Added stubs for some native modules

Reviewed By: javache

Differential Revision: D5111649

fbshipit-source-id: eef2f84556611dec01978d845b89fa145ec5d4db

Libraries/AppState/AppState.js

@@ -11,7 +11,7 @@
  */
 'use strict';
 
-const EventEmitter = require('EventEmitter');
+const MissingNativeEventEmitterShim = require('MissingNativeEventEmitterShim');
 const NativeEventEmitter = require('NativeEventEmitter');
 const NativeModules = require('NativeModules');
 const RCTAppState = NativeModules.AppState;
@@ -87,7 +87,7 @@ class AppState extends NativeEventEmitter {
 
   _eventHandlers: Object;
   currentState: ?string;
-  isAvailable: boolean;
+  isAvailable: boolean = true;
 
   constructor() {
     super(RCTAppState);
@@ -176,48 +176,31 @@ class AppState extends NativeEventEmitter {
   }
 }
 
-function throwMissingNativeModule() {
-  invariant(
-    false,
-    'Cannot use AppState module when native RCTAppState is not included in the build.\n' +
-    'Either include it, or check AppState.isAvailable before calling any methods.'
-  );
+if (__DEV__ && !RCTAppState) {
+  class MissingNativeAppStateShim extends MissingNativeEventEmitterShim {
+    constructor() {
+      super('RCTAppState', 'AppState');
     }
 
-class MissingNativeAppStateShim extends EventEmitter {
-  // AppState
-  isAvailable: boolean = false;
-  currentState: ?string = null;
-
-  addEventListener() {
-    throwMissingNativeModule();
+    get currentState(): ?string {
+      this.throwMissingNativeModule();
     }
 
-  removeEventListener() {
-    throwMissingNativeModule();
+    addEventListener(...args: Array<any>) {
+      this.throwMissingNativeModule();
     }
 
-  // EventEmitter
-  addListener() {
-    throwMissingNativeModule();
-  }
-
-  removeAllListeners() {
-    throwMissingNativeModule();
-  }
-
-  removeSubscription() {
-    throwMissingNativeModule();
+    removeEventListener(...args: Array<any>) {
+      this.throwMissingNativeModule();
     }
   }
 
   // This module depends on the native `RCTAppState` module. If you don't include it,
   // `AppState.isAvailable` will return `false`, and any method calls will throw.
   // We reassign the class variable to keep the autodoc generator happy.
-if (RCTAppState) {
-  AppState = new AppState();
-} else {
   AppState = new MissingNativeAppStateShim();
+} else {
+  AppState = new AppState();
 }
 
 module.exports = AppState;

Libraries/Core/Devtools/setupDevtools.js

@@ -13,9 +13,12 @@
 
 if (__DEV__) {
   const AppState = require('AppState');
+  const WebSocket = require('WebSocket');
   const {PlatformConstants} = require('NativeModules');
   const {connectToDevTools} = require('react-devtools-core');
 
+  // Initialize dev tools only if the native module for WebSocket is available
+  if (WebSocket.isAvailable) {
     connectToDevTools({
       isAppActive() {
         // Don't steal the DevTools from currently active app.
@@ -34,3 +37,4 @@ if (__DEV__) {
       resolveRNStyle: require('flattenStyle'),
     });
   }
+}

Libraries/EventEmitter/MissingNativeEventEmitterShim.js

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule MissingNativeEventEmitterShim
+ * @flow
+ */
+'use strict';
+
+const EmitterSubscription = require('EmitterSubscription');
+const EventEmitter = require('EventEmitter');
+
+const invariant = require('fbjs/lib/invariant');
+
+class MissingNativeEventEmitterShim extends EventEmitter {
+  isAvailable: boolean = false;
+  _nativeModuleName: string;
+  _nativeEventEmitterName: string;
+
+  constructor(nativeModuleName: string, nativeEventEmitterName: string) {
+    super(null);
+    this._nativeModuleName = nativeModuleName;
+    this._nativeEventEmitterName = nativeEventEmitterName;
+  }
+
+  throwMissingNativeModule() {
+    invariant(
+      false,
+      `Cannot use '${this._nativeEventEmitterName}' module when ` +
+      `native '${this._nativeModuleName}' is not included in the build. ` +
+      `Either include it, or check '${this._nativeEventEmitterName}'.isAvailable ` +
+      'before calling any methods.'
+    );
+  }
+
+  // EventEmitter
+  addListener(eventType: string, listener: Function, context: ?Object): EmitterSubscription {
+    this.throwMissingNativeModule();
+  }
+
+  removeAllListeners(eventType: string) {
+    this.throwMissingNativeModule();
+  }
+
+  removeSubscription(subscription: EmitterSubscription) {
+    this.throwMissingNativeModule();
+  }
+}
+
+module.exports = MissingNativeEventEmitterShim;

Libraries/EventEmitter/NativeEventEmitter.js

@@ -23,7 +23,6 @@ import type EmitterSubscription from 'EmitterSubscription';
  * a subset of the standard EventEmitter node module API.
  */
 class NativeEventEmitter extends EventEmitter {
-
   _nativeModule: Object;
 
   constructor(nativeModule: Object) {

Libraries/Network/RCTNetworking.android.js

@@ -13,7 +13,7 @@
 
 // Do not require the native RCTNetworking module directly! Use this wrapper module instead.
 // It will add the necessary requestId, so that you don't have to generate it yourself.
-const FormData = require('FormData');
+const MissingNativeEventEmitterShim = require('MissingNativeEventEmitterShim');
 const NativeEventEmitter = require('NativeEventEmitter');
 const RCTNetworkingNative = require('NativeModules').Networking;
 const convertRequestBody = require('convertRequestBody');
@@ -43,6 +43,8 @@ function generateRequestId(): number {
  */
 class RCTNetworking extends NativeEventEmitter {
 
+  isAvailable: boolean = true;
+
   constructor() {
     super(RCTNetworkingNative);
   }
@@ -90,4 +92,31 @@ class RCTNetworking extends NativeEventEmitter {
   }
 }
 
-module.exports = new RCTNetworking();
+if (__DEV__ && !RCTNetworkingNative) {
+  class MissingNativeRCTNetworkingShim extends MissingNativeEventEmitterShim {
+    constructor() {
+      super('RCTAppState', 'AppState');
+    }
+
+    sendRequest(...args: Array<any>) {
+      this.throwMissingNativeModule();
+    }
+
+    abortRequest(...args: Array<any>) {
+      this.throwMissingNativeModule();
+    }
+
+    clearCookies(...args: Array<any>) {
+      this.throwMissingNativeModule();
+    }
+  }
+
+  // This module depends on the native `RCTNetworkingNative` module. If you don't include it,
+  // `RCTNetworking.isAvailable` will return `false`, and any method calls will throw.
+  // We reassign the class variable to keep the autodoc generator happy.
+  RCTNetworking = new MissingNativeRCTNetworkingShim();
+} else {
+  RCTNetworking = new RCTNetworking();
+}
+
+module.exports = RCTNetworking;

Libraries/Network/RCTNetworking.ios.js

@@ -11,7 +11,7 @@
  */
 'use strict';
 
-const FormData = require('FormData');
+const MissingNativeEventEmitterShim = require('MissingNativeEventEmitterShim');
 const NativeEventEmitter = require('NativeEventEmitter');
 const RCTNetworkingNative = require('NativeModules').Networking;
 const convertRequestBody = require('convertRequestBody');
@@ -20,6 +20,8 @@ import type {RequestBody} from 'convertRequestBody';
 
 class RCTNetworking extends NativeEventEmitter {
 
+  isAvailable: boolean = true;
+
   constructor() {
     super(RCTNetworkingNative);
   }
@@ -58,4 +60,31 @@ class RCTNetworking extends NativeEventEmitter {
   }
 }
 
-module.exports = new RCTNetworking();
+if (__DEV__ && !RCTNetworkingNative) {
+  class MissingNativeRCTNetworkingShim extends MissingNativeEventEmitterShim {
+    constructor() {
+      super('RCTAppState', 'AppState');
+    }
+
+    sendRequest(...args: Array<any>) {
+      this.throwMissingNativeModule();
+    }
+
+    abortRequest(...args: Array<any>) {
+      this.throwMissingNativeModule();
+    }
+
+    clearCookies(...args: Array<any>) {
+      this.throwMissingNativeModule();
+    }
+  }
+
+  // This module depends on the native `RCTNetworkingNative` module. If you don't include it,
+  // `RCTNetworking.isAvailable` will return `false`, and any method calls will throw.
+  // We reassign the class variable to keep the autodoc generator happy.
+  RCTNetworking = new MissingNativeRCTNetworkingShim();
+} else {
+  RCTNetworking = new RCTNetworking();
+}
+
+module.exports = RCTNetworking;

Libraries/WebSocket/WebSocket.js

@@ -71,6 +71,10 @@ class WebSocket extends EventTarget(...WEBSOCKET_EVENTS) {
   readyState: number = CONNECTING;
   url: ?string;
 
+  // This module depends on the native `RCTWebSocketModule` module. If you don't include it,
+  // `WebSocket.isAvailable` will return `false`, and WebSocket constructor will throw an error
+  static isAvailable: boolean = !!RCTWebSocketModule;
+
   constructor(url: string, protocols: ?string | ?Array<string>, options: ?{origin?: string}) {
     super();
     if (typeof protocols === 'string') {
@@ -81,6 +85,11 @@ class WebSocket extends EventTarget(...WEBSOCKET_EVENTS) {
       protocols = null;
     }
 
+    if (!WebSocket.isAvailable) {
+      throw new Error('Cannot initialize WebSocket module. ' +
+      'Native module RCTWebSocketModule is missing.');
+    }
+
     this._eventEmitter = new NativeEventEmitter(RCTWebSocketModule);
     this._socketId = nextWebSocketId++;
     this._registerEvents();