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InitializeJavaScriptAppEngine.js
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InitializeJavaScriptAppEngine.js
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/**
* 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.
*
* Sets up global variables typical in most JavaScript environments.
*
* 1. Global timers (via `setTimeout` etc).
* 2. Global console object.
* 3. Hooks for printing stack traces with source maps.
*
* Leaves enough room in the environment for implementing your own:
* 1. Require system.
* 2. Bridged modules.
*
* @providesModule InitializeJavaScriptAppEngine
*/
/* eslint strict: 0 */
/* globals GLOBAL: true, window: true */
require('regenerator/runtime');
if (typeof GLOBAL === 'undefined') {
GLOBAL = this;
}
if (typeof window === 'undefined') {
window = GLOBAL;
}
function setUpConsole() {
// ExceptionsManager transitively requires Promise so we install it after
var ExceptionsManager = require('ExceptionsManager');
ExceptionsManager.installConsoleErrorReporter();
}
/**
* Assigns a new global property, replacing the existing one if there is one.
*
* Existing properties are preserved as `originalPropertyName`. Both properties
* will maintain the same enumerability & configurability.
*
* This allows you to undo the more aggressive polyfills, should you need to.
* For example, if you want to route network requests through DevTools (to trace
* them):
*
* global.XMLHttpRequest = global.originalXMLHttpRequest;
*
* For more info on that particular case, see:
* https://github.com/facebook/react-native/issues/934
*/
function polyfillGlobal(name, newValue, scope = GLOBAL) {
var descriptor = Object.getOwnPropertyDescriptor(scope, name) || {
// jest for some bad reasons runs the polyfill code multiple times. In jest
// environment, XmlHttpRequest doesn't exist so getOwnPropertyDescriptor
// returns undefined and defineProperty default for writable is false.
// Therefore, the second time it runs, defineProperty will fatal :(
writable: true,
};
if (scope[name] !== undefined) {
var backupName = `original${name[0].toUpperCase()}${name.substr(1)}`;
Object.defineProperty(scope, backupName, {...descriptor, value: scope[name]});
}
Object.defineProperty(scope, name, {...descriptor, value: newValue});
}
function setUpErrorHandler() {
if (global.__fbDisableExceptionsManager) {
return;
}
function handleError(e, isFatal) {
try {
require('ExceptionsManager').handleException(e, isFatal);
} catch(ee) {
console.log('Failed to print error: ', ee.message);
}
}
var ErrorUtils = require('ErrorUtils');
ErrorUtils.setGlobalHandler(handleError);
}
function setUpFlowChecker() {
if (__DEV__) {
var checkFlowAtRuntime = require('checkFlowAtRuntime');
checkFlowAtRuntime();
}
}
/**
* Sets up a set of window environment wrappers that ensure that the
* BatchedBridge is flushed after each tick. In both the case of the
* `UIWebView` based `RCTJavaScriptCaller` and `RCTContextCaller`, we
* implement our own custom timing bridge that should be immune to
* unexplainably dropped timing signals.
*/
function setUpTimers() {
var JSTimers = require('JSTimers');
GLOBAL.setTimeout = JSTimers.setTimeout;
GLOBAL.setInterval = JSTimers.setInterval;
GLOBAL.setImmediate = JSTimers.setImmediate;
GLOBAL.clearTimeout = JSTimers.clearTimeout;
GLOBAL.clearInterval = JSTimers.clearInterval;
GLOBAL.clearImmediate = JSTimers.clearImmediate;
GLOBAL.cancelAnimationFrame = JSTimers.clearInterval;
GLOBAL.requestAnimationFrame = function(cb) {
/*requestAnimationFrame() { [native code] };*/ // Trick scroller library
return JSTimers.requestAnimationFrame(cb); // into thinking it's native
};
}
function setUpAlert() {
var RCTAlertManager = require('NativeModules').AlertManager;
if (!GLOBAL.alert) {
GLOBAL.alert = function(text) {
var alertOpts = {
title: 'Alert',
message: '' + text,
buttons: [{'cancel': 'OK'}],
};
RCTAlertManager.alertWithArgs(alertOpts, function () {});
};
}
}
function setUpPromise() {
// The native Promise implementation throws the following error:
// ERROR: Event loop not supported.
GLOBAL.Promise = require('Promise');
}
function setUpXHR() {
// The native XMLHttpRequest in Chrome dev tools is CORS aware and won't
// let you fetch anything from the internet
polyfillGlobal('XMLHttpRequest', require('XMLHttpRequest'));
polyfillGlobal('FormData', require('FormData'));
var fetchPolyfill = require('fetch');
polyfillGlobal('fetch', fetchPolyfill.fetch);
polyfillGlobal('Headers', fetchPolyfill.Headers);
polyfillGlobal('Request', fetchPolyfill.Request);
polyfillGlobal('Response', fetchPolyfill.Response);
}
function setUpGeolocation() {
GLOBAL.navigator = GLOBAL.navigator || {};
polyfillGlobal('geolocation', require('Geolocation'), GLOBAL.navigator);
}
function setUpProduct() {
Object.defineProperty(GLOBAL.navigator, 'product', {value: 'ReactNative'});
}
function setUpWebSockets() {
polyfillGlobal('WebSocket', require('WebSocket'));
}
function setUpProfile() {
if (__DEV__) {
var Systrace = require('Systrace');
Systrace.swizzleReactPerf();
}
}
function setUpProcessEnv() {
GLOBAL.process = GLOBAL.process || {};
GLOBAL.process.env = GLOBAL.process.env || {};
if (!GLOBAL.process.env.NODE_ENV) {
GLOBAL.process.env.NODE_ENV = __DEV__ ? 'development' : 'production';
}
}
function setUpNumber() {
Number.EPSILON = Number.EPSILON || Math.pow(2, -52);
Number.MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER || Math.pow(2, 53) - 1;
Number.MIN_SAFE_INTEGER = Number.MIN_SAFE_INTEGER || -(Math.pow(2, 53) - 1);
}
function setUpDevTools() {
// not when debugging in chrome
if (__DEV__) { // TODO(9123099) Strip `__DEV__ &&`
if (!window.document && require('Platform').OS === 'ios') {
var setupDevtools = require('setupDevtools');
setupDevtools();
}
}
}
setUpProcessEnv();
setUpConsole();
setUpTimers();
setUpAlert();
setUpPromise();
setUpErrorHandler();
setUpXHR();
setUpGeolocation();
setUpProduct();
setUpWebSockets();
setUpProfile();
setUpFlowChecker();
setUpNumber();
setUpDevTools();
// Just to make sure the JS gets packaged up. Wait until the JS environment has
// been initialized before requiring them.
if (__DEV__) {
require('RCTDebugComponentOwnership');
}
require('RCTDeviceEventEmitter');
require('PerformanceLogger');
if (__DEV__) {
// include this transform and it's dependencies on the bundle on dev mode
require('react-transform-hmr');
}