diff --git a/.travis.yml b/.travis.yml
index f87f976f..6f2b570e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,9 +7,6 @@ node_js:
   - "6"
   - "7"
   - "8"
-cache:
-  directories:
-    - node_modules
 
 before_install:
   - npm install -g npm@latest
diff --git a/lib/binding.js b/lib/binding.js
index 17455dad..b20855ec 100644
--- a/lib/binding.js
+++ b/lib/binding.js
@@ -250,7 +250,7 @@ Binding.prototype.realpath = function(filepath, encoding, callback) {
     var item = this._system.getRoot();
     var itemPath = '/';
     var name, i, ii;
-    for ((i = 0), (ii = parts.length); i < ii; ++i) {
+    for (i = 0, ii = parts.length; i < ii; ++i) {
       name = parts[i];
       while (item instanceof SymbolicLink) {
         itemPath = path.resolve(path.dirname(itemPath), item.getPath());
diff --git a/lib/filesystem.js b/lib/filesystem.js
index dc90c063..c7fedba3 100644
--- a/lib/filesystem.js
+++ b/lib/filesystem.js
@@ -57,7 +57,7 @@ function FileSystem(options) {
     var parts = getPathParts(dir);
     var directory = root;
     var i, ii, name, candidate;
-    for ((i = 0), (ii = parts.length); i < ii; ++i) {
+    for (i = 0, ii = parts.length; i < ii; ++i) {
       name = parts[i];
       candidate = directory.getItem(name);
       if (!candidate) {
@@ -176,7 +176,7 @@ FileSystem.create = function(paths, options) {
     var parts = getPathParts(filepath);
     var directory = system._root;
     var i, ii, name, candidate;
-    for ((i = 0), (ii = parts.length - 1); i < ii; ++i) {
+    for (i = 0, ii = parts.length - 1; i < ii; ++i) {
       name = parts[i];
       candidate = directory.getItem(name);
       if (!candidate) {
diff --git a/package-lock.json b/package-lock.json
index 264f7b15..1d6cf59c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2,395 +2,576 @@
   "name": "mock-fs",
   "version": "4.4.1",
   "lockfileVersion": 1,
+  "requires": true,
   "dependencies": {
     "acorn": {
-      "version": "https://registry.npmjs.org/acorn/-/acorn-3.2.0.tgz",
-      "integrity": "sha1-eoKYnvbwY6I3q6uvjfINKWUYS58=",
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.1.2.tgz",
+      "integrity": "sha512-o96FZLJBPY1lvTuJylGA9Bk3t/GKPPJG8H0ydQQl01crzwJgspa4AEIq/pVTXigmK0PHVQhiAtn8WMBLL9D2WA==",
       "dev": true
     },
     "acorn-jsx": {
-      "version": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "acorn": "3.3.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
     },
     "ajv": {
-      "version": "https://registry.npmjs.org/ajv/-/ajv-4.11.2.tgz",
-      "integrity": "sha1-8WbDwRy8bLncwQKlvP5bcslSh+Y=",
-      "dev": true
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.2.3.tgz",
+      "integrity": "sha1-wG9Zh3jETGsWGrr+NGa4GtGBTtI=",
+      "dev": true,
+      "requires": {
+        "co": "4.6.0",
+        "fast-deep-equal": "1.0.0",
+        "json-schema-traverse": "0.3.1",
+        "json-stable-stringify": "1.0.1"
+      }
     },
     "ajv-keywords": {
-      "version": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
-      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.0.tgz",
+      "integrity": "sha1-opbhf3v658HOT34N5T0pyzIWLfA=",
       "dev": true
     },
     "ansi-escapes": {
-      "version": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
-      "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.0.0.tgz",
+      "integrity": "sha512-O/klc27mWNUigtv0F8NJWbLF00OcegQalkqKURWdosW08YZKi4m6CnSUSvIZG1otNJbTWhN01Hhz389DW7mvDQ==",
       "dev": true
     },
     "ansi-regex": {
-      "version": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz",
-      "integrity": "sha1-xQYbbg74qBd15Q9dZhUb9r83EQc=",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
       "dev": true
     },
     "ansi-styles": {
-      "version": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.0.tgz",
-      "integrity": "sha1-xZGRk25u0cExWktra5fzrPv6aLA=",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
     "argparse": {
-      "version": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
       "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
-      "dev": true
+      "dev": true,
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+      }
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-      "integrity": "sha1-TUEPyDlcskdjcSS63p4/VH1dVfI=",
-      "dev": true
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
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+      }
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     "array-uniq": {
-      "version": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.2.tgz",
-      "integrity": "sha1-X8w3OSB3VyPP1k1lxkvvU7+eum0=",
+      "version": "1.0.3",
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+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
       "dev": true
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     "arrify": {
-      "version": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "version": "1.0.1",
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-      "integrity": "sha1-bLakC+ujH0nyCSjihDn8FKPasHg=",
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-      "integrity": "sha1-K9xa42YEFELCfgaMzm8NfAbqmUk=",
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+      "version": "6.26.0",
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+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
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+        "chalk": "1.1.3",
+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
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+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "2.2.1",
+            "escape-string-regexp": "1.0.5",
+            "has-ansi": "2.0.0",
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+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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diff --git a/package.json b/package.json
index d5cdc5de..b410de59 100644
--- a/package.json
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