
-  insert: function insert (vnode) {
-    var context = vnode.context;
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isMounted) {
-      componentInstance._isMounted = true;
-      callHook(componentInstance, 'mounted');
-    }
-    if (vnode.data.keepAlive) {
-      if (context._isMounted) {
-        // vue-router#1212
-        // During updates, a kept-alive component's child components may
-        // change, so directly walking the tree here may call activated hooks
-        // on incorrect children. Instead we push them into a queue which will
-        // be processed after the whole patch process ended.
-        queueActivatedComponent(componentInstance);
-      } else {
-        activateChildComponent(componentInstance, true /* direct */);
-      }
+/**
+ * Evaluate the getter, and re-collect dependencies.
+ */
+Watcher.prototype.get = function get () {
+  pushTarget(this);
+  var value;
+  var vm = this.vm;
+  try {
+    value = this.getter.call(vm, vm);
+  } catch (e) {
+    if (this.user) {
+      handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+    } else {
+      throw e
     }
-  },
-
-  destroy: function destroy (vnode) {
-    var componentInstance = vnode.componentInstance;
-    if (!componentInstance._isDestroyed) {
-      if (!vnode.data.keepAlive) {
-        componentInstance.$destroy();
-      } else {
-        deactivateChildComponent(componentInstance, true /* direct */);
-      }
+  } finally {
+    // "touch" every property so they are all tracked as
+    // dependencies for deep watching
+    if (this.deep) {
+      traverse(value);
     }
+    popTarget();
+    this.cleanupDeps();
   }
+  return value
 };
 
-var hooksToMerge = Object.keys(componentVNodeHooks);
-
-function createComponent (
-  Ctor,
-  data,
-  context,
-  children,
-  tag
-) {
-  if (isUndef(Ctor)) {
-    return
-  }
-
-  var baseCtor = context.$options._base;
-
-  // plain options object: turn it into a constructor
-  if (isObject(Ctor)) {
-    Ctor = baseCtor.extend(Ctor);
-  }
-
-  // if at this stage it's not a constructor or an async component factory,
-  // reject.
-  if (typeof Ctor !== 'function') {
-    if (process.env.NODE_ENV !== 'production') {
-      warn(("Invalid Component definition: " + (String(Ctor))), context);
+/**
+ * Add a dependency to this directive.
+ */
+Watcher.prototype.addDep = function addDep (dep) {
+  var id = dep.id;
+  if (!this.newDepIds.has(id)) {
+    this.newDepIds.add(id);
+    this.newDeps.push(dep);
+    if (!this.depIds.has(id)) {
+      dep.addSub(this);
     }
-    return
   }
+};
 
-  // async component
-  var asyncFactory;
-  if (isUndef(Ctor.cid)) {
-    asyncFactory = Ctor;
-    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
-    if (Ctor === undefined) {
-      // return a placeholder node for async component, which is rendered
-      // as a comment node but preserves all the raw information for the node.
-      // the information will be used for async server-rendering and hydration.
-      return createAsyncPlaceholder(
-        asyncFactory,
-        data,
-        context,
-        children,
-        tag
-      )
+/**
+ * Clean up for dependency collection.
+ */
+Watcher.prototype.cleanupDeps = function cleanupDeps () {
+  var i = this.deps.length;
+  while (i--) {
+    var dep = this.deps[i];
+    if (!this.newDepIds.has(dep.id)) {
+      dep.removeSub(this);
     }
   }
+  var tmp = this.depIds;
+  this.depIds = this.newDepIds;
+  this.newDepIds = tmp;
+  this.newDepIds.clear();
+  tmp = this.deps;
+  this.deps = this.newDeps;
+  this.newDeps = tmp;
+  this.newDeps.length = 0;
+};
 
-  data = data || {};
-
-  // resolve constructor options in case global mixins are applied after
-  // component constructor creation
-  resolveConstructorOptions(Ctor);
-
-  // transform component v-model data into props & events
-  if (isDef(data.model)) {
-    transformModel(Ctor.options, data);
-  }
-
-  // extract props
-  var propsData = extractPropsFromVNodeData(data, Ctor, tag);
-
-  // functional component
-  if (isTrue(Ctor.options.functional)) {
-    return createFunctionalComponent(Ctor, propsData, data, context, children)
+/**
+ * Subscriber interface.
+ * Will be called when a dependency changes.
+ */
+Watcher.prototype.update = function update () {
+  /* istanbul ignore else */
+  if (this.lazy) {
+    this.dirty = true;
+  } else if (this.sync) {
+    this.run();
+  } else {
+    queueWatcher(this);
   }
+};
 
-  // extract listeners, since these needs to be treated as
-  // child component listeners instead of DOM listeners
-  var listeners = data.on;
-  // replace with listeners with .native modifier
-  // so it gets processed during parent component patch.
-  data.on = data.nativeOn;
-
-  if (isTrue(Ctor.options.abstract)) {
-    // abstract components do not keep anything
-    // other than props & listeners & slot
-
-    // work around flow
-    var slot = data.slot;
-    data = {};
-    if (slot) {
-      data.slot = slot;
+/**
+ * Scheduler job interface.
+ * Will be called by the scheduler.
+ */
+Watcher.prototype.run = function run () {
+  if (this.active) {
+    var value = this.get();
+    if (
+      value !== this.value ||
+      // Deep watchers and watchers on Object/Arrays should fire even
+      // when the value is the same, because the value may
+      // have mutated.
+      isObject(value) ||
+      this.deep
+    ) {
+      // set new value
+      var oldValue = this.value;
+      this.value = value;
+      if (this.user) {
+        try {
+          this.cb.call(this.vm, value, oldValue);
+        } catch (e) {
+          handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
+        }
+      } else {
+        this.cb.call(this.vm, value, oldValue);
+      }
     }
   }
+};
 
-  // install component management hooks onto the placeholder node
-  installComponentHooks(data);
-
-  // return a placeholder vnode
-  var name = Ctor.options.name || tag;
-  var vnode = new VNode(
-    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
-    data, undefined, undefined, undefined, context,
-    { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
-    asyncFactory
-  );
-
-  return vnode
-}
-
-function createComponentInstanceForVnode (
-  vnode, // we know it's MountedComponentVNode but flow doesn't
-  parent // activeInstance in lifecycle state
-) {
-  var options = {
-    _isComponent: true,
-    _parentVnode: vnode,
-    parent: parent
-  };
-  // check inline-template render functions
-  var inlineTemplate = vnode.data.inlineTemplate;
-  if (isDef(inlineTemplate)) {
-    options.render = inlineTemplate.render;
-    options.staticRenderFns = inlineTemplate.staticRenderFns;
-  }
-  return new vnode.componentOptions.Ctor(options)
-}
+/**
+ * Evaluate the value of the watcher.
+ * This only gets called for lazy watchers.
+ */
+Watcher.prototype.evaluate = function evaluate () {
+  this.value = this.get();
+  this.dirty = false;
+};
 
-function installComponentHooks (data) {
-  var hooks = data.hook || (data.hook = {});
-  for (var i = 0; i < hooksToMerge.length; i++) {
-    var key = hooksToMerge[i];
-    var existing = hooks[key];
-    var toMerge = componentVNodeHooks[key];
-    if (existing !== toMerge && !(existing && existing._merged)) {
-      hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
-    }
+/**
+ * Depend on all deps collected by this watcher.
+ */
+Watcher.prototype.depend = function depend () {
+  var i = this.deps.length;
+  while (i--) {
+    this.deps[i].depend();
   }
-}
-
-function mergeHook$1 (f1, f2) {
-  var merged = function (a, b) {
-    // flow complains about extra args which is why we use any
-    f1(a, b);
-    f2(a, b);
-  };
-  merged._merged = true;
-  return merged
-}
+};
 
-// transform component v-model info (value and callback) into
-// prop and event handler respectively.
-function transformModel (options, data) {
-  var prop = (options.model && options.model.prop) || 'value';
-  var event = (options.model && options.model.event) || 'input'
-  ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
-  var on = data.on || (data.on = {});
-  var existing = on[event];
-  var callback = data.model.callback;
-  if (isDef(existing)) {
-    if (
-      Array.isArray(existing)
-        ? existing.indexOf(callback) === -1
-        : existing !== callback
-    ) {
-      on[event] = [callback].concat(existing);
+/**
+ * Remove self from all dependencies' subscriber list.
+ */
+Watcher.prototype.teardown = function teardown () {
+  if (this.active) {
+    // remove self from vm's watcher list
+    // this is a somewhat expensive operation so we skip it
+    // if the vm is being destroyed.
+    if (!this.vm._isBeingDestroyed) {
+      remove(this.vm._watchers, this);
     }
-  } else {
-    on[event] = callback;
+    var i = this.deps.length;
+    while (i--) {
+      this.deps[i].removeSub(this);
+    }
+    this.active = false;
   }
-}
+};
 
 /*  */
 
-var SIMPLE_NORMALIZE = 1;
-var ALWAYS_NORMALIZE = 2;
+var sharedPropertyDefinition = {
+  enumerable: true,
+  configurable: true,
+  get: noop,
+  set: noop
+};
 
-// wrapper function for providing a more flexible interface
-// without getting yelled at by flow
-function createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType,
-  alwaysNormalize
-) {
-  if (Array.isArray(data) || isPrimitive(data)) {
-    normalizationType = children;
-    children = data;
-    data = undefined;
+function proxy (target, sourceKey, key) {
+  sharedPropertyDefinition.get = function proxyGetter () {
+    return this[sourceKey][key]
+  };
+  sharedPropertyDefinition.set = function proxySetter (val) {
+    this[sourceKey][key] = val;
+  };
+  Object.defineProperty(target, key, sharedPropertyDefinition);
+}
+
+function initState (vm) {
+  vm._watchers = [];
+  var opts = vm.$options;
+  if (opts.props) { initProps(vm, opts.props); }
+  if (opts.methods) { initMethods(vm, opts.methods); }
+  if (opts.data) {
+    initData(vm);
+  } else {
+    observe(vm._data = {}, true /* asRootData */);
   }
-  if (isTrue(alwaysNormalize)) {
-    normalizationType = ALWAYS_NORMALIZE;
+  if (opts.computed) { initComputed(vm, opts.computed); }
+  if (opts.watch && opts.watch !== nativeWatch) {
+    initWatch(vm, opts.watch);
   }
-  return _createElement(context, tag, data, children, normalizationType)
 }
 
-function _createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType
-) {
-  if (isDef(data) && isDef((data).__ob__)) {
+function initProps (vm, propsOptions) {
+  var propsData = vm.$options.propsData || {};
+  var props = vm._props = {};
+  // cache prop keys so that future props updates can iterate using Array
+  // instead of dynamic object key enumeration.
+  var keys = vm.$options._propKeys = [];
+  var isRoot = !vm.$parent;
+  // root instance props should be converted
+  if (!isRoot) {
+    toggleObserving(false);
+  }
+  var loop = function ( key ) {
+    keys.push(key);
+    var value = validateProp(key, propsOptions, propsData, vm);
+    /* istanbul ignore else */
+    if (process.env.NODE_ENV !== 'production') {
+      var hyphenatedKey = hyphenate(key);
+      if (isReservedAttribute(hyphenatedKey) ||
+          config.isReservedAttr(hyphenatedKey)) {
+        warn(
+          ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
+          vm
+        );
+      }
+      defineReactive$$1(props, key, value, function () {
+        if (!isRoot && !isUpdatingChildComponent) {
+          warn(
+            "Avoid mutating a prop directly since the value will be " +
+            "overwritten whenever the parent component re-renders. " +
+            "Instead, use a data or computed property based on the prop's " +
+            "value. Prop being mutated: \"" + key + "\"",
+            vm
+          );
+        }
+      });
+    } else {
+      defineReactive$$1(props, key, value);
+    }
+    // static props are already proxied on the component's prototype
+    // during Vue.extend(). We only need to proxy props defined at
+    // instantiation here.
+    if (!(key in vm)) {
+      proxy(vm, "_props", key);
+    }
+  };
+
+  for (var key in propsOptions) loop( key );
+  toggleObserving(true);
+}
+
+function initData (vm) {
+  var data = vm.$options.data;
+  data = vm._data = typeof data === 'function'
+    ? getData(data, vm)
+    : data || {};
+  if (!isPlainObject(data)) {
+    data = {};
     process.env.NODE_ENV !== 'production' && warn(
-      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-      'Always create fresh vnode data objects in each render!',
-      context
+      'data functions should return an object:\n' +
+      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+      vm
     );
-    return createEmptyVNode()
-  }
-  // object syntax in v-bind
-  if (isDef(data) && isDef(data.is)) {
-    tag = data.is;
   }
-  if (!tag) {
-    // in case of component :is set to falsy value
-    return createEmptyVNode()
-  }
-  // warn against non-primitive key
-  if (process.env.NODE_ENV !== 'production' &&
-    isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-  ) {
-    {
-      warn(
-        'Avoid using non-primitive value as key, ' +
-        'use string/number value instead.',
-        context
+  // proxy data on instance
+  var keys = Object.keys(data);
+  var props = vm.$options.props;
+  var methods = vm.$options.methods;
+  var i = keys.length;
+  while (i--) {
+    var key = keys[i];
+    if (process.env.NODE_ENV !== 'production') {
+      if (methods && hasOwn(methods, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a data property."),
+          vm
+        );
+      }
+    }
+    if (props && hasOwn(props, key)) {
+      process.env.NODE_ENV !== 'production' && warn(
+        "The data property \"" + key + "\" is already declared as a prop. " +
+        "Use prop default value instead.",
+        vm
       );
+    } else if (!isReserved(key)) {
+      proxy(vm, "_data", key);
     }
   }
-  // support single function children as default scoped slot
-  if (Array.isArray(children) &&
-    typeof children[0] === 'function'
-  ) {
-    data = data || {};
-    data.scopedSlots = { default: children[0] };
-    children.length = 0;
-  }
-  if (normalizationType === ALWAYS_NORMALIZE) {
-    children = normalizeChildren(children);
-  } else if (normalizationType === SIMPLE_NORMALIZE) {
-    children = simpleNormalizeChildren(children);
+  // observe data
+  observe(data, true /* asRootData */);
+}
+
+function getData (data, vm) {
+  // #7573 disable dep collection when invoking data getters
+  pushTarget();
+  try {
+    return data.call(vm, vm)
+  } catch (e) {
+    handleError(e, vm, "data()");
+    return {}
+  } finally {
+    popTarget();
   }
-  var vnode, ns;
-  if (typeof tag === 'string') {
-    var Ctor;
-    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-    if (config.isReservedTag(tag)) {
-      // platform built-in elements
-      vnode = new VNode(
-        config.parsePlatformTagName(tag), data, children,
-        undefined, undefined, context
+}
+
+var computedWatcherOptions = { lazy: true };
+
+function initComputed (vm, computed) {
+  // $flow-disable-line
+  var watchers = vm._computedWatchers = Object.create(null);
+  // computed properties are just getters during SSR
+  var isSSR = isServerRendering();
+
+  for (var key in computed) {
+    var userDef = computed[key];
+    var getter = typeof userDef === 'function' ? userDef : userDef.get;
+    if (process.env.NODE_ENV !== 'production' && getter == null) {
+      warn(
+        ("Getter is missing for computed property \"" + key + "\"."),
+        vm
       );
-    } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-      // component
-      vnode = createComponent(Ctor, data, context, children, tag);
-    } else {
-      // unknown or unlisted namespaced elements
-      // check at runtime because it may get assigned a namespace when its
-      // parent normalizes children
-      vnode = new VNode(
-        tag, data, children,
-        undefined, undefined, context
+    }
+
+    if (!isSSR) {
+      // create internal watcher for the computed property.
+      watchers[key] = new Watcher(
+        vm,
+        getter || noop,
+        noop,
+        computedWatcherOptions
       );
     }
-  } else {
-    // direct component options / constructor
-    vnode = createComponent(tag, data, context, children);
+
+    // component-defined computed properties are already defined on the
+    // component prototype. We only need to define computed properties defined
+    // at instantiation here.
+    if (!(key in vm)) {
+      defineComputed(vm, key, userDef);
+    } else if (process.env.NODE_ENV !== 'production') {
+      if (key in vm.$data) {
+        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
+      } else if (vm.$options.props && key in vm.$options.props) {
+        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+      }
+    }
   }
-  if (Array.isArray(vnode)) {
-    return vnode
-  } else if (isDef(vnode)) {
-    if (isDef(ns)) { applyNS(vnode, ns); }
-    if (isDef(data)) { registerDeepBindings(data); }
-    return vnode
+}
+
+function defineComputed (
+  target,
+  key,
+  userDef
+) {
+  var shouldCache = !isServerRendering();
+  if (typeof userDef === 'function') {
+    sharedPropertyDefinition.get = shouldCache
+      ? createComputedGetter(key)
+      : createGetterInvoker(userDef);
+    sharedPropertyDefinition.set = noop;
   } else {
-    return createEmptyVNode()
+    sharedPropertyDefinition.get = userDef.get
+      ? shouldCache && userDef.cache !== false
+        ? createComputedGetter(key)
+        : createGetterInvoker(userDef.get)
+      : noop;
+    sharedPropertyDefinition.set = userDef.set || noop;
+  }
+  if (process.env.NODE_ENV !== 'production' &&
+      sharedPropertyDefinition.set === noop) {
+    sharedPropertyDefinition.set = function () {
+      warn(
+        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
+        this
+      );
+    };
   }
+  Object.defineProperty(target, key, sharedPropertyDefinition);
 }
 
-function applyNS (vnode, ns, force) {
-  vnode.ns = ns;
-  if (vnode.tag === 'foreignObject') {
-    // use default namespace inside foreignObject
-    ns = undefined;
-    force = true;
-  }
-  if (isDef(vnode.children)) {
-    for (var i = 0, l = vnode.children.length; i < l; i++) {
-      var child = vnode.children[i];
-      if (isDef(child.tag) && (
-        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-        applyNS(child, ns, force);
+function createComputedGetter (key) {
+  return function computedGetter () {
+    var watcher = this._computedWatchers && this._computedWatchers[key];
+    if (watcher) {
+      if (watcher.dirty) {
+        watcher.evaluate();
+      }
+      if (Dep.target) {
+        watcher.depend();
       }
+      return watcher.value
     }
   }
 }
 
-// ref #5318
-// necessary to ensure parent re-render when deep bindings like :style and
-// :class are used on slot nodes
-function registerDeepBindings (data) {
-  if (isObject(data.style)) {
-    traverse(data.style);
-  }
-  if (isObject(data.class)) {
-    traverse(data.class);
+function createGetterInvoker(fn) {
+  return function computedGetter () {
+    return fn.call(this, this)
   }
 }
 
-/*  */
-
-function initRender (vm) {
-  vm._vnode = null; // the root of the child tree
-  vm._staticTrees = null; // v-once cached trees
-  var options = vm.$options;
-  var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
-  var renderContext = parentVnode && parentVnode.context;
-  vm.$slots = resolveSlots(options._renderChildren, renderContext);
-  vm.$scopedSlots = emptyObject;
-  // bind the createElement fn to this instance
-  // so that we get proper render context inside it.
-  // args order: tag, data, children, normalizationType, alwaysNormalize
-  // internal version is used by render functions compiled from templates
-  vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
-  // normalization is always applied for the public version, used in
-  // user-written render functions.
-  vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+function initMethods (vm, methods) {
+  var props = vm.$options.props;
+  for (var key in methods) {
+    if (process.env.NODE_ENV !== 'production') {
+      if (typeof methods[key] !== 'function') {
+        warn(
+          "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
+          "Did you reference the function correctly?",
+          vm
+        );
+      }
+      if (props && hasOwn(props, key)) {
+        warn(
+          ("Method \"" + key + "\" has already been defined as a prop."),
+          vm
+        );
+      }
+      if ((key in vm) && isReserved(key)) {
+        warn(
+          "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
+          "Avoid defining component methods that start with _ or $."
+        );
+      }
+    }
+    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+  }
+}
 
-  // $attrs & $listeners are exposed for easier HOC creation.
-  // they need to be reactive so that HOCs using them are always updated
-  var parentData = parentVnode && parentVnode.data;
+function initWatch (vm, watch) {
+  for (var key in watch) {
+    var handler = watch[key];
+    if (Array.isArray(handler)) {
+      for (var i = 0; i < handler.length; i++) {
+        createWatcher(vm, key, handler[i]);
+      }
+    } else {
+      createWatcher(vm, key, handler);
+    }
+  }
+}
 
-  /* istanbul ignore else */
-  if (process.env.NODE_ENV !== 'production') {
-    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
-    }, true);
-    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
-      !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
-    }, true);
-  } else {
-    defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, null, true);
-    defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, null, true);
+function createWatcher (
+  vm,
+  expOrFn,
+  handler,
+  options
+) {
+  if (isPlainObject(handler)) {
+    options = handler;
+    handler = handler.handler;
+  }
+  if (typeof handler === 'string') {
+    handler = vm[handler];
   }
+  return vm.$watch(expOrFn, handler, options)
 }
 
-function renderMixin (Vue) {
-  // install runtime convenience helpers
-  installRenderHelpers(Vue.prototype);
+function stateMixin (Vue) {
+  // flow somehow has problems with directly declared definition object
+  // when using Object.defineProperty, so we have to procedurally build up
+  // the object here.
+  var dataDef = {};
+  dataDef.get = function () { return this._data };
+  var propsDef = {};
+  propsDef.get = function () { return this._props };
+  if (process.env.NODE_ENV !== 'production') {
+    dataDef.set = function () {
+      warn(
+        'Avoid replacing instance root $data. ' +
+        'Use nested data properties instead.',
+        this
+      );
+    };
+    propsDef.set = function () {
+      warn("$props is readonly.", this);
+    };
+  }
+  Object.defineProperty(Vue.prototype, '$data', dataDef);
+  Object.defineProperty(Vue.prototype, '$props', propsDef);
 
-  Vue.prototype.$nextTick = function (fn) {
-    return nextTick(fn, this)
-  };
+  Vue.prototype.$set = set;
+  Vue.prototype.$delete = del;
 
-  Vue.prototype._render = function () {
+  Vue.prototype.$watch = function (
+    expOrFn,
+    cb,
+    options
+  ) {
     var vm = this;
-    var ref = vm.$options;
-    var render = ref.render;
-    var _parentVnode = ref._parentVnode;
-
-    if (_parentVnode) {
-      vm.$scopedSlots = normalizeScopedSlots(
-        _parentVnode.data.scopedSlots,
-        vm.$slots
-      );
+    if (isPlainObject(cb)) {
+      return createWatcher(vm, expOrFn, cb, options)
     }
-
-    // set parent vnode. this allows render functions to have access
-    // to the data on the placeholder node.
-    vm.$vnode = _parentVnode;
-    // render self
-    var vnode;
-    try {
-      vnode = render.call(vm._renderProxy, vm.$createElement);
-    } catch (e) {
-      handleError(e, vm, "render");
-      // return error render result,
-      // or previous vnode to prevent render error causing blank component
-      /* istanbul ignore else */
-      if (process.env.NODE_ENV !== 'production' && vm.$options.renderError) {
-        try {
-          vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
-        } catch (e) {
-          handleError(e, vm, "renderError");
-          vnode = vm._vnode;
-        }
-      } else {
-        vnode = vm._vnode;
+    options = options || {};
+    options.user = true;
+    var watcher = new Watcher(vm, expOrFn, cb, options);
+    if (options.immediate) {
+      try {
+        cb.call(vm, watcher.value);
+      } catch (error) {
+        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
       }
     }
-    // if the returned array contains only a single node, allow it
-    if (Array.isArray(vnode) && vnode.length === 1) {
-      vnode = vnode[0];
-    }
-    // return empty vnode in case the render function errored out
-    if (!(vnode instanceof VNode)) {
-      if (process.env.NODE_ENV !== 'production' && Array.isArray(vnode)) {
-        warn(
-          'Multiple root nodes returned from render function. Render function ' +
-          'should return a single root node.',
-          vm
-        );
-      }
-      vnode = createEmptyVNode();
+    return function unwatchFn () {
+      watcher.teardown();
     }
-    // set parent
-    vnode.parent = _parentVnode;
-    return vnode
   };
 }
 
@@ -5339,7 +5342,7 @@ Object.defineProperty(Vue, 'FunctionalRenderContext', {
   value: FunctionalRenderContext
 });
 
-Vue.version = '2.6.2';
+Vue.version = '2.6.3';
 
 /*  */
 
@@ -6766,6 +6769,11 @@ function createOnceHandler$1 (event, handler, capture) {
   }
 }
 
+// #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+// implementation and does not fire microtasks in between event propagation, so
+// safe to exclude.
+var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
 function add$1 (
   name,
   handler,
@@ -6778,11 +6786,16 @@ function add$1 (
   // the solution is simple: we save the timestamp when a handler is attached,
   // and the handler would only fire if the event passed to it was fired
   // AFTER it was attached.
-  if (isUsingMicroTask) {
+  if (useMicrotaskFix) {
     var attachedTimestamp = currentFlushTimestamp;
     var original = handler;
     handler = original._wrapper = function (e) {
-      if (e.timeStamp >= attachedTimestamp) {
+      if (
+        e.timeStamp >= attachedTimestamp ||
+        // #9448 bail if event is fired in another document in a multi-page
+        // electron/nw.js app
+        e.target.ownerDocument !== document
+      ) {
         return original.apply(this, arguments)
       }
     };
diff --git a/dist/vue.runtime.js b/dist/vue.runtime.js
index 89a65bdf4fd..32ac81afdbb 100644
--- a/dist/vue.runtime.js
+++ b/dist/vue.runtime.js
@@ -1,5 +1,5 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
@@ -529,6 +529,7 @@
   var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
   var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
   var isPhantomJS = UA && /phantomjs/.test(UA);
+  var isFF = UA && UA.match(/firefox\/(\d+)/);
 
   // Firefox has a "watch" function on Object.prototype...
   var nativeWatch = ({}).watch;
@@ -2399,2437 +2400,2439 @@
 
   /*  */
 
-  function ensureCtor (comp, base) {
-    if (
-      comp.__esModule ||
-      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-    ) {
-      comp = comp.default;
+  function initProvide (vm) {
+    var provide = vm.$options.provide;
+    if (provide) {
+      vm._provided = typeof provide === 'function'
+        ? provide.call(vm)
+        : provide;
     }
-    return isObject(comp)
-      ? base.extend(comp)
-      : comp
-  }
-
-  function createAsyncPlaceholder (
-    factory,
-    data,
-    context,
-    children,
-    tag
-  ) {
-    var node = createEmptyVNode();
-    node.asyncFactory = factory;
-    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-    return node
   }
 
-  function resolveAsyncComponent (
-    factory,
-    baseCtor,
-    context
-  ) {
-    if (isTrue(factory.error) && isDef(factory.errorComp)) {
-      return factory.errorComp
-    }
-
-    if (isDef(factory.resolved)) {
-      return factory.resolved
-    }
-
-    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-      return factory.loadingComp
-    }
-
-    if (isDef(factory.contexts)) {
-      // already pending
-      factory.contexts.push(context);
-    } else {
-      var contexts = factory.contexts = [context];
-      var sync = true;
-
-      var forceRender = function (renderCompleted) {
-        for (var i = 0, l = contexts.length; i < l; i++) {
-          contexts[i].$forceUpdate();
-        }
-
-        if (renderCompleted) {
-          contexts.length = 0;
-        }
-      };
-
-      var resolve = once(function (res) {
-        // cache resolved
-        factory.resolved = ensureCtor(res, baseCtor);
-        // invoke callbacks only if this is not a synchronous resolve
-        // (async resolves are shimmed as synchronous during SSR)
-        if (!sync) {
-          forceRender(true);
-        } else {
-          contexts.length = 0;
-        }
-      });
-
-      var reject = once(function (reason) {
-        warn(
-          "Failed to resolve async component: " + (String(factory)) +
-          (reason ? ("\nReason: " + reason) : '')
-        );
-        if (isDef(factory.errorComp)) {
-          factory.error = true;
-          forceRender(true);
+  function initInjections (vm) {
+    var result = resolveInject(vm.$options.inject, vm);
+    if (result) {
+      toggleObserving(false);
+      Object.keys(result).forEach(function (key) {
+        /* istanbul ignore else */
+        {
+          defineReactive$$1(vm, key, result[key], function () {
+            warn(
+              "Avoid mutating an injected value directly since the changes will be " +
+              "overwritten whenever the provided component re-renders. " +
+              "injection being mutated: \"" + key + "\"",
+              vm
+            );
+          });
         }
       });
+      toggleObserving(true);
+    }
+  }
 
-      var res = factory(resolve, reject);
-
-      if (isObject(res)) {
-        if (isPromise(res)) {
-          // () => Promise
-          if (isUndef(factory.resolved)) {
-            res.then(resolve, reject);
-          }
-        } else if (isPromise(res.component)) {
-          res.component.then(resolve, reject);
-
-          if (isDef(res.error)) {
-            factory.errorComp = ensureCtor(res.error, baseCtor);
-          }
+  function resolveInject (inject, vm) {
+    if (inject) {
+      // inject is :any because flow is not smart enough to figure out cached
+      var result = Object.create(null);
+      var keys = hasSymbol
+        ? Reflect.ownKeys(inject)
+        : Object.keys(inject);
 
-          if (isDef(res.loading)) {
-            factory.loadingComp = ensureCtor(res.loading, baseCtor);
-            if (res.delay === 0) {
-              factory.loading = true;
-            } else {
-              setTimeout(function () {
-                if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                  factory.loading = true;
-                  forceRender(false);
-                }
-              }, res.delay || 200);
-            }
+      for (var i = 0; i < keys.length; i++) {
+        var key = keys[i];
+        // #6574 in case the inject object is observed...
+        if (key === '__ob__') { continue }
+        var provideKey = inject[key].from;
+        var source = vm;
+        while (source) {
+          if (source._provided && hasOwn(source._provided, provideKey)) {
+            result[key] = source._provided[provideKey];
+            break
           }
-
-          if (isDef(res.timeout)) {
-            setTimeout(function () {
-              if (isUndef(factory.resolved)) {
-                reject(
-                  "timeout (" + (res.timeout) + "ms)"
-                );
-              }
-            }, res.timeout);
+          source = source.$parent;
+        }
+        if (!source) {
+          if ('default' in inject[key]) {
+            var provideDefault = inject[key].default;
+            result[key] = typeof provideDefault === 'function'
+              ? provideDefault.call(vm)
+              : provideDefault;
+          } else {
+            warn(("Injection \"" + key + "\" not found"), vm);
           }
         }
       }
-
-      sync = false;
-      // return in case resolved synchronously
-      return factory.loading
-        ? factory.loadingComp
-        : factory.resolved
+      return result
     }
   }
 
   /*  */
 
-  function isAsyncPlaceholder (node) {
-    return node.isComment && node.asyncFactory
-  }
 
-  /*  */
 
-  function getFirstComponentChild (children) {
-    if (Array.isArray(children)) {
-      for (var i = 0; i < children.length; i++) {
-        var c = children[i];
-        if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
-          return c
+  /**
+   * Runtime helper for resolving raw children VNodes into a slot object.
+   */
+  function resolveSlots (
+    children,
+    context
+  ) {
+    if (!children || !children.length) {
+      return {}
+    }
+    var slots = {};
+    for (var i = 0, l = children.length; i < l; i++) {
+      var child = children[i];
+      var data = child.data;
+      // remove slot attribute if the node is resolved as a Vue slot node
+      if (data && data.attrs && data.attrs.slot) {
+        delete data.attrs.slot;
+      }
+      // named slots should only be respected if the vnode was rendered in the
+      // same context.
+      if ((child.context === context || child.fnContext === context) &&
+        data && data.slot != null
+      ) {
+        var name = data.slot;
+        var slot = (slots[name] || (slots[name] = []));
+        if (child.tag === 'template') {
+          slot.push.apply(slot, child.children || []);
+        } else {
+          slot.push(child);
         }
+      } else {
+        (slots.default || (slots.default = [])).push(child);
+      }
+    }
+    // ignore slots that contains only whitespace
+    for (var name$1 in slots) {
+      if (slots[name$1].every(isWhitespace)) {
+        delete slots[name$1];
       }
     }
+    return slots
   }
 
-  /*  */
+  function isWhitespace (node) {
+    return (node.isComment && !node.asyncFactory) || node.text === ' '
+  }
 
   /*  */
 
-  function initEvents (vm) {
-    vm._events = Object.create(null);
-    vm._hasHookEvent = false;
-    // init parent attached events
-    var listeners = vm.$options._parentListeners;
-    if (listeners) {
-      updateComponentListeners(vm, listeners);
+  function normalizeScopedSlots (
+    slots,
+    normalSlots
+  ) {
+    var res;
+    if (!slots) {
+      res = {};
+    } else if (slots._normalized) {
+      return slots
+    } else {
+      res = {};
+      for (var key in slots) {
+        if (slots[key] && key[0] !== '$') {
+          res[key] = normalizeScopedSlot(slots[key]);
+        }
+      }
+    }
+    // expose normal slots on scopedSlots
+    for (var key$1 in normalSlots) {
+      if (!(key$1 in res)) {
+        res[key$1] = proxyNormalSlot(normalSlots, key$1);
+      }
     }
+    def(res, '_normalized', true);
+    def(res, '$stable', slots ? !!slots.$stable : true);
+    return res
   }
 
-  var target;
-
-  function add (event, fn) {
-    target.$on(event, fn);
+  function normalizeScopedSlot(fn) {
+    return function (scope) {
+      var res = fn(scope);
+      return res && typeof res === 'object' && !Array.isArray(res)
+        ? [res] // single vnode
+        : normalizeChildren(res)
+    }
   }
 
-  function remove$1 (event, fn) {
-    target.$off(event, fn);
+  function proxyNormalSlot(slots, key) {
+    return function () { return slots[key]; }
   }
 
-  function createOnceHandler (event, fn) {
-    var _target = target;
-    return function onceHandler () {
-      var res = fn.apply(null, arguments);
-      if (res !== null) {
-        _target.$off(event, onceHandler);
-      }
-    }
-  }
+  /*  */
 
-  function updateComponentListeners (
-    vm,
-    listeners,
-    oldListeners
+  /**
+   * Runtime helper for rendering v-for lists.
+   */
+  function renderList (
+    val,
+    render
   ) {
-    target = vm;
-    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-    target = undefined;
-  }
-
-  function eventsMixin (Vue) {
-    var hookRE = /^hook:/;
-    Vue.prototype.$on = function (event, fn) {
-      var vm = this;
-      if (Array.isArray(event)) {
-        for (var i = 0, l = event.length; i < l; i++) {
-          vm.$on(event[i], fn);
-        }
-      } else {
-        (vm._events[event] || (vm._events[event] = [])).push(fn);
-        // optimize hook:event cost by using a boolean flag marked at registration
-        // instead of a hash lookup
-        if (hookRE.test(event)) {
-          vm._hasHookEvent = true;
-        }
-      }
-      return vm
-    };
-
-    Vue.prototype.$once = function (event, fn) {
-      var vm = this;
-      function on () {
-        vm.$off(event, on);
-        fn.apply(vm, arguments);
-      }
-      on.fn = fn;
-      vm.$on(event, on);
-      return vm
-    };
-
-    Vue.prototype.$off = function (event, fn) {
-      var vm = this;
-      // all
-      if (!arguments.length) {
-        vm._events = Object.create(null);
-        return vm
-      }
-      // array of events
-      if (Array.isArray(event)) {
-        for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
-          vm.$off(event[i$1], fn);
-        }
-        return vm
-      }
-      // specific event
-      var cbs = vm._events[event];
-      if (!cbs) {
-        return vm
-      }
-      if (!fn) {
-        vm._events[event] = null;
-        return vm
+    var ret, i, l, keys, key;
+    if (Array.isArray(val) || typeof val === 'string') {
+      ret = new Array(val.length);
+      for (i = 0, l = val.length; i < l; i++) {
+        ret[i] = render(val[i], i);
       }
-      // specific handler
-      var cb;
-      var i = cbs.length;
-      while (i--) {
-        cb = cbs[i];
-        if (cb === fn || cb.fn === fn) {
-          cbs.splice(i, 1);
-          break
-        }
+    } else if (typeof val === 'number') {
+      ret = new Array(val);
+      for (i = 0; i < val; i++) {
+        ret[i] = render(i + 1, i);
       }
-      return vm
-    };
-
-    Vue.prototype.$emit = function (event) {
-      var vm = this;
-      {
-        var lowerCaseEvent = event.toLowerCase();
-        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
-          tip(
-            "Event \"" + lowerCaseEvent + "\" is emitted in component " +
-            (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
-            "Note that HTML attributes are case-insensitive and you cannot use " +
-            "v-on to listen to camelCase events when using in-DOM templates. " +
-            "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
-          );
+    } else if (isObject(val)) {
+      if (hasSymbol && val[Symbol.iterator]) {
+        ret = [];
+        var iterator = val[Symbol.iterator]();
+        var result = iterator.next();
+        while (!result.done) {
+          ret.push(render(result.value, ret.length));
+          result = iterator.next();
         }
-      }
-      var cbs = vm._events[event];
-      if (cbs) {
-        cbs = cbs.length > 1 ? toArray(cbs) : cbs;
-        var args = toArray(arguments, 1);
-        var info = "event handler for \"" + event + "\"";
-        for (var i = 0, l = cbs.length; i < l; i++) {
-          invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+      } else {
+        keys = Object.keys(val);
+        ret = new Array(keys.length);
+        for (i = 0, l = keys.length; i < l; i++) {
+          key = keys[i];
+          ret[i] = render(val[key], key, i);
         }
       }
-      return vm
-    };
+    }
+    if (!isDef(ret)) {
+      ret = [];
+    }
+    (ret)._isVList = true;
+    return ret
   }
 
   /*  */
 
-
-
   /**
-   * Runtime helper for resolving raw children VNodes into a slot object.
+   * Runtime helper for rendering <slot>
    */
-  function resolveSlots (
-    children,
-    context
+  function renderSlot (
+    name,
+    fallback,
+    props,
+    bindObject
   ) {
-    if (!children || !children.length) {
-      return {}
-    }
-    var slots = {};
-    for (var i = 0, l = children.length; i < l; i++) {
-      var child = children[i];
-      var data = child.data;
-      // remove slot attribute if the node is resolved as a Vue slot node
-      if (data && data.attrs && data.attrs.slot) {
-        delete data.attrs.slot;
-      }
-      // named slots should only be respected if the vnode was rendered in the
-      // same context.
-      if ((child.context === context || child.fnContext === context) &&
-        data && data.slot != null
-      ) {
-        var name = data.slot;
-        var slot = (slots[name] || (slots[name] = []));
-        if (child.tag === 'template') {
-          slot.push.apply(slot, child.children || []);
-        } else {
-          slot.push(child);
+    var scopedSlotFn = this.$scopedSlots[name];
+    var nodes;
+    if (scopedSlotFn) { // scoped slot
+      props = props || {};
+      if (bindObject) {
+        if (!isObject(bindObject)) {
+          warn(
+            'slot v-bind without argument expects an Object',
+            this
+          );
         }
-      } else {
-        (slots.default || (slots.default = [])).push(child);
-      }
-    }
-    // ignore slots that contains only whitespace
-    for (var name$1 in slots) {
-      if (slots[name$1].every(isWhitespace)) {
-        delete slots[name$1];
+        props = extend(extend({}, bindObject), props);
       }
+      nodes = scopedSlotFn(props) || fallback;
+    } else {
+      nodes = this.$slots[name] || fallback;
     }
-    return slots
-  }
-
-  function isWhitespace (node) {
-    return (node.isComment && !node.asyncFactory) || node.text === ' '
-  }
 
-  function resolveScopedSlots (
-    fns, // see flow/vnode
-    hasDynamicKeys,
-    res
-  ) {
-    res = res || { $stable: !hasDynamicKeys };
-    for (var i = 0; i < fns.length; i++) {
-      var slot = fns[i];
-      if (Array.isArray(slot)) {
-        resolveScopedSlots(slot, hasDynamicKeys, res);
-      } else if (slot) {
-        res[slot.key] = slot.fn;
-      }
+    var target = props && props.slot;
+    if (target) {
+      return this.$createElement('template', { slot: target }, nodes)
+    } else {
+      return nodes
     }
-    return res
   }
 
   /*  */
 
-  var activeInstance = null;
-  var isUpdatingChildComponent = false;
-
-  function setActiveInstance(vm) {
-    var prevActiveInstance = activeInstance;
-    activeInstance = vm;
-    return function () {
-      activeInstance = prevActiveInstance;
-    }
+  /**
+   * Runtime helper for resolving filters
+   */
+  function resolveFilter (id) {
+    return resolveAsset(this.$options, 'filters', id, true) || identity
   }
 
-  function initLifecycle (vm) {
-    var options = vm.$options;
+  /*  */
 
-    // locate first non-abstract parent
-    var parent = options.parent;
-    if (parent && !options.abstract) {
-      while (parent.$options.abstract && parent.$parent) {
-        parent = parent.$parent;
-      }
-      parent.$children.push(vm);
+  function isKeyNotMatch (expect, actual) {
+    if (Array.isArray(expect)) {
+      return expect.indexOf(actual) === -1
+    } else {
+      return expect !== actual
     }
+  }
 
-    vm.$parent = parent;
-    vm.$root = parent ? parent.$root : vm;
-
-    vm.$children = [];
-    vm.$refs = {};
-
-    vm._watcher = null;
-    vm._inactive = null;
-    vm._directInactive = false;
-    vm._isMounted = false;
-    vm._isDestroyed = false;
-    vm._isBeingDestroyed = false;
+  /**
+   * Runtime helper for checking keyCodes from config.
+   * exposed as Vue.prototype._k
+   * passing in eventKeyName as last argument separately for backwards compat
+   */
+  function checkKeyCodes (
+    eventKeyCode,
+    key,
+    builtInKeyCode,
+    eventKeyName,
+    builtInKeyName
+  ) {
+    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+      return isKeyNotMatch(builtInKeyName, eventKeyName)
+    } else if (mappedKeyCode) {
+      return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+    } else if (eventKeyName) {
+      return hyphenate(eventKeyName) !== key
+    }
   }
 
-  function lifecycleMixin (Vue) {
-    Vue.prototype._update = function (vnode, hydrating) {
-      var vm = this;
-      var prevEl = vm.$el;
-      var prevVnode = vm._vnode;
-      var restoreActiveInstance = setActiveInstance(vm);
-      vm._vnode = vnode;
-      // Vue.prototype.__patch__ is injected in entry points
-      // based on the rendering backend used.
-      if (!prevVnode) {
-        // initial render
-        vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+  /*  */
+
+  /**
+   * Runtime helper for merging v-bind="object" into a VNode's data.
+   */
+  function bindObjectProps (
+    data,
+    tag,
+    value,
+    asProp,
+    isSync
+  ) {
+    if (value) {
+      if (!isObject(value)) {
+        warn(
+          'v-bind without argument expects an Object or Array value',
+          this
+        );
       } else {
-        // updates
-        vm.$el = vm.__patch__(prevVnode, vnode);
-      }
-      restoreActiveInstance();
-      // update __vue__ reference
-      if (prevEl) {
-        prevEl.__vue__ = null;
-      }
-      if (vm.$el) {
-        vm.$el.__vue__ = vm;
-      }
-      // if parent is an HOC, update its $el as well
-      if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
-        vm.$parent.$el = vm.$el;
-      }
-      // updated hook is called by the scheduler to ensure that children are
-      // updated in a parent's updated hook.
-    };
+        if (Array.isArray(value)) {
+          value = toObject(value);
+        }
+        var hash;
+        var loop = function ( key ) {
+          if (
+            key === 'class' ||
+            key === 'style' ||
+            isReservedAttribute(key)
+          ) {
+            hash = data;
+          } else {
+            var type = data.attrs && data.attrs.type;
+            hash = asProp || config.mustUseProp(tag, type, key)
+              ? data.domProps || (data.domProps = {})
+              : data.attrs || (data.attrs = {});
+          }
+          var camelizedKey = camelize(key);
+          if (!(key in hash) && !(camelizedKey in hash)) {
+            hash[key] = value[key];
 
-    Vue.prototype.$forceUpdate = function () {
-      var vm = this;
-      if (vm._watcher) {
-        vm._watcher.update();
-      }
-    };
+            if (isSync) {
+              var on = data.on || (data.on = {});
+              on[("update:" + camelizedKey)] = function ($event) {
+                value[key] = $event;
+              };
+            }
+          }
+        };
 
-    Vue.prototype.$destroy = function () {
-      var vm = this;
-      if (vm._isBeingDestroyed) {
-        return
-      }
-      callHook(vm, 'beforeDestroy');
-      vm._isBeingDestroyed = true;
-      // remove self from parent
-      var parent = vm.$parent;
-      if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
-        remove(parent.$children, vm);
-      }
-      // teardown watchers
-      if (vm._watcher) {
-        vm._watcher.teardown();
-      }
-      var i = vm._watchers.length;
-      while (i--) {
-        vm._watchers[i].teardown();
-      }
-      // remove reference from data ob
-      // frozen object may not have observer.
-      if (vm._data.__ob__) {
-        vm._data.__ob__.vmCount--;
-      }
-      // call the last hook...
-      vm._isDestroyed = true;
-      // invoke destroy hooks on current rendered tree
-      vm.__patch__(vm._vnode, null);
-      // fire destroyed hook
-      callHook(vm, 'destroyed');
-      // turn off all instance listeners.
-      vm.$off();
-      // remove __vue__ reference
-      if (vm.$el) {
-        vm.$el.__vue__ = null;
-      }
-      // release circular reference (#6759)
-      if (vm.$vnode) {
-        vm.$vnode.parent = null;
+        for (var key in value) loop( key );
       }
-    };
+    }
+    return data
   }
 
-  function mountComponent (
-    vm,
-    el,
-    hydrating
+  /*  */
+
+  /**
+   * Runtime helper for rendering static trees.
+   */
+  function renderStatic (
+    index,
+    isInFor
   ) {
-    vm.$el = el;
-    if (!vm.$options.render) {
-      vm.$options.render = createEmptyVNode;
-      {
-        /* istanbul ignore if */
-        if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
-          vm.$options.el || el) {
-          warn(
-            'You are using the runtime-only build of Vue where the template ' +
-            'compiler is not available. Either pre-compile the templates into ' +
-            'render functions, or use the compiler-included build.',
-            vm
-          );
-        } else {
-          warn(
-            'Failed to mount component: template or render function not defined.',
-            vm
-          );
-        }
-      }
+    var cached = this._staticTrees || (this._staticTrees = []);
+    var tree = cached[index];
+    // if has already-rendered static tree and not inside v-for,
+    // we can reuse the same tree.
+    if (tree && !isInFor) {
+      return tree
     }
-    callHook(vm, 'beforeMount');
-
-    var updateComponent;
-    /* istanbul ignore if */
-    if (config.performance && mark) {
-      updateComponent = function () {
-        var name = vm._name;
-        var id = vm._uid;
-        var startTag = "vue-perf-start:" + id;
-        var endTag = "vue-perf-end:" + id;
+    // otherwise, render a fresh tree.
+    tree = cached[index] = this.$options.staticRenderFns[index].call(
+      this._renderProxy,
+      null,
+      this // for render fns generated for functional component templates
+    );
+    markStatic(tree, ("__static__" + index), false);
+    return tree
+  }
 
-        mark(startTag);
-        var vnode = vm._render();
-        mark(endTag);
-        measure(("vue " + name + " render"), startTag, endTag);
+  /**
+   * Runtime helper for v-once.
+   * Effectively it means marking the node as static with a unique key.
+   */
+  function markOnce (
+    tree,
+    index,
+    key
+  ) {
+    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+    return tree
+  }
 
-        mark(startTag);
-        vm._update(vnode, hydrating);
-        mark(endTag);
-        measure(("vue " + name + " patch"), startTag, endTag);
-      };
+  function markStatic (
+    tree,
+    key,
+    isOnce
+  ) {
+    if (Array.isArray(tree)) {
+      for (var i = 0; i < tree.length; i++) {
+        if (tree[i] && typeof tree[i] !== 'string') {
+          markStaticNode(tree[i], (key + "_" + i), isOnce);
+        }
+      }
     } else {
-      updateComponent = function () {
-        vm._update(vm._render(), hydrating);
-      };
+      markStaticNode(tree, key, isOnce);
     }
+  }
 
-    // we set this to vm._watcher inside the watcher's constructor
-    // since the watcher's initial patch may call $forceUpdate (e.g. inside child
-    // component's mounted hook), which relies on vm._watcher being already defined
-    new Watcher(vm, updateComponent, noop, {
-      before: function before () {
-        if (vm._isMounted && !vm._isDestroyed) {
-          callHook(vm, 'beforeUpdate');
+  function markStaticNode (node, key, isOnce) {
+    node.isStatic = true;
+    node.key = key;
+    node.isOnce = isOnce;
+  }
+
+  /*  */
+
+  function bindObjectListeners (data, value) {
+    if (value) {
+      if (!isPlainObject(value)) {
+        warn(
+          'v-on without argument expects an Object value',
+          this
+        );
+      } else {
+        var on = data.on = data.on ? extend({}, data.on) : {};
+        for (var key in value) {
+          var existing = on[key];
+          var ours = value[key];
+          on[key] = existing ? [].concat(existing, ours) : ours;
         }
       }
-    }, true /* isRenderWatcher */);
-    hydrating = false;
-
-    // manually mounted instance, call mounted on self
-    // mounted is called for render-created child components in its inserted hook
-    if (vm.$vnode == null) {
-      vm._isMounted = true;
-      callHook(vm, 'mounted');
     }
-    return vm
+    return data
   }
 
-  function updateChildComponent (
-    vm,
-    propsData,
-    listeners,
-    parentVnode,
-    renderChildren
+  /*  */
+
+  function resolveScopedSlots (
+    fns, // see flow/vnode
+    hasDynamicKeys,
+    res
   ) {
-    {
-      isUpdatingChildComponent = true;
+    res = res || { $stable: !hasDynamicKeys };
+    for (var i = 0; i < fns.length; i++) {
+      var slot = fns[i];
+      if (Array.isArray(slot)) {
+        resolveScopedSlots(slot, hasDynamicKeys, res);
+      } else if (slot) {
+        res[slot.key] = slot.fn;
+      }
     }
+    return res
+  }
 
-    // determine whether component has slot children
-    // we need to do this before overwriting $options._renderChildren.
+  /*  */
 
-    // check if there are dynamic scopedSlots (hand-written or compiled but with
-    // dynamic slot names). Static scoped slots compiled from template has the
-    // "$stable" marker.
-    var hasDynamicScopedSlot = !!(
-      (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-      (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-    );
-    // Any static slot children from the parent may have changed during parent's
-    // update. Dynamic scoped slots may also have changed. In such cases, a forced
-    // update is necessary to ensure correctness.
-    var needsForceUpdate = !!(
-      renderChildren ||               // has new static slots
-      vm.$options._renderChildren ||  // has old static slots
-      hasDynamicScopedSlot
-    );
+  function bindDynamicKeys (baseObj, values) {
+    for (var i = 0; i < values.length; i += 2) {
+      var key = values[i];
+      if (typeof key === 'string' && key) {
+        baseObj[values[i]] = values[i + 1];
+      } else if (key !== '' && key !== null) {
+        // null is a speical value for explicitly removing a binding
+        warn(
+          ("Invalid value for dynamic directive argument (expected string or null): " + key),
+          this
+        );
+      }
+    }
+    return baseObj
+  }
 
-    vm.$options._parentVnode = parentVnode;
-    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+  // helper to dynamically append modifier runtime markers to event names.
+  // ensure only append when value is already string, otherwise it will be cast
+  // to string and cause the type check to miss.
+  function prependModifier (value, symbol) {
+    return typeof value === 'string' ? symbol + value : value
+  }
 
-    if (vm._vnode) { // update child tree's parent
-      vm._vnode.parent = parentVnode;
-    }
-    vm.$options._renderChildren = renderChildren;
+  /*  */
 
-    // update $attrs and $listeners hash
-    // these are also reactive so they may trigger child update if the child
-    // used them during render
-    vm.$attrs = parentVnode.data.attrs || emptyObject;
-    vm.$listeners = listeners || emptyObject;
+  function installRenderHelpers (target) {
+    target._o = markOnce;
+    target._n = toNumber;
+    target._s = toString;
+    target._l = renderList;
+    target._t = renderSlot;
+    target._q = looseEqual;
+    target._i = looseIndexOf;
+    target._m = renderStatic;
+    target._f = resolveFilter;
+    target._k = checkKeyCodes;
+    target._b = bindObjectProps;
+    target._v = createTextVNode;
+    target._e = createEmptyVNode;
+    target._u = resolveScopedSlots;
+    target._g = bindObjectListeners;
+    target._d = bindDynamicKeys;
+    target._p = prependModifier;
+  }
 
-    // update props
-    if (propsData && vm.$options.props) {
-      toggleObserving(false);
-      var props = vm._props;
-      var propKeys = vm.$options._propKeys || [];
-      for (var i = 0; i < propKeys.length; i++) {
-        var key = propKeys[i];
-        var propOptions = vm.$options.props; // wtf flow?
-        props[key] = validateProp(key, propOptions, propsData, vm);
-      }
-      toggleObserving(true);
-      // keep a copy of raw propsData
-      vm.$options.propsData = propsData;
+  /*  */
+
+  function FunctionalRenderContext (
+    data,
+    props,
+    children,
+    parent,
+    Ctor
+  ) {
+    var options = Ctor.options;
+    // ensure the createElement function in functional components
+    // gets a unique context - this is necessary for correct named slot check
+    var contextVm;
+    if (hasOwn(parent, '_uid')) {
+      contextVm = Object.create(parent);
+      // $flow-disable-line
+      contextVm._original = parent;
+    } else {
+      // the context vm passed in is a functional context as well.
+      // in this case we want to make sure we are able to get a hold to the
+      // real context instance.
+      contextVm = parent;
+      // $flow-disable-line
+      parent = parent._original;
     }
+    var isCompiled = isTrue(options._compiled);
+    var needNormalization = !isCompiled;
 
-    // update listeners
-    listeners = listeners || emptyObject;
-    var oldListeners = vm.$options._parentListeners;
-    vm.$options._parentListeners = listeners;
-    updateComponentListeners(vm, listeners, oldListeners);
+    this.data = data;
+    this.props = props;
+    this.children = children;
+    this.parent = parent;
+    this.listeners = data.on || emptyObject;
+    this.injections = resolveInject(options.inject, parent);
+    this.slots = function () { return resolveSlots(children, parent); };
 
-    // resolve slots + force update if has children
-    if (needsForceUpdate) {
-      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-      vm.$forceUpdate();
-    }
+    Object.defineProperty(this, 'scopedSlots', ({
+      enumerable: true,
+      get: function get () {
+        return normalizeScopedSlots(data.scopedSlots, this.slots())
+      }
+    }));
 
-    {
-      isUpdatingChildComponent = false;
+    // support for compiled functional template
+    if (isCompiled) {
+      // exposing $options for renderStatic()
+      this.$options = options;
+      // pre-resolve slots for renderSlot()
+      this.$slots = this.slots();
+      this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
     }
-  }
 
-  function isInInactiveTree (vm) {
-    while (vm && (vm = vm.$parent)) {
-      if (vm._inactive) { return true }
+    if (options._scopeId) {
+      this._c = function (a, b, c, d) {
+        var vnode = createElement(contextVm, a, b, c, d, needNormalization);
+        if (vnode && !Array.isArray(vnode)) {
+          vnode.fnScopeId = options._scopeId;
+          vnode.fnContext = parent;
+        }
+        return vnode
+      };
+    } else {
+      this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
     }
-    return false
   }
 
-  function activateChildComponent (vm, direct) {
-    if (direct) {
-      vm._directInactive = false;
-      if (isInInactiveTree(vm)) {
-        return
+  installRenderHelpers(FunctionalRenderContext.prototype);
+
+  function createFunctionalComponent (
+    Ctor,
+    propsData,
+    data,
+    contextVm,
+    children
+  ) {
+    var options = Ctor.options;
+    var props = {};
+    var propOptions = options.props;
+    if (isDef(propOptions)) {
+      for (var key in propOptions) {
+        props[key] = validateProp(key, propOptions, propsData || emptyObject);
       }
-    } else if (vm._directInactive) {
-      return
+    } else {
+      if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
+      if (isDef(data.props)) { mergeProps(props, data.props); }
     }
-    if (vm._inactive || vm._inactive === null) {
-      vm._inactive = false;
-      for (var i = 0; i < vm.$children.length; i++) {
-        activateChildComponent(vm.$children[i]);
+
+    var renderContext = new FunctionalRenderContext(
+      data,
+      props,
+      children,
+      contextVm,
+      Ctor
+    );
+
+    var vnode = options.render.call(null, renderContext._c, renderContext);
+
+    if (vnode instanceof VNode) {
+      return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
+    } else if (Array.isArray(vnode)) {
+      var vnodes = normalizeChildren(vnode) || [];
+      var res = new Array(vnodes.length);
+      for (var i = 0; i < vnodes.length; i++) {
+        res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
       }
-      callHook(vm, 'activated');
+      return res
     }
   }
 
-  function deactivateChildComponent (vm, direct) {
-    if (direct) {
-      vm._directInactive = true;
-      if (isInInactiveTree(vm)) {
-        return
-      }
+  function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
+    // #7817 clone node before setting fnContext, otherwise if the node is reused
+    // (e.g. it was from a cached normal slot) the fnContext causes named slots
+    // that should not be matched to match.
+    var clone = cloneVNode(vnode);
+    clone.fnContext = contextVm;
+    clone.fnOptions = options;
+    {
+      (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
     }
-    if (!vm._inactive) {
-      vm._inactive = true;
-      for (var i = 0; i < vm.$children.length; i++) {
-        deactivateChildComponent(vm.$children[i]);
-      }
-      callHook(vm, 'deactivated');
+    if (data.slot) {
+      (clone.data || (clone.data = {})).slot = data.slot;
     }
+    return clone
   }
 
-  function callHook (vm, hook) {
-    // #7573 disable dep collection when invoking lifecycle hooks
-    pushTarget();
-    var handlers = vm.$options[hook];
-    var info = hook + " hook";
-    if (handlers) {
-      for (var i = 0, j = handlers.length; i < j; i++) {
-        invokeWithErrorHandling(handlers[i], vm, null, vm, info);
-      }
-    }
-    if (vm._hasHookEvent) {
-      vm.$emit('hook:' + hook);
+  function mergeProps (to, from) {
+    for (var key in from) {
+      to[camelize(key)] = from[key];
     }
-    popTarget();
   }
 
   /*  */
 
-  var MAX_UPDATE_COUNT = 100;
+  /*  */
 
-  var queue = [];
-  var activatedChildren = [];
-  var has = {};
-  var circular = {};
-  var waiting = false;
-  var flushing = false;
-  var index = 0;
+  /*  */
 
-  /**
-   * Reset the scheduler's state.
-   */
-  function resetSchedulerState () {
-    index = queue.length = activatedChildren.length = 0;
-    has = {};
-    {
-      circular = {};
-    }
-    waiting = flushing = false;
-  }
+  /*  */
 
-  // Async edge case #6566 requires saving the timestamp when event listeners are
-  // attached. However, calling performance.now() has a perf overhead especially
-  // if the page has thousands of event listeners. Instead, we take a timestamp
-  // every time the scheduler flushes and use that for all event listeners
-  // attached during that flush.
-  var currentFlushTimestamp = 0;
+  // inline hooks to be invoked on component VNodes during patch
+  var componentVNodeHooks = {
+    init: function init (vnode, hydrating) {
+      if (
+        vnode.componentInstance &&
+        !vnode.componentInstance._isDestroyed &&
+        vnode.data.keepAlive
+      ) {
+        // kept-alive components, treat as a patch
+        var mountedNode = vnode; // work around flow
+        componentVNodeHooks.prepatch(mountedNode, mountedNode);
+      } else {
+        var child = vnode.componentInstance = createComponentInstanceForVnode(
+          vnode,
+          activeInstance
+        );
+        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
+      }
+    },
 
-  // Async edge case fix requires storing an event listener's attach timestamp.
-  var getNow = Date.now;
+    prepatch: function prepatch (oldVnode, vnode) {
+      var options = vnode.componentOptions;
+      var child = vnode.componentInstance = oldVnode.componentInstance;
+      updateChildComponent(
+        child,
+        options.propsData, // updated props
+        options.listeners, // updated listeners
+        vnode, // new parent vnode
+        options.children // new children
+      );
+    },
 
-  // Determine what event timestamp the browser is using. Annoyingly, the
-  // timestamp can either be hi-res ( relative to poge load) or low-res
-  // (relative to UNIX epoch), so in order to compare time we have to use the
-  // same timestamp type when saving the flush timestamp.
-  if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-    // if the low-res timestamp which is bigger than the event timestamp
-    // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-    // and we need to use the hi-res version for event listeners as well.
-    getNow = function () { return performance.now(); };
-  }
+    insert: function insert (vnode) {
+      var context = vnode.context;
+      var componentInstance = vnode.componentInstance;
+      if (!componentInstance._isMounted) {
+        componentInstance._isMounted = true;
+        callHook(componentInstance, 'mounted');
+      }
+      if (vnode.data.keepAlive) {
+        if (context._isMounted) {
+          // vue-router#1212
+          // During updates, a kept-alive component's child components may
+          // change, so directly walking the tree here may call activated hooks
+          // on incorrect children. Instead we push them into a queue which will
+          // be processed after the whole patch process ended.
+          queueActivatedComponent(componentInstance);
+        } else {
+          activateChildComponent(componentInstance, true /* direct */);
+        }
+      }
+    },
 
-  /**
-   * Flush both queues and run the watchers.
-   */
-  function flushSchedulerQueue () {
-    currentFlushTimestamp = getNow();
-    flushing = true;
-    var watcher, id;
+    destroy: function destroy (vnode) {
+      var componentInstance = vnode.componentInstance;
+      if (!componentInstance._isDestroyed) {
+        if (!vnode.data.keepAlive) {
+          componentInstance.$destroy();
+        } else {
+          deactivateChildComponent(componentInstance, true /* direct */);
+        }
+      }
+    }
+  };
 
-    // Sort queue before flush.
-    // This ensures that:
-    // 1. Components are updated from parent to child. (because parent is always
-    //    created before the child)
-    // 2. A component's user watchers are run before its render watcher (because
-    //    user watchers are created before the render watcher)
-    // 3. If a component is destroyed during a parent component's watcher run,
-    //    its watchers can be skipped.
-    queue.sort(function (a, b) { return a.id - b.id; });
+  var hooksToMerge = Object.keys(componentVNodeHooks);
 
-    // do not cache length because more watchers might be pushed
-    // as we run existing watchers
-    for (index = 0; index < queue.length; index++) {
-      watcher = queue[index];
-      if (watcher.before) {
-        watcher.before();
+  function createComponent (
+    Ctor,
+    data,
+    context,
+    children,
+    tag
+  ) {
+    if (isUndef(Ctor)) {
+      return
+    }
+
+    var baseCtor = context.$options._base;
+
+    // plain options object: turn it into a constructor
+    if (isObject(Ctor)) {
+      Ctor = baseCtor.extend(Ctor);
+    }
+
+    // if at this stage it's not a constructor or an async component factory,
+    // reject.
+    if (typeof Ctor !== 'function') {
+      {
+        warn(("Invalid Component definition: " + (String(Ctor))), context);
       }
-      id = watcher.id;
-      has[id] = null;
-      watcher.run();
-      // in dev build, check and stop circular updates.
-      if (has[id] != null) {
-        circular[id] = (circular[id] || 0) + 1;
-        if (circular[id] > MAX_UPDATE_COUNT) {
-          warn(
-            'You may have an infinite update loop ' + (
-              watcher.user
-                ? ("in watcher with expression \"" + (watcher.expression) + "\"")
-                : "in a component render function."
-            ),
-            watcher.vm
-          );
-          break
-        }
+      return
+    }
+
+    // async component
+    var asyncFactory;
+    if (isUndef(Ctor.cid)) {
+      asyncFactory = Ctor;
+      Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
+      if (Ctor === undefined) {
+        // return a placeholder node for async component, which is rendered
+        // as a comment node but preserves all the raw information for the node.
+        // the information will be used for async server-rendering and hydration.
+        return createAsyncPlaceholder(
+          asyncFactory,
+          data,
+          context,
+          children,
+          tag
+        )
       }
     }
 
-    // keep copies of post queues before resetting state
-    var activatedQueue = activatedChildren.slice();
-    var updatedQueue = queue.slice();
+    data = data || {};
 
-    resetSchedulerState();
+    // resolve constructor options in case global mixins are applied after
+    // component constructor creation
+    resolveConstructorOptions(Ctor);
 
-    // call component updated and activated hooks
-    callActivatedHooks(activatedQueue);
-    callUpdatedHooks(updatedQueue);
+    // transform component v-model data into props & events
+    if (isDef(data.model)) {
+      transformModel(Ctor.options, data);
+    }
 
-    // devtool hook
-    /* istanbul ignore if */
-    if (devtools && config.devtools) {
-      devtools.emit('flush');
+    // extract props
+    var propsData = extractPropsFromVNodeData(data, Ctor, tag);
+
+    // functional component
+    if (isTrue(Ctor.options.functional)) {
+      return createFunctionalComponent(Ctor, propsData, data, context, children)
     }
-  }
 
-  function callUpdatedHooks (queue) {
-    var i = queue.length;
-    while (i--) {
-      var watcher = queue[i];
-      var vm = watcher.vm;
-      if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
-        callHook(vm, 'updated');
+    // extract listeners, since these needs to be treated as
+    // child component listeners instead of DOM listeners
+    var listeners = data.on;
+    // replace with listeners with .native modifier
+    // so it gets processed during parent component patch.
+    data.on = data.nativeOn;
+
+    if (isTrue(Ctor.options.abstract)) {
+      // abstract components do not keep anything
+      // other than props & listeners & slot
+
+      // work around flow
+      var slot = data.slot;
+      data = {};
+      if (slot) {
+        data.slot = slot;
       }
     }
-  }
 
-  /**
-   * Queue a kept-alive component that was activated during patch.
-   * The queue will be processed after the entire tree has been patched.
-   */
-  function queueActivatedComponent (vm) {
-    // setting _inactive to false here so that a render function can
-    // rely on checking whether it's in an inactive tree (e.g. router-view)
-    vm._inactive = false;
-    activatedChildren.push(vm);
+    // install component management hooks onto the placeholder node
+    installComponentHooks(data);
+
+    // return a placeholder vnode
+    var name = Ctor.options.name || tag;
+    var vnode = new VNode(
+      ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
+      data, undefined, undefined, undefined, context,
+      { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
+      asyncFactory
+    );
+
+    return vnode
   }
 
-  function callActivatedHooks (queue) {
-    for (var i = 0; i < queue.length; i++) {
-      queue[i]._inactive = true;
-      activateChildComponent(queue[i], true /* true */);
+  function createComponentInstanceForVnode (
+    vnode, // we know it's MountedComponentVNode but flow doesn't
+    parent // activeInstance in lifecycle state
+  ) {
+    var options = {
+      _isComponent: true,
+      _parentVnode: vnode,
+      parent: parent
+    };
+    // check inline-template render functions
+    var inlineTemplate = vnode.data.inlineTemplate;
+    if (isDef(inlineTemplate)) {
+      options.render = inlineTemplate.render;
+      options.staticRenderFns = inlineTemplate.staticRenderFns;
     }
+    return new vnode.componentOptions.Ctor(options)
   }
 
-  /**
-   * Push a watcher into the watcher queue.
-   * Jobs with duplicate IDs will be skipped unless it's
-   * pushed when the queue is being flushed.
-   */
-  function queueWatcher (watcher) {
-    var id = watcher.id;
-    if (has[id] == null) {
-      has[id] = true;
-      if (!flushing) {
-        queue.push(watcher);
-      } else {
-        // if already flushing, splice the watcher based on its id
-        // if already past its id, it will be run next immediately.
-        var i = queue.length - 1;
-        while (i > index && queue[i].id > watcher.id) {
-          i--;
-        }
-        queue.splice(i + 1, 0, watcher);
+  function installComponentHooks (data) {
+    var hooks = data.hook || (data.hook = {});
+    for (var i = 0; i < hooksToMerge.length; i++) {
+      var key = hooksToMerge[i];
+      var existing = hooks[key];
+      var toMerge = componentVNodeHooks[key];
+      if (existing !== toMerge && !(existing && existing._merged)) {
+        hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
       }
-      // queue the flush
-      if (!waiting) {
-        waiting = true;
+    }
+  }
 
-        if (!config.async) {
-          flushSchedulerQueue();
-          return
-        }
-        nextTick(flushSchedulerQueue);
+  function mergeHook$1 (f1, f2) {
+    var merged = function (a, b) {
+      // flow complains about extra args which is why we use any
+      f1(a, b);
+      f2(a, b);
+    };
+    merged._merged = true;
+    return merged
+  }
+
+  // transform component v-model info (value and callback) into
+  // prop and event handler respectively.
+  function transformModel (options, data) {
+    var prop = (options.model && options.model.prop) || 'value';
+    var event = (options.model && options.model.event) || 'input'
+    ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
+    var on = data.on || (data.on = {});
+    var existing = on[event];
+    var callback = data.model.callback;
+    if (isDef(existing)) {
+      if (
+        Array.isArray(existing)
+          ? existing.indexOf(callback) === -1
+          : existing !== callback
+      ) {
+        on[event] = [callback].concat(existing);
       }
+    } else {
+      on[event] = callback;
     }
   }
 
   /*  */
 
+  var SIMPLE_NORMALIZE = 1;
+  var ALWAYS_NORMALIZE = 2;
 
+  // wrapper function for providing a more flexible interface
+  // without getting yelled at by flow
+  function createElement (
+    context,
+    tag,
+    data,
+    children,
+    normalizationType,
+    alwaysNormalize
+  ) {
+    if (Array.isArray(data) || isPrimitive(data)) {
+      normalizationType = children;
+      children = data;
+      data = undefined;
+    }
+    if (isTrue(alwaysNormalize)) {
+      normalizationType = ALWAYS_NORMALIZE;
+    }
+    return _createElement(context, tag, data, children, normalizationType)
+  }
 
-  var uid$1 = 0;
-
-  /**
-   * A watcher parses an expression, collects dependencies,
-   * and fires callback when the expression value changes.
-   * This is used for both the $watch() api and directives.
-   */
-  var Watcher = function Watcher (
-    vm,
-    expOrFn,
-    cb,
-    options,
-    isRenderWatcher
+  function _createElement (
+    context,
+    tag,
+    data,
+    children,
+    normalizationType
   ) {
-    this.vm = vm;
-    if (isRenderWatcher) {
-      vm._watcher = this;
+    if (isDef(data) && isDef((data).__ob__)) {
+      warn(
+        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+        'Always create fresh vnode data objects in each render!',
+        context
+      );
+      return createEmptyVNode()
     }
-    vm._watchers.push(this);
-    // options
-    if (options) {
-      this.deep = !!options.deep;
-      this.user = !!options.user;
-      this.lazy = !!options.lazy;
-      this.sync = !!options.sync;
-      this.before = options.before;
-    } else {
-      this.deep = this.user = this.lazy = this.sync = false;
+    // object syntax in v-bind
+    if (isDef(data) && isDef(data.is)) {
+      tag = data.is;
     }
-    this.cb = cb;
-    this.id = ++uid$1; // uid for batching
-    this.active = true;
-    this.dirty = this.lazy; // for lazy watchers
-    this.deps = [];
-    this.newDeps = [];
-    this.depIds = new _Set();
-    this.newDepIds = new _Set();
-    this.expression = expOrFn.toString();
-    // parse expression for getter
-    if (typeof expOrFn === 'function') {
-      this.getter = expOrFn;
-    } else {
-      this.getter = parsePath(expOrFn);
-      if (!this.getter) {
-        this.getter = noop;
+    if (!tag) {
+      // in case of component :is set to falsy value
+      return createEmptyVNode()
+    }
+    // warn against non-primitive key
+    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+    ) {
+      {
         warn(
-          "Failed watching path: \"" + expOrFn + "\" " +
-          'Watcher only accepts simple dot-delimited paths. ' +
-          'For full control, use a function instead.',
-          vm
+          'Avoid using non-primitive value as key, ' +
+          'use string/number value instead.',
+          context
         );
       }
     }
-    this.value = this.lazy
-      ? undefined
-      : this.get();
-  };
-
-  /**
-   * Evaluate the getter, and re-collect dependencies.
-   */
-  Watcher.prototype.get = function get () {
-    pushTarget(this);
-    var value;
-    var vm = this.vm;
-    try {
-      value = this.getter.call(vm, vm);
-    } catch (e) {
-      if (this.user) {
-        handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+    // support single function children as default scoped slot
+    if (Array.isArray(children) &&
+      typeof children[0] === 'function'
+    ) {
+      data = data || {};
+      data.scopedSlots = { default: children[0] };
+      children.length = 0;
+    }
+    if (normalizationType === ALWAYS_NORMALIZE) {
+      children = normalizeChildren(children);
+    } else if (normalizationType === SIMPLE_NORMALIZE) {
+      children = simpleNormalizeChildren(children);
+    }
+    var vnode, ns;
+    if (typeof tag === 'string') {
+      var Ctor;
+      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+      if (config.isReservedTag(tag)) {
+        // platform built-in elements
+        vnode = new VNode(
+          config.parsePlatformTagName(tag), data, children,
+          undefined, undefined, context
+        );
+      } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+        // component
+        vnode = createComponent(Ctor, data, context, children, tag);
       } else {
-        throw e
-      }
-    } finally {
-      // "touch" every property so they are all tracked as
-      // dependencies for deep watching
-      if (this.deep) {
-        traverse(value);
+        // unknown or unlisted namespaced elements
+        // check at runtime because it may get assigned a namespace when its
+        // parent normalizes children
+        vnode = new VNode(
+          tag, data, children,
+          undefined, undefined, context
+        );
       }
-      popTarget();
-      this.cleanupDeps();
+    } else {
+      // direct component options / constructor
+      vnode = createComponent(tag, data, context, children);
     }
-    return value
-  };
+    if (Array.isArray(vnode)) {
+      return vnode
+    } else if (isDef(vnode)) {
+      if (isDef(ns)) { applyNS(vnode, ns); }
+      if (isDef(data)) { registerDeepBindings(data); }
+      return vnode
+    } else {
+      return createEmptyVNode()
+    }
+  }
 
-  /**
-   * Add a dependency to this directive.
-   */
-  Watcher.prototype.addDep = function addDep (dep) {
-    var id = dep.id;
-    if (!this.newDepIds.has(id)) {
-      this.newDepIds.add(id);
-      this.newDeps.push(dep);
-      if (!this.depIds.has(id)) {
-        dep.addSub(this);
+  function applyNS (vnode, ns, force) {
+    vnode.ns = ns;
+    if (vnode.tag === 'foreignObject') {
+      // use default namespace inside foreignObject
+      ns = undefined;
+      force = true;
+    }
+    if (isDef(vnode.children)) {
+      for (var i = 0, l = vnode.children.length; i < l; i++) {
+        var child = vnode.children[i];
+        if (isDef(child.tag) && (
+          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+          applyNS(child, ns, force);
+        }
       }
     }
-  };
+  }
 
-  /**
-   * Clean up for dependency collection.
-   */
-  Watcher.prototype.cleanupDeps = function cleanupDeps () {
-    var i = this.deps.length;
-    while (i--) {
-      var dep = this.deps[i];
-      if (!this.newDepIds.has(dep.id)) {
-        dep.removeSub(this);
-      }
+  // ref #5318
+  // necessary to ensure parent re-render when deep bindings like :style and
+  // :class are used on slot nodes
+  function registerDeepBindings (data) {
+    if (isObject(data.style)) {
+      traverse(data.style);
     }
-    var tmp = this.depIds;
-    this.depIds = this.newDepIds;
-    this.newDepIds = tmp;
-    this.newDepIds.clear();
-    tmp = this.deps;
-    this.deps = this.newDeps;
-    this.newDeps = tmp;
-    this.newDeps.length = 0;
-  };
+    if (isObject(data.class)) {
+      traverse(data.class);
+    }
+  }
+
+  /*  */
+
+  function initRender (vm) {
+    vm._vnode = null; // the root of the child tree
+    vm._staticTrees = null; // v-once cached trees
+    var options = vm.$options;
+    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
+    var renderContext = parentVnode && parentVnode.context;
+    vm.$slots = resolveSlots(options._renderChildren, renderContext);
+    vm.$scopedSlots = emptyObject;
+    // bind the createElement fn to this instance
+    // so that we get proper render context inside it.
+    // args order: tag, data, children, normalizationType, alwaysNormalize
+    // internal version is used by render functions compiled from templates
+    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
+    // normalization is always applied for the public version, used in
+    // user-written render functions.
+    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+
+    // $attrs & $listeners are exposed for easier HOC creation.
+    // they need to be reactive so that HOCs using them are always updated
+    var parentData = parentVnode && parentVnode.data;
 
-  /**
-   * Subscriber interface.
-   * Will be called when a dependency changes.
-   */
-  Watcher.prototype.update = function update () {
     /* istanbul ignore else */
-    if (this.lazy) {
-      this.dirty = true;
-    } else if (this.sync) {
-      this.run();
-    } else {
-      queueWatcher(this);
+    {
+      defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
+        !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
+      }, true);
+      defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
+        !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
+      }, true);
     }
-  };
+  }
 
-  /**
-   * Scheduler job interface.
-   * Will be called by the scheduler.
-   */
-  Watcher.prototype.run = function run () {
-    if (this.active) {
-      var value = this.get();
-      if (
-        value !== this.value ||
-        // Deep watchers and watchers on Object/Arrays should fire even
-        // when the value is the same, because the value may
-        // have mutated.
-        isObject(value) ||
-        this.deep
-      ) {
-        // set new value
-        var oldValue = this.value;
-        this.value = value;
-        if (this.user) {
-          try {
-            this.cb.call(this.vm, value, oldValue);
-          } catch (e) {
-            handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
-          }
-        } else {
-          this.cb.call(this.vm, value, oldValue);
-        }
-      }
-    }
-  };
+  var currentRenderingInstance = null;
 
-  /**
-   * Evaluate the value of the watcher.
-   * This only gets called for lazy watchers.
-   */
-  Watcher.prototype.evaluate = function evaluate () {
-    this.value = this.get();
-    this.dirty = false;
-  };
+  function renderMixin (Vue) {
+    // install runtime convenience helpers
+    installRenderHelpers(Vue.prototype);
 
-  /**
-   * Depend on all deps collected by this watcher.
-   */
-  Watcher.prototype.depend = function depend () {
-    var i = this.deps.length;
-    while (i--) {
-      this.deps[i].depend();
-    }
-  };
+    Vue.prototype.$nextTick = function (fn) {
+      return nextTick(fn, this)
+    };
 
-  /**
-   * Remove self from all dependencies' subscriber list.
-   */
-  Watcher.prototype.teardown = function teardown () {
-    if (this.active) {
-      // remove self from vm's watcher list
-      // this is a somewhat expensive operation so we skip it
-      // if the vm is being destroyed.
-      if (!this.vm._isBeingDestroyed) {
-        remove(this.vm._watchers, this);
+    Vue.prototype._render = function () {
+      var vm = this;
+      var ref = vm.$options;
+      var render = ref.render;
+      var _parentVnode = ref._parentVnode;
+
+      if (_parentVnode) {
+        vm.$scopedSlots = normalizeScopedSlots(
+          _parentVnode.data.scopedSlots,
+          vm.$slots
+        );
       }
-      var i = this.deps.length;
-      while (i--) {
-        this.deps[i].removeSub(this);
+
+      // set parent vnode. this allows render functions to have access
+      // to the data on the placeholder node.
+      vm.$vnode = _parentVnode;
+      // render self
+      var vnode;
+      try {
+        // There's no need to maintain a stack becaues all render fns are called
+        // separately from one another. Nested component's render fns are called
+        // when parent component is patched.
+        currentRenderingInstance = vm;
+        vnode = render.call(vm._renderProxy, vm.$createElement);
+      } catch (e) {
+        handleError(e, vm, "render");
+        // return error render result,
+        // or previous vnode to prevent render error causing blank component
+        /* istanbul ignore else */
+        if (vm.$options.renderError) {
+          try {
+            vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
+          } catch (e) {
+            handleError(e, vm, "renderError");
+            vnode = vm._vnode;
+          }
+        } else {
+          vnode = vm._vnode;
+        }
+      } finally {
+        currentRenderingInstance = null;
       }
-      this.active = false;
-    }
-  };
+      // if the returned array contains only a single node, allow it
+      if (Array.isArray(vnode) && vnode.length === 1) {
+        vnode = vnode[0];
+      }
+      // return empty vnode in case the render function errored out
+      if (!(vnode instanceof VNode)) {
+        if (Array.isArray(vnode)) {
+          warn(
+            'Multiple root nodes returned from render function. Render function ' +
+            'should return a single root node.',
+            vm
+          );
+        }
+        vnode = createEmptyVNode();
+      }
+      // set parent
+      vnode.parent = _parentVnode;
+      return vnode
+    };
+  }
 
   /*  */
 
-  var sharedPropertyDefinition = {
-    enumerable: true,
-    configurable: true,
-    get: noop,
-    set: noop
-  };
+  function ensureCtor (comp, base) {
+    if (
+      comp.__esModule ||
+      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+    ) {
+      comp = comp.default;
+    }
+    return isObject(comp)
+      ? base.extend(comp)
+      : comp
+  }
 
-  function proxy (target, sourceKey, key) {
-    sharedPropertyDefinition.get = function proxyGetter () {
-      return this[sourceKey][key]
-    };
-    sharedPropertyDefinition.set = function proxySetter (val) {
-      this[sourceKey][key] = val;
-    };
-    Object.defineProperty(target, key, sharedPropertyDefinition);
+  function createAsyncPlaceholder (
+    factory,
+    data,
+    context,
+    children,
+    tag
+  ) {
+    var node = createEmptyVNode();
+    node.asyncFactory = factory;
+    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+    return node
   }
 
-  function initState (vm) {
-    vm._watchers = [];
-    var opts = vm.$options;
-    if (opts.props) { initProps(vm, opts.props); }
-    if (opts.methods) { initMethods(vm, opts.methods); }
-    if (opts.data) {
-      initData(vm);
-    } else {
-      observe(vm._data = {}, true /* asRootData */);
+  function resolveAsyncComponent (
+    factory,
+    baseCtor
+  ) {
+    if (isTrue(factory.error) && isDef(factory.errorComp)) {
+      return factory.errorComp
     }
-    if (opts.computed) { initComputed(vm, opts.computed); }
-    if (opts.watch && opts.watch !== nativeWatch) {
-      initWatch(vm, opts.watch);
+
+    if (isDef(factory.resolved)) {
+      return factory.resolved
     }
-  }
 
-  function initProps (vm, propsOptions) {
-    var propsData = vm.$options.propsData || {};
-    var props = vm._props = {};
-    // cache prop keys so that future props updates can iterate using Array
-    // instead of dynamic object key enumeration.
-    var keys = vm.$options._propKeys = [];
-    var isRoot = !vm.$parent;
-    // root instance props should be converted
-    if (!isRoot) {
-      toggleObserving(false);
+    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+      return factory.loadingComp
     }
-    var loop = function ( key ) {
-      keys.push(key);
-      var value = validateProp(key, propsOptions, propsData, vm);
-      /* istanbul ignore else */
-      {
-        var hyphenatedKey = hyphenate(key);
-        if (isReservedAttribute(hyphenatedKey) ||
-            config.isReservedAttr(hyphenatedKey)) {
-          warn(
-            ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
-            vm
-          );
+
+    var owner = currentRenderingInstance;
+    if (isDef(factory.owners)) {
+      // already pending
+      factory.owners.push(owner);
+    } else {
+      var owners = factory.owners = [owner];
+      var sync = true;
+
+      var forceRender = function (renderCompleted) {
+        for (var i = 0, l = owners.length; i < l; i++) {
+          (owners[i]).$forceUpdate();
         }
-        defineReactive$$1(props, key, value, function () {
-          if (!isRoot && !isUpdatingChildComponent) {
-            warn(
-              "Avoid mutating a prop directly since the value will be " +
-              "overwritten whenever the parent component re-renders. " +
-              "Instead, use a data or computed property based on the prop's " +
-              "value. Prop being mutated: \"" + key + "\"",
-              vm
-            );
-          }
-        });
-      }
-      // static props are already proxied on the component's prototype
-      // during Vue.extend(). We only need to proxy props defined at
-      // instantiation here.
-      if (!(key in vm)) {
-        proxy(vm, "_props", key);
-      }
-    };
 
-    for (var key in propsOptions) loop( key );
-    toggleObserving(true);
-  }
+        if (renderCompleted) {
+          owners.length = 0;
+        }
+      };
 
-  function initData (vm) {
-    var data = vm.$options.data;
-    data = vm._data = typeof data === 'function'
-      ? getData(data, vm)
-      : data || {};
-    if (!isPlainObject(data)) {
-      data = {};
-      warn(
-        'data functions should return an object:\n' +
-        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
-        vm
-      );
-    }
-    // proxy data on instance
-    var keys = Object.keys(data);
-    var props = vm.$options.props;
-    var methods = vm.$options.methods;
-    var i = keys.length;
-    while (i--) {
-      var key = keys[i];
-      {
-        if (methods && hasOwn(methods, key)) {
-          warn(
-            ("Method \"" + key + "\" has already been defined as a data property."),
-            vm
-          );
+      var resolve = once(function (res) {
+        // cache resolved
+        factory.resolved = ensureCtor(res, baseCtor);
+        // invoke callbacks only if this is not a synchronous resolve
+        // (async resolves are shimmed as synchronous during SSR)
+        if (!sync) {
+          forceRender(true);
+        } else {
+          owners.length = 0;
         }
-      }
-      if (props && hasOwn(props, key)) {
+      });
+
+      var reject = once(function (reason) {
         warn(
-          "The data property \"" + key + "\" is already declared as a prop. " +
-          "Use prop default value instead.",
-          vm
+          "Failed to resolve async component: " + (String(factory)) +
+          (reason ? ("\nReason: " + reason) : '')
         );
-      } else if (!isReserved(key)) {
-        proxy(vm, "_data", key);
-      }
-    }
-    // observe data
-    observe(data, true /* asRootData */);
-  }
+        if (isDef(factory.errorComp)) {
+          factory.error = true;
+          forceRender(true);
+        }
+      });
+
+      var res = factory(resolve, reject);
+
+      if (isObject(res)) {
+        if (isPromise(res)) {
+          // () => Promise
+          if (isUndef(factory.resolved)) {
+            res.then(resolve, reject);
+          }
+        } else if (isPromise(res.component)) {
+          res.component.then(resolve, reject);
+
+          if (isDef(res.error)) {
+            factory.errorComp = ensureCtor(res.error, baseCtor);
+          }
+
+          if (isDef(res.loading)) {
+            factory.loadingComp = ensureCtor(res.loading, baseCtor);
+            if (res.delay === 0) {
+              factory.loading = true;
+            } else {
+              setTimeout(function () {
+                if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                  factory.loading = true;
+                  forceRender(false);
+                }
+              }, res.delay || 200);
+            }
+          }
+
+          if (isDef(res.timeout)) {
+            setTimeout(function () {
+              if (isUndef(factory.resolved)) {
+                reject(
+                  "timeout (" + (res.timeout) + "ms)"
+                );
+              }
+            }, res.timeout);
+          }
+        }
+      }
 
-  function getData (data, vm) {
-    // #7573 disable dep collection when invoking data getters
-    pushTarget();
-    try {
-      return data.call(vm, vm)
-    } catch (e) {
-      handleError(e, vm, "data()");
-      return {}
-    } finally {
-      popTarget();
+      sync = false;
+      // return in case resolved synchronously
+      return factory.loading
+        ? factory.loadingComp
+        : factory.resolved
     }
   }
 
-  var computedWatcherOptions = { lazy: true };
-
-  function initComputed (vm, computed) {
-    // $flow-disable-line
-    var watchers = vm._computedWatchers = Object.create(null);
-    // computed properties are just getters during SSR
-    var isSSR = isServerRendering();
+  /*  */
 
-    for (var key in computed) {
-      var userDef = computed[key];
-      var getter = typeof userDef === 'function' ? userDef : userDef.get;
-      if (getter == null) {
-        warn(
-          ("Getter is missing for computed property \"" + key + "\"."),
-          vm
-        );
-      }
+  function isAsyncPlaceholder (node) {
+    return node.isComment && node.asyncFactory
+  }
 
-      if (!isSSR) {
-        // create internal watcher for the computed property.
-        watchers[key] = new Watcher(
-          vm,
-          getter || noop,
-          noop,
-          computedWatcherOptions
-        );
-      }
+  /*  */
 
-      // component-defined computed properties are already defined on the
-      // component prototype. We only need to define computed properties defined
-      // at instantiation here.
-      if (!(key in vm)) {
-        defineComputed(vm, key, userDef);
-      } else {
-        if (key in vm.$data) {
-          warn(("The computed property \"" + key + "\" is already defined in data."), vm);
-        } else if (vm.$options.props && key in vm.$options.props) {
-          warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+  function getFirstComponentChild (children) {
+    if (Array.isArray(children)) {
+      for (var i = 0; i < children.length; i++) {
+        var c = children[i];
+        if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
+          return c
         }
       }
     }
   }
 
-  function defineComputed (
-    target,
-    key,
-    userDef
-  ) {
-    var shouldCache = !isServerRendering();
-    if (typeof userDef === 'function') {
-      sharedPropertyDefinition.get = shouldCache
-        ? createComputedGetter(key)
-        : createGetterInvoker(userDef);
-      sharedPropertyDefinition.set = noop;
-    } else {
-      sharedPropertyDefinition.get = userDef.get
-        ? shouldCache && userDef.cache !== false
-          ? createComputedGetter(key)
-          : createGetterInvoker(userDef.get)
-        : noop;
-      sharedPropertyDefinition.set = userDef.set || noop;
-    }
-    if (sharedPropertyDefinition.set === noop) {
-      sharedPropertyDefinition.set = function () {
-        warn(
-          ("Computed property \"" + key + "\" was assigned to but it has no setter."),
-          this
-        );
-      };
-    }
-    Object.defineProperty(target, key, sharedPropertyDefinition);
-  }
+  /*  */
 
-  function createComputedGetter (key) {
-    return function computedGetter () {
-      var watcher = this._computedWatchers && this._computedWatchers[key];
-      if (watcher) {
-        if (watcher.dirty) {
-          watcher.evaluate();
-        }
-        if (Dep.target) {
-          watcher.depend();
-        }
-        return watcher.value
-      }
+  /*  */
+
+  function initEvents (vm) {
+    vm._events = Object.create(null);
+    vm._hasHookEvent = false;
+    // init parent attached events
+    var listeners = vm.$options._parentListeners;
+    if (listeners) {
+      updateComponentListeners(vm, listeners);
     }
   }
 
-  function createGetterInvoker(fn) {
-    return function computedGetter () {
-      return fn.call(this, this)
-    }
+  var target;
+
+  function add (event, fn) {
+    target.$on(event, fn);
   }
 
-  function initMethods (vm, methods) {
-    var props = vm.$options.props;
-    for (var key in methods) {
-      {
-        if (typeof methods[key] !== 'function') {
-          warn(
-            "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
-            "Did you reference the function correctly?",
-            vm
-          );
-        }
-        if (props && hasOwn(props, key)) {
-          warn(
-            ("Method \"" + key + "\" has already been defined as a prop."),
-            vm
-          );
-        }
-        if ((key in vm) && isReserved(key)) {
-          warn(
-            "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
-            "Avoid defining component methods that start with _ or $."
-          );
-        }
-      }
-      vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
-    }
+  function remove$1 (event, fn) {
+    target.$off(event, fn);
   }
 
-  function initWatch (vm, watch) {
-    for (var key in watch) {
-      var handler = watch[key];
-      if (Array.isArray(handler)) {
-        for (var i = 0; i < handler.length; i++) {
-          createWatcher(vm, key, handler[i]);
-        }
-      } else {
-        createWatcher(vm, key, handler);
+  function createOnceHandler (event, fn) {
+    var _target = target;
+    return function onceHandler () {
+      var res = fn.apply(null, arguments);
+      if (res !== null) {
+        _target.$off(event, onceHandler);
       }
     }
   }
 
-  function createWatcher (
+  function updateComponentListeners (
     vm,
-    expOrFn,
-    handler,
-    options
+    listeners,
+    oldListeners
   ) {
-    if (isPlainObject(handler)) {
-      options = handler;
-      handler = handler.handler;
-    }
-    if (typeof handler === 'string') {
-      handler = vm[handler];
-    }
-    return vm.$watch(expOrFn, handler, options)
+    target = vm;
+    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+    target = undefined;
   }
 
-  function stateMixin (Vue) {
-    // flow somehow has problems with directly declared definition object
-    // when using Object.defineProperty, so we have to procedurally build up
-    // the object here.
-    var dataDef = {};
-    dataDef.get = function () { return this._data };
-    var propsDef = {};
-    propsDef.get = function () { return this._props };
-    {
-      dataDef.set = function () {
-        warn(
-          'Avoid replacing instance root $data. ' +
-          'Use nested data properties instead.',
-          this
-        );
-      };
-      propsDef.set = function () {
-        warn("$props is readonly.", this);
-      };
-    }
-    Object.defineProperty(Vue.prototype, '$data', dataDef);
-    Object.defineProperty(Vue.prototype, '$props', propsDef);
+  function eventsMixin (Vue) {
+    var hookRE = /^hook:/;
+    Vue.prototype.$on = function (event, fn) {
+      var vm = this;
+      if (Array.isArray(event)) {
+        for (var i = 0, l = event.length; i < l; i++) {
+          vm.$on(event[i], fn);
+        }
+      } else {
+        (vm._events[event] || (vm._events[event] = [])).push(fn);
+        // optimize hook:event cost by using a boolean flag marked at registration
+        // instead of a hash lookup
+        if (hookRE.test(event)) {
+          vm._hasHookEvent = true;
+        }
+      }
+      return vm
+    };
 
-    Vue.prototype.$set = set;
-    Vue.prototype.$delete = del;
+    Vue.prototype.$once = function (event, fn) {
+      var vm = this;
+      function on () {
+        vm.$off(event, on);
+        fn.apply(vm, arguments);
+      }
+      on.fn = fn;
+      vm.$on(event, on);
+      return vm
+    };
+
+    Vue.prototype.$off = function (event, fn) {
+      var vm = this;
+      // all
+      if (!arguments.length) {
+        vm._events = Object.create(null);
+        return vm
+      }
+      // array of events
+      if (Array.isArray(event)) {
+        for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
+          vm.$off(event[i$1], fn);
+        }
+        return vm
+      }
+      // specific event
+      var cbs = vm._events[event];
+      if (!cbs) {
+        return vm
+      }
+      if (!fn) {
+        vm._events[event] = null;
+        return vm
+      }
+      // specific handler
+      var cb;
+      var i = cbs.length;
+      while (i--) {
+        cb = cbs[i];
+        if (cb === fn || cb.fn === fn) {
+          cbs.splice(i, 1);
+          break
+        }
+      }
+      return vm
+    };
 
-    Vue.prototype.$watch = function (
-      expOrFn,
-      cb,
-      options
-    ) {
+    Vue.prototype.$emit = function (event) {
       var vm = this;
-      if (isPlainObject(cb)) {
-        return createWatcher(vm, expOrFn, cb, options)
-      }
-      options = options || {};
-      options.user = true;
-      var watcher = new Watcher(vm, expOrFn, cb, options);
-      if (options.immediate) {
-        try {
-          cb.call(vm, watcher.value);
-        } catch (error) {
-          handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
+      {
+        var lowerCaseEvent = event.toLowerCase();
+        if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
+          tip(
+            "Event \"" + lowerCaseEvent + "\" is emitted in component " +
+            (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
+            "Note that HTML attributes are case-insensitive and you cannot use " +
+            "v-on to listen to camelCase events when using in-DOM templates. " +
+            "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
+          );
         }
       }
-      return function unwatchFn () {
-        watcher.teardown();
+      var cbs = vm._events[event];
+      if (cbs) {
+        cbs = cbs.length > 1 ? toArray(cbs) : cbs;
+        var args = toArray(arguments, 1);
+        var info = "event handler for \"" + event + "\"";
+        for (var i = 0, l = cbs.length; i < l; i++) {
+          invokeWithErrorHandling(cbs[i], vm, args, vm, info);
+        }
       }
+      return vm
     };
   }
 
   /*  */
 
-  function initProvide (vm) {
-    var provide = vm.$options.provide;
-    if (provide) {
-      vm._provided = typeof provide === 'function'
-        ? provide.call(vm)
-        : provide;
-    }
-  }
+  var activeInstance = null;
+  var isUpdatingChildComponent = false;
 
-  function initInjections (vm) {
-    var result = resolveInject(vm.$options.inject, vm);
-    if (result) {
-      toggleObserving(false);
-      Object.keys(result).forEach(function (key) {
-        /* istanbul ignore else */
-        {
-          defineReactive$$1(vm, key, result[key], function () {
-            warn(
-              "Avoid mutating an injected value directly since the changes will be " +
-              "overwritten whenever the provided component re-renders. " +
-              "injection being mutated: \"" + key + "\"",
-              vm
-            );
-          });
-        }
-      });
-      toggleObserving(true);
+  function setActiveInstance(vm) {
+    var prevActiveInstance = activeInstance;
+    activeInstance = vm;
+    return function () {
+      activeInstance = prevActiveInstance;
     }
   }
 
-  function resolveInject (inject, vm) {
-    if (inject) {
-      // inject is :any because flow is not smart enough to figure out cached
-      var result = Object.create(null);
-      var keys = hasSymbol
-        ? Reflect.ownKeys(inject)
-        : Object.keys(inject);
+  function initLifecycle (vm) {
+    var options = vm.$options;
 
-      for (var i = 0; i < keys.length; i++) {
-        var key = keys[i];
-        // #6574 in case the inject object is observed...
-        if (key === '__ob__') { continue }
-        var provideKey = inject[key].from;
-        var source = vm;
-        while (source) {
-          if (source._provided && hasOwn(source._provided, provideKey)) {
-            result[key] = source._provided[provideKey];
-            break
-          }
-          source = source.$parent;
-        }
-        if (!source) {
-          if ('default' in inject[key]) {
-            var provideDefault = inject[key].default;
-            result[key] = typeof provideDefault === 'function'
-              ? provideDefault.call(vm)
-              : provideDefault;
-          } else {
-            warn(("Injection \"" + key + "\" not found"), vm);
-          }
-        }
+    // locate first non-abstract parent
+    var parent = options.parent;
+    if (parent && !options.abstract) {
+      while (parent.$options.abstract && parent.$parent) {
+        parent = parent.$parent;
       }
-      return result
+      parent.$children.push(vm);
     }
-  }
-
-  /*  */
 
-  function normalizeScopedSlots (
-    slots,
-    normalSlots
-  ) {
-    var res;
-    if (!slots) {
-      res = {};
-    } else if (slots._normalized) {
-      return slots
-    } else {
-      res = {};
-      for (var key in slots) {
-        if (slots[key] && key[0] !== '$') {
-          res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-        }
-      }
-    }
-    // expose normal slots on scopedSlots
-    for (var key$1 in normalSlots) {
-      if (!(key$1 in res)) {
-        res[key$1] = proxyNormalSlot(normalSlots, key$1);
-      }
-    }
-    res._normalized = true;
-    res.$stable = slots ? slots.$stable : true;
-    return res
-  }
+    vm.$parent = parent;
+    vm.$root = parent ? parent.$root : vm;
 
-  function normalizeScopedSlot(normalSlots, key, fn) {
-    var normalized = function (scope) {
-      if ( scope === void 0 ) scope = {};
+    vm.$children = [];
+    vm.$refs = {};
 
-      var res = fn(scope);
-      return res && typeof res === 'object' && !Array.isArray(res)
-        ? [res] // single vnode
-        : normalizeChildren(res)
-    };
-    // proxy scoped slots on normal $slots
-    if (!hasOwn(normalSlots, key)) {
-      Object.defineProperty(normalSlots, key, {
-        get: normalized
-      });
-    }
-    return normalized
+    vm._watcher = null;
+    vm._inactive = null;
+    vm._directInactive = false;
+    vm._isMounted = false;
+    vm._isDestroyed = false;
+    vm._isBeingDestroyed = false;
   }
 
-  function proxyNormalSlot(slots, key) {
-    return function () { return slots[key]; }
-  }
+  function lifecycleMixin (Vue) {
+    Vue.prototype._update = function (vnode, hydrating) {
+      var vm = this;
+      var prevEl = vm.$el;
+      var prevVnode = vm._vnode;
+      var restoreActiveInstance = setActiveInstance(vm);
+      vm._vnode = vnode;
+      // Vue.prototype.__patch__ is injected in entry points
+      // based on the rendering backend used.
+      if (!prevVnode) {
+        // initial render
+        vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
+      } else {
+        // updates
+        vm.$el = vm.__patch__(prevVnode, vnode);
+      }
+      restoreActiveInstance();
+      // update __vue__ reference
+      if (prevEl) {
+        prevEl.__vue__ = null;
+      }
+      if (vm.$el) {
+        vm.$el.__vue__ = vm;
+      }
+      // if parent is an HOC, update its $el as well
+      if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
+        vm.$parent.$el = vm.$el;
+      }
+      // updated hook is called by the scheduler to ensure that children are
+      // updated in a parent's updated hook.
+    };
 
-  /*  */
+    Vue.prototype.$forceUpdate = function () {
+      var vm = this;
+      if (vm._watcher) {
+        vm._watcher.update();
+      }
+    };
 
-  /**
-   * Runtime helper for rendering v-for lists.
-   */
-  function renderList (
-    val,
-    render
-  ) {
-    var ret, i, l, keys, key;
-    if (Array.isArray(val) || typeof val === 'string') {
-      ret = new Array(val.length);
-      for (i = 0, l = val.length; i < l; i++) {
-        ret[i] = render(val[i], i);
+    Vue.prototype.$destroy = function () {
+      var vm = this;
+      if (vm._isBeingDestroyed) {
+        return
       }
-    } else if (typeof val === 'number') {
-      ret = new Array(val);
-      for (i = 0; i < val; i++) {
-        ret[i] = render(i + 1, i);
+      callHook(vm, 'beforeDestroy');
+      vm._isBeingDestroyed = true;
+      // remove self from parent
+      var parent = vm.$parent;
+      if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
+        remove(parent.$children, vm);
+      }
+      // teardown watchers
+      if (vm._watcher) {
+        vm._watcher.teardown();
+      }
+      var i = vm._watchers.length;
+      while (i--) {
+        vm._watchers[i].teardown();
+      }
+      // remove reference from data ob
+      // frozen object may not have observer.
+      if (vm._data.__ob__) {
+        vm._data.__ob__.vmCount--;
+      }
+      // call the last hook...
+      vm._isDestroyed = true;
+      // invoke destroy hooks on current rendered tree
+      vm.__patch__(vm._vnode, null);
+      // fire destroyed hook
+      callHook(vm, 'destroyed');
+      // turn off all instance listeners.
+      vm.$off();
+      // remove __vue__ reference
+      if (vm.$el) {
+        vm.$el.__vue__ = null;
       }
-    } else if (isObject(val)) {
-      if (hasSymbol && val[Symbol.iterator]) {
-        ret = [];
-        var iterator = val[Symbol.iterator]();
-        var result = iterator.next();
-        while (!result.done) {
-          ret.push(render(result.value, ret.length));
-          result = iterator.next();
-        }
-      } else {
-        keys = Object.keys(val);
-        ret = new Array(keys.length);
-        for (i = 0, l = keys.length; i < l; i++) {
-          key = keys[i];
-          ret[i] = render(val[key], key, i);
-        }
+      // release circular reference (#6759)
+      if (vm.$vnode) {
+        vm.$vnode.parent = null;
       }
-    }
-    if (!isDef(ret)) {
-      ret = [];
-    }
-    (ret)._isVList = true;
-    return ret
+    };
   }
 
-  /*  */
-
-  /**
-   * Runtime helper for rendering <slot>
-   */
-  function renderSlot (
-    name,
-    fallback,
-    props,
-    bindObject
+  function mountComponent (
+    vm,
+    el,
+    hydrating
   ) {
-    var scopedSlotFn = this.$scopedSlots[name];
-    var nodes;
-    if (scopedSlotFn) { // scoped slot
-      props = props || {};
-      if (bindObject) {
-        if (!isObject(bindObject)) {
+    vm.$el = el;
+    if (!vm.$options.render) {
+      vm.$options.render = createEmptyVNode;
+      {
+        /* istanbul ignore if */
+        if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
+          vm.$options.el || el) {
           warn(
-            'slot v-bind without argument expects an Object',
-            this
+            'You are using the runtime-only build of Vue where the template ' +
+            'compiler is not available. Either pre-compile the templates into ' +
+            'render functions, or use the compiler-included build.',
+            vm
+          );
+        } else {
+          warn(
+            'Failed to mount component: template or render function not defined.',
+            vm
           );
         }
-        props = extend(extend({}, bindObject), props);
       }
-      nodes = scopedSlotFn(props) || fallback;
-    } else {
-      nodes = this.$slots[name] || fallback;
     }
+    callHook(vm, 'beforeMount');
 
-    var target = props && props.slot;
-    if (target) {
-      return this.$createElement('template', { slot: target }, nodes)
-    } else {
-      return nodes
-    }
-  }
+    var updateComponent;
+    /* istanbul ignore if */
+    if (config.performance && mark) {
+      updateComponent = function () {
+        var name = vm._name;
+        var id = vm._uid;
+        var startTag = "vue-perf-start:" + id;
+        var endTag = "vue-perf-end:" + id;
 
-  /*  */
+        mark(startTag);
+        var vnode = vm._render();
+        mark(endTag);
+        measure(("vue " + name + " render"), startTag, endTag);
 
-  /**
-   * Runtime helper for resolving filters
-   */
-  function resolveFilter (id) {
-    return resolveAsset(this.$options, 'filters', id, true) || identity
-  }
+        mark(startTag);
+        vm._update(vnode, hydrating);
+        mark(endTag);
+        measure(("vue " + name + " patch"), startTag, endTag);
+      };
+    } else {
+      updateComponent = function () {
+        vm._update(vm._render(), hydrating);
+      };
+    }
 
-  /*  */
+    // we set this to vm._watcher inside the watcher's constructor
+    // since the watcher's initial patch may call $forceUpdate (e.g. inside child
+    // component's mounted hook), which relies on vm._watcher being already defined
+    new Watcher(vm, updateComponent, noop, {
+      before: function before () {
+        if (vm._isMounted && !vm._isDestroyed) {
+          callHook(vm, 'beforeUpdate');
+        }
+      }
+    }, true /* isRenderWatcher */);
+    hydrating = false;
 
-  function isKeyNotMatch (expect, actual) {
-    if (Array.isArray(expect)) {
-      return expect.indexOf(actual) === -1
-    } else {
-      return expect !== actual
+    // manually mounted instance, call mounted on self
+    // mounted is called for render-created child components in its inserted hook
+    if (vm.$vnode == null) {
+      vm._isMounted = true;
+      callHook(vm, 'mounted');
     }
+    return vm
   }
 
-  /**
-   * Runtime helper for checking keyCodes from config.
-   * exposed as Vue.prototype._k
-   * passing in eventKeyName as last argument separately for backwards compat
-   */
-  function checkKeyCodes (
-    eventKeyCode,
-    key,
-    builtInKeyCode,
-    eventKeyName,
-    builtInKeyName
+  function updateChildComponent (
+    vm,
+    propsData,
+    listeners,
+    parentVnode,
+    renderChildren
   ) {
-    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-      return isKeyNotMatch(builtInKeyName, eventKeyName)
-    } else if (mappedKeyCode) {
-      return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-    } else if (eventKeyName) {
-      return hyphenate(eventKeyName) !== key
+    {
+      isUpdatingChildComponent = true;
     }
-  }
 
-  /*  */
+    // determine whether component has slot children
+    // we need to do this before overwriting $options._renderChildren.
 
-  /**
-   * Runtime helper for merging v-bind="object" into a VNode's data.
-   */
-  function bindObjectProps (
-    data,
-    tag,
-    value,
-    asProp,
-    isSync
-  ) {
-    if (value) {
-      if (!isObject(value)) {
-        warn(
-          'v-bind without argument expects an Object or Array value',
-          this
-        );
-      } else {
-        if (Array.isArray(value)) {
-          value = toObject(value);
-        }
-        var hash;
-        var loop = function ( key ) {
-          if (
-            key === 'class' ||
-            key === 'style' ||
-            isReservedAttribute(key)
-          ) {
-            hash = data;
-          } else {
-            var type = data.attrs && data.attrs.type;
-            hash = asProp || config.mustUseProp(tag, type, key)
-              ? data.domProps || (data.domProps = {})
-              : data.attrs || (data.attrs = {});
-          }
-          var camelizedKey = camelize(key);
-          if (!(key in hash) && !(camelizedKey in hash)) {
-            hash[key] = value[key];
+    // check if there are dynamic scopedSlots (hand-written or compiled but with
+    // dynamic slot names). Static scoped slots compiled from template has the
+    // "$stable" marker.
+    var hasDynamicScopedSlot = !!(
+      (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+      (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+    );
 
-            if (isSync) {
-              var on = data.on || (data.on = {});
-              on[("update:" + camelizedKey)] = function ($event) {
-                value[key] = $event;
-              };
-            }
-          }
-        };
+    // Any static slot children from the parent may have changed during parent's
+    // update. Dynamic scoped slots may also have changed. In such cases, a forced
+    // update is necessary to ensure correctness.
+    var needsForceUpdate = !!(
+      renderChildren ||               // has new static slots
+      vm.$options._renderChildren ||  // has old static slots
+      hasDynamicScopedSlot
+    );
+
+    vm.$options._parentVnode = parentVnode;
+    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+
+    if (vm._vnode) { // update child tree's parent
+      vm._vnode.parent = parentVnode;
+    }
+    vm.$options._renderChildren = renderChildren;
+
+    // update $attrs and $listeners hash
+    // these are also reactive so they may trigger child update if the child
+    // used them during render
+    vm.$attrs = parentVnode.data.attrs || emptyObject;
+    vm.$listeners = listeners || emptyObject;
+
+    // update props
+    if (propsData && vm.$options.props) {
+      toggleObserving(false);
+      var props = vm._props;
+      var propKeys = vm.$options._propKeys || [];
+      for (var i = 0; i < propKeys.length; i++) {
+        var key = propKeys[i];
+        var propOptions = vm.$options.props; // wtf flow?
+        props[key] = validateProp(key, propOptions, propsData, vm);
+      }
+      toggleObserving(true);
+      // keep a copy of raw propsData
+      vm.$options.propsData = propsData;
+    }
+
+    // update listeners
+    listeners = listeners || emptyObject;
+    var oldListeners = vm.$options._parentListeners;
+    vm.$options._parentListeners = listeners;
+    updateComponentListeners(vm, listeners, oldListeners);
 
-        for (var key in value) loop( key );
-      }
+    // resolve slots + force update if has children
+    if (needsForceUpdate) {
+      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+      vm.$forceUpdate();
     }
-    return data
-  }
-
-  /*  */
 
-  /**
-   * Runtime helper for rendering static trees.
-   */
-  function renderStatic (
-    index,
-    isInFor
-  ) {
-    var cached = this._staticTrees || (this._staticTrees = []);
-    var tree = cached[index];
-    // if has already-rendered static tree and not inside v-for,
-    // we can reuse the same tree.
-    if (tree && !isInFor) {
-      return tree
+    {
+      isUpdatingChildComponent = false;
     }
-    // otherwise, render a fresh tree.
-    tree = cached[index] = this.$options.staticRenderFns[index].call(
-      this._renderProxy,
-      null,
-      this // for render fns generated for functional component templates
-    );
-    markStatic(tree, ("__static__" + index), false);
-    return tree
   }
 
-  /**
-   * Runtime helper for v-once.
-   * Effectively it means marking the node as static with a unique key.
-   */
-  function markOnce (
-    tree,
-    index,
-    key
-  ) {
-    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-    return tree
+  function isInInactiveTree (vm) {
+    while (vm && (vm = vm.$parent)) {
+      if (vm._inactive) { return true }
+    }
+    return false
   }
 
-  function markStatic (
-    tree,
-    key,
-    isOnce
-  ) {
-    if (Array.isArray(tree)) {
-      for (var i = 0; i < tree.length; i++) {
-        if (tree[i] && typeof tree[i] !== 'string') {
-          markStaticNode(tree[i], (key + "_" + i), isOnce);
-        }
+  function activateChildComponent (vm, direct) {
+    if (direct) {
+      vm._directInactive = false;
+      if (isInInactiveTree(vm)) {
+        return
       }
-    } else {
-      markStaticNode(tree, key, isOnce);
+    } else if (vm._directInactive) {
+      return
     }
-  }
-
-  function markStaticNode (node, key, isOnce) {
-    node.isStatic = true;
-    node.key = key;
-    node.isOnce = isOnce;
-  }
-
-  /*  */
-
-  function bindObjectListeners (data, value) {
-    if (value) {
-      if (!isPlainObject(value)) {
-        warn(
-          'v-on without argument expects an Object value',
-          this
-        );
-      } else {
-        var on = data.on = data.on ? extend({}, data.on) : {};
-        for (var key in value) {
-          var existing = on[key];
-          var ours = value[key];
-          on[key] = existing ? [].concat(existing, ours) : ours;
-        }
+    if (vm._inactive || vm._inactive === null) {
+      vm._inactive = false;
+      for (var i = 0; i < vm.$children.length; i++) {
+        activateChildComponent(vm.$children[i]);
       }
+      callHook(vm, 'activated');
     }
-    return data
   }
 
-  /*  */
-
-  function bindDynamicKeys (baseObj, values) {
-    for (var i = 0; i < values.length; i += 2) {
-      var key = values[i];
-      if (typeof key === 'string' && key) {
-        baseObj[values[i]] = values[i + 1];
-      } else if (key !== '' && key !== null) {
-        // null is a speical value for explicitly removing a binding
-        warn(
-          ("Invalid value for dynamic directive argument (expected string or null): " + key),
-          this
-        );
+  function deactivateChildComponent (vm, direct) {
+    if (direct) {
+      vm._directInactive = true;
+      if (isInInactiveTree(vm)) {
+        return
       }
     }
-    return baseObj
+    if (!vm._inactive) {
+      vm._inactive = true;
+      for (var i = 0; i < vm.$children.length; i++) {
+        deactivateChildComponent(vm.$children[i]);
+      }
+      callHook(vm, 'deactivated');
+    }
   }
 
-  // helper to dynamically append modifier runtime markers to event names.
-  // ensure only append when value is already string, otherwise it will be cast
-  // to string and cause the type check to miss.
-  function prependModifier (value, symbol) {
-    return typeof value === 'string' ? symbol + value : value
+  function callHook (vm, hook) {
+    // #7573 disable dep collection when invoking lifecycle hooks
+    pushTarget();
+    var handlers = vm.$options[hook];
+    var info = hook + " hook";
+    if (handlers) {
+      for (var i = 0, j = handlers.length; i < j; i++) {
+        invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+      }
+    }
+    if (vm._hasHookEvent) {
+      vm.$emit('hook:' + hook);
+    }
+    popTarget();
   }
 
   /*  */
 
-  function installRenderHelpers (target) {
-    target._o = markOnce;
-    target._n = toNumber;
-    target._s = toString;
-    target._l = renderList;
-    target._t = renderSlot;
-    target._q = looseEqual;
-    target._i = looseIndexOf;
-    target._m = renderStatic;
-    target._f = resolveFilter;
-    target._k = checkKeyCodes;
-    target._b = bindObjectProps;
-    target._v = createTextVNode;
-    target._e = createEmptyVNode;
-    target._u = resolveScopedSlots;
-    target._g = bindObjectListeners;
-    target._d = bindDynamicKeys;
-    target._p = prependModifier;
-  }
+  var MAX_UPDATE_COUNT = 100;
 
-  /*  */
+  var queue = [];
+  var activatedChildren = [];
+  var has = {};
+  var circular = {};
+  var waiting = false;
+  var flushing = false;
+  var index = 0;
 
-  function FunctionalRenderContext (
-    data,
-    props,
-    children,
-    parent,
-    Ctor
-  ) {
-    var options = Ctor.options;
-    // ensure the createElement function in functional components
-    // gets a unique context - this is necessary for correct named slot check
-    var contextVm;
-    if (hasOwn(parent, '_uid')) {
-      contextVm = Object.create(parent);
-      // $flow-disable-line
-      contextVm._original = parent;
-    } else {
-      // the context vm passed in is a functional context as well.
-      // in this case we want to make sure we are able to get a hold to the
-      // real context instance.
-      contextVm = parent;
-      // $flow-disable-line
-      parent = parent._original;
+  /**
+   * Reset the scheduler's state.
+   */
+  function resetSchedulerState () {
+    index = queue.length = activatedChildren.length = 0;
+    has = {};
+    {
+      circular = {};
     }
-    var isCompiled = isTrue(options._compiled);
-    var needNormalization = !isCompiled;
-
-    this.data = data;
-    this.props = props;
-    this.children = children;
-    this.parent = parent;
-    this.listeners = data.on || emptyObject;
-    this.injections = resolveInject(options.inject, parent);
-    this.slots = function () { return resolveSlots(children, parent); };
+    waiting = flushing = false;
+  }
 
-    Object.defineProperty(this, 'scopedSlots', ({
-      enumerable: true,
-      get: function get () {
-        return normalizeScopedSlots(data.scopedSlots, this.slots())
-      }
-    }));
+  // Async edge case #6566 requires saving the timestamp when event listeners are
+  // attached. However, calling performance.now() has a perf overhead especially
+  // if the page has thousands of event listeners. Instead, we take a timestamp
+  // every time the scheduler flushes and use that for all event listeners
+  // attached during that flush.
+  var currentFlushTimestamp = 0;
 
-    // support for compiled functional template
-    if (isCompiled) {
-      // exposing $options for renderStatic()
-      this.$options = options;
-      // pre-resolve slots for renderSlot()
-      this.$slots = this.slots();
-      this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
-    }
+  // Async edge case fix requires storing an event listener's attach timestamp.
+  var getNow = Date.now;
 
-    if (options._scopeId) {
-      this._c = function (a, b, c, d) {
-        var vnode = createElement(contextVm, a, b, c, d, needNormalization);
-        if (vnode && !Array.isArray(vnode)) {
-          vnode.fnScopeId = options._scopeId;
-          vnode.fnContext = parent;
-        }
-        return vnode
-      };
-    } else {
-      this._c = function (a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
-    }
+  // Determine what event timestamp the browser is using. Annoyingly, the
+  // timestamp can either be hi-res (relative to page load) or low-res
+  // (relative to UNIX epoch), so in order to compare time we have to use the
+  // same timestamp type when saving the flush timestamp.
+  if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+    // if the low-res timestamp which is bigger than the event timestamp
+    // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+    // and we need to use the hi-res version for event listeners as well.
+    getNow = function () { return performance.now(); };
   }
 
-  installRenderHelpers(FunctionalRenderContext.prototype);
+  /**
+   * Flush both queues and run the watchers.
+   */
+  function flushSchedulerQueue () {
+    currentFlushTimestamp = getNow();
+    flushing = true;
+    var watcher, id;
 
-  function createFunctionalComponent (
-    Ctor,
-    propsData,
-    data,
-    contextVm,
-    children
-  ) {
-    var options = Ctor.options;
-    var props = {};
-    var propOptions = options.props;
-    if (isDef(propOptions)) {
-      for (var key in propOptions) {
-        props[key] = validateProp(key, propOptions, propsData || emptyObject);
+    // Sort queue before flush.
+    // This ensures that:
+    // 1. Components are updated from parent to child. (because parent is always
+    //    created before the child)
+    // 2. A component's user watchers are run before its render watcher (because
+    //    user watchers are created before the render watcher)
+    // 3. If a component is destroyed during a parent component's watcher run,
+    //    its watchers can be skipped.
+    queue.sort(function (a, b) { return a.id - b.id; });
+
+    // do not cache length because more watchers might be pushed
+    // as we run existing watchers
+    for (index = 0; index < queue.length; index++) {
+      watcher = queue[index];
+      if (watcher.before) {
+        watcher.before();
+      }
+      id = watcher.id;
+      has[id] = null;
+      watcher.run();
+      // in dev build, check and stop circular updates.
+      if (has[id] != null) {
+        circular[id] = (circular[id] || 0) + 1;
+        if (circular[id] > MAX_UPDATE_COUNT) {
+          warn(
+            'You may have an infinite update loop ' + (
+              watcher.user
+                ? ("in watcher with expression \"" + (watcher.expression) + "\"")
+                : "in a component render function."
+            ),
+            watcher.vm
+          );
+          break
+        }
       }
-    } else {
-      if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
-      if (isDef(data.props)) { mergeProps(props, data.props); }
     }
 
-    var renderContext = new FunctionalRenderContext(
-      data,
-      props,
-      children,
-      contextVm,
-      Ctor
-    );
+    // keep copies of post queues before resetting state
+    var activatedQueue = activatedChildren.slice();
+    var updatedQueue = queue.slice();
 
-    var vnode = options.render.call(null, renderContext._c, renderContext);
+    resetSchedulerState();
 
-    if (vnode instanceof VNode) {
-      return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
-    } else if (Array.isArray(vnode)) {
-      var vnodes = normalizeChildren(vnode) || [];
-      var res = new Array(vnodes.length);
-      for (var i = 0; i < vnodes.length; i++) {
-        res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
-      }
-      return res
+    // call component updated and activated hooks
+    callActivatedHooks(activatedQueue);
+    callUpdatedHooks(updatedQueue);
+
+    // devtool hook
+    /* istanbul ignore if */
+    if (devtools && config.devtools) {
+      devtools.emit('flush');
     }
   }
 
-  function cloneAndMarkFunctionalResult (vnode, data, contextVm, options, renderContext) {
-    // #7817 clone node before setting fnContext, otherwise if the node is reused
-    // (e.g. it was from a cached normal slot) the fnContext causes named slots
-    // that should not be matched to match.
-    var clone = cloneVNode(vnode);
-    clone.fnContext = contextVm;
-    clone.fnOptions = options;
-    {
-      (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
-    }
-    if (data.slot) {
-      (clone.data || (clone.data = {})).slot = data.slot;
+  function callUpdatedHooks (queue) {
+    var i = queue.length;
+    while (i--) {
+      var watcher = queue[i];
+      var vm = watcher.vm;
+      if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
+        callHook(vm, 'updated');
+      }
     }
-    return clone
   }
 
-  function mergeProps (to, from) {
-    for (var key in from) {
-      to[camelize(key)] = from[key];
-    }
+  /**
+   * Queue a kept-alive component that was activated during patch.
+   * The queue will be processed after the entire tree has been patched.
+   */
+  function queueActivatedComponent (vm) {
+    // setting _inactive to false here so that a render function can
+    // rely on checking whether it's in an inactive tree (e.g. router-view)
+    vm._inactive = false;
+    activatedChildren.push(vm);
   }
 
-  /*  */
+  function callActivatedHooks (queue) {
+    for (var i = 0; i < queue.length; i++) {
+      queue[i]._inactive = true;
+      activateChildComponent(queue[i], true /* true */);
+    }
+  }
 
-  /*  */
+  /**
+   * Push a watcher into the watcher queue.
+   * Jobs with duplicate IDs will be skipped unless it's
+   * pushed when the queue is being flushed.
+   */
+  function queueWatcher (watcher) {
+    var id = watcher.id;
+    if (has[id] == null) {
+      has[id] = true;
+      if (!flushing) {
+        queue.push(watcher);
+      } else {
+        // if already flushing, splice the watcher based on its id
+        // if already past its id, it will be run next immediately.
+        var i = queue.length - 1;
+        while (i > index && queue[i].id > watcher.id) {
+          i--;
+        }
+        queue.splice(i + 1, 0, watcher);
+      }
+      // queue the flush
+      if (!waiting) {
+        waiting = true;
 
-  /*  */
+        if (!config.async) {
+          flushSchedulerQueue();
+          return
+        }
+        nextTick(flushSchedulerQueue);
+      }
+    }
+  }
 
   /*  */
 
-  // inline hooks to be invoked on component VNodes during patch
-  var componentVNodeHooks = {
-    init: function init (vnode, hydrating) {
-      if (
-        vnode.componentInstance &&
-        !vnode.componentInstance._isDestroyed &&
-        vnode.data.keepAlive
-      ) {
-        // kept-alive components, treat as a patch
-        var mountedNode = vnode; // work around flow
-        componentVNodeHooks.prepatch(mountedNode, mountedNode);
-      } else {
-        var child = vnode.componentInstance = createComponentInstanceForVnode(
-          vnode,
-          activeInstance
-        );
-        child.$mount(hydrating ? vnode.elm : undefined, hydrating);
-      }
-    },
 
-    prepatch: function prepatch (oldVnode, vnode) {
-      var options = vnode.componentOptions;
-      var child = vnode.componentInstance = oldVnode.componentInstance;
-      updateChildComponent(
-        child,
-        options.propsData, // updated props
-        options.listeners, // updated listeners
-        vnode, // new parent vnode
-        options.children // new children
-      );
-    },
 
-    insert: function insert (vnode) {
-      var context = vnode.context;
-      var componentInstance = vnode.componentInstance;
-      if (!componentInstance._isMounted) {
-        componentInstance._isMounted = true;
-        callHook(componentInstance, 'mounted');
-      }
-      if (vnode.data.keepAlive) {
-        if (context._isMounted) {
-          // vue-router#1212
-          // During updates, a kept-alive component's child components may
-          // change, so directly walking the tree here may call activated hooks
-          // on incorrect children. Instead we push them into a queue which will
-          // be processed after the whole patch process ended.
-          queueActivatedComponent(componentInstance);
-        } else {
-          activateChildComponent(componentInstance, true /* direct */);
-        }
-      }
-    },
+  var uid$2 = 0;
 
-    destroy: function destroy (vnode) {
-      var componentInstance = vnode.componentInstance;
-      if (!componentInstance._isDestroyed) {
-        if (!vnode.data.keepAlive) {
-          componentInstance.$destroy();
-        } else {
-          deactivateChildComponent(componentInstance, true /* direct */);
-        }
+  /**
+   * A watcher parses an expression, collects dependencies,
+   * and fires callback when the expression value changes.
+   * This is used for both the $watch() api and directives.
+   */
+  var Watcher = function Watcher (
+    vm,
+    expOrFn,
+    cb,
+    options,
+    isRenderWatcher
+  ) {
+    this.vm = vm;
+    if (isRenderWatcher) {
+      vm._watcher = this;
+    }
+    vm._watchers.push(this);
+    // options
+    if (options) {
+      this.deep = !!options.deep;
+      this.user = !!options.user;
+      this.lazy = !!options.lazy;
+      this.sync = !!options.sync;
+      this.before = options.before;
+    } else {
+      this.deep = this.user = this.lazy = this.sync = false;
+    }
+    this.cb = cb;
+    this.id = ++uid$2; // uid for batching
+    this.active = true;
+    this.dirty = this.lazy; // for lazy watchers
+    this.deps = [];
+    this.newDeps = [];
+    this.depIds = new _Set();
+    this.newDepIds = new _Set();
+    this.expression = expOrFn.toString();
+    // parse expression for getter
+    if (typeof expOrFn === 'function') {
+      this.getter = expOrFn;
+    } else {
+      this.getter = parsePath(expOrFn);
+      if (!this.getter) {
+        this.getter = noop;
+        warn(
+          "Failed watching path: \"" + expOrFn + "\" " +
+          'Watcher only accepts simple dot-delimited paths. ' +
+          'For full control, use a function instead.',
+          vm
+        );
       }
     }
+    this.value = this.lazy
+      ? undefined
+      : this.get();
   };
 
-  var hooksToMerge = Object.keys(componentVNodeHooks);
-
-  function createComponent (
-    Ctor,
-    data,
-    context,
-    children,
-    tag
-  ) {
-    if (isUndef(Ctor)) {
-      return
-    }
-
-    var baseCtor = context.$options._base;
-
-    // plain options object: turn it into a constructor
-    if (isObject(Ctor)) {
-      Ctor = baseCtor.extend(Ctor);
-    }
-
-    // if at this stage it's not a constructor or an async component factory,
-    // reject.
-    if (typeof Ctor !== 'function') {
-      {
-        warn(("Invalid Component definition: " + (String(Ctor))), context);
+  /**
+   * Evaluate the getter, and re-collect dependencies.
+   */
+  Watcher.prototype.get = function get () {
+    pushTarget(this);
+    var value;
+    var vm = this.vm;
+    try {
+      value = this.getter.call(vm, vm);
+    } catch (e) {
+      if (this.user) {
+        handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
+      } else {
+        throw e
       }
-      return
+    } finally {
+      // "touch" every property so they are all tracked as
+      // dependencies for deep watching
+      if (this.deep) {
+        traverse(value);
+      }
+      popTarget();
+      this.cleanupDeps();
     }
+    return value
+  };
 
-    // async component
-    var asyncFactory;
-    if (isUndef(Ctor.cid)) {
-      asyncFactory = Ctor;
-      Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
-      if (Ctor === undefined) {
-        // return a placeholder node for async component, which is rendered
-        // as a comment node but preserves all the raw information for the node.
-        // the information will be used for async server-rendering and hydration.
-        return createAsyncPlaceholder(
-          asyncFactory,
-          data,
-          context,
-          children,
-          tag
-        )
+  /**
+   * Add a dependency to this directive.
+   */
+  Watcher.prototype.addDep = function addDep (dep) {
+    var id = dep.id;
+    if (!this.newDepIds.has(id)) {
+      this.newDepIds.add(id);
+      this.newDeps.push(dep);
+      if (!this.depIds.has(id)) {
+        dep.addSub(this);
       }
     }
+  };
 
-    data = data || {};
-
-    // resolve constructor options in case global mixins are applied after
-    // component constructor creation
-    resolveConstructorOptions(Ctor);
-
-    // transform component v-model data into props & events
-    if (isDef(data.model)) {
-      transformModel(Ctor.options, data);
+  /**
+   * Clean up for dependency collection.
+   */
+  Watcher.prototype.cleanupDeps = function cleanupDeps () {
+    var i = this.deps.length;
+    while (i--) {
+      var dep = this.deps[i];
+      if (!this.newDepIds.has(dep.id)) {
+        dep.removeSub(this);
+      }
     }
+    var tmp = this.depIds;
+    this.depIds = this.newDepIds;
+    this.newDepIds = tmp;
+    this.newDepIds.clear();
+    tmp = this.deps;
+    this.deps = this.newDeps;
+    this.newDeps = tmp;
+    this.newDeps.length = 0;
+  };
 
-    // extract props
-    var propsData = extractPropsFromVNodeData(data, Ctor, tag);
-
-    // functional component
-    if (isTrue(Ctor.options.functional)) {
-      return createFunctionalComponent(Ctor, propsData, data, context, children)
+  /**
+   * Subscriber interface.
+   * Will be called when a dependency changes.
+   */
+  Watcher.prototype.update = function update () {
+    /* istanbul ignore else */
+    if (this.lazy) {
+      this.dirty = true;
+    } else if (this.sync) {
+      this.run();
+    } else {
+      queueWatcher(this);
     }
+  };
 
-    // extract listeners, since these needs to be treated as
-    // child component listeners instead of DOM listeners
-    var listeners = data.on;
-    // replace with listeners with .native modifier
-    // so it gets processed during parent component patch.
-    data.on = data.nativeOn;
-
-    if (isTrue(Ctor.options.abstract)) {
-      // abstract components do not keep anything
-      // other than props & listeners & slot
-
-      // work around flow
-      var slot = data.slot;
-      data = {};
-      if (slot) {
-        data.slot = slot;
+  /**
+   * Scheduler job interface.
+   * Will be called by the scheduler.
+   */
+  Watcher.prototype.run = function run () {
+    if (this.active) {
+      var value = this.get();
+      if (
+        value !== this.value ||
+        // Deep watchers and watchers on Object/Arrays should fire even
+        // when the value is the same, because the value may
+        // have mutated.
+        isObject(value) ||
+        this.deep
+      ) {
+        // set new value
+        var oldValue = this.value;
+        this.value = value;
+        if (this.user) {
+          try {
+            this.cb.call(this.vm, value, oldValue);
+          } catch (e) {
+            handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
+          }
+        } else {
+          this.cb.call(this.vm, value, oldValue);
+        }
       }
     }
+  };
 
-    // install component management hooks onto the placeholder node
-    installComponentHooks(data);
-
-    // return a placeholder vnode
-    var name = Ctor.options.name || tag;
-    var vnode = new VNode(
-      ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
-      data, undefined, undefined, undefined, context,
-      { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
-      asyncFactory
-    );
-
-    return vnode
-  }
+  /**
+   * Evaluate the value of the watcher.
+   * This only gets called for lazy watchers.
+   */
+  Watcher.prototype.evaluate = function evaluate () {
+    this.value = this.get();
+    this.dirty = false;
+  };
 
-  function createComponentInstanceForVnode (
-    vnode, // we know it's MountedComponentVNode but flow doesn't
-    parent // activeInstance in lifecycle state
-  ) {
-    var options = {
-      _isComponent: true,
-      _parentVnode: vnode,
-      parent: parent
-    };
-    // check inline-template render functions
-    var inlineTemplate = vnode.data.inlineTemplate;
-    if (isDef(inlineTemplate)) {
-      options.render = inlineTemplate.render;
-      options.staticRenderFns = inlineTemplate.staticRenderFns;
+  /**
+   * Depend on all deps collected by this watcher.
+   */
+  Watcher.prototype.depend = function depend () {
+    var i = this.deps.length;
+    while (i--) {
+      this.deps[i].depend();
     }
-    return new vnode.componentOptions.Ctor(options)
-  }
+  };
 
-  function installComponentHooks (data) {
-    var hooks = data.hook || (data.hook = {});
-    for (var i = 0; i < hooksToMerge.length; i++) {
-      var key = hooksToMerge[i];
-      var existing = hooks[key];
-      var toMerge = componentVNodeHooks[key];
-      if (existing !== toMerge && !(existing && existing._merged)) {
-        hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
+  /**
+   * Remove self from all dependencies' subscriber list.
+   */
+  Watcher.prototype.teardown = function teardown () {
+    if (this.active) {
+      // remove self from vm's watcher list
+      // this is a somewhat expensive operation so we skip it
+      // if the vm is being destroyed.
+      if (!this.vm._isBeingDestroyed) {
+        remove(this.vm._watchers, this);
+      }
+      var i = this.deps.length;
+      while (i--) {
+        this.deps[i].removeSub(this);
       }
+      this.active = false;
     }
-  }
+  };
+
+  /*  */
 
-  function mergeHook$1 (f1, f2) {
-    var merged = function (a, b) {
-      // flow complains about extra args which is why we use any
-      f1(a, b);
-      f2(a, b);
+  var sharedPropertyDefinition = {
+    enumerable: true,
+    configurable: true,
+    get: noop,
+    set: noop
+  };
+
+  function proxy (target, sourceKey, key) {
+    sharedPropertyDefinition.get = function proxyGetter () {
+      return this[sourceKey][key]
     };
-    merged._merged = true;
-    return merged
+    sharedPropertyDefinition.set = function proxySetter (val) {
+      this[sourceKey][key] = val;
+    };
+    Object.defineProperty(target, key, sharedPropertyDefinition);
   }
 
-  // transform component v-model info (value and callback) into
-  // prop and event handler respectively.
-  function transformModel (options, data) {
-    var prop = (options.model && options.model.prop) || 'value';
-    var event = (options.model && options.model.event) || 'input'
-    ;(data.attrs || (data.attrs = {}))[prop] = data.model.value;
-    var on = data.on || (data.on = {});
-    var existing = on[event];
-    var callback = data.model.callback;
-    if (isDef(existing)) {
-      if (
-        Array.isArray(existing)
-          ? existing.indexOf(callback) === -1
-          : existing !== callback
-      ) {
-        on[event] = [callback].concat(existing);
-      }
+  function initState (vm) {
+    vm._watchers = [];
+    var opts = vm.$options;
+    if (opts.props) { initProps(vm, opts.props); }
+    if (opts.methods) { initMethods(vm, opts.methods); }
+    if (opts.data) {
+      initData(vm);
     } else {
-      on[event] = callback;
+      observe(vm._data = {}, true /* asRootData */);
+    }
+    if (opts.computed) { initComputed(vm, opts.computed); }
+    if (opts.watch && opts.watch !== nativeWatch) {
+      initWatch(vm, opts.watch);
     }
   }
 
-  /*  */
-
-  var SIMPLE_NORMALIZE = 1;
-  var ALWAYS_NORMALIZE = 2;
-
-  // wrapper function for providing a more flexible interface
-  // without getting yelled at by flow
-  function createElement (
-    context,
-    tag,
-    data,
-    children,
-    normalizationType,
-    alwaysNormalize
-  ) {
-    if (Array.isArray(data) || isPrimitive(data)) {
-      normalizationType = children;
-      children = data;
-      data = undefined;
-    }
-    if (isTrue(alwaysNormalize)) {
-      normalizationType = ALWAYS_NORMALIZE;
+  function initProps (vm, propsOptions) {
+    var propsData = vm.$options.propsData || {};
+    var props = vm._props = {};
+    // cache prop keys so that future props updates can iterate using Array
+    // instead of dynamic object key enumeration.
+    var keys = vm.$options._propKeys = [];
+    var isRoot = !vm.$parent;
+    // root instance props should be converted
+    if (!isRoot) {
+      toggleObserving(false);
     }
-    return _createElement(context, tag, data, children, normalizationType)
+    var loop = function ( key ) {
+      keys.push(key);
+      var value = validateProp(key, propsOptions, propsData, vm);
+      /* istanbul ignore else */
+      {
+        var hyphenatedKey = hyphenate(key);
+        if (isReservedAttribute(hyphenatedKey) ||
+            config.isReservedAttr(hyphenatedKey)) {
+          warn(
+            ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
+            vm
+          );
+        }
+        defineReactive$$1(props, key, value, function () {
+          if (!isRoot && !isUpdatingChildComponent) {
+            warn(
+              "Avoid mutating a prop directly since the value will be " +
+              "overwritten whenever the parent component re-renders. " +
+              "Instead, use a data or computed property based on the prop's " +
+              "value. Prop being mutated: \"" + key + "\"",
+              vm
+            );
+          }
+        });
+      }
+      // static props are already proxied on the component's prototype
+      // during Vue.extend(). We only need to proxy props defined at
+      // instantiation here.
+      if (!(key in vm)) {
+        proxy(vm, "_props", key);
+      }
+    };
+
+    for (var key in propsOptions) loop( key );
+    toggleObserving(true);
   }
 
-  function _createElement (
-    context,
-    tag,
-    data,
-    children,
-    normalizationType
-  ) {
-    if (isDef(data) && isDef((data).__ob__)) {
+  function initData (vm) {
+    var data = vm.$options.data;
+    data = vm._data = typeof data === 'function'
+      ? getData(data, vm)
+      : data || {};
+    if (!isPlainObject(data)) {
+      data = {};
       warn(
-        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-        'Always create fresh vnode data objects in each render!',
-        context
+        'data functions should return an object:\n' +
+        'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
+        vm
       );
-      return createEmptyVNode()
-    }
-    // object syntax in v-bind
-    if (isDef(data) && isDef(data.is)) {
-      tag = data.is;
-    }
-    if (!tag) {
-      // in case of component :is set to falsy value
-      return createEmptyVNode()
     }
-    // warn against non-primitive key
-    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-    ) {
+    // proxy data on instance
+    var keys = Object.keys(data);
+    var props = vm.$options.props;
+    var methods = vm.$options.methods;
+    var i = keys.length;
+    while (i--) {
+      var key = keys[i];
       {
+        if (methods && hasOwn(methods, key)) {
+          warn(
+            ("Method \"" + key + "\" has already been defined as a data property."),
+            vm
+          );
+        }
+      }
+      if (props && hasOwn(props, key)) {
         warn(
-          'Avoid using non-primitive value as key, ' +
-          'use string/number value instead.',
-          context
+          "The data property \"" + key + "\" is already declared as a prop. " +
+          "Use prop default value instead.",
+          vm
         );
+      } else if (!isReserved(key)) {
+        proxy(vm, "_data", key);
       }
     }
-    // support single function children as default scoped slot
-    if (Array.isArray(children) &&
-      typeof children[0] === 'function'
-    ) {
-      data = data || {};
-      data.scopedSlots = { default: children[0] };
-      children.length = 0;
-    }
-    if (normalizationType === ALWAYS_NORMALIZE) {
-      children = normalizeChildren(children);
-    } else if (normalizationType === SIMPLE_NORMALIZE) {
-      children = simpleNormalizeChildren(children);
+    // observe data
+    observe(data, true /* asRootData */);
+  }
+
+  function getData (data, vm) {
+    // #7573 disable dep collection when invoking data getters
+    pushTarget();
+    try {
+      return data.call(vm, vm)
+    } catch (e) {
+      handleError(e, vm, "data()");
+      return {}
+    } finally {
+      popTarget();
     }
-    var vnode, ns;
-    if (typeof tag === 'string') {
-      var Ctor;
-      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-      if (config.isReservedTag(tag)) {
-        // platform built-in elements
-        vnode = new VNode(
-          config.parsePlatformTagName(tag), data, children,
-          undefined, undefined, context
+  }
+
+  var computedWatcherOptions = { lazy: true };
+
+  function initComputed (vm, computed) {
+    // $flow-disable-line
+    var watchers = vm._computedWatchers = Object.create(null);
+    // computed properties are just getters during SSR
+    var isSSR = isServerRendering();
+
+    for (var key in computed) {
+      var userDef = computed[key];
+      var getter = typeof userDef === 'function' ? userDef : userDef.get;
+      if (getter == null) {
+        warn(
+          ("Getter is missing for computed property \"" + key + "\"."),
+          vm
         );
-      } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-        // component
-        vnode = createComponent(Ctor, data, context, children, tag);
-      } else {
-        // unknown or unlisted namespaced elements
-        // check at runtime because it may get assigned a namespace when its
-        // parent normalizes children
-        vnode = new VNode(
-          tag, data, children,
-          undefined, undefined, context
+      }
+
+      if (!isSSR) {
+        // create internal watcher for the computed property.
+        watchers[key] = new Watcher(
+          vm,
+          getter || noop,
+          noop,
+          computedWatcherOptions
         );
       }
-    } else {
-      // direct component options / constructor
-      vnode = createComponent(tag, data, context, children);
+
+      // component-defined computed properties are already defined on the
+      // component prototype. We only need to define computed properties defined
+      // at instantiation here.
+      if (!(key in vm)) {
+        defineComputed(vm, key, userDef);
+      } else {
+        if (key in vm.$data) {
+          warn(("The computed property \"" + key + "\" is already defined in data."), vm);
+        } else if (vm.$options.props && key in vm.$options.props) {
+          warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
+        }
+      }
     }
-    if (Array.isArray(vnode)) {
-      return vnode
-    } else if (isDef(vnode)) {
-      if (isDef(ns)) { applyNS(vnode, ns); }
-      if (isDef(data)) { registerDeepBindings(data); }
-      return vnode
+  }
+
+  function defineComputed (
+    target,
+    key,
+    userDef
+  ) {
+    var shouldCache = !isServerRendering();
+    if (typeof userDef === 'function') {
+      sharedPropertyDefinition.get = shouldCache
+        ? createComputedGetter(key)
+        : createGetterInvoker(userDef);
+      sharedPropertyDefinition.set = noop;
     } else {
-      return createEmptyVNode()
+      sharedPropertyDefinition.get = userDef.get
+        ? shouldCache && userDef.cache !== false
+          ? createComputedGetter(key)
+          : createGetterInvoker(userDef.get)
+        : noop;
+      sharedPropertyDefinition.set = userDef.set || noop;
     }
+    if (sharedPropertyDefinition.set === noop) {
+      sharedPropertyDefinition.set = function () {
+        warn(
+          ("Computed property \"" + key + "\" was assigned to but it has no setter."),
+          this
+        );
+      };
+    }
+    Object.defineProperty(target, key, sharedPropertyDefinition);
   }
 
-  function applyNS (vnode, ns, force) {
-    vnode.ns = ns;
-    if (vnode.tag === 'foreignObject') {
-      // use default namespace inside foreignObject
-      ns = undefined;
-      force = true;
-    }
-    if (isDef(vnode.children)) {
-      for (var i = 0, l = vnode.children.length; i < l; i++) {
-        var child = vnode.children[i];
-        if (isDef(child.tag) && (
-          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-          applyNS(child, ns, force);
+  function createComputedGetter (key) {
+    return function computedGetter () {
+      var watcher = this._computedWatchers && this._computedWatchers[key];
+      if (watcher) {
+        if (watcher.dirty) {
+          watcher.evaluate();
         }
+        if (Dep.target) {
+          watcher.depend();
+        }
+        return watcher.value
       }
     }
   }
 
-  // ref #5318
-  // necessary to ensure parent re-render when deep bindings like :style and
-  // :class are used on slot nodes
-  function registerDeepBindings (data) {
-    if (isObject(data.style)) {
-      traverse(data.style);
-    }
-    if (isObject(data.class)) {
-      traverse(data.class);
+  function createGetterInvoker(fn) {
+    return function computedGetter () {
+      return fn.call(this, this)
     }
   }
 
-  /*  */
-
-  function initRender (vm) {
-    vm._vnode = null; // the root of the child tree
-    vm._staticTrees = null; // v-once cached trees
-    var options = vm.$options;
-    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
-    var renderContext = parentVnode && parentVnode.context;
-    vm.$slots = resolveSlots(options._renderChildren, renderContext);
-    vm.$scopedSlots = emptyObject;
-    // bind the createElement fn to this instance
-    // so that we get proper render context inside it.
-    // args order: tag, data, children, normalizationType, alwaysNormalize
-    // internal version is used by render functions compiled from templates
-    vm._c = function (a, b, c, d) { return createElement(vm, a, b, c, d, false); };
-    // normalization is always applied for the public version, used in
-    // user-written render functions.
-    vm.$createElement = function (a, b, c, d) { return createElement(vm, a, b, c, d, true); };
+  function initMethods (vm, methods) {
+    var props = vm.$options.props;
+    for (var key in methods) {
+      {
+        if (typeof methods[key] !== 'function') {
+          warn(
+            "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
+            "Did you reference the function correctly?",
+            vm
+          );
+        }
+        if (props && hasOwn(props, key)) {
+          warn(
+            ("Method \"" + key + "\" has already been defined as a prop."),
+            vm
+          );
+        }
+        if ((key in vm) && isReserved(key)) {
+          warn(
+            "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
+            "Avoid defining component methods that start with _ or $."
+          );
+        }
+      }
+      vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
+    }
+  }
 
-    // $attrs & $listeners are exposed for easier HOC creation.
-    // they need to be reactive so that HOCs using them are always updated
-    var parentData = parentVnode && parentVnode.data;
+  function initWatch (vm, watch) {
+    for (var key in watch) {
+      var handler = watch[key];
+      if (Array.isArray(handler)) {
+        for (var i = 0; i < handler.length; i++) {
+          createWatcher(vm, key, handler[i]);
+        }
+      } else {
+        createWatcher(vm, key, handler);
+      }
+    }
+  }
 
-    /* istanbul ignore else */
-    {
-      defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
-        !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
-      }, true);
-      defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
-        !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
-      }, true);
+  function createWatcher (
+    vm,
+    expOrFn,
+    handler,
+    options
+  ) {
+    if (isPlainObject(handler)) {
+      options = handler;
+      handler = handler.handler;
+    }
+    if (typeof handler === 'string') {
+      handler = vm[handler];
     }
+    return vm.$watch(expOrFn, handler, options)
   }
 
-  function renderMixin (Vue) {
-    // install runtime convenience helpers
-    installRenderHelpers(Vue.prototype);
+  function stateMixin (Vue) {
+    // flow somehow has problems with directly declared definition object
+    // when using Object.defineProperty, so we have to procedurally build up
+    // the object here.
+    var dataDef = {};
+    dataDef.get = function () { return this._data };
+    var propsDef = {};
+    propsDef.get = function () { return this._props };
+    {
+      dataDef.set = function () {
+        warn(
+          'Avoid replacing instance root $data. ' +
+          'Use nested data properties instead.',
+          this
+        );
+      };
+      propsDef.set = function () {
+        warn("$props is readonly.", this);
+      };
+    }
+    Object.defineProperty(Vue.prototype, '$data', dataDef);
+    Object.defineProperty(Vue.prototype, '$props', propsDef);
 
-    Vue.prototype.$nextTick = function (fn) {
-      return nextTick(fn, this)
-    };
+    Vue.prototype.$set = set;
+    Vue.prototype.$delete = del;
 
-    Vue.prototype._render = function () {
+    Vue.prototype.$watch = function (
+      expOrFn,
+      cb,
+      options
+    ) {
       var vm = this;
-      var ref = vm.$options;
-      var render = ref.render;
-      var _parentVnode = ref._parentVnode;
-
-      if (_parentVnode) {
-        vm.$scopedSlots = normalizeScopedSlots(
-          _parentVnode.data.scopedSlots,
-          vm.$slots
-        );
+      if (isPlainObject(cb)) {
+        return createWatcher(vm, expOrFn, cb, options)
       }
-
-      // set parent vnode. this allows render functions to have access
-      // to the data on the placeholder node.
-      vm.$vnode = _parentVnode;
-      // render self
-      var vnode;
-      try {
-        vnode = render.call(vm._renderProxy, vm.$createElement);
-      } catch (e) {
-        handleError(e, vm, "render");
-        // return error render result,
-        // or previous vnode to prevent render error causing blank component
-        /* istanbul ignore else */
-        if (vm.$options.renderError) {
-          try {
-            vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
-          } catch (e) {
-            handleError(e, vm, "renderError");
-            vnode = vm._vnode;
-          }
-        } else {
-          vnode = vm._vnode;
+      options = options || {};
+      options.user = true;
+      var watcher = new Watcher(vm, expOrFn, cb, options);
+      if (options.immediate) {
+        try {
+          cb.call(vm, watcher.value);
+        } catch (error) {
+          handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
         }
       }
-      // if the returned array contains only a single node, allow it
-      if (Array.isArray(vnode) && vnode.length === 1) {
-        vnode = vnode[0];
-      }
-      // return empty vnode in case the render function errored out
-      if (!(vnode instanceof VNode)) {
-        if (Array.isArray(vnode)) {
-          warn(
-            'Multiple root nodes returned from render function. Render function ' +
-            'should return a single root node.',
-            vm
-          );
-        }
-        vnode = createEmptyVNode();
+      return function unwatchFn () {
+        watcher.teardown();
       }
-      // set parent
-      vnode.parent = _parentVnode;
-      return vnode
     };
   }
 
@@ -5323,7 +5326,7 @@
     value: FunctionalRenderContext
   });
 
-  Vue.version = '2.6.2';
+  Vue.version = '2.6.3';
 
   /*  */
 
@@ -6748,6 +6751,11 @@
     }
   }
 
+  // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect Event.timeStamp
+  // implementation and does not fire microtasks in between event propagation, so
+  // safe to exclude.
+  var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);
+
   function add$1 (
     name,
     handler,
@@ -6760,11 +6768,16 @@
     // the solution is simple: we save the timestamp when a handler is attached,
     // and the handler would only fire if the event passed to it was fired
     // AFTER it was attached.
-    if (isUsingMicroTask) {
+    if (useMicrotaskFix) {
       var attachedTimestamp = currentFlushTimestamp;
       var original = handler;
       handler = original._wrapper = function (e) {
-        if (e.timeStamp >= attachedTimestamp) {
+        if (
+          e.timeStamp >= attachedTimestamp ||
+          // #9448 bail if event is fired in another document in a multi-page
+          // electron/nw.js app
+          e.target.ownerDocument !== document
+        ) {
           return original.apply(this, arguments)
         }
       };
diff --git a/dist/vue.runtime.min.js b/dist/vue.runtime.min.js
index 9f3ae156f1c..01dc65ae4fc 100644
--- a/dist/vue.runtime.min.js
+++ b/dist/vue.runtime.min.js
@@ -1,6 +1,6 @@
 /*!
- * Vue.js v2.6.2
+ * Vue.js v2.6.3
  * (c) 2014-2019 Evan You
  * Released under the MIT License.
  */
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t=t||self).Vue=e()}(this,function(){"use strict";var t=Object.freeze({});function e(t){return null==t}function n(t){return null!=t}function r(t){return!0===t}function o(t){return"string"==typeof t||"number"==typeof t||"symbol"==typeof t||"boolean"==typeof t}function i(t){return null!==t&&"object"==typeof t}var a=Object.prototype.toString;function s(t){return"[object Object]"===a.call(t)}function c(t){var e=parseFloat(String(t));return e>=0&&Math.floor(e)===e&&isFinite(t)}function u(t){return n(t)&&"function"==typeof t.then&&"function"==typeof t.catch}function l(t){return null==t?"":Array.isArray(t)||s(t)&&t.toString===a?JSON.stringify(t,null,2):String(t)}function f(t){var e=parseFloat(t);return isNaN(e)?t:e}function p(t,e){for(var n=Object.create(null),r=t.split(","),o=0;o<r.length;o++)n[r[o]]=!0;return e?function(t){return 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s,c,l,p=0,d=0,v=r.length-1,h=r[0],m=r[v],y=o.length-1,g=o[0],b=o[y],w=!a;p<=v&&d<=y;)e(h)?h=r[++p]:e(m)?m=r[--v]:Qn(h,g)?($(h,g,i,o,d),h=r[++p],g=o[++d]):Qn(m,b)?($(m,b,i,o,y),m=r[--v],b=o[--y]):Qn(h,b)?($(h,b,i,o,y),w&&u.insertBefore(t,h.elm,u.nextSibling(m.elm)),h=r[++p],b=o[--y]):Qn(m,g)?($(m,g,i,o,d),w&&u.insertBefore(t,m.elm,h.elm),m=r[--v],g=o[++d]):(e(s)&&(s=Yn(r,p,v)),e(c=n(g.key)?s[g.key]:A(g,r,p,v))?f(g,i,t,h.elm,!1,o,d):Qn(l=r[c],g)?($(l,g,i,o,d),r[c]=void 0,w&&u.insertBefore(t,l.elm,h.elm)):f(g,i,t,h.elm,!1,o,d),g=o[++d]);p>v?_(t,e(o[y+1])?null:o[y+1].elm,o,d,y,i):d>y&&C(0,r,p,v)}(p,h,y,i,l):n(y)?(n(t.text)&&u.setTextContent(p,""),_(p,null,y,0,y.length-1,i)):n(h)?C(0,h,0,h.length-1):n(t.text)&&u.setTextContent(p,""):t.text!==o.text&&u.setTextContent(p,o.text),n(v)&&n(d=v.hook)&&n(d=d.postpatch)&&d(t,o)}}}function x(t,e,o){if(r(o)&&n(t.parent))t.parent.data.pendingInsert=e;else for(var i=0;i<e.length;++i)e[i].data.hook.insert(e[i])}var O=p("attrs,class,staticClass,staticStyle,key");function k(t,e,o,i){var a,s=e.tag,c=e.data,u=e.children;if(i=i||c&&c.pre,e.elm=t,r(e.isComment)&&n(e.asyncFactory))return e.isAsyncPlaceholder=!0,!0;if(n(c)&&(n(a=c.hook)&&n(a=a.init)&&a(e,!0),n(a=e.componentInstance)))return d(e,o),!0;if(n(s)){if(n(u))if(t.hasChildNodes())if(n(a=c)&&n(a=a.domProps)&&n(a=a.innerHTML)){if(a!==t.innerHTML)return!1}else{for(var l=!0,f=t.firstChild,p=0;p<u.length;p++){if(!f||!k(f,u[p],o,i)){l=!1;break}f=f.nextSibling}if(!l||f)return!1}else h(e,u,o);if(n(c)){var v=!1;for(var m in c)if(!O(m)){v=!0,y(e,o);break}!v&&c.class&&Qt(c.class)}}else t.data!==e.text&&(t.data=e.text);return!0}return function(t,o,i,a){if(!e(o)){var c,l=!1,p=[];if(e(t))l=!0,f(o,p);else{var d=n(t.nodeType);if(!d&&Qn(t,o))$(t,o,p,null,null,a);else{if(d){if(1===t.nodeType&&t.hasAttribute(D)&&(t.removeAttribute(D),i=!0),r(i)&&k(t,o,p))return x(o,p,!0),t;c=t,t=new lt(u.tagName(c).toLowerCase(),{},[],void 0,c)}var v=t.elm,h=u.parentNode(v);if(f(o,p,v._leaveCb?null:h,u.nextSibling(v)),n(o.parent))for(var y=o.parent,g=m(o);y;){for(var _=0;_<s.destroy.length;++_)s.destroy[_](y);if(y.elm=o.elm,g){for(var w=0;w<s.create.length;++w)s.create[w](Zn,y);var A=y.data.hook.insert;if(A.merged)for(var O=1;O<A.fns.length;O++)A.fns[O]()}else Gn(y);y=y.parent}n(h)?C(0,[t],0,0):n(t.tag)&&b(t)}}return x(o,p,l),o.elm}n(t)&&b(t)}}({nodeOps:Kn,modules:[lr,dr,wr,xr,Pr,H?{create:co,activate:co,remove:function(t,e){!0!==t.data.show?io(t,e):e()}}:{}].concat(ar)});q&&document.addEventListener("selectionchange",function(){var t=document.activeElement;t&&t.vmodel&&go(t,"input")});var lo={inserted:function(t,e,n,r){"select"===n.tag?(r.elm&&!r.elm._vOptions?ne(n,"postpatch",function(){lo.componentUpdated(t,e,n)}):fo(t,e,n.context),t._vOptions=[].map.call(t.options,ho)):("textarea"===n.tag||qn(t.type))&&(t._vModifiers=e.modifiers,e.modifiers.lazy||(t.addEventListener("compositionstart",mo),t.addEventListener("compositionend",yo),t.addEventListener("change",yo),q&&(t.vmodel=!0)))},componentUpdated:function(t,e,n){if("select"===n.tag){fo(t,e,n.context);var r=t._vOptions,o=t._vOptions=[].map.call(t.options,ho);if(o.some(function(t,e){return!j(t,r[e])}))(t.multiple?e.value.some(function(t){return vo(t,o)}):e.value!==e.oldValue&&vo(e.value,o))&&go(t,"change")}}};function fo(t,e,n){po(t,e,n),(W||K)&&setTimeout(function(){po(t,e,n)},0)}function po(t,e,n){var r=e.value,o=t.multiple;if(!o||Array.isArray(r)){for(var i,a,s=0,c=t.options.length;s<c;s++)if(a=t.options[s],o)i=I(r,ho(a))>-1,a.selected!==i&&(a.selected=i);else if(j(ho(a),r))return void(t.selectedIndex!==s&&(t.selectedIndex=s));o||(t.selectedIndex=-1)}}function vo(t,e){return e.every(function(e){return!j(e,t)})}function ho(t){return"_value"in t?t._value:t.value}function mo(t){t.target.composing=!0}function yo(t){t.target.composing&&(t.target.composing=!1,go(t.target,"input"))}function go(t,e){var n=document.createEvent("HTMLEvents");n.initEvent(e,!0,!0),t.dispatchEvent(n)}function _o(t){return!t.componentInstance||t.data&&t.data.transition?t:_o(t.componentInstance._vnode)}var bo={model:lo,show:{bind:function(t,e,n){var r=e.value,o=(n=_o(n)).data&&n.data.transition,i=t.__vOriginalDisplay="none"===t.style.display?"":t.style.display;r&&o?(n.data.show=!0,oo(n,function(){t.style.display=i})):t.style.display=r?i:"none"},update:function(t,e,n){var r=e.value;!r!=!e.oldValue&&((n=_o(n)).data&&n.data.transition?(n.data.show=!0,r?oo(n,function(){t.style.display=t.__vOriginalDisplay}):io(n,function(){t.style.display="none"})):t.style.display=r?t.__vOriginalDisplay:"none")},unbind:function(t,e,n,r,o){o||(t.style.display=t.__vOriginalDisplay)}}},Co={name:String,appear:Boolean,css:Boolean,mode:String,type:String,enterClass:String,leaveClass:String,enterToClass:String,leaveToClass:String,enterActiveClass:String,leaveActiveClass:String,appearClass:String,appearActiveClass:String,appearToClass:String,duration:[Number,String,Object]};function wo(t){var e=t&&t.componentOptions;return e&&e.Ctor.options.abstract?wo(He(e.children)):t}function Ao(t){var e={},n=t.$options;for(var r in n.propsData)e[r]=t[r];var o=n._parentListeners;for(var i in o)e[_(i)]=o[i];return e}function $o(t,e){if(/\d-keep-alive$/.test(e.tag))return t("keep-alive",{props:e.componentOptions.propsData})}var xo=function(t){return t.tag||Ue(t)},Oo=function(t){return"show"===t.name},ko={name:"transition",props:Co,abstract:!0,render:function(t){var e=this,n=this.$slots.default;if(n&&(n=n.filter(xo)).length){var r=this.mode,i=n[0];if(function(t){for(;t=t.parent;)if(t.data.transition)return!0}(this.$vnode))return i;var a=wo(i);if(!a)return i;if(this._leaving)return $o(t,i);var s="__transition-"+this._uid+"-";a.key=null==a.key?a.isComment?s+"comment":s+a.tag:o(a.key)?0===String(a.key).indexOf(s)?a.key:s+a.key:a.key;var c=(a.data||(a.data={})).transition=Ao(this),u=this._vnode,l=wo(u);if(a.data.directives&&a.data.directives.some(Oo)&&(a.data.show=!0),l&&l.data&&!function(t,e){return e.key===t.key&&e.tag===t.tag}(a,l)&&!Ue(l)&&(!l.componentInstance||!l.componentInstance._vnode.isComment)){var f=l.data.transition=x({},c);if("out-in"===r)return this._leaving=!0,ne(f,"afterLeave",function(){e._leaving=!1,e.$forceUpdate()}),$o(t,i);if("in-out"===r){if(Ue(a))return u;var p,d=function(){p()};ne(c,"afterEnter",d),ne(c,"enterCancelled",d),ne(f,"delayLeave",function(t){p=t})}}return i}}},So=x({tag:String,moveClass:String},Co);function Eo(t){t.elm._moveCb&&t.elm._moveCb(),t.elm._enterCb&&t.elm._enterCb()}function jo(t){t.data.newPos=t.elm.getBoundingClientRect()}function Io(t){var e=t.data.pos,n=t.data.newPos,r=e.left-n.left,o=e.top-n.top;if(r||o){t.data.moved=!0;var i=t.elm.style;i.transform=i.WebkitTransform="translate("+r+"px,"+o+"px)",i.transitionDuration="0s"}}delete So.mode;var To={Transition:ko,TransitionGroup:{props:So,beforeMount:function(){var t=this,e=this._update;this._update=function(n,r){var o=Ke(t);t.__patch__(t._vnode,t.kept,!1,!0),t._vnode=t.kept,o(),e.call(t,n,r)}},render:function(t){for(var e=this.tag||this.$vnode.data.tag||"span",n=Object.create(null),r=this.prevChildren=this.children,o=this.$slots.default||[],i=this.children=[],a=Ao(this),s=0;s<o.length;s++){var c=o[s];c.tag&&null!=c.key&&0!==String(c.key).indexOf("__vlist")&&(i.push(c),n[c.key]=c,(c.data||(c.data={})).transition=a)}if(r){for(var u=[],l=[],f=0;f<r.length;f++){var p=r[f];p.data.transition=a,p.data.pos=p.elm.getBoundingClientRect(),n[p.key]?u.push(p):l.push(p)}this.kept=t(e,null,u),this.removed=l}return t(e,null,i)},updated:function(){var t=this.prevChildren,e=this.moveClass||(this.name||"v")+"-move";t.length&&this.hasMove(t[0].elm,e)&&(t.forEach(Eo),t.forEach(jo),t.forEach(Io),this._reflow=document.body.offsetHeight,t.forEach(function(t){if(t.data.moved){var n=t.elm,r=n.style;Jr(n,e),r.transform=r.WebkitTransform=r.transitionDuration="",n.addEventListener(qr,n._moveCb=function t(r){r&&r.target!==n||r&&!/transform$/.test(r.propertyName)||(n.removeEventListener(qr,t),n._moveCb=null,Qr(n,e))})}}))},methods:{hasMove:function(t,e){if(!Vr)return!1;if(this._hasMove)return this._hasMove;var n=t.cloneNode();t._transitionClasses&&t._transitionClasses.forEach(function(t){Rr(n,t)}),Fr(n,e),n.style.display="none",this.$el.appendChild(n);var r=eo(n);return this.$el.removeChild(n),this._hasMove=r.hasTransform}}}};return _n.config.mustUseProp=function(t,e,n){return"value"===n&&Sn(t)&&"button"!==e||"selected"===n&&"option"===t||"checked"===n&&"input"===t||"muted"===n&&"video"===t},_n.config.isReservedTag=zn,_n.config.isReservedAttr=kn,_n.config.getTagNamespace=function(t){return Bn(t)?"svg":"math"===t?"math":void 0},_n.config.isUnknownElement=function(t){if(!H)return!0;if(zn(t))return!1;if(t=t.toLowerCase(),null!=Wn[t])return Wn[t];var e=document.createElement(t);return t.indexOf("-")>-1?Wn[t]=e.constructor===window.HTMLUnknownElement||e.constructor===window.HTMLElement:Wn[t]=/HTMLUnknownElement/.test(e.toString())},x(_n.options.directives,bo),x(_n.options.components,To),_n.prototype.__patch__=H?uo:k,_n.prototype.$mount=function(t,e){return function(t,e,n){var r;return t.$el=e,t.$options.render||(t.$options.render=pt),Ze(t,"beforeMount"),r=function(){t._update(t._render(),n)},new cn(t,r,k,{before:function(){t._isMounted&&!t._isDestroyed&&Ze(t,"beforeUpdate")}},!0),n=!1,null==t.$vnode&&(t._isMounted=!0,Ze(t,"mounted")),t}(this,t=t&&H?function(t){if("string"==typeof t){var e=document.querySelector(t);return e||document.createElement("div")}return t}(t):void 0,e)},H&&setTimeout(function(){P.devtools&&tt&&tt.emit("init",_n)},0),_n});
\ No newline at end of file
diff --git a/packages/vue-server-renderer/basic.js b/packages/vue-server-renderer/basic.js
index 631fa00807f..abf4cb483df 100644
--- a/packages/vue-server-renderer/basic.js
+++ b/packages/vue-server-renderer/basic.js
@@ -694,6 +694,7 @@
   var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
   var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
   var isPhantomJS = UA && /phantomjs/.test(UA);
+  var isFF = UA && UA.match(/firefox\/(\d+)/);
 
   // Firefox has a "watch" function on Object.prototype...
   var nativeWatch = ({}).watch;
@@ -3814,6 +3815,8 @@
 
   var decodeHTMLCached = cached(he.decode);
 
+  var emptySlotScopeToken = "_empty_";
+
   // configurable state
   var warn$1;
   var delimiters;
@@ -4426,7 +4429,7 @@
           var dynamic = ref.dynamic;
           el.slotTarget = name;
           el.slotTargetDynamic = dynamic;
-          el.slotScope = slotBinding.value || "_"; // force it into a scoped slot for perf
+          el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
         }
       } else {
         // v-slot on component, denotes default slot
@@ -4461,8 +4464,13 @@
           var slotContainer = slots[name$1] = createASTElement('template', [], el);
           slotContainer.slotTarget = name$1;
           slotContainer.slotTargetDynamic = dynamic$1;
-          slotContainer.children = el.children.filter(function (c) { return !(c).slotScope; });
-          slotContainer.slotScope = slotBinding$1.value || "_";
+          slotContainer.children = el.children.filter(function (c) {
+            if (!c.slotScope) {
+              c.parent = slotContainer;
+              return true
+            }
+          });
+          slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
           // remove children as they are returned from scopedSlots now
           el.children = [];
           // mark el non-plain so data gets generated
@@ -5430,7 +5438,7 @@
     }
     // scoped slots
     if (el.scopedSlots) {
-      data += (genScopedSlots(el.scopedSlots, state)) + ",";
+      data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
     }
     // component v-model
     if (el.model) {
@@ -5501,16 +5509,34 @@
   }
 
   function genScopedSlots (
+    el,
     slots,
     state
   ) {
-    var hasDynamicKeys = Object.keys(slots).some(function (key) {
+    // by default scoped slots are considered "stable", this allows child
+    // components with only scoped slots to skip forced updates from parent.
+    // but in some cases we have to bail-out of this optimization
+    // for example if the slot contains dynamic names, has v-if or v-for on them...
+    var needsForceUpdate = Object.keys(slots).some(function (key) {
       var slot = slots[key];
       return slot.slotTargetDynamic || slot.if || slot.for
     });
+    // OR when it is inside another scoped slot (the reactivity is disconnected)
+    // #9438
+    if (!needsForceUpdate) {
+      var parent = el.parent;
+      while (parent) {
+        if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+          needsForceUpdate = true;
+          break
+        }
+        parent = parent.parent;
+      }
+    }
+
     return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
         return genScopedSlot(slots[key], state)
-      }).join(',')) + "]" + (hasDynamicKeys ? ",true" : "") + ")")
+      }).join(',')) + "]" + (needsForceUpdate ? ",true" : "") + ")")
   }
 
   function genScopedSlot (
@@ -5524,7 +5550,10 @@
     if (el.for && !el.forProcessed) {
       return genFor(el, state, genScopedSlot)
     }
-    var fn = "function(" + (String(el.slotScope)) + "){" +
+    var slotScope = el.slotScope === emptySlotScopeToken
+      ? ""
+      : String(el.slotScope);
+    var fn = "function(" + slotScope + "){" +
       "return " + (el.tag === 'template'
         ? el.if && isLegacySyntax
           ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
@@ -5617,7 +5646,14 @@
     var slotName = el.slotName || '"default"';
     var children = genChildren(el, state);
     var res = "_t(" + slotName + (children ? ("," + children) : '');
-    var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
+    var attrs = el.attrs || el.dynamicAttrs
+      ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+          // slot props are camelized
+          name: camelize(attr.name),
+          value: attr.value,
+          dynamic: attr.dynamic
+        }); }))
+      : null;
     var bind$$1 = el.attrsMap['v-bind'];
     if ((attrs || bind$$1) && !children) {
       res += ",null";
@@ -6945,900 +6981,896 @@
 
   /*  */
 
-  function ensureCtor (comp, base) {
-    if (
-      comp.__esModule ||
-      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-    ) {
-      comp = comp.default;
-    }
-    return isObject(comp)
-      ? base.extend(comp)
-      : comp
-  }
+  var SIMPLE_NORMALIZE = 1;
+  var ALWAYS_NORMALIZE = 2;
 
-  function createAsyncPlaceholder (
-    factory,
-    data,
+  // wrapper function for providing a more flexible interface
+  // without getting yelled at by flow
+  function createElement (
     context,
+    tag,
+    data,
     children,
-    tag
+    normalizationType,
+    alwaysNormalize
   ) {
-    var node = createEmptyVNode();
-    node.asyncFactory = factory;
-    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-    return node
+    if (Array.isArray(data) || isPrimitive(data)) {
+      normalizationType = children;
+      children = data;
+      data = undefined;
+    }
+    if (isTrue(alwaysNormalize)) {
+      normalizationType = ALWAYS_NORMALIZE;
+    }
+    return _createElement(context, tag, data, children, normalizationType)
   }
 
-  function resolveAsyncComponent (
-    factory,
-    baseCtor,
-    context
+  function _createElement (
+    context,
+    tag,
+    data,
+    children,
+    normalizationType
   ) {
-    if (isTrue(factory.error) && isDef(factory.errorComp)) {
-      return factory.errorComp
+    if (isDef(data) && isDef((data).__ob__)) {
+      warn(
+        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+        'Always create fresh vnode data objects in each render!',
+        context
+      );
+      return createEmptyVNode()
     }
-
-    if (isDef(factory.resolved)) {
-      return factory.resolved
+    // object syntax in v-bind
+    if (isDef(data) && isDef(data.is)) {
+      tag = data.is;
     }
-
-    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-      return factory.loadingComp
+    if (!tag) {
+      // in case of component :is set to falsy value
+      return createEmptyVNode()
     }
-
-    if (isDef(factory.contexts)) {
-      // already pending
-      factory.contexts.push(context);
-    } else {
-      var contexts = factory.contexts = [context];
-      var sync = true;
-
-      var forceRender = function (renderCompleted) {
-        for (var i = 0, l = contexts.length; i < l; i++) {
-          contexts[i].$forceUpdate();
-        }
-
-        if (renderCompleted) {
-          contexts.length = 0;
-        }
-      };
-
-      var resolve = once(function (res) {
-        // cache resolved
-        factory.resolved = ensureCtor(res, baseCtor);
-        // invoke callbacks only if this is not a synchronous resolve
-        // (async resolves are shimmed as synchronous during SSR)
-        if (!sync) {
-          forceRender(true);
-        } else {
-          contexts.length = 0;
-        }
-      });
-
-      var reject = once(function (reason) {
+    // warn against non-primitive key
+    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+    ) {
+      {
         warn(
-          "Failed to resolve async component: " + (String(factory)) +
-          (reason ? ("\nReason: " + reason) : '')
+          'Avoid using non-primitive value as key, ' +
+          'use string/number value instead.',
+          context
         );
-        if (isDef(factory.errorComp)) {
-          factory.error = true;
-          forceRender(true);
-        }
-      });
-
-      var res = factory(resolve, reject);
-
-      if (isObject(res)) {
-        if (isPromise(res)) {
-          // () => Promise
-          if (isUndef(factory.resolved)) {
-            res.then(resolve, reject);
-          }
-        } else if (isPromise(res.component)) {
-          res.component.then(resolve, reject);
-
-          if (isDef(res.error)) {
-            factory.errorComp = ensureCtor(res.error, baseCtor);
-          }
-
-          if (isDef(res.loading)) {
-            factory.loadingComp = ensureCtor(res.loading, baseCtor);
-            if (res.delay === 0) {
-              factory.loading = true;
-            } else {
-              setTimeout(function () {
-                if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                  factory.loading = true;
-                  forceRender(false);
-                }
-              }, res.delay || 200);
-            }
-          }
-
-          if (isDef(res.timeout)) {
-            setTimeout(function () {
-              if (isUndef(factory.resolved)) {
-                reject(
-                  "timeout (" + (res.timeout) + "ms)"
-                );
-              }
-            }, res.timeout);
-          }
-        }
       }
-
-      sync = false;
-      // return in case resolved synchronously
-      return factory.loading
-        ? factory.loadingComp
-        : factory.resolved
+    }
+    // support single function children as default scoped slot
+    if (Array.isArray(children) &&
+      typeof children[0] === 'function'
+    ) {
+      data = data || {};
+      data.scopedSlots = { default: children[0] };
+      children.length = 0;
+    }
+    if (normalizationType === ALWAYS_NORMALIZE) {
+      children = normalizeChildren(children);
+    } else if (normalizationType === SIMPLE_NORMALIZE) {
+      children = simpleNormalizeChildren(children);
+    }
+    var vnode, ns;
+    if (typeof tag === 'string') {
+      var Ctor;
+      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+      if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+        // component
+        vnode = createComponent(Ctor, data, context, children, tag);
+      } else {
+        // unknown or unlisted namespaced elements
+        // check at runtime because it may get assigned a namespace when its
+        // parent normalizes children
+        vnode = new VNode(
+          tag, data, children,
+          undefined, undefined, context
+        );
+      }
+    } else {
+      // direct component options / constructor
+      vnode = createComponent(tag, data, context, children);
+    }
+    if (Array.isArray(vnode)) {
+      return vnode
+    } else if (isDef(vnode)) {
+      if (isDef(ns)) { applyNS(vnode, ns); }
+      if (isDef(data)) { registerDeepBindings(data); }
+      return vnode
+    } else {
+      return createEmptyVNode()
     }
   }
 
-  /*  */
-
-  /*  */
-
-  /*  */
-
-  /*  */
-
-  var target;
-
-  function add (event, fn) {
-    target.$on(event, fn);
-  }
-
-  function remove$1 (event, fn) {
-    target.$off(event, fn);
+  function applyNS (vnode, ns, force) {
+    vnode.ns = ns;
+    if (vnode.tag === 'foreignObject') {
+      // use default namespace inside foreignObject
+      ns = undefined;
+      force = true;
+    }
+    if (isDef(vnode.children)) {
+      for (var i = 0, l = vnode.children.length; i < l; i++) {
+        var child = vnode.children[i];
+        if (isDef(child.tag) && (
+          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+          applyNS(child, ns, force);
+        }
+      }
+    }
   }
 
-  function createOnceHandler (event, fn) {
-    var _target = target;
-    return function onceHandler () {
-      var res = fn.apply(null, arguments);
-      if (res !== null) {
-        _target.$off(event, onceHandler);
-      }
+  // ref #5318
+  // necessary to ensure parent re-render when deep bindings like :style and
+  // :class are used on slot nodes
+  function registerDeepBindings (data) {
+    if (isObject(data.style)) {
+      traverse(data.style);
+    }
+    if (isObject(data.class)) {
+      traverse(data.class);
     }
   }
 
-  function updateComponentListeners (
-    vm,
-    listeners,
-    oldListeners
-  ) {
-    target = vm;
-    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-    target = undefined;
-  }
-
   /*  */
 
-
-
   /**
-   * Runtime helper for resolving raw children VNodes into a slot object.
+   * Runtime helper for rendering v-for lists.
    */
-  function resolveSlots (
-    children,
-    context
+  function renderList (
+    val,
+    render
   ) {
-    if (!children || !children.length) {
-      return {}
-    }
-    var slots = {};
-    for (var i = 0, l = children.length; i < l; i++) {
-      var child = children[i];
-      var data = child.data;
-      // remove slot attribute if the node is resolved as a Vue slot node
-      if (data && data.attrs && data.attrs.slot) {
-        delete data.attrs.slot;
+    var ret, i, l, keys, key;
+    if (Array.isArray(val) || typeof val === 'string') {
+      ret = new Array(val.length);
+      for (i = 0, l = val.length; i < l; i++) {
+        ret[i] = render(val[i], i);
       }
-      // named slots should only be respected if the vnode was rendered in the
-      // same context.
-      if ((child.context === context || child.fnContext === context) &&
-        data && data.slot != null
-      ) {
-        var name = data.slot;
-        var slot = (slots[name] || (slots[name] = []));
-        if (child.tag === 'template') {
-          slot.push.apply(slot, child.children || []);
-        } else {
-          slot.push(child);
+    } else if (typeof val === 'number') {
+      ret = new Array(val);
+      for (i = 0; i < val; i++) {
+        ret[i] = render(i + 1, i);
+      }
+    } else if (isObject(val)) {
+      if (hasSymbol && val[Symbol.iterator]) {
+        ret = [];
+        var iterator = val[Symbol.iterator]();
+        var result = iterator.next();
+        while (!result.done) {
+          ret.push(render(result.value, ret.length));
+          result = iterator.next();
         }
       } else {
-        (slots.default || (slots.default = [])).push(child);
+        keys = Object.keys(val);
+        ret = new Array(keys.length);
+        for (i = 0, l = keys.length; i < l; i++) {
+          key = keys[i];
+          ret[i] = render(val[key], key, i);
+        }
       }
     }
-    // ignore slots that contains only whitespace
-    for (var name$1 in slots) {
-      if (slots[name$1].every(isWhitespace)) {
-        delete slots[name$1];
-      }
+    if (!isDef(ret)) {
+      ret = [];
     }
-    return slots
+    (ret)._isVList = true;
+    return ret
   }
 
-  function isWhitespace (node) {
-    return (node.isComment && !node.asyncFactory) || node.text === ' '
-  }
+  /*  */
 
-  function resolveScopedSlots (
-    fns, // see flow/vnode
-    hasDynamicKeys,
-    res
+  /**
+   * Runtime helper for rendering <slot>
+   */
+  function renderSlot (
+    name,
+    fallback,
+    props,
+    bindObject
   ) {
-    res = res || { $stable: !hasDynamicKeys };
-    for (var i = 0; i < fns.length; i++) {
-      var slot = fns[i];
-      if (Array.isArray(slot)) {
-        resolveScopedSlots(slot, hasDynamicKeys, res);
-      } else if (slot) {
-        res[slot.key] = slot.fn;
+    var scopedSlotFn = this.$scopedSlots[name];
+    var nodes;
+    if (scopedSlotFn) { // scoped slot
+      props = props || {};
+      if (bindObject) {
+        if (!isObject(bindObject)) {
+          warn(
+            'slot v-bind without argument expects an Object',
+            this
+          );
+        }
+        props = extend(extend({}, bindObject), props);
       }
+      nodes = scopedSlotFn(props) || fallback;
+    } else {
+      nodes = this.$slots[name] || fallback;
+    }
+
+    var target = props && props.slot;
+    if (target) {
+      return this.$createElement('template', { slot: target }, nodes)
+    } else {
+      return nodes
     }
-    return res
   }
 
   /*  */
 
-  var activeInstance = null;
+  /**
+   * Runtime helper for resolving filters
+   */
+  function resolveFilter (id) {
+    return resolveAsset(this.$options, 'filters', id, true) || identity
+  }
 
-  function updateChildComponent (
-    vm,
-    propsData,
-    listeners,
-    parentVnode,
-    renderChildren
-  ) {
+  /*  */
 
-    // determine whether component has slot children
-    // we need to do this before overwriting $options._renderChildren.
+  function isKeyNotMatch (expect, actual) {
+    if (Array.isArray(expect)) {
+      return expect.indexOf(actual) === -1
+    } else {
+      return expect !== actual
+    }
+  }
 
-    // check if there are dynamic scopedSlots (hand-written or compiled but with
-    // dynamic slot names). Static scoped slots compiled from template has the
-    // "$stable" marker.
-    var hasDynamicScopedSlot = !!(
-      (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-      (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-    );
-    // Any static slot children from the parent may have changed during parent's
-    // update. Dynamic scoped slots may also have changed. In such cases, a forced
-    // update is necessary to ensure correctness.
-    var needsForceUpdate = !!(
-      renderChildren ||               // has new static slots
-      vm.$options._renderChildren ||  // has old static slots
-      hasDynamicScopedSlot
-    );
+  /**
+   * Runtime helper for checking keyCodes from config.
+   * exposed as Vue.prototype._k
+   * passing in eventKeyName as last argument separately for backwards compat
+   */
+  function checkKeyCodes (
+    eventKeyCode,
+    key,
+    builtInKeyCode,
+    eventKeyName,
+    builtInKeyName
+  ) {
+    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+      return isKeyNotMatch(builtInKeyName, eventKeyName)
+    } else if (mappedKeyCode) {
+      return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+    } else if (eventKeyName) {
+      return hyphenate(eventKeyName) !== key
+    }
+  }
 
-    vm.$options._parentVnode = parentVnode;
-    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+  /*  */
 
-    if (vm._vnode) { // update child tree's parent
-      vm._vnode.parent = parentVnode;
-    }
-    vm.$options._renderChildren = renderChildren;
+  /**
+   * Runtime helper for merging v-bind="object" into a VNode's data.
+   */
+  function bindObjectProps (
+    data,
+    tag,
+    value,
+    asProp,
+    isSync
+  ) {
+    if (value) {
+      if (!isObject(value)) {
+        warn(
+          'v-bind without argument expects an Object or Array value',
+          this
+        );
+      } else {
+        if (Array.isArray(value)) {
+          value = toObject(value);
+        }
+        var hash;
+        var loop = function ( key ) {
+          if (
+            key === 'class' ||
+            key === 'style' ||
+            isReservedAttribute(key)
+          ) {
+            hash = data;
+          } else {
+            var type = data.attrs && data.attrs.type;
+            hash = asProp || config.mustUseProp(tag, type, key)
+              ? data.domProps || (data.domProps = {})
+              : data.attrs || (data.attrs = {});
+          }
+          var camelizedKey = camelize(key);
+          if (!(key in hash) && !(camelizedKey in hash)) {
+            hash[key] = value[key];
 
-    // update $attrs and $listeners hash
-    // these are also reactive so they may trigger child update if the child
-    // used them during render
-    vm.$attrs = parentVnode.data.attrs || emptyObject;
-    vm.$listeners = listeners || emptyObject;
+            if (isSync) {
+              var on = data.on || (data.on = {});
+              on[("update:" + camelizedKey)] = function ($event) {
+                value[key] = $event;
+              };
+            }
+          }
+        };
 
-    // update props
-    if (propsData && vm.$options.props) {
-      toggleObserving(false);
-      var props = vm._props;
-      var propKeys = vm.$options._propKeys || [];
-      for (var i = 0; i < propKeys.length; i++) {
-        var key = propKeys[i];
-        var propOptions = vm.$options.props; // wtf flow?
-        props[key] = validateProp(key, propOptions, propsData, vm);
+        for (var key in value) loop( key );
       }
-      toggleObserving(true);
-      // keep a copy of raw propsData
-      vm.$options.propsData = propsData;
     }
+    return data
+  }
 
-    // update listeners
-    listeners = listeners || emptyObject;
-    var oldListeners = vm.$options._parentListeners;
-    vm.$options._parentListeners = listeners;
-    updateComponentListeners(vm, listeners, oldListeners);
+  /*  */
 
-    // resolve slots + force update if has children
-    if (needsForceUpdate) {
-      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-      vm.$forceUpdate();
+  /**
+   * Runtime helper for rendering static trees.
+   */
+  function renderStatic (
+    index,
+    isInFor
+  ) {
+    var cached = this._staticTrees || (this._staticTrees = []);
+    var tree = cached[index];
+    // if has already-rendered static tree and not inside v-for,
+    // we can reuse the same tree.
+    if (tree && !isInFor) {
+      return tree
     }
+    // otherwise, render a fresh tree.
+    tree = cached[index] = this.$options.staticRenderFns[index].call(
+      this._renderProxy,
+      null,
+      this // for render fns generated for functional component templates
+    );
+    markStatic(tree, ("__static__" + index), false);
+    return tree
   }
 
-  function isInInactiveTree (vm) {
-    while (vm && (vm = vm.$parent)) {
-      if (vm._inactive) { return true }
-    }
-    return false
+  /**
+   * Runtime helper for v-once.
+   * Effectively it means marking the node as static with a unique key.
+   */
+  function markOnce (
+    tree,
+    index,
+    key
+  ) {
+    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+    return tree
   }
 
-  function activateChildComponent (vm, direct) {
-    if (direct) {
-      vm._directInactive = false;
-      if (isInInactiveTree(vm)) {
-        return
-      }
-    } else if (vm._directInactive) {
-      return
-    }
-    if (vm._inactive || vm._inactive === null) {
-      vm._inactive = false;
-      for (var i = 0; i < vm.$children.length; i++) {
-        activateChildComponent(vm.$children[i]);
+  function markStatic (
+    tree,
+    key,
+    isOnce
+  ) {
+    if (Array.isArray(tree)) {
+      for (var i = 0; i < tree.length; i++) {
+        if (tree[i] && typeof tree[i] !== 'string') {
+          markStaticNode(tree[i], (key + "_" + i), isOnce);
+        }
       }
-      callHook(vm, 'activated');
+    } else {
+      markStaticNode(tree, key, isOnce);
     }
   }
 
-  function deactivateChildComponent (vm, direct) {
-    if (direct) {
-      vm._directInactive = true;
-      if (isInInactiveTree(vm)) {
-        return
-      }
-    }
-    if (!vm._inactive) {
-      vm._inactive = true;
-      for (var i = 0; i < vm.$children.length; i++) {
-        deactivateChildComponent(vm.$children[i]);
+  function markStaticNode (node, key, isOnce) {
+    node.isStatic = true;
+    node.key = key;
+    node.isOnce = isOnce;
+  }
+
+  /*  */
+
+  function bindObjectListeners (data, value) {
+    if (value) {
+      if (!isPlainObject(value)) {
+        warn(
+          'v-on without argument expects an Object value',
+          this
+        );
+      } else {
+        var on = data.on = data.on ? extend({}, data.on) : {};
+        for (var key in value) {
+          var existing = on[key];
+          var ours = value[key];
+          on[key] = existing ? [].concat(existing, ours) : ours;
+        }
       }
-      callHook(vm, 'deactivated');
     }
+    return data
   }
 
-  function callHook (vm, hook) {
-    // #7573 disable dep collection when invoking lifecycle hooks
-    pushTarget();
-    var handlers = vm.$options[hook];
-    var info = hook + " hook";
-    if (handlers) {
-      for (var i = 0, j = handlers.length; i < j; i++) {
-        invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+  /*  */
+
+  function resolveScopedSlots (
+    fns, // see flow/vnode
+    hasDynamicKeys,
+    res
+  ) {
+    res = res || { $stable: !hasDynamicKeys };
+    for (var i = 0; i < fns.length; i++) {
+      var slot = fns[i];
+      if (Array.isArray(slot)) {
+        resolveScopedSlots(slot, hasDynamicKeys, res);
+      } else if (slot) {
+        res[slot.key] = slot.fn;
       }
     }
-    if (vm._hasHookEvent) {
-      vm.$emit('hook:' + hook);
-    }
-    popTarget();
+    return res
   }
 
   /*  */
 
-  // Async edge case fix requires storing an event listener's attach timestamp.
-  var getNow = Date.now;
-
-  // Determine what event timestamp the browser is using. Annoyingly, the
-  // timestamp can either be hi-res ( relative to poge load) or low-res
-  // (relative to UNIX epoch), so in order to compare time we have to use the
-  // same timestamp type when saving the flush timestamp.
-  if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-    // if the low-res timestamp which is bigger than the event timestamp
-    // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-    // and we need to use the hi-res version for event listeners as well.
-    getNow = function () { return performance.now(); };
+  function bindDynamicKeys (baseObj, values) {
+    for (var i = 0; i < values.length; i += 2) {
+      var key = values[i];
+      if (typeof key === 'string' && key) {
+        baseObj[values[i]] = values[i + 1];
+      } else if (key !== '' && key !== null) {
+        // null is a speical value for explicitly removing a binding
+        warn(
+          ("Invalid value for dynamic directive argument (expected string or null): " + key),
+          this
+        );
+      }
+    }
+    return baseObj
   }
 
-  /**
-   * Queue a kept-alive component that was activated during patch.
-   * The queue will be processed after the entire tree has been patched.
-   */
-  function queueActivatedComponent (vm) {
-    // setting _inactive to false here so that a render function can
-    // rely on checking whether it's in an inactive tree (e.g. router-view)
-    vm._inactive = false;
+  // helper to dynamically append modifier runtime markers to event names.
+  // ensure only append when value is already string, otherwise it will be cast
+  // to string and cause the type check to miss.
+  function prependModifier (value, symbol) {
+    return typeof value === 'string' ? symbol + value : value
   }
 
   /*  */
 
-  /*  */
+  function installRenderHelpers (target) {
+    target._o = markOnce;
+    target._n = toNumber;
+    target._s = toString;
+    target._l = renderList;
+    target._t = renderSlot;
+    target._q = looseEqual;
+    target._i = looseIndexOf;
+    target._m = renderStatic;
+    target._f = resolveFilter;
+    target._k = checkKeyCodes;
+    target._b = bindObjectProps;
+    target._v = createTextVNode;
+    target._e = createEmptyVNode;
+    target._u = resolveScopedSlots;
+    target._g = bindObjectListeners;
+    target._d = bindDynamicKeys;
+    target._p = prependModifier;
+  }
 
   /*  */
 
-  var SIMPLE_NORMALIZE = 1;
-  var ALWAYS_NORMALIZE = 2;
 
-  // wrapper function for providing a more flexible interface
-  // without getting yelled at by flow
-  function createElement (
-    context,
-    tag,
-    data,
+
+  /**
+   * Runtime helper for resolving raw children VNodes into a slot object.
+   */
+  function resolveSlots (
     children,
-    normalizationType,
-    alwaysNormalize
+    context
   ) {
-    if (Array.isArray(data) || isPrimitive(data)) {
-      normalizationType = children;
-      children = data;
-      data = undefined;
+    if (!children || !children.length) {
+      return {}
     }
-    if (isTrue(alwaysNormalize)) {
-      normalizationType = ALWAYS_NORMALIZE;
+    var slots = {};
+    for (var i = 0, l = children.length; i < l; i++) {
+      var child = children[i];
+      var data = child.data;
+      // remove slot attribute if the node is resolved as a Vue slot node
+      if (data && data.attrs && data.attrs.slot) {
+        delete data.attrs.slot;
+      }
+      // named slots should only be respected if the vnode was rendered in the
+      // same context.
+      if ((child.context === context || child.fnContext === context) &&
+        data && data.slot != null
+      ) {
+        var name = data.slot;
+        var slot = (slots[name] || (slots[name] = []));
+        if (child.tag === 'template') {
+          slot.push.apply(slot, child.children || []);
+        } else {
+          slot.push(child);
+        }
+      } else {
+        (slots.default || (slots.default = [])).push(child);
+      }
     }
-    return _createElement(context, tag, data, children, normalizationType)
+    // ignore slots that contains only whitespace
+    for (var name$1 in slots) {
+      if (slots[name$1].every(isWhitespace)) {
+        delete slots[name$1];
+      }
+    }
+    return slots
   }
 
-  function _createElement (
-    context,
-    tag,
-    data,
-    children,
-    normalizationType
-  ) {
-    if (isDef(data) && isDef((data).__ob__)) {
-      warn(
-        "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-        'Always create fresh vnode data objects in each render!',
-        context
-      );
-      return createEmptyVNode()
-    }
-    // object syntax in v-bind
-    if (isDef(data) && isDef(data.is)) {
-      tag = data.is;
-    }
-    if (!tag) {
-      // in case of component :is set to falsy value
-      return createEmptyVNode()
-    }
-    // warn against non-primitive key
-    if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-    ) {
-      {
-        warn(
-          'Avoid using non-primitive value as key, ' +
-          'use string/number value instead.',
-          context
-        );
-      }
-    }
-    // support single function children as default scoped slot
-    if (Array.isArray(children) &&
-      typeof children[0] === 'function'
-    ) {
-      data = data || {};
-      data.scopedSlots = { default: children[0] };
-      children.length = 0;
-    }
-    if (normalizationType === ALWAYS_NORMALIZE) {
-      children = normalizeChildren(children);
-    } else if (normalizationType === SIMPLE_NORMALIZE) {
-      children = simpleNormalizeChildren(children);
-    }
-    var vnode, ns;
-    if (typeof tag === 'string') {
-      var Ctor;
-      ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-      if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-        // component
-        vnode = createComponent(Ctor, data, context, children, tag);
-      } else {
-        // unknown or unlisted namespaced elements
-        // check at runtime because it may get assigned a namespace when its
-        // parent normalizes children
-        vnode = new VNode(
-          tag, data, children,
-          undefined, undefined, context
-        );
-      }
-    } else {
-      // direct component options / constructor
-      vnode = createComponent(tag, data, context, children);
-    }
-    if (Array.isArray(vnode)) {
-      return vnode
-    } else if (isDef(vnode)) {
-      if (isDef(ns)) { applyNS(vnode, ns); }
-      if (isDef(data)) { registerDeepBindings(data); }
-      return vnode
-    } else {
-      return createEmptyVNode()
-    }
-  }
-
-  function applyNS (vnode, ns, force) {
-    vnode.ns = ns;
-    if (vnode.tag === 'foreignObject') {
-      // use default namespace inside foreignObject
-      ns = undefined;
-      force = true;
-    }
-    if (isDef(vnode.children)) {
-      for (var i = 0, l = vnode.children.length; i < l; i++) {
-        var child = vnode.children[i];
-        if (isDef(child.tag) && (
-          isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-          applyNS(child, ns, force);
-        }
-      }
-    }
-  }
-
-  // ref #5318
-  // necessary to ensure parent re-render when deep bindings like :style and
-  // :class are used on slot nodes
-  function registerDeepBindings (data) {
-    if (isObject(data.style)) {
-      traverse(data.style);
-    }
-    if (isObject(data.class)) {
-      traverse(data.class);
-    }
+  function isWhitespace (node) {
+    return (node.isComment && !node.asyncFactory) || node.text === ' '
   }
 
   /*  */
 
-  /**
-   * Runtime helper for rendering v-for lists.
-   */
-  function renderList (
-    val,
-    render
+  function normalizeScopedSlots (
+    slots,
+    normalSlots
   ) {
-    var ret, i, l, keys, key;
-    if (Array.isArray(val) || typeof val === 'string') {
-      ret = new Array(val.length);
-      for (i = 0, l = val.length; i < l; i++) {
-        ret[i] = render(val[i], i);
-      }
-    } else if (typeof val === 'number') {
-      ret = new Array(val);
-      for (i = 0; i < val; i++) {
-        ret[i] = render(i + 1, i);
-      }
-    } else if (isObject(val)) {
-      if (hasSymbol && val[Symbol.iterator]) {
-        ret = [];
-        var iterator = val[Symbol.iterator]();
-        var result = iterator.next();
-        while (!result.done) {
-          ret.push(render(result.value, ret.length));
-          result = iterator.next();
-        }
-      } else {
-        keys = Object.keys(val);
-        ret = new Array(keys.length);
-        for (i = 0, l = keys.length; i < l; i++) {
-          key = keys[i];
-          ret[i] = render(val[key], key, i);
+    var res;
+    if (!slots) {
+      res = {};
+    } else if (slots._normalized) {
+      return slots
+    } else {
+      res = {};
+      for (var key in slots) {
+        if (slots[key] && key[0] !== '$') {
+          res[key] = normalizeScopedSlot(slots[key]);
         }
       }
     }
-    if (!isDef(ret)) {
-      ret = [];
+    // expose normal slots on scopedSlots
+    for (var key$1 in normalSlots) {
+      if (!(key$1 in res)) {
+        res[key$1] = proxyNormalSlot(normalSlots, key$1);
+      }
     }
-    (ret)._isVList = true;
-    return ret
+    def(res, '_normalized', true);
+    def(res, '$stable', slots ? !!slots.$stable : true);
+    return res
   }
 
-  /*  */
-
-  /**
-   * Runtime helper for rendering <slot>
-   */
-  function renderSlot (
-    name,
-    fallback,
-    props,
-    bindObject
-  ) {
-    var scopedSlotFn = this.$scopedSlots[name];
-    var nodes;
-    if (scopedSlotFn) { // scoped slot
-      props = props || {};
-      if (bindObject) {
-        if (!isObject(bindObject)) {
-          warn(
-            'slot v-bind without argument expects an Object',
-            this
-          );
-        }
-        props = extend(extend({}, bindObject), props);
-      }
-      nodes = scopedSlotFn(props) || fallback;
-    } else {
-      nodes = this.$slots[name] || fallback;
+  function normalizeScopedSlot(fn) {
+    return function (scope) {
+      var res = fn(scope);
+      return res && typeof res === 'object' && !Array.isArray(res)
+        ? [res] // single vnode
+        : normalizeChildren(res)
     }
+  }
 
-    var target = props && props.slot;
-    if (target) {
-      return this.$createElement('template', { slot: target }, nodes)
-    } else {
-      return nodes
-    }
+  function proxyNormalSlot(slots, key) {
+    return function () { return slots[key]; }
   }
 
   /*  */
 
-  /**
-   * Runtime helper for resolving filters
-   */
-  function resolveFilter (id) {
-    return resolveAsset(this.$options, 'filters', id, true) || identity
-  }
+  var currentRenderingInstance = null;
 
   /*  */
 
-  function isKeyNotMatch (expect, actual) {
-    if (Array.isArray(expect)) {
-      return expect.indexOf(actual) === -1
-    } else {
-      return expect !== actual
+  function ensureCtor (comp, base) {
+    if (
+      comp.__esModule ||
+      (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+    ) {
+      comp = comp.default;
     }
+    return isObject(comp)
+      ? base.extend(comp)
+      : comp
   }
 
-  /**
-   * Runtime helper for checking keyCodes from config.
-   * exposed as Vue.prototype._k
-   * passing in eventKeyName as last argument separately for backwards compat
-   */
-  function checkKeyCodes (
-    eventKeyCode,
-    key,
-    builtInKeyCode,
-    eventKeyName,
-    builtInKeyName
+  function createAsyncPlaceholder (
+    factory,
+    data,
+    context,
+    children,
+    tag
   ) {
-    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-      return isKeyNotMatch(builtInKeyName, eventKeyName)
-    } else if (mappedKeyCode) {
-      return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-    } else if (eventKeyName) {
-      return hyphenate(eventKeyName) !== key
-    }
+    var node = createEmptyVNode();
+    node.asyncFactory = factory;
+    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+    return node
   }
 
-  /*  */
-
-  /**
-   * Runtime helper for merging v-bind="object" into a VNode's data.
-   */
-  function bindObjectProps (
-    data,
-    tag,
-    value,
-    asProp,
-    isSync
+  function resolveAsyncComponent (
+    factory,
+    baseCtor
   ) {
-    if (value) {
-      if (!isObject(value)) {
+    if (isTrue(factory.error) && isDef(factory.errorComp)) {
+      return factory.errorComp
+    }
+
+    if (isDef(factory.resolved)) {
+      return factory.resolved
+    }
+
+    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+      return factory.loadingComp
+    }
+
+    var owner = currentRenderingInstance;
+    if (isDef(factory.owners)) {
+      // already pending
+      factory.owners.push(owner);
+    } else {
+      var owners = factory.owners = [owner];
+      var sync = true;
+
+      var forceRender = function (renderCompleted) {
+        for (var i = 0, l = owners.length; i < l; i++) {
+          (owners[i]).$forceUpdate();
+        }
+
+        if (renderCompleted) {
+          owners.length = 0;
+        }
+      };
+
+      var resolve = once(function (res) {
+        // cache resolved
+        factory.resolved = ensureCtor(res, baseCtor);
+        // invoke callbacks only if this is not a synchronous resolve
+        // (async resolves are shimmed as synchronous during SSR)
+        if (!sync) {
+          forceRender(true);
+        } else {
+          owners.length = 0;
+        }
+      });
+
+      var reject = once(function (reason) {
         warn(
-          'v-bind without argument expects an Object or Array value',
-          this
+          "Failed to resolve async component: " + (String(factory)) +
+          (reason ? ("\nReason: " + reason) : '')
         );
-      } else {
-        if (Array.isArray(value)) {
-          value = toObject(value);
+        if (isDef(factory.errorComp)) {
+          factory.error = true;
+          forceRender(true);
         }
-        var hash;
-        var loop = function ( key ) {
-          if (
-            key === 'class' ||
-            key === 'style' ||
-            isReservedAttribute(key)
-          ) {
-            hash = data;
-          } else {
-            var type = data.attrs && data.attrs.type;
-            hash = asProp || config.mustUseProp(tag, type, key)
-              ? data.domProps || (data.domProps = {})
-              : data.attrs || (data.attrs = {});
-          }
-          var camelizedKey = camelize(key);
-          if (!(key in hash) && !(camelizedKey in hash)) {
-            hash[key] = value[key];
-
-            if (isSync) {
-              var on = data.on || (data.on = {});
-              on[("update:" + camelizedKey)] = function ($event) {
-                value[key] = $event;
-              };
-            }
-          }
-        };
+      });
 
-        for (var key in value) loop( key );
-      }
-    }
-    return data
-  }
+      var res = factory(resolve, reject);
 
-  /*  */
+      if (isObject(res)) {
+        if (isPromise(res)) {
+          // () => Promise
+          if (isUndef(factory.resolved)) {
+            res.then(resolve, reject);
+          }
+        } else if (isPromise(res.component)) {
+          res.component.then(resolve, reject);
 
-  /**
-   * Runtime helper for rendering static trees.
-   */
-  function renderStatic (
-    index,
-    isInFor
-  ) {
-    var cached = this._staticTrees || (this._staticTrees = []);
-    var tree = cached[index];
-    // if has already-rendered static tree and not inside v-for,
-    // we can reuse the same tree.
-    if (tree && !isInFor) {
-      return tree
-    }
-    // otherwise, render a fresh tree.
-    tree = cached[index] = this.$options.staticRenderFns[index].call(
-      this._renderProxy,
-      null,
-      this // for render fns generated for functional component templates
-    );
-    markStatic(tree, ("__static__" + index), false);
-    return tree
-  }
+          if (isDef(res.error)) {
+            factory.errorComp = ensureCtor(res.error, baseCtor);
+          }
 
-  /**
-   * Runtime helper for v-once.
-   * Effectively it means marking the node as static with a unique key.
-   */
-  function markOnce (
-    tree,
-    index,
-    key
-  ) {
-    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-    return tree
-  }
+          if (isDef(res.loading)) {
+            factory.loadingComp = ensureCtor(res.loading, baseCtor);
+            if (res.delay === 0) {
+              factory.loading = true;
+            } else {
+              setTimeout(function () {
+                if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                  factory.loading = true;
+                  forceRender(false);
+                }
+              }, res.delay || 200);
+            }
+          }
 
-  function markStatic (
-    tree,
-    key,
-    isOnce
-  ) {
-    if (Array.isArray(tree)) {
-      for (var i = 0; i < tree.length; i++) {
-        if (tree[i] && typeof tree[i] !== 'string') {
-          markStaticNode(tree[i], (key + "_" + i), isOnce);
+          if (isDef(res.timeout)) {
+            setTimeout(function () {
+              if (isUndef(factory.resolved)) {
+                reject(
+                  "timeout (" + (res.timeout) + "ms)"
+                );
+              }
+            }, res.timeout);
+          }
         }
       }
-    } else {
-      markStaticNode(tree, key, isOnce);
+
+      sync = false;
+      // return in case resolved synchronously
+      return factory.loading
+        ? factory.loadingComp
+        : factory.resolved
     }
   }
 
-  function markStaticNode (node, key, isOnce) {
-    node.isStatic = true;
-    node.key = key;
-    node.isOnce = isOnce;
-  }
+  /*  */
 
   /*  */
 
-  function bindObjectListeners (data, value) {
-    if (value) {
-      if (!isPlainObject(value)) {
-        warn(
-          'v-on without argument expects an Object value',
-          this
-        );
-      } else {
-        var on = data.on = data.on ? extend({}, data.on) : {};
-        for (var key in value) {
-          var existing = on[key];
-          var ours = value[key];
-          on[key] = existing ? [].concat(existing, ours) : ours;
-        }
-      }
-    }
-    return data
-  }
+  /*  */
 
   /*  */
 
-  function bindDynamicKeys (baseObj, values) {
-    for (var i = 0; i < values.length; i += 2) {
-      var key = values[i];
-      if (typeof key === 'string' && key) {
-        baseObj[values[i]] = values[i + 1];
-      } else if (key !== '' && key !== null) {
-        // null is a speical value for explicitly removing a binding
-        warn(
-          ("Invalid value for dynamic directive argument (expected string or null): " + key),
-          this
-        );
+  var target;
+
+  function add (event, fn) {
+    target.$on(event, fn);
+  }
+
+  function remove$1 (event, fn) {
+    target.$off(event, fn);
+  }
+
+  function createOnceHandler (event, fn) {
+    var _target = target;
+    return function onceHandler () {
+      var res = fn.apply(null, arguments);
+      if (res !== null) {
+        _target.$off(event, onceHandler);
       }
     }
-    return baseObj
   }
 
-  // helper to dynamically append modifier runtime markers to event names.
-  // ensure only append when value is already string, otherwise it will be cast
-  // to string and cause the type check to miss.
-  function prependModifier (value, symbol) {
-    return typeof value === 'string' ? symbol + value : value
+  function updateComponentListeners (
+    vm,
+    listeners,
+    oldListeners
+  ) {
+    target = vm;
+    updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+    target = undefined;
   }
 
   /*  */
 
-  function installRenderHelpers (target) {
-    target._o = markOnce;
-    target._n = toNumber;
-    target._s = toString;
-    target._l = renderList;
-    target._t = renderSlot;
-    target._q = looseEqual;
-    target._i = looseIndexOf;
-    target._m = renderStatic;
-    target._f = resolveFilter;
-    target._k = checkKeyCodes;
-    target._b = bindObjectProps;
-    target._v = createTextVNode;
-    target._e = createEmptyVNode;
-    target._u = resolveScopedSlots;
-    target._g = bindObjectListeners;
-    target._d = bindDynamicKeys;
-    target._p = prependModifier;
+  var activeInstance = null;
+
+  function updateChildComponent (
+    vm,
+    propsData,
+    listeners,
+    parentVnode,
+    renderChildren
+  ) {
+
+    // determine whether component has slot children
+    // we need to do this before overwriting $options._renderChildren.
+
+    // check if there are dynamic scopedSlots (hand-written or compiled but with
+    // dynamic slot names). Static scoped slots compiled from template has the
+    // "$stable" marker.
+    var hasDynamicScopedSlot = !!(
+      (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+      (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+    );
+
+    // Any static slot children from the parent may have changed during parent's
+    // update. Dynamic scoped slots may also have changed. In such cases, a forced
+    // update is necessary to ensure correctness.
+    var needsForceUpdate = !!(
+      renderChildren ||               // has new static slots
+      vm.$options._renderChildren ||  // has old static slots
+      hasDynamicScopedSlot
+    );
+
+    vm.$options._parentVnode = parentVnode;
+    vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+
+    if (vm._vnode) { // update child tree's parent
+      vm._vnode.parent = parentVnode;
+    }
+    vm.$options._renderChildren = renderChildren;
+
+    // update $attrs and $listeners hash
+    // these are also reactive so they may trigger child update if the child
+    // used them during render
+    vm.$attrs = parentVnode.data.attrs || emptyObject;
+    vm.$listeners = listeners || emptyObject;
+
+    // update props
+    if (propsData && vm.$options.props) {
+      toggleObserving(false);
+      var props = vm._props;
+      var propKeys = vm.$options._propKeys || [];
+      for (var i = 0; i < propKeys.length; i++) {
+        var key = propKeys[i];
+        var propOptions = vm.$options.props; // wtf flow?
+        props[key] = validateProp(key, propOptions, propsData, vm);
+      }
+      toggleObserving(true);
+      // keep a copy of raw propsData
+      vm.$options.propsData = propsData;
+    }
+
+    // update listeners
+    listeners = listeners || emptyObject;
+    var oldListeners = vm.$options._parentListeners;
+    vm.$options._parentListeners = listeners;
+    updateComponentListeners(vm, listeners, oldListeners);
+
+    // resolve slots + force update if has children
+    if (needsForceUpdate) {
+      vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+      vm.$forceUpdate();
+    }
   }
 
-  /*  */
+  function isInInactiveTree (vm) {
+    while (vm && (vm = vm.$parent)) {
+      if (vm._inactive) { return true }
+    }
+    return false
+  }
 
-  function normalizeScopedSlots (
-    slots,
-    normalSlots
-  ) {
-    var res;
-    if (!slots) {
-      res = {};
-    } else if (slots._normalized) {
-      return slots
-    } else {
-      res = {};
-      for (var key in slots) {
-        if (slots[key] && key[0] !== '$') {
-          res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-        }
+  function activateChildComponent (vm, direct) {
+    if (direct) {
+      vm._directInactive = false;
+      if (isInInactiveTree(vm)) {
+        return
       }
+    } else if (vm._directInactive) {
+      return
     }
-    // expose normal slots on scopedSlots
-    for (var key$1 in normalSlots) {
-      if (!(key$1 in res)) {
-        res[key$1] = proxyNormalSlot(normalSlots, key$1);
+    if (vm._inactive || vm._inactive === null) {
+      vm._inactive = false;
+      for (var i = 0; i < vm.$children.length; i++) {
+        activateChildComponent(vm.$children[i]);
       }
+      callHook(vm, 'activated');
     }
-    res._normalized = true;
-    res.$stable = slots ? slots.$stable : true;
-    return res
   }
 
-  function normalizeScopedSlot(normalSlots, key, fn) {
-    var normalized = function (scope) {
-      if ( scope === void 0 ) scope = {};
+  function deactivateChildComponent (vm, direct) {
+    if (direct) {
+      vm._directInactive = true;
+      if (isInInactiveTree(vm)) {
+        return
+      }
+    }
+    if (!vm._inactive) {
+      vm._inactive = true;
+      for (var i = 0; i < vm.$children.length; i++) {
+        deactivateChildComponent(vm.$children[i]);
+      }
+      callHook(vm, 'deactivated');
+    }
+  }
 
-      var res = fn(scope);
-      return res && typeof res === 'object' && !Array.isArray(res)
-        ? [res] // single vnode
-        : normalizeChildren(res)
-    };
-    // proxy scoped slots on normal $slots
-    if (!hasOwn(normalSlots, key)) {
-      Object.defineProperty(normalSlots, key, {
-        get: normalized
-      });
+  function callHook (vm, hook) {
+    // #7573 disable dep collection when invoking lifecycle hooks
+    pushTarget();
+    var handlers = vm.$options[hook];
+    var info = hook + " hook";
+    if (handlers) {
+      for (var i = 0, j = handlers.length; i < j; i++) {
+        invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+      }
+    }
+    if (vm._hasHookEvent) {
+      vm.$emit('hook:' + hook);
     }
-    return normalized
+    popTarget();
   }
 
-  function proxyNormalSlot(slots, key) {
-    return function () { return slots[key]; }
+  /*  */
+
+  // Async edge case fix requires storing an event listener's attach timestamp.
+  var getNow = Date.now;
+
+  // Determine what event timestamp the browser is using. Annoyingly, the
+  // timestamp can either be hi-res (relative to page load) or low-res
+  // (relative to UNIX epoch), so in order to compare time we have to use the
+  // same timestamp type when saving the flush timestamp.
+  if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+    // if the low-res timestamp which is bigger than the event timestamp
+    // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+    // and we need to use the hi-res version for event listeners as well.
+    getNow = function () { return performance.now(); };
+  }
+
+  /**
+   * Queue a kept-alive component that was activated during patch.
+   * The queue will be processed after the entire tree has been patched.
+   */
+  function queueActivatedComponent (vm) {
+    // setting _inactive to false here so that a render function can
+    // rely on checking whether it's in an inactive tree (e.g. router-view)
+    vm._inactive = false;
   }
 
   /*  */
 
   /*  */
 
+  /*  */
+
   function resolveInject (inject, vm) {
     if (inject) {
       // inject is :any because flow is not smart enough to figure out cached
@@ -8151,7 +8183,7 @@
     var asyncFactory;
     if (isUndef(Ctor.cid)) {
       asyncFactory = Ctor;
-      Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
+      Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
       if (Ctor === undefined) {
         // return a placeholder node for async component, which is rendered
         // as a comment node but preserves all the raw information for the node.
diff --git a/packages/vue-server-renderer/build.dev.js b/packages/vue-server-renderer/build.dev.js
index a672e4a6ca3..cfde803378a 100644
--- a/packages/vue-server-renderer/build.dev.js
+++ b/packages/vue-server-renderer/build.dev.js
@@ -696,6 +696,7 @@ var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android'
 var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
 var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 var isPhantomJS = UA && /phantomjs/.test(UA);
+var isFF = UA && UA.match(/firefox\/(\d+)/);
 
 // Firefox has a "watch" function on Object.prototype...
 var nativeWatch = ({}).watch;
@@ -3564,6 +3565,8 @@ var invalidAttributeRE = /[\s"'<>\/=]/;
 
 var decodeHTMLCached = cached(he.decode);
 
+var emptySlotScopeToken = "_empty_";
+
 // configurable state
 var warn$1;
 var delimiters;
@@ -4176,7 +4179,7 @@ function processSlotContent (el) {
         var dynamic = ref.dynamic;
         el.slotTarget = name;
         el.slotTargetDynamic = dynamic;
-        el.slotScope = slotBinding.value || "_"; // force it into a scoped slot for perf
+        el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
       }
     } else {
       // v-slot on component, denotes default slot
@@ -4211,8 +4214,13 @@ function processSlotContent (el) {
         var slotContainer = slots[name$1] = createASTElement('template', [], el);
         slotContainer.slotTarget = name$1;
         slotContainer.slotTargetDynamic = dynamic$1;
-        slotContainer.children = el.children.filter(function (c) { return !(c).slotScope; });
-        slotContainer.slotScope = slotBinding$1.value || "_";
+        slotContainer.children = el.children.filter(function (c) {
+          if (!c.slotScope) {
+            c.parent = slotContainer;
+            return true
+          }
+        });
+        slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
         // remove children as they are returned from scopedSlots now
         el.children = [];
         // mark el non-plain so data gets generated
@@ -5180,7 +5188,7 @@ function genData$2 (el, state) {
   }
   // scoped slots
   if (el.scopedSlots) {
-    data += (genScopedSlots(el.scopedSlots, state)) + ",";
+    data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
   }
   // component v-model
   if (el.model) {
@@ -5251,16 +5259,34 @@ function genInlineTemplate (el, state) {
 }
 
 function genScopedSlots (
+  el,
   slots,
   state
 ) {
-  var hasDynamicKeys = Object.keys(slots).some(function (key) {
+  // by default scoped slots are considered "stable", this allows child
+  // components with only scoped slots to skip forced updates from parent.
+  // but in some cases we have to bail-out of this optimization
+  // for example if the slot contains dynamic names, has v-if or v-for on them...
+  var needsForceUpdate = Object.keys(slots).some(function (key) {
     var slot = slots[key];
     return slot.slotTargetDynamic || slot.if || slot.for
   });
+  // OR when it is inside another scoped slot (the reactivity is disconnected)
+  // #9438
+  if (!needsForceUpdate) {
+    var parent = el.parent;
+    while (parent) {
+      if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+        needsForceUpdate = true;
+        break
+      }
+      parent = parent.parent;
+    }
+  }
+
   return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
       return genScopedSlot(slots[key], state)
-    }).join(',')) + "]" + (hasDynamicKeys ? ",true" : "") + ")")
+    }).join(',')) + "]" + (needsForceUpdate ? ",true" : "") + ")")
 }
 
 function genScopedSlot (
@@ -5274,7 +5300,10 @@ function genScopedSlot (
   if (el.for && !el.forProcessed) {
     return genFor(el, state, genScopedSlot)
   }
-  var fn = "function(" + (String(el.slotScope)) + "){" +
+  var slotScope = el.slotScope === emptySlotScopeToken
+    ? ""
+    : String(el.slotScope);
+  var fn = "function(" + slotScope + "){" +
     "return " + (el.tag === 'template'
       ? el.if && isLegacySyntax
         ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
@@ -5367,7 +5396,14 @@ function genSlot (el, state) {
   var slotName = el.slotName || '"default"';
   var children = genChildren(el, state);
   var res = "_t(" + slotName + (children ? ("," + children) : '');
-  var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
+  var attrs = el.attrs || el.dynamicAttrs
+    ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+        // slot props are camelized
+        name: camelize(attr.name),
+        value: attr.value,
+        dynamic: attr.dynamic
+      }); }))
+    : null;
   var bind$$1 = el.attrsMap['v-bind'];
   if ((attrs || bind$$1) && !children) {
     res += ",null";
@@ -6695,900 +6731,896 @@ function checkProp (
 
 /*  */
 
-function ensureCtor (comp, base) {
-  if (
-    comp.__esModule ||
-    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
-  ) {
-    comp = comp.default;
-  }
-  return isObject(comp)
-    ? base.extend(comp)
-    : comp
-}
+var SIMPLE_NORMALIZE = 1;
+var ALWAYS_NORMALIZE = 2;
 
-function createAsyncPlaceholder (
-  factory,
-  data,
+// wrapper function for providing a more flexible interface
+// without getting yelled at by flow
+function createElement (
   context,
+  tag,
+  data,
   children,
-  tag
+  normalizationType,
+  alwaysNormalize
 ) {
-  var node = createEmptyVNode();
-  node.asyncFactory = factory;
-  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
-  return node
+  if (Array.isArray(data) || isPrimitive(data)) {
+    normalizationType = children;
+    children = data;
+    data = undefined;
+  }
+  if (isTrue(alwaysNormalize)) {
+    normalizationType = ALWAYS_NORMALIZE;
+  }
+  return _createElement(context, tag, data, children, normalizationType)
 }
 
-function resolveAsyncComponent (
-  factory,
-  baseCtor,
-  context
+function _createElement (
+  context,
+  tag,
+  data,
+  children,
+  normalizationType
 ) {
-  if (isTrue(factory.error) && isDef(factory.errorComp)) {
-    return factory.errorComp
+  if (isDef(data) && isDef((data).__ob__)) {
+    warn(
+      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
+      'Always create fresh vnode data objects in each render!',
+      context
+    );
+    return createEmptyVNode()
   }
-
-  if (isDef(factory.resolved)) {
-    return factory.resolved
+  // object syntax in v-bind
+  if (isDef(data) && isDef(data.is)) {
+    tag = data.is;
   }
-
-  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
-    return factory.loadingComp
+  if (!tag) {
+    // in case of component :is set to falsy value
+    return createEmptyVNode()
   }
-
-  if (isDef(factory.contexts)) {
-    // already pending
-    factory.contexts.push(context);
-  } else {
-    var contexts = factory.contexts = [context];
-    var sync = true;
-
-    var forceRender = function (renderCompleted) {
-      for (var i = 0, l = contexts.length; i < l; i++) {
-        contexts[i].$forceUpdate();
-      }
-
-      if (renderCompleted) {
-        contexts.length = 0;
-      }
-    };
-
-    var resolve = once(function (res) {
-      // cache resolved
-      factory.resolved = ensureCtor(res, baseCtor);
-      // invoke callbacks only if this is not a synchronous resolve
-      // (async resolves are shimmed as synchronous during SSR)
-      if (!sync) {
-        forceRender(true);
-      } else {
-        contexts.length = 0;
-      }
-    });
-
-    var reject = once(function (reason) {
+  // warn against non-primitive key
+  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
+  ) {
+    {
       warn(
-        "Failed to resolve async component: " + (String(factory)) +
-        (reason ? ("\nReason: " + reason) : '')
+        'Avoid using non-primitive value as key, ' +
+        'use string/number value instead.',
+        context
       );
-      if (isDef(factory.errorComp)) {
-        factory.error = true;
-        forceRender(true);
-      }
-    });
-
-    var res = factory(resolve, reject);
-
-    if (isObject(res)) {
-      if (isPromise(res)) {
-        // () => Promise
-        if (isUndef(factory.resolved)) {
-          res.then(resolve, reject);
-        }
-      } else if (isPromise(res.component)) {
-        res.component.then(resolve, reject);
-
-        if (isDef(res.error)) {
-          factory.errorComp = ensureCtor(res.error, baseCtor);
-        }
-
-        if (isDef(res.loading)) {
-          factory.loadingComp = ensureCtor(res.loading, baseCtor);
-          if (res.delay === 0) {
-            factory.loading = true;
-          } else {
-            setTimeout(function () {
-              if (isUndef(factory.resolved) && isUndef(factory.error)) {
-                factory.loading = true;
-                forceRender(false);
-              }
-            }, res.delay || 200);
-          }
-        }
-
-        if (isDef(res.timeout)) {
-          setTimeout(function () {
-            if (isUndef(factory.resolved)) {
-              reject(
-                "timeout (" + (res.timeout) + "ms)"
-              );
-            }
-          }, res.timeout);
-        }
-      }
     }
-
-    sync = false;
-    // return in case resolved synchronously
-    return factory.loading
-      ? factory.loadingComp
-      : factory.resolved
+  }
+  // support single function children as default scoped slot
+  if (Array.isArray(children) &&
+    typeof children[0] === 'function'
+  ) {
+    data = data || {};
+    data.scopedSlots = { default: children[0] };
+    children.length = 0;
+  }
+  if (normalizationType === ALWAYS_NORMALIZE) {
+    children = normalizeChildren(children);
+  } else if (normalizationType === SIMPLE_NORMALIZE) {
+    children = simpleNormalizeChildren(children);
+  }
+  var vnode, ns;
+  if (typeof tag === 'string') {
+    var Ctor;
+    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
+    if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
+      // component
+      vnode = createComponent(Ctor, data, context, children, tag);
+    } else {
+      // unknown or unlisted namespaced elements
+      // check at runtime because it may get assigned a namespace when its
+      // parent normalizes children
+      vnode = new VNode(
+        tag, data, children,
+        undefined, undefined, context
+      );
+    }
+  } else {
+    // direct component options / constructor
+    vnode = createComponent(tag, data, context, children);
+  }
+  if (Array.isArray(vnode)) {
+    return vnode
+  } else if (isDef(vnode)) {
+    if (isDef(ns)) { applyNS(vnode, ns); }
+    if (isDef(data)) { registerDeepBindings(data); }
+    return vnode
+  } else {
+    return createEmptyVNode()
   }
 }
 
-/*  */
-
-/*  */
-
-/*  */
-
-/*  */
-
-var target;
-
-function add (event, fn) {
-  target.$on(event, fn);
-}
-
-function remove$1 (event, fn) {
-  target.$off(event, fn);
+function applyNS (vnode, ns, force) {
+  vnode.ns = ns;
+  if (vnode.tag === 'foreignObject') {
+    // use default namespace inside foreignObject
+    ns = undefined;
+    force = true;
+  }
+  if (isDef(vnode.children)) {
+    for (var i = 0, l = vnode.children.length; i < l; i++) {
+      var child = vnode.children[i];
+      if (isDef(child.tag) && (
+        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
+        applyNS(child, ns, force);
+      }
+    }
+  }
 }
 
-function createOnceHandler (event, fn) {
-  var _target = target;
-  return function onceHandler () {
-    var res = fn.apply(null, arguments);
-    if (res !== null) {
-      _target.$off(event, onceHandler);
-    }
+// ref #5318
+// necessary to ensure parent re-render when deep bindings like :style and
+// :class are used on slot nodes
+function registerDeepBindings (data) {
+  if (isObject(data.style)) {
+    traverse(data.style);
+  }
+  if (isObject(data.class)) {
+    traverse(data.class);
   }
 }
 
-function updateComponentListeners (
-  vm,
-  listeners,
-  oldListeners
-) {
-  target = vm;
-  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
-  target = undefined;
-}
-
 /*  */
 
-
-
 /**
- * Runtime helper for resolving raw children VNodes into a slot object.
+ * Runtime helper for rendering v-for lists.
  */
-function resolveSlots (
-  children,
-  context
+function renderList (
+  val,
+  render
 ) {
-  if (!children || !children.length) {
-    return {}
-  }
-  var slots = {};
-  for (var i = 0, l = children.length; i < l; i++) {
-    var child = children[i];
-    var data = child.data;
-    // remove slot attribute if the node is resolved as a Vue slot node
-    if (data && data.attrs && data.attrs.slot) {
-      delete data.attrs.slot;
+  var ret, i, l, keys, key;
+  if (Array.isArray(val) || typeof val === 'string') {
+    ret = new Array(val.length);
+    for (i = 0, l = val.length; i < l; i++) {
+      ret[i] = render(val[i], i);
     }
-    // named slots should only be respected if the vnode was rendered in the
-    // same context.
-    if ((child.context === context || child.fnContext === context) &&
-      data && data.slot != null
-    ) {
-      var name = data.slot;
-      var slot = (slots[name] || (slots[name] = []));
-      if (child.tag === 'template') {
-        slot.push.apply(slot, child.children || []);
-      } else {
-        slot.push(child);
+  } else if (typeof val === 'number') {
+    ret = new Array(val);
+    for (i = 0; i < val; i++) {
+      ret[i] = render(i + 1, i);
+    }
+  } else if (isObject(val)) {
+    if (hasSymbol && val[Symbol.iterator]) {
+      ret = [];
+      var iterator = val[Symbol.iterator]();
+      var result = iterator.next();
+      while (!result.done) {
+        ret.push(render(result.value, ret.length));
+        result = iterator.next();
       }
     } else {
-      (slots.default || (slots.default = [])).push(child);
+      keys = Object.keys(val);
+      ret = new Array(keys.length);
+      for (i = 0, l = keys.length; i < l; i++) {
+        key = keys[i];
+        ret[i] = render(val[key], key, i);
+      }
     }
   }
-  // ignore slots that contains only whitespace
-  for (var name$1 in slots) {
-    if (slots[name$1].every(isWhitespace)) {
-      delete slots[name$1];
-    }
+  if (!isDef(ret)) {
+    ret = [];
   }
-  return slots
+  (ret)._isVList = true;
+  return ret
 }
 
-function isWhitespace (node) {
-  return (node.isComment && !node.asyncFactory) || node.text === ' '
-}
+/*  */
 
-function resolveScopedSlots (
-  fns, // see flow/vnode
-  hasDynamicKeys,
-  res
+/**
+ * Runtime helper for rendering <slot>
+ */
+function renderSlot (
+  name,
+  fallback,
+  props,
+  bindObject
 ) {
-  res = res || { $stable: !hasDynamicKeys };
-  for (var i = 0; i < fns.length; i++) {
-    var slot = fns[i];
-    if (Array.isArray(slot)) {
-      resolveScopedSlots(slot, hasDynamicKeys, res);
-    } else if (slot) {
-      res[slot.key] = slot.fn;
+  var scopedSlotFn = this.$scopedSlots[name];
+  var nodes;
+  if (scopedSlotFn) { // scoped slot
+    props = props || {};
+    if (bindObject) {
+      if (!isObject(bindObject)) {
+        warn(
+          'slot v-bind without argument expects an Object',
+          this
+        );
+      }
+      props = extend(extend({}, bindObject), props);
     }
+    nodes = scopedSlotFn(props) || fallback;
+  } else {
+    nodes = this.$slots[name] || fallback;
+  }
+
+  var target = props && props.slot;
+  if (target) {
+    return this.$createElement('template', { slot: target }, nodes)
+  } else {
+    return nodes
   }
-  return res
 }
 
 /*  */
 
-var activeInstance = null;
+/**
+ * Runtime helper for resolving filters
+ */
+function resolveFilter (id) {
+  return resolveAsset(this.$options, 'filters', id, true) || identity
+}
 
-function updateChildComponent (
-  vm,
-  propsData,
-  listeners,
-  parentVnode,
-  renderChildren
-) {
+/*  */
 
-  // determine whether component has slot children
-  // we need to do this before overwriting $options._renderChildren.
+function isKeyNotMatch (expect, actual) {
+  if (Array.isArray(expect)) {
+    return expect.indexOf(actual) === -1
+  } else {
+    return expect !== actual
+  }
+}
 
-  // check if there are dynamic scopedSlots (hand-written or compiled but with
-  // dynamic slot names). Static scoped slots compiled from template has the
-  // "$stable" marker.
-  var hasDynamicScopedSlot = !!(
-    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
-    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
-  );
-  // Any static slot children from the parent may have changed during parent's
-  // update. Dynamic scoped slots may also have changed. In such cases, a forced
-  // update is necessary to ensure correctness.
-  var needsForceUpdate = !!(
-    renderChildren ||               // has new static slots
-    vm.$options._renderChildren ||  // has old static slots
-    hasDynamicScopedSlot
-  );
+/**
+ * Runtime helper for checking keyCodes from config.
+ * exposed as Vue.prototype._k
+ * passing in eventKeyName as last argument separately for backwards compat
+ */
+function checkKeyCodes (
+  eventKeyCode,
+  key,
+  builtInKeyCode,
+  eventKeyName,
+  builtInKeyName
+) {
+  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
+  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
+    return isKeyNotMatch(builtInKeyName, eventKeyName)
+  } else if (mappedKeyCode) {
+    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
+  } else if (eventKeyName) {
+    return hyphenate(eventKeyName) !== key
+  }
+}
 
-  vm.$options._parentVnode = parentVnode;
-  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+/*  */
 
-  if (vm._vnode) { // update child tree's parent
-    vm._vnode.parent = parentVnode;
-  }
-  vm.$options._renderChildren = renderChildren;
+/**
+ * Runtime helper for merging v-bind="object" into a VNode's data.
+ */
+function bindObjectProps (
+  data,
+  tag,
+  value,
+  asProp,
+  isSync
+) {
+  if (value) {
+    if (!isObject(value)) {
+      warn(
+        'v-bind without argument expects an Object or Array value',
+        this
+      );
+    } else {
+      if (Array.isArray(value)) {
+        value = toObject(value);
+      }
+      var hash;
+      var loop = function ( key ) {
+        if (
+          key === 'class' ||
+          key === 'style' ||
+          isReservedAttribute(key)
+        ) {
+          hash = data;
+        } else {
+          var type = data.attrs && data.attrs.type;
+          hash = asProp || config.mustUseProp(tag, type, key)
+            ? data.domProps || (data.domProps = {})
+            : data.attrs || (data.attrs = {});
+        }
+        var camelizedKey = camelize(key);
+        if (!(key in hash) && !(camelizedKey in hash)) {
+          hash[key] = value[key];
 
-  // update $attrs and $listeners hash
-  // these are also reactive so they may trigger child update if the child
-  // used them during render
-  vm.$attrs = parentVnode.data.attrs || emptyObject;
-  vm.$listeners = listeners || emptyObject;
+          if (isSync) {
+            var on = data.on || (data.on = {});
+            on[("update:" + camelizedKey)] = function ($event) {
+              value[key] = $event;
+            };
+          }
+        }
+      };
 
-  // update props
-  if (propsData && vm.$options.props) {
-    toggleObserving(false);
-    var props = vm._props;
-    var propKeys = vm.$options._propKeys || [];
-    for (var i = 0; i < propKeys.length; i++) {
-      var key = propKeys[i];
-      var propOptions = vm.$options.props; // wtf flow?
-      props[key] = validateProp(key, propOptions, propsData, vm);
+      for (var key in value) loop( key );
     }
-    toggleObserving(true);
-    // keep a copy of raw propsData
-    vm.$options.propsData = propsData;
   }
+  return data
+}
 
-  // update listeners
-  listeners = listeners || emptyObject;
-  var oldListeners = vm.$options._parentListeners;
-  vm.$options._parentListeners = listeners;
-  updateComponentListeners(vm, listeners, oldListeners);
+/*  */
 
-  // resolve slots + force update if has children
-  if (needsForceUpdate) {
-    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
-    vm.$forceUpdate();
+/**
+ * Runtime helper for rendering static trees.
+ */
+function renderStatic (
+  index,
+  isInFor
+) {
+  var cached = this._staticTrees || (this._staticTrees = []);
+  var tree = cached[index];
+  // if has already-rendered static tree and not inside v-for,
+  // we can reuse the same tree.
+  if (tree && !isInFor) {
+    return tree
   }
+  // otherwise, render a fresh tree.
+  tree = cached[index] = this.$options.staticRenderFns[index].call(
+    this._renderProxy,
+    null,
+    this // for render fns generated for functional component templates
+  );
+  markStatic(tree, ("__static__" + index), false);
+  return tree
 }
 
-function isInInactiveTree (vm) {
-  while (vm && (vm = vm.$parent)) {
-    if (vm._inactive) { return true }
-  }
-  return false
+/**
+ * Runtime helper for v-once.
+ * Effectively it means marking the node as static with a unique key.
+ */
+function markOnce (
+  tree,
+  index,
+  key
+) {
+  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
+  return tree
 }
 
-function activateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = false;
-    if (isInInactiveTree(vm)) {
-      return
-    }
-  } else if (vm._directInactive) {
-    return
-  }
-  if (vm._inactive || vm._inactive === null) {
-    vm._inactive = false;
-    for (var i = 0; i < vm.$children.length; i++) {
-      activateChildComponent(vm.$children[i]);
+function markStatic (
+  tree,
+  key,
+  isOnce
+) {
+  if (Array.isArray(tree)) {
+    for (var i = 0; i < tree.length; i++) {
+      if (tree[i] && typeof tree[i] !== 'string') {
+        markStaticNode(tree[i], (key + "_" + i), isOnce);
+      }
     }
-    callHook(vm, 'activated');
+  } else {
+    markStaticNode(tree, key, isOnce);
   }
 }
 
-function deactivateChildComponent (vm, direct) {
-  if (direct) {
-    vm._directInactive = true;
-    if (isInInactiveTree(vm)) {
-      return
-    }
-  }
-  if (!vm._inactive) {
-    vm._inactive = true;
-    for (var i = 0; i < vm.$children.length; i++) {
-      deactivateChildComponent(vm.$children[i]);
+function markStaticNode (node, key, isOnce) {
+  node.isStatic = true;
+  node.key = key;
+  node.isOnce = isOnce;
+}
+
+/*  */
+
+function bindObjectListeners (data, value) {
+  if (value) {
+    if (!isPlainObject(value)) {
+      warn(
+        'v-on without argument expects an Object value',
+        this
+      );
+    } else {
+      var on = data.on = data.on ? extend({}, data.on) : {};
+      for (var key in value) {
+        var existing = on[key];
+        var ours = value[key];
+        on[key] = existing ? [].concat(existing, ours) : ours;
+      }
     }
-    callHook(vm, 'deactivated');
   }
+  return data
 }
 
-function callHook (vm, hook) {
-  // #7573 disable dep collection when invoking lifecycle hooks
-  pushTarget();
-  var handlers = vm.$options[hook];
-  var info = hook + " hook";
-  if (handlers) {
-    for (var i = 0, j = handlers.length; i < j; i++) {
-      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+/*  */
+
+function resolveScopedSlots (
+  fns, // see flow/vnode
+  hasDynamicKeys,
+  res
+) {
+  res = res || { $stable: !hasDynamicKeys };
+  for (var i = 0; i < fns.length; i++) {
+    var slot = fns[i];
+    if (Array.isArray(slot)) {
+      resolveScopedSlots(slot, hasDynamicKeys, res);
+    } else if (slot) {
+      res[slot.key] = slot.fn;
     }
   }
-  if (vm._hasHookEvent) {
-    vm.$emit('hook:' + hook);
-  }
-  popTarget();
+  return res
 }
 
 /*  */
 
-// Async edge case fix requires storing an event listener's attach timestamp.
-var getNow = Date.now;
-
-// Determine what event timestamp the browser is using. Annoyingly, the
-// timestamp can either be hi-res ( relative to poge load) or low-res
-// (relative to UNIX epoch), so in order to compare time we have to use the
-// same timestamp type when saving the flush timestamp.
-if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
-  // if the low-res timestamp which is bigger than the event timestamp
-  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
-  // and we need to use the hi-res version for event listeners as well.
-  getNow = function () { return performance.now(); };
+function bindDynamicKeys (baseObj, values) {
+  for (var i = 0; i < values.length; i += 2) {
+    var key = values[i];
+    if (typeof key === 'string' && key) {
+      baseObj[values[i]] = values[i + 1];
+    } else if (key !== '' && key !== null) {
+      // null is a speical value for explicitly removing a binding
+      warn(
+        ("Invalid value for dynamic directive argument (expected string or null): " + key),
+        this
+      );
+    }
+  }
+  return baseObj
 }
 
-/**
- * Queue a kept-alive component that was activated during patch.
- * The queue will be processed after the entire tree has been patched.
- */
-function queueActivatedComponent (vm) {
-  // setting _inactive to false here so that a render function can
-  // rely on checking whether it's in an inactive tree (e.g. router-view)
-  vm._inactive = false;
+// helper to dynamically append modifier runtime markers to event names.
+// ensure only append when value is already string, otherwise it will be cast
+// to string and cause the type check to miss.
+function prependModifier (value, symbol) {
+  return typeof value === 'string' ? symbol + value : value
 }
 
 /*  */
 
-/*  */
+function installRenderHelpers (target) {
+  target._o = markOnce;
+  target._n = toNumber;
+  target._s = toString;
+  target._l = renderList;
+  target._t = renderSlot;
+  target._q = looseEqual;
+  target._i = looseIndexOf;
+  target._m = renderStatic;
+  target._f = resolveFilter;
+  target._k = checkKeyCodes;
+  target._b = bindObjectProps;
+  target._v = createTextVNode;
+  target._e = createEmptyVNode;
+  target._u = resolveScopedSlots;
+  target._g = bindObjectListeners;
+  target._d = bindDynamicKeys;
+  target._p = prependModifier;
+}
 
 /*  */
 
-var SIMPLE_NORMALIZE = 1;
-var ALWAYS_NORMALIZE = 2;
 
-// wrapper function for providing a more flexible interface
-// without getting yelled at by flow
-function createElement (
-  context,
-  tag,
-  data,
+
+/**
+ * Runtime helper for resolving raw children VNodes into a slot object.
+ */
+function resolveSlots (
   children,
-  normalizationType,
-  alwaysNormalize
+  context
 ) {
-  if (Array.isArray(data) || isPrimitive(data)) {
-    normalizationType = children;
-    children = data;
-    data = undefined;
+  if (!children || !children.length) {
+    return {}
   }
-  if (isTrue(alwaysNormalize)) {
-    normalizationType = ALWAYS_NORMALIZE;
+  var slots = {};
+  for (var i = 0, l = children.length; i < l; i++) {
+    var child = children[i];
+    var data = child.data;
+    // remove slot attribute if the node is resolved as a Vue slot node
+    if (data && data.attrs && data.attrs.slot) {
+      delete data.attrs.slot;
+    }
+    // named slots should only be respected if the vnode was rendered in the
+    // same context.
+    if ((child.context === context || child.fnContext === context) &&
+      data && data.slot != null
+    ) {
+      var name = data.slot;
+      var slot = (slots[name] || (slots[name] = []));
+      if (child.tag === 'template') {
+        slot.push.apply(slot, child.children || []);
+      } else {
+        slot.push(child);
+      }
+    } else {
+      (slots.default || (slots.default = [])).push(child);
+    }
   }
-  return _createElement(context, tag, data, children, normalizationType)
+  // ignore slots that contains only whitespace
+  for (var name$1 in slots) {
+    if (slots[name$1].every(isWhitespace)) {
+      delete slots[name$1];
+    }
+  }
+  return slots
 }
 
-function _createElement (
-  context,
-  tag,
-  data,
-  children,
-  normalizationType
-) {
-  if (isDef(data) && isDef((data).__ob__)) {
-    warn(
-      "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
-      'Always create fresh vnode data objects in each render!',
-      context
-    );
-    return createEmptyVNode()
-  }
-  // object syntax in v-bind
-  if (isDef(data) && isDef(data.is)) {
-    tag = data.is;
-  }
-  if (!tag) {
-    // in case of component :is set to falsy value
-    return createEmptyVNode()
-  }
-  // warn against non-primitive key
-  if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)
-  ) {
-    {
-      warn(
-        'Avoid using non-primitive value as key, ' +
-        'use string/number value instead.',
-        context
-      );
-    }
-  }
-  // support single function children as default scoped slot
-  if (Array.isArray(children) &&
-    typeof children[0] === 'function'
-  ) {
-    data = data || {};
-    data.scopedSlots = { default: children[0] };
-    children.length = 0;
-  }
-  if (normalizationType === ALWAYS_NORMALIZE) {
-    children = normalizeChildren(children);
-  } else if (normalizationType === SIMPLE_NORMALIZE) {
-    children = simpleNormalizeChildren(children);
-  }
-  var vnode, ns;
-  if (typeof tag === 'string') {
-    var Ctor;
-    ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
-    if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
-      // component
-      vnode = createComponent(Ctor, data, context, children, tag);
-    } else {
-      // unknown or unlisted namespaced elements
-      // check at runtime because it may get assigned a namespace when its
-      // parent normalizes children
-      vnode = new VNode(
-        tag, data, children,
-        undefined, undefined, context
-      );
-    }
-  } else {
-    // direct component options / constructor
-    vnode = createComponent(tag, data, context, children);
-  }
-  if (Array.isArray(vnode)) {
-    return vnode
-  } else if (isDef(vnode)) {
-    if (isDef(ns)) { applyNS(vnode, ns); }
-    if (isDef(data)) { registerDeepBindings(data); }
-    return vnode
-  } else {
-    return createEmptyVNode()
-  }
-}
-
-function applyNS (vnode, ns, force) {
-  vnode.ns = ns;
-  if (vnode.tag === 'foreignObject') {
-    // use default namespace inside foreignObject
-    ns = undefined;
-    force = true;
-  }
-  if (isDef(vnode.children)) {
-    for (var i = 0, l = vnode.children.length; i < l; i++) {
-      var child = vnode.children[i];
-      if (isDef(child.tag) && (
-        isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
-        applyNS(child, ns, force);
-      }
-    }
-  }
-}
-
-// ref #5318
-// necessary to ensure parent re-render when deep bindings like :style and
-// :class are used on slot nodes
-function registerDeepBindings (data) {
-  if (isObject(data.style)) {
-    traverse(data.style);
-  }
-  if (isObject(data.class)) {
-    traverse(data.class);
-  }
+function isWhitespace (node) {
+  return (node.isComment && !node.asyncFactory) || node.text === ' '
 }
 
 /*  */
 
-/**
- * Runtime helper for rendering v-for lists.
- */
-function renderList (
-  val,
-  render
+function normalizeScopedSlots (
+  slots,
+  normalSlots
 ) {
-  var ret, i, l, keys, key;
-  if (Array.isArray(val) || typeof val === 'string') {
-    ret = new Array(val.length);
-    for (i = 0, l = val.length; i < l; i++) {
-      ret[i] = render(val[i], i);
-    }
-  } else if (typeof val === 'number') {
-    ret = new Array(val);
-    for (i = 0; i < val; i++) {
-      ret[i] = render(i + 1, i);
-    }
-  } else if (isObject(val)) {
-    if (hasSymbol && val[Symbol.iterator]) {
-      ret = [];
-      var iterator = val[Symbol.iterator]();
-      var result = iterator.next();
-      while (!result.done) {
-        ret.push(render(result.value, ret.length));
-        result = iterator.next();
-      }
-    } else {
-      keys = Object.keys(val);
-      ret = new Array(keys.length);
-      for (i = 0, l = keys.length; i < l; i++) {
-        key = keys[i];
-        ret[i] = render(val[key], key, i);
+  var res;
+  if (!slots) {
+    res = {};
+  } else if (slots._normalized) {
+    return slots
+  } else {
+    res = {};
+    for (var key in slots) {
+      if (slots[key] && key[0] !== '$') {
+        res[key] = normalizeScopedSlot(slots[key]);
       }
     }
   }
-  if (!isDef(ret)) {
-    ret = [];
+  // expose normal slots on scopedSlots
+  for (var key$1 in normalSlots) {
+    if (!(key$1 in res)) {
+      res[key$1] = proxyNormalSlot(normalSlots, key$1);
+    }
   }
-  (ret)._isVList = true;
-  return ret
+  def(res, '_normalized', true);
+  def(res, '$stable', slots ? !!slots.$stable : true);
+  return res
 }
 
-/*  */
-
-/**
- * Runtime helper for rendering <slot>
- */
-function renderSlot (
-  name,
-  fallback,
-  props,
-  bindObject
-) {
-  var scopedSlotFn = this.$scopedSlots[name];
-  var nodes;
-  if (scopedSlotFn) { // scoped slot
-    props = props || {};
-    if (bindObject) {
-      if (!isObject(bindObject)) {
-        warn(
-          'slot v-bind without argument expects an Object',
-          this
-        );
-      }
-      props = extend(extend({}, bindObject), props);
-    }
-    nodes = scopedSlotFn(props) || fallback;
-  } else {
-    nodes = this.$slots[name] || fallback;
+function normalizeScopedSlot(fn) {
+  return function (scope) {
+    var res = fn(scope);
+    return res && typeof res === 'object' && !Array.isArray(res)
+      ? [res] // single vnode
+      : normalizeChildren(res)
   }
+}
 
-  var target = props && props.slot;
-  if (target) {
-    return this.$createElement('template', { slot: target }, nodes)
-  } else {
-    return nodes
-  }
+function proxyNormalSlot(slots, key) {
+  return function () { return slots[key]; }
 }
 
 /*  */
 
-/**
- * Runtime helper for resolving filters
- */
-function resolveFilter (id) {
-  return resolveAsset(this.$options, 'filters', id, true) || identity
-}
+var currentRenderingInstance = null;
 
 /*  */
 
-function isKeyNotMatch (expect, actual) {
-  if (Array.isArray(expect)) {
-    return expect.indexOf(actual) === -1
-  } else {
-    return expect !== actual
+function ensureCtor (comp, base) {
+  if (
+    comp.__esModule ||
+    (hasSymbol && comp[Symbol.toStringTag] === 'Module')
+  ) {
+    comp = comp.default;
   }
+  return isObject(comp)
+    ? base.extend(comp)
+    : comp
 }
 
-/**
- * Runtime helper for checking keyCodes from config.
- * exposed as Vue.prototype._k
- * passing in eventKeyName as last argument separately for backwards compat
- */
-function checkKeyCodes (
-  eventKeyCode,
-  key,
-  builtInKeyCode,
-  eventKeyName,
-  builtInKeyName
+function createAsyncPlaceholder (
+  factory,
+  data,
+  context,
+  children,
+  tag
 ) {
-  var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
-  if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
-    return isKeyNotMatch(builtInKeyName, eventKeyName)
-  } else if (mappedKeyCode) {
-    return isKeyNotMatch(mappedKeyCode, eventKeyCode)
-  } else if (eventKeyName) {
-    return hyphenate(eventKeyName) !== key
-  }
+  var node = createEmptyVNode();
+  node.asyncFactory = factory;
+  node.asyncMeta = { data: data, context: context, children: children, tag: tag };
+  return node
 }
 
-/*  */
-
-/**
- * Runtime helper for merging v-bind="object" into a VNode's data.
- */
-function bindObjectProps (
-  data,
-  tag,
-  value,
-  asProp,
-  isSync
+function resolveAsyncComponent (
+  factory,
+  baseCtor
 ) {
-  if (value) {
-    if (!isObject(value)) {
+  if (isTrue(factory.error) && isDef(factory.errorComp)) {
+    return factory.errorComp
+  }
+
+  if (isDef(factory.resolved)) {
+    return factory.resolved
+  }
+
+  if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
+    return factory.loadingComp
+  }
+
+  var owner = currentRenderingInstance;
+  if (isDef(factory.owners)) {
+    // already pending
+    factory.owners.push(owner);
+  } else {
+    var owners = factory.owners = [owner];
+    var sync = true;
+
+    var forceRender = function (renderCompleted) {
+      for (var i = 0, l = owners.length; i < l; i++) {
+        (owners[i]).$forceUpdate();
+      }
+
+      if (renderCompleted) {
+        owners.length = 0;
+      }
+    };
+
+    var resolve = once(function (res) {
+      // cache resolved
+      factory.resolved = ensureCtor(res, baseCtor);
+      // invoke callbacks only if this is not a synchronous resolve
+      // (async resolves are shimmed as synchronous during SSR)
+      if (!sync) {
+        forceRender(true);
+      } else {
+        owners.length = 0;
+      }
+    });
+
+    var reject = once(function (reason) {
       warn(
-        'v-bind without argument expects an Object or Array value',
-        this
+        "Failed to resolve async component: " + (String(factory)) +
+        (reason ? ("\nReason: " + reason) : '')
       );
-    } else {
-      if (Array.isArray(value)) {
-        value = toObject(value);
+      if (isDef(factory.errorComp)) {
+        factory.error = true;
+        forceRender(true);
       }
-      var hash;
-      var loop = function ( key ) {
-        if (
-          key === 'class' ||
-          key === 'style' ||
-          isReservedAttribute(key)
-        ) {
-          hash = data;
-        } else {
-          var type = data.attrs && data.attrs.type;
-          hash = asProp || config.mustUseProp(tag, type, key)
-            ? data.domProps || (data.domProps = {})
-            : data.attrs || (data.attrs = {});
-        }
-        var camelizedKey = camelize(key);
-        if (!(key in hash) && !(camelizedKey in hash)) {
-          hash[key] = value[key];
-
-          if (isSync) {
-            var on = data.on || (data.on = {});
-            on[("update:" + camelizedKey)] = function ($event) {
-              value[key] = $event;
-            };
-          }
-        }
-      };
+    });
 
-      for (var key in value) loop( key );
-    }
-  }
-  return data
-}
+    var res = factory(resolve, reject);
 
-/*  */
+    if (isObject(res)) {
+      if (isPromise(res)) {
+        // () => Promise
+        if (isUndef(factory.resolved)) {
+          res.then(resolve, reject);
+        }
+      } else if (isPromise(res.component)) {
+        res.component.then(resolve, reject);
 
-/**
- * Runtime helper for rendering static trees.
- */
-function renderStatic (
-  index,
-  isInFor
-) {
-  var cached = this._staticTrees || (this._staticTrees = []);
-  var tree = cached[index];
-  // if has already-rendered static tree and not inside v-for,
-  // we can reuse the same tree.
-  if (tree && !isInFor) {
-    return tree
-  }
-  // otherwise, render a fresh tree.
-  tree = cached[index] = this.$options.staticRenderFns[index].call(
-    this._renderProxy,
-    null,
-    this // for render fns generated for functional component templates
-  );
-  markStatic(tree, ("__static__" + index), false);
-  return tree
-}
+        if (isDef(res.error)) {
+          factory.errorComp = ensureCtor(res.error, baseCtor);
+        }
 
-/**
- * Runtime helper for v-once.
- * Effectively it means marking the node as static with a unique key.
- */
-function markOnce (
-  tree,
-  index,
-  key
-) {
-  markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
-  return tree
-}
+        if (isDef(res.loading)) {
+          factory.loadingComp = ensureCtor(res.loading, baseCtor);
+          if (res.delay === 0) {
+            factory.loading = true;
+          } else {
+            setTimeout(function () {
+              if (isUndef(factory.resolved) && isUndef(factory.error)) {
+                factory.loading = true;
+                forceRender(false);
+              }
+            }, res.delay || 200);
+          }
+        }
 
-function markStatic (
-  tree,
-  key,
-  isOnce
-) {
-  if (Array.isArray(tree)) {
-    for (var i = 0; i < tree.length; i++) {
-      if (tree[i] && typeof tree[i] !== 'string') {
-        markStaticNode(tree[i], (key + "_" + i), isOnce);
+        if (isDef(res.timeout)) {
+          setTimeout(function () {
+            if (isUndef(factory.resolved)) {
+              reject(
+                "timeout (" + (res.timeout) + "ms)"
+              );
+            }
+          }, res.timeout);
+        }
       }
     }
-  } else {
-    markStaticNode(tree, key, isOnce);
+
+    sync = false;
+    // return in case resolved synchronously
+    return factory.loading
+      ? factory.loadingComp
+      : factory.resolved
   }
 }
 
-function markStaticNode (node, key, isOnce) {
-  node.isStatic = true;
-  node.key = key;
-  node.isOnce = isOnce;
-}
+/*  */
 
 /*  */
 
-function bindObjectListeners (data, value) {
-  if (value) {
-    if (!isPlainObject(value)) {
-      warn(
-        'v-on without argument expects an Object value',
-        this
-      );
-    } else {
-      var on = data.on = data.on ? extend({}, data.on) : {};
-      for (var key in value) {
-        var existing = on[key];
-        var ours = value[key];
-        on[key] = existing ? [].concat(existing, ours) : ours;
-      }
-    }
-  }
-  return data
-}
+/*  */
 
 /*  */
 
-function bindDynamicKeys (baseObj, values) {
-  for (var i = 0; i < values.length; i += 2) {
-    var key = values[i];
-    if (typeof key === 'string' && key) {
-      baseObj[values[i]] = values[i + 1];
-    } else if (key !== '' && key !== null) {
-      // null is a speical value for explicitly removing a binding
-      warn(
-        ("Invalid value for dynamic directive argument (expected string or null): " + key),
-        this
-      );
+var target;
+
+function add (event, fn) {
+  target.$on(event, fn);
+}
+
+function remove$1 (event, fn) {
+  target.$off(event, fn);
+}
+
+function createOnceHandler (event, fn) {
+  var _target = target;
+  return function onceHandler () {
+    var res = fn.apply(null, arguments);
+    if (res !== null) {
+      _target.$off(event, onceHandler);
     }
   }
-  return baseObj
 }
 
-// helper to dynamically append modifier runtime markers to event names.
-// ensure only append when value is already string, otherwise it will be cast
-// to string and cause the type check to miss.
-function prependModifier (value, symbol) {
-  return typeof value === 'string' ? symbol + value : value
+function updateComponentListeners (
+  vm,
+  listeners,
+  oldListeners
+) {
+  target = vm;
+  updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
+  target = undefined;
 }
 
 /*  */
 
-function installRenderHelpers (target) {
-  target._o = markOnce;
-  target._n = toNumber;
-  target._s = toString;
-  target._l = renderList;
-  target._t = renderSlot;
-  target._q = looseEqual;
-  target._i = looseIndexOf;
-  target._m = renderStatic;
-  target._f = resolveFilter;
-  target._k = checkKeyCodes;
-  target._b = bindObjectProps;
-  target._v = createTextVNode;
-  target._e = createEmptyVNode;
-  target._u = resolveScopedSlots;
-  target._g = bindObjectListeners;
-  target._d = bindDynamicKeys;
-  target._p = prependModifier;
+var activeInstance = null;
+
+function updateChildComponent (
+  vm,
+  propsData,
+  listeners,
+  parentVnode,
+  renderChildren
+) {
+
+  // determine whether component has slot children
+  // we need to do this before overwriting $options._renderChildren.
+
+  // check if there are dynamic scopedSlots (hand-written or compiled but with
+  // dynamic slot names). Static scoped slots compiled from template has the
+  // "$stable" marker.
+  var hasDynamicScopedSlot = !!(
+    (parentVnode.data.scopedSlots && !parentVnode.data.scopedSlots.$stable) ||
+    (vm.$scopedSlots !== emptyObject && !vm.$scopedSlots.$stable)
+  );
+
+  // Any static slot children from the parent may have changed during parent's
+  // update. Dynamic scoped slots may also have changed. In such cases, a forced
+  // update is necessary to ensure correctness.
+  var needsForceUpdate = !!(
+    renderChildren ||               // has new static slots
+    vm.$options._renderChildren ||  // has old static slots
+    hasDynamicScopedSlot
+  );
+
+  vm.$options._parentVnode = parentVnode;
+  vm.$vnode = parentVnode; // update vm's placeholder node without re-render
+
+  if (vm._vnode) { // update child tree's parent
+    vm._vnode.parent = parentVnode;
+  }
+  vm.$options._renderChildren = renderChildren;
+
+  // update $attrs and $listeners hash
+  // these are also reactive so they may trigger child update if the child
+  // used them during render
+  vm.$attrs = parentVnode.data.attrs || emptyObject;
+  vm.$listeners = listeners || emptyObject;
+
+  // update props
+  if (propsData && vm.$options.props) {
+    toggleObserving(false);
+    var props = vm._props;
+    var propKeys = vm.$options._propKeys || [];
+    for (var i = 0; i < propKeys.length; i++) {
+      var key = propKeys[i];
+      var propOptions = vm.$options.props; // wtf flow?
+      props[key] = validateProp(key, propOptions, propsData, vm);
+    }
+    toggleObserving(true);
+    // keep a copy of raw propsData
+    vm.$options.propsData = propsData;
+  }
+
+  // update listeners
+  listeners = listeners || emptyObject;
+  var oldListeners = vm.$options._parentListeners;
+  vm.$options._parentListeners = listeners;
+  updateComponentListeners(vm, listeners, oldListeners);
+
+  // resolve slots + force update if has children
+  if (needsForceUpdate) {
+    vm.$slots = resolveSlots(renderChildren, parentVnode.context);
+    vm.$forceUpdate();
+  }
 }
 
-/*  */
+function isInInactiveTree (vm) {
+  while (vm && (vm = vm.$parent)) {
+    if (vm._inactive) { return true }
+  }
+  return false
+}
 
-function normalizeScopedSlots (
-  slots,
-  normalSlots
-) {
-  var res;
-  if (!slots) {
-    res = {};
-  } else if (slots._normalized) {
-    return slots
-  } else {
-    res = {};
-    for (var key in slots) {
-      if (slots[key] && key[0] !== '$') {
-        res[key] = normalizeScopedSlot(normalSlots, key, slots[key]);
-      }
+function activateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = false;
+    if (isInInactiveTree(vm)) {
+      return
     }
+  } else if (vm._directInactive) {
+    return
   }
-  // expose normal slots on scopedSlots
-  for (var key$1 in normalSlots) {
-    if (!(key$1 in res)) {
-      res[key$1] = proxyNormalSlot(normalSlots, key$1);
+  if (vm._inactive || vm._inactive === null) {
+    vm._inactive = false;
+    for (var i = 0; i < vm.$children.length; i++) {
+      activateChildComponent(vm.$children[i]);
     }
+    callHook(vm, 'activated');
   }
-  res._normalized = true;
-  res.$stable = slots ? slots.$stable : true;
-  return res
 }
 
-function normalizeScopedSlot(normalSlots, key, fn) {
-  var normalized = function (scope) {
-    if ( scope === void 0 ) scope = {};
+function deactivateChildComponent (vm, direct) {
+  if (direct) {
+    vm._directInactive = true;
+    if (isInInactiveTree(vm)) {
+      return
+    }
+  }
+  if (!vm._inactive) {
+    vm._inactive = true;
+    for (var i = 0; i < vm.$children.length; i++) {
+      deactivateChildComponent(vm.$children[i]);
+    }
+    callHook(vm, 'deactivated');
+  }
+}
 
-    var res = fn(scope);
-    return res && typeof res === 'object' && !Array.isArray(res)
-      ? [res] // single vnode
-      : normalizeChildren(res)
-  };
-  // proxy scoped slots on normal $slots
-  if (!hasOwn(normalSlots, key)) {
-    Object.defineProperty(normalSlots, key, {
-      get: normalized
-    });
+function callHook (vm, hook) {
+  // #7573 disable dep collection when invoking lifecycle hooks
+  pushTarget();
+  var handlers = vm.$options[hook];
+  var info = hook + " hook";
+  if (handlers) {
+    for (var i = 0, j = handlers.length; i < j; i++) {
+      invokeWithErrorHandling(handlers[i], vm, null, vm, info);
+    }
+  }
+  if (vm._hasHookEvent) {
+    vm.$emit('hook:' + hook);
   }
-  return normalized
+  popTarget();
 }
 
-function proxyNormalSlot(slots, key) {
-  return function () { return slots[key]; }
+/*  */
+
+// Async edge case fix requires storing an event listener's attach timestamp.
+var getNow = Date.now;
+
+// Determine what event timestamp the browser is using. Annoyingly, the
+// timestamp can either be hi-res (relative to page load) or low-res
+// (relative to UNIX epoch), so in order to compare time we have to use the
+// same timestamp type when saving the flush timestamp.
+if (inBrowser && getNow() > document.createEvent('Event').timeStamp) {
+  // if the low-res timestamp which is bigger than the event timestamp
+  // (which is evaluated AFTER) it means the event is using a hi-res timestamp,
+  // and we need to use the hi-res version for event listeners as well.
+  getNow = function () { return performance.now(); };
+}
+
+/**
+ * Queue a kept-alive component that was activated during patch.
+ * The queue will be processed after the entire tree has been patched.
+ */
+function queueActivatedComponent (vm) {
+  // setting _inactive to false here so that a render function can
+  // rely on checking whether it's in an inactive tree (e.g. router-view)
+  vm._inactive = false;
 }
 
 /*  */
 
 /*  */
 
+/*  */
+
 function resolveInject (inject, vm) {
   if (inject) {
     // inject is :any because flow is not smart enough to figure out cached
@@ -7901,7 +7933,7 @@ function createComponent (
   var asyncFactory;
   if (isUndef(Ctor.cid)) {
     asyncFactory = Ctor;
-    Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
+    Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
     if (Ctor === undefined) {
       // return a placeholder node for async component, which is rendered
       // as a comment node but preserves all the raw information for the node.
diff --git a/packages/vue-server-renderer/build.prod.js b/packages/vue-server-renderer/build.prod.js
index d09674532fb..386b3c2c98e 100644
--- a/packages/vue-server-renderer/build.prod.js
+++ b/packages/vue-server-renderer/build.prod.js
@@ -1 +1 @@
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i=e.asyncMeta,o=i.data,a=i.children,s=i.tag,c=e.asyncMeta.context,u=zi(n,o,c,a,s);u?u.componentOptions?Gi(u,t,r):Array.isArray(u)?(r.renderStates.push({type:"Fragment",children:u,rendered:0,total:u.length}),r.next()):Zi(u,t,r):r.write("\x3c!----\x3e",r.next)};if(n.resolved)return void i(n.resolved);var o,a=r.done;try{o=n(i,a)}catch(e){a(e)}if(o)if("function"==typeof o.then)o.then(i,a).catch(a);else{var s=o.component;s&&"function"==typeof s.then&&s.then(i,a).catch(a)}}(e,t,r):r.write("\x3c!--"+e.text+"--\x3e",r.next):r.write(e.raw?e.text:R(String(e.text)),r.next)}function Xi(e,t){var r=e._ssrRegister;return t.caching&&i(r)&&t.componentBuffer[t.componentBuffer.length-1].add(r),r}function Gi(e,t,r){var o=r.write,a=r.next,s=r.userContext,c=e.componentOptions.Ctor,u=c.options.serverCacheKey,l=c.options.name,f=r.cache,p=Xi(c.options,o);if(i(u)&&i(f)&&i(l)){var d=u(e.componentOptions.propsData);if(!1===d)return void Yi(e,t,r);var v=l+"::"+d,h=r.has,m=r.get;i(h)?h(v,function(n){!0===n&&i(m)?m(v,function(e){i(p)&&p(s),e.components.forEach(function(e){return e(s)}),o(e.html,a)}):Qi(e,t,v,r)}):i(m)&&m(v,function(n){i(n)?(i(p)&&p(s),n.components.forEach(function(e){return e(s)}),o(n.html,a)):Qi(e,t,v,r)})}else i(u)&&n(f)&&Hi("[vue-server-renderer] Component "+(c.options.name||"(anonymous)")+" implemented serverCacheKey, but no cache was provided to the renderer."),i(u)&&n(l)&&Hi('[vue-server-renderer] Components that implement "serverCacheKey" must also define a unique "name" option.'),Yi(e,t,r)}function Qi(e,t,r,n){var i=n.write;i.caching=!0;var o=i.cacheBuffer,a=o.push("")-1,s=i.componentBuffer;s.push(new Set),n.renderStates.push({type:"ComponentWithCache",key:r,buffer:o,bufferIndex:a,componentBuffer:s}),Yi(e,t,n)}function Yi(e,t,r){var n=r.activeInstance;e.ssrContext=r.userContext;var i=r.activeInstance=Bi(e,r.activeInstance);Vi(i);var o=r.done;Wi(i,function(){var o=i._render();o.parent=e,r.renderStates.push({type:"Component",prevActive:n}),Zi(o,t,r)},o)}function eo(e,t,r,n){return function(i,o,a,s){Ji=Object.create(null);var c=new yt({activeInstance:i,userContext:a,write:o,done:s,renderNode:Zi,isUnaryTag:r,modules:e,directives:t,cache:n});!function(e){if(!e._ssrNode){for(var t=e.constructor;t.super;)t=t.super;$(t.prototype,Gn),t.FunctionalRenderContext&&$(t.FunctionalRenderContext.prototype,Gn)}}(i),Vi(i);Wi(i,function(){Zi(i._render(),!0,c)},s)}}var to=function(e){return/\.js(\?[^.]+)?$/.test(e)};function ro(){var e,t;return{promise:new Promise(function(r,n){e=r,t=n}),cb:function(r,n){if(r)return t(r);e(n||"")}}}var no=function(e){function t(t,r,n){e.call(this),this.started=!1,this.renderer=t,this.template=r,this.context=n||{},this.inject=t.inject}return e&&(t.__proto__=e),t.prototype=Object.create(e&&e.prototype),t.prototype.constructor=t,t.prototype._transform=function(e,t,r){this.started||(this.emit("beforeStart"),this.start()),this.push(e),r()},t.prototype.start=function(){if(this.started=!0,this.push(this.template.head(this.context)),this.inject){this.context.head&&this.push(this.context.head);var e=this.renderer.renderResourceHints(this.context);e&&this.push(e);var t=this.renderer.renderStyles(this.context);t&&this.push(t)}this.push(this.template.neck(this.context))},t.prototype._flush=function(e){if(this.emit("beforeEnd"),this.inject){var t=this.renderer.renderState(this.context);t&&this.push(t);var r=this.renderer.renderScripts(this.context);r&&this.push(r)}this.push(this.template.tail(this.context)),e()},t}(require("stream").Transform),io=require("lodash.template"),oo={escape:/{{([^{][\s\S]+?[^}])}}/g,interpolate:/{{{([\s\S]+?)}}}/g};function ao(e){var t=function(e){var t=new Map;return Object.keys(e.modules).forEach(function(r){t.set(r,function(e,t){var r=[],n=t.modules[e];return n&&n.forEach(function(e){var n=t.all[e];(t.async.indexOf(n)>-1||!/\.js($|\?)/.test(n))&&r.push(n)}),r}(r,e))}),t}(e);return function(e){for(var r=new Set,n=0;n<e.length;n++){var i=t.get(e[n]);if(i)for(var o=0;o<i.length;o++)r.add(i[o])}return Array.from(r)}}var so=require("path"),co=require("serialize-javascript"),uo=function(e){this.options=e,this.inject=!1!==e.inject;var t=e.template;if(this.parsedTemplate=t?"string"==typeof t?function(e,t){if(void 0===t&&(t="\x3c!--vue-ssr-outlet--\x3e"),"object"==typeof e)return e;var r=e.indexOf("</head>"),n=e.indexOf(t);if(n<0)throw new Error("Content placeholder not found in template.");return r<0&&(r=e.indexOf("<body>"))<0&&(r=n),{head:io(e.slice(0,r),oo),neck:io(e.slice(r,n),oo),tail:io(e.slice(n+t.length),oo)}}(t):t:null,this.serialize=e.serializer||function(e){return co(e,{isJSON:!0})},e.clientManifest){var r=this.clientManifest=e.clientManifest;this.publicPath=""===r.publicPath?"":r.publicPath.replace(/([^\/])$/,"$1/"),this.preloadFiles=(r.initial||[]).map(lo),this.prefetchFiles=(r.async||[]).map(lo),this.mapFiles=ao(r)}};function lo(e){var t=e.replace(/\?.*/,""),r=so.extname(t).slice(1);return{file:e,extension:r,fileWithoutQuery:t,asType:fo(r)}}function fo(e){return"js"===e?"script":"css"===e?"style":/jpe?g|png|svg|gif|webp|ico/.test(e)?"image":/woff2?|ttf|otf|eot/.test(e)?"font":""}uo.prototype.bindRenderFns=function(e){var t=this;["ResourceHints","State","Scripts","Styles"].forEach(function(r){e["render"+r]=t["render"+r].bind(t,e)}),e.getPreloadFiles=t.getPreloadFiles.bind(t,e)},uo.prototype.render=function(e,t){var r=this.parsedTemplate;if(!r)throw new Error("render cannot be called without a template.");return t=t||{},"function"==typeof r?r(e,t):this.inject?r.head(t)+(t.head||"")+this.renderResourceHints(t)+this.renderStyles(t)+r.neck(t)+e+this.renderState(t)+this.renderScripts(t)+r.tail(t):r.head(t)+r.neck(t)+e+r.tail(t)},uo.prototype.renderStyles=function(e){var t=this,r=this.preloadFiles||[],n=this.getUsedAsyncFiles(e)||[],i=r.concat(n).filter(function(e){return function(e){return/\.css(\?[^.]+)?$/.test(e)}(e.file)});return(i.length?i.map(function(e){var r=e.file;return'<link rel="stylesheet" href="'+t.publicPath+r+'">'}).join(""):"")+(e.styles||"")},uo.prototype.renderResourceHints=function(e){return this.renderPreloadLinks(e)+this.renderPrefetchLinks(e)},uo.prototype.getPreloadFiles=function(e){var t=this.getUsedAsyncFiles(e);return this.preloadFiles||t?(this.preloadFiles||[]).concat(t||[]):[]},uo.prototype.renderPreloadLinks=function(e){var t=this,r=this.getPreloadFiles(e),n=this.options.shouldPreload;return r.length?r.map(function(e){var r=e.file,i=e.extension,o=e.fileWithoutQuery,a=e.asType,s="";return n||"script"===a||"style"===a?n&&!n(o,a)?"":("font"===a&&(s=' type="font/'+i+'" crossorigin'),'<link rel="preload" href="'+t.publicPath+r+'"'+(""!==a?' as="'+a+'"':"")+s+">"):""}).join(""):""},uo.prototype.renderPrefetchLinks=function(e){var t=this,r=this.options.shouldPrefetch;if(this.prefetchFiles){var n=this.getUsedAsyncFiles(e);return this.prefetchFiles.map(function(e){var i=e.file,o=e.fileWithoutQuery,a=e.asType;return r&&!r(o,a)?"":function(e){return n&&n.some(function(t){return t.file===e})}(i)?"":'<link rel="prefetch" href="'+t.publicPath+i+'">'}).join("")}return""},uo.prototype.renderState=function(e,t){var r=t||{},n=r.contextKey;void 0===n&&(n="state");var i=r.windowKey;void 0===i&&(i="__INITIAL_STATE__");var o=this.serialize(e[n]),a=e.nonce?' nonce="'+e.nonce+'"':"";return e[n]?"<script"+a+">window."+i+"="+o+";(function(){var s;(s=document.currentScript||document.scripts[document.scripts.length-1]).parentNode.removeChild(s);}());<\/script>":""},uo.prototype.renderScripts=function(e){var t=this;if(this.clientManifest){var r=this.preloadFiles.filter(function(e){var t=e.file;return to(t)}),n=(this.getUsedAsyncFiles(e)||[]).filter(function(e){var t=e.file;return to(t)});return[r[0]].concat(n,r.slice(1)).map(function(e){var r=e.file;return'<script src="'+t.publicPath+r+'" defer><\/script>'}).join("")}return""},uo.prototype.getUsedAsyncFiles=function(e){if(!e._mappedFiles&&e._registeredComponents&&this.mapFiles){var t=Array.from(e._registeredComponents);e._mappedFiles=this.mapFiles(t).map(lo)}return e._mappedFiles},uo.prototype.createStream=function(e){if(!this.parsedTemplate)throw new Error("createStream cannot be called without a template.");return new no(this,this.parsedTemplate,e||{})};var po=require("vm"),vo=require("path"),ho=require("resolve"),mo=require("module");function yo(e){var t={Buffer:Buffer,console:console,process:process,setTimeout:setTimeout,setInterval:setInterval,setImmediate:setImmediate,clearTimeout:clearTimeout,clearInterval:clearInterval,clearImmediate:clearImmediate,__VUE_SSR_CONTEXT__:e};return t.global=t,t}function go(e,t,r){var n={},i={};return function o(a,s,c){if(void 0===c&&(c={}),c[a])return c[a];var u=function(t){if(n[t])return n[t];var r=e[t],i=mo.wrap(r),o=new po.Script(i,{filename:t,displayErrors:!0});return n[t]=o,o}(a),l={exports:{}};(!1===r?u.runInThisContext():u.runInNewContext(s)).call(l.exports,l.exports,function(r){return r=vo.posix.join(".",r),e[r]?o(r,s,c):t?require(i[r]||(i[r]=ho.sync(r,{basedir:t}))):require(r)},l);var f=Object.prototype.hasOwnProperty.call(l.exports,"default")?l.exports.default:l.exports;return c[a]=f,f}}function bo(e,t,r,n){var i,o,a=go(t,r,n);return!1!==n&&"once"!==n?function(t){return void 0===t&&(t={}),new Promise(function(r){t._registeredComponents=new Set;var n=a(e,yo(t));r("function"==typeof n?n(t):n)})}:function(t){return void 0===t&&(t={}),new Promise(function(r){if(!i){var s="once"===n?yo():global;if(o=s.__VUE_SSR_CONTEXT__={},i=a(e,s),delete s.__VUE_SSR_CONTEXT__,"function"!=typeof i)throw new Error("bundle export should be a function when using { runInNewContext: false }.")}if(t._registeredComponents=new Set,o._styles){t._styles=function e(t){if(u(t)){var r={};for(var n in t)r[n]=e(t[n]);return r}return Array.isArray(t)?t.slice():t}(o._styles);var c=o._renderStyles;c&&Object.defineProperty(t,"styles",{enumerable:!0,get:function(){return c(t._styles)}})}r(i(t))})}}var _o=require("source-map").SourceMapConsumer,wo=/\(([^)]+\.js):(\d+):(\d+)\)$/;function xo(e,t){e&&"string"==typeof e.stack&&(e.stack=e.stack.split("\n").map(function(e){return function(e,t){var r=e.match(wo),n=r&&t[r[1]];if(null!=r&&n){var i=n.originalPositionFor({line:Number(r[2]),column:Number(r[3])});if(null!=i.source){var o=i.source,a=i.line,s=i.column,c="("+o.replace(/^webpack:\/\/\//,"")+":"+String(a)+":"+String(s)+")";return e.replace(wo,c)}return e}return e}(e,t)}).join("\n"))}var So=require("fs"),$o=require("path"),Ao=require("stream").PassThrough,Oo="Invalid server-rendering bundle format. Should be a string or a bundle Object of type:\n\n{\n  entry: string;\n  files: { [filename: string]: string; };\n  maps: { [filename: string]: string; };\n}\n";function ko(e){return void 0===e&&(e={}),function(e){void 0===e&&(e={});var t=e.modules;void 0===t&&(t=[]);var r=e.directives;void 0===r&&(r={});var n=e.isUnaryTag;void 0===n&&(n=function(){return!1});var i=e.template,o=e.inject,a=e.cache,s=e.shouldPreload,c=e.shouldPrefetch,u=e.clientManifest,l=e.serializer,f=eo(t,r,n,a),p=new uo({template:i,inject:o,shouldPreload:s,shouldPrefetch:c,clientManifest:u,serializer:l});return{renderToString:function(e,t,r){var n,o;"function"==typeof t&&(r=t,t={}),t&&p.bindRenderFns(t),r||(o=(n=ro()).promise,r=n.cb);var a="",s=ht(function(e){return a+=e,!1},r);try{f(e,s,t,function(e){if(e)return r(e);if(t&&t.rendered&&t.rendered(t),i)try{var n=p.render(a,t);"string"!=typeof n?n.then(function(e){return r(null,e)}).catch(r):r(null,n)}catch(e){r(e)}else r(null,a)})}catch(e){r(e)}return o},renderToStream:function(e,t){t&&p.bindRenderFns(t);var r=new mt(function(r,n){f(e,r,t,n)});if(i){if("function"==typeof i)throw new Error("function template is only supported in renderToString.");var n=p.createStream(t);if(r.on("error",function(e){n.emit("error",e)}),r.pipe(n),t&&t.rendered){var o=t.rendered;r.once("beforeEnd",function(){o(t)})}return n}if(t&&t.rendered){var a=t.rendered;r.once("beforeEnd",function(){a(t)})}return r}}}($($({},e),{isUnaryTag:ut,canBeLeftOpenTag:lt,modules:ot,directives:$(ct,e.directives)}))}process.env.VUE_ENV="server";var Co=function(e){return function(t,r){var n,i,o;void 0===r&&(r={});var a=r.basedir;if("string"==typeof t&&/\.js(on)?$/.test(t)&&$o.isAbsolute(t)){if(!So.existsSync(t))throw new Error("Cannot locate bundle file: "+t);var s=/\.json$/.test(t);if(a=a||$o.dirname(t),t=So.readFileSync(t,"utf-8"),s)try{t=JSON.parse(t)}catch(e){throw new Error("Invalid JSON bundle file: "+t)}}if("object"==typeof t){if(i=t.entry,n=t.files,a=a||t.basedir,o=function(e){var t={};return Object.keys(e).forEach(function(r){t[r]=new _o(e[r])}),t}(t.maps),"string"!=typeof i||"object"!=typeof n)throw new Error(Oo)}else{if("string"!=typeof t)throw new Error(Oo);i="__vue_ssr_bundle__",n={__vue_ssr_bundle__:t},o={}}var c=e(r),u=bo(i,n,a,r.runInNewContext);return{renderToString:function(e,t){var r,n;return"function"==typeof e&&(t=e,e={}),t||(n=(r=ro()).promise,t=r.cb),u(e).catch(function(e){xo(e,o),t(e)}).then(function(r){r&&c.renderToString(r,e,function(e,r){xo(e,o),t(e,r)})}),n},renderToStream:function(e){var t=new Ao;return u(e).catch(function(e){xo(e,o),process.nextTick(function(){t.emit("error",e)})}).then(function(n){if(n){var i=c.renderToStream(n,e);i.on("error",function(e){xo(e,o),t.emit("error",e)}),r&&r.template&&(i.on("beforeStart",function(){t.emit("beforeStart")}),i.on("beforeEnd",function(){t.emit("beforeEnd")})),i.pipe(t)}}),t}}}}(ko);exports.createRenderer=ko,exports.createBundleRenderer=Co;
\ No newline at end of file
diff --git a/packages/vue-server-renderer/package.json b/packages/vue-server-renderer/package.json
index 896cbdde5be..297e9ccd30d 100644
--- a/packages/vue-server-renderer/package.json
+++ b/packages/vue-server-renderer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-server-renderer",
-  "version": "2.6.2",
+  "version": "2.6.3",
   "description": "server renderer for Vue 2.0",
   "main": "index.js",
   "types": "types/index.d.ts",
diff --git a/packages/vue-template-compiler/browser.js b/packages/vue-template-compiler/browser.js
index 96dc736ad75..77f6de7b71c 100644
--- a/packages/vue-template-compiler/browser.js
+++ b/packages/vue-template-compiler/browser.js
@@ -745,6 +745,7 @@
   var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
   var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
   var isPhantomJS = UA && /phantomjs/.test(UA);
+  var isFF = UA && UA.match(/firefox\/(\d+)/);
 
   // Firefox has a "watch" function on Object.prototype...
   var nativeWatch = ({}).watch;
@@ -2747,6 +2748,8 @@
 
   var decodeHTMLCached = cached(he.decode);
 
+  var emptySlotScopeToken = "_empty_";
+
   // configurable state
   var warn$1;
   var delimiters;
@@ -3359,7 +3362,7 @@
           var dynamic = ref.dynamic;
           el.slotTarget = name;
           el.slotTargetDynamic = dynamic;
-          el.slotScope = slotBinding.value || "_"; // force it into a scoped slot for perf
+          el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
         }
       } else {
         // v-slot on component, denotes default slot
@@ -3394,8 +3397,13 @@
           var slotContainer = slots[name$1] = createASTElement('template', [], el);
           slotContainer.slotTarget = name$1;
           slotContainer.slotTargetDynamic = dynamic$1;
-          slotContainer.children = el.children.filter(function (c) { return !(c).slotScope; });
-          slotContainer.slotScope = slotBinding$1.value || "_";
+          slotContainer.children = el.children.filter(function (c) {
+            if (!c.slotScope) {
+              c.parent = slotContainer;
+              return true
+            }
+          });
+          slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
           // remove children as they are returned from scopedSlots now
           el.children = [];
           // mark el non-plain so data gets generated
@@ -4490,7 +4498,7 @@
     }
     // scoped slots
     if (el.scopedSlots) {
-      data += (genScopedSlots(el.scopedSlots, state)) + ",";
+      data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
     }
     // component v-model
     if (el.model) {
@@ -4561,16 +4569,34 @@
   }
 
   function genScopedSlots (
+    el,
     slots,
     state
   ) {
-    var hasDynamicKeys = Object.keys(slots).some(function (key) {
+    // by default scoped slots are considered "stable", this allows child
+    // components with only scoped slots to skip forced updates from parent.
+    // but in some cases we have to bail-out of this optimization
+    // for example if the slot contains dynamic names, has v-if or v-for on them...
+    var needsForceUpdate = Object.keys(slots).some(function (key) {
       var slot = slots[key];
       return slot.slotTargetDynamic || slot.if || slot.for
     });
+    // OR when it is inside another scoped slot (the reactivity is disconnected)
+    // #9438
+    if (!needsForceUpdate) {
+      var parent = el.parent;
+      while (parent) {
+        if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+          needsForceUpdate = true;
+          break
+        }
+        parent = parent.parent;
+      }
+    }
+
     return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
         return genScopedSlot(slots[key], state)
-      }).join(',')) + "]" + (hasDynamicKeys ? ",true" : "") + ")")
+      }).join(',')) + "]" + (needsForceUpdate ? ",true" : "") + ")")
   }
 
   function genScopedSlot (
@@ -4584,7 +4610,10 @@
     if (el.for && !el.forProcessed) {
       return genFor(el, state, genScopedSlot)
     }
-    var fn = "function(" + (String(el.slotScope)) + "){" +
+    var slotScope = el.slotScope === emptySlotScopeToken
+      ? ""
+      : String(el.slotScope);
+    var fn = "function(" + slotScope + "){" +
       "return " + (el.tag === 'template'
         ? el.if && isLegacySyntax
           ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
@@ -4677,7 +4706,14 @@
     var slotName = el.slotName || '"default"';
     var children = genChildren(el, state);
     var res = "_t(" + slotName + (children ? ("," + children) : '');
-    var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
+    var attrs = el.attrs || el.dynamicAttrs
+      ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+          // slot props are camelized
+          name: camelize(attr.name),
+          value: attr.value,
+          dynamic: attr.dynamic
+        }); }))
+      : null;
     var bind$$1 = el.attrsMap['v-bind'];
     if ((attrs || bind$$1) && !children) {
       res += ",null";
diff --git a/packages/vue-template-compiler/build.js b/packages/vue-template-compiler/build.js
index cdb1aef88e8..570a0d632bc 100644
--- a/packages/vue-template-compiler/build.js
+++ b/packages/vue-template-compiler/build.js
@@ -703,6 +703,7 @@ var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android'
 var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
 var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
 var isPhantomJS = UA && /phantomjs/.test(UA);
+var isFF = UA && UA.match(/firefox\/(\d+)/);
 
 // Firefox has a "watch" function on Object.prototype...
 var nativeWatch = ({}).watch;
@@ -2367,6 +2368,8 @@ var invalidAttributeRE = /[\s"'<>\/=]/;
 
 var decodeHTMLCached = cached(he.decode);
 
+var emptySlotScopeToken = "_empty_";
+
 // configurable state
 var warn$1;
 var delimiters;
@@ -2979,7 +2982,7 @@ function processSlotContent (el) {
         var dynamic = ref.dynamic;
         el.slotTarget = name;
         el.slotTargetDynamic = dynamic;
-        el.slotScope = slotBinding.value || "_"; // force it into a scoped slot for perf
+        el.slotScope = slotBinding.value || emptySlotScopeToken; // force it into a scoped slot for perf
       }
     } else {
       // v-slot on component, denotes default slot
@@ -3014,8 +3017,13 @@ function processSlotContent (el) {
         var slotContainer = slots[name$1] = createASTElement('template', [], el);
         slotContainer.slotTarget = name$1;
         slotContainer.slotTargetDynamic = dynamic$1;
-        slotContainer.children = el.children.filter(function (c) { return !(c).slotScope; });
-        slotContainer.slotScope = slotBinding$1.value || "_";
+        slotContainer.children = el.children.filter(function (c) {
+          if (!c.slotScope) {
+            c.parent = slotContainer;
+            return true
+          }
+        });
+        slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
         // remove children as they are returned from scopedSlots now
         el.children = [];
         // mark el non-plain so data gets generated
@@ -4121,7 +4129,7 @@ function genData$2 (el, state) {
   }
   // scoped slots
   if (el.scopedSlots) {
-    data += (genScopedSlots(el.scopedSlots, state)) + ",";
+    data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
   }
   // component v-model
   if (el.model) {
@@ -4194,16 +4202,34 @@ function genInlineTemplate (el, state) {
 }
 
 function genScopedSlots (
+  el,
   slots,
   state
 ) {
-  var hasDynamicKeys = Object.keys(slots).some(function (key) {
+  // by default scoped slots are considered "stable", this allows child
+  // components with only scoped slots to skip forced updates from parent.
+  // but in some cases we have to bail-out of this optimization
+  // for example if the slot contains dynamic names, has v-if or v-for on them...
+  var needsForceUpdate = Object.keys(slots).some(function (key) {
     var slot = slots[key];
     return slot.slotTargetDynamic || slot.if || slot.for
   });
+  // OR when it is inside another scoped slot (the reactivity is disconnected)
+  // #9438
+  if (!needsForceUpdate) {
+    var parent = el.parent;
+    while (parent) {
+      if (parent.slotScope && parent.slotScope !== emptySlotScopeToken) {
+        needsForceUpdate = true;
+        break
+      }
+      parent = parent.parent;
+    }
+  }
+
   return ("scopedSlots:_u([" + (Object.keys(slots).map(function (key) {
       return genScopedSlot(slots[key], state)
-    }).join(',')) + "]" + (hasDynamicKeys ? ",true" : "") + ")")
+    }).join(',')) + "]" + (needsForceUpdate ? ",true" : "") + ")")
 }
 
 function genScopedSlot (
@@ -4217,7 +4243,10 @@ function genScopedSlot (
   if (el.for && !el.forProcessed) {
     return genFor(el, state, genScopedSlot)
   }
-  var fn = "function(" + (String(el.slotScope)) + "){" +
+  var slotScope = el.slotScope === emptySlotScopeToken
+    ? ""
+    : String(el.slotScope);
+  var fn = "function(" + slotScope + "){" +
     "return " + (el.tag === 'template'
       ? el.if && isLegacySyntax
         ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
@@ -4310,7 +4339,14 @@ function genSlot (el, state) {
   var slotName = el.slotName || '"default"';
   var children = genChildren(el, state);
   var res = "_t(" + slotName + (children ? ("," + children) : '');
-  var attrs = el.attrs && ("{" + (el.attrs.map(function (a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
+  var attrs = el.attrs || el.dynamicAttrs
+    ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) { return ({
+        // slot props are camelized
+        name: camelize(attr.name),
+        value: attr.value,
+        dynamic: attr.dynamic
+      }); }))
+    : null;
   var bind$$1 = el.attrsMap['v-bind'];
   if ((attrs || bind$$1) && !children) {
     res += ",null";
diff --git a/packages/vue-template-compiler/package.json b/packages/vue-template-compiler/package.json
index c9f69208b14..7d0354a9e85 100644
--- a/packages/vue-template-compiler/package.json
+++ b/packages/vue-template-compiler/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-template-compiler",
-  "version": "2.6.2",
+  "version": "2.6.3",
   "description": "template compiler for Vue 2.0",
   "main": "index.js",
   "unpkg": "browser.js",