rxjs 6 compat, prettier, jest

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "semi": false,
+  "tabs": 2,
+  "singleQuote": true
+}

index.d.ts

@@ -0,0 +1,11 @@
+declare module 'static-observable' {
+  import { Observable } from 'rxjs'
+
+  export default class StaticObservable<ValueType> extends Observable<
+    ValueType
+  > {
+    next(val: ValueType): void
+    error(error: Error): void
+    complete(): void
+  }
+}

index.js

@@ -1,7 +1,3 @@
-'use strict'
-
-var util = require('util')
-
 var Observable = require('rxjs/Observable').Observable
 var Subscription = require('rxjs/Subscription').Subscription
 
@@ -10,12 +6,12 @@ module.exports = StaticObservable
 /**
  * @class StaticObservable
  */
-function StaticObservable () {
+function StaticObservable() {
   Observable.call(this, subscribe)
   var self = this
   this._observer = null
   this._observerCalls = []
-  function subscribe (observer) {
+  function subscribe(observer) {
     self._observer = observer
     while (self._observerCalls.length) {
       var call = self._observerCalls.shift()
@@ -25,9 +21,6 @@ function StaticObservable () {
   }
 }
 
-// inherit from observable
-util.inherits(StaticObservable, Observable)
-
 /**
  * StaticObservable factories
  */
@@ -37,7 +30,7 @@ util.inherits(StaticObservable, Observable)
  * @param  {*} next  observable next value
  * @return {Observable} observable
  */
-StaticObservable.next = function () {
+StaticObservable.next = function() {
   var observable = new StaticObservable()
   return observable.next.apply(observable, arguments)
 }
@@ -47,7 +40,7 @@ StaticObservable.next = function () {
  * @param  {Error} error  observable error
  * @return {Observable} observable
  */
-StaticObservable.error = function () {
+StaticObservable.error = function() {
   var observable = new StaticObservable()
   return observable.error.apply(observable, arguments)
 }
@@ -56,11 +49,14 @@ StaticObservable.error = function () {
  * returns an Observable that is immediately "completed"
  * @return {Observable} observable
  */
-StaticObservable.complete = function () {
+StaticObservable.complete = function() {
   var observable = new StaticObservable()
   return observable.complete.apply(observable, arguments)
 }
 
+// inherit from observable
+StaticObservable.prototype = Object.create(Observable.prototype)
+
 /**
  * Chainable instance methods
  */
@@ -71,8 +67,8 @@ StaticObservable.prototype.error = observerCall('error')
 
 StaticObservable.prototype.complete = observerCall('complete')
 
-function observerCall (method) {
-  return function () {
+function observerCall(method) {
+  return function() {
     var _observer = this._observer
     if (_observer) {
       _observer[method].apply(_observer, arguments)
@@ -84,4 +80,4 @@ function observerCall (method) {
     }
     return this
   }
-}
+}

jest.config.json

@@ -0,0 +1,3 @@
+{
+  "resetMocks": true
+}