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InitializeCore.js
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InitializeCore.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.
*
* @providesModule InitializeCore
* @flow
*/
/* eslint-disable strict */
/* globals window: true */
/**
* 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.
*
*/
'use strict';
if (global.GLOBAL === undefined) {
global.GLOBAL = global;
}
if (global.window === undefined) {
global.window = global;
}
const defineLazyObjectProperty = require('defineLazyObjectProperty');
/**
* Sets an object's property. If a property with the same name exists, this will
* replace it but maintain its descriptor configuration. By default, the property
* will replaced with a lazy getter.
*
* The original property value will be preserved as `original[PropertyName]` so
* that, if necessary, it can be restored. For example, if you want to route
* network requests through DevTools (to trace them):
*
* global.XMLHttpRequest = global.originalXMLHttpRequest;
*
* @see https://github.com/facebook/react-native/issues/934
*/
function defineProperty<T>(
object: Object,
name: string,
getValue: () => T,
eager?: boolean
): void {
const descriptor = Object.getOwnPropertyDescriptor(object, name);
if (descriptor) {
const backupName = `original${name[0].toUpperCase()}${name.substr(1)}`;
Object.defineProperty(object, backupName, {
...descriptor,
value: object[name],
});
}
const {enumerable, writable, configurable} = descriptor || {};
if (descriptor && !configurable) {
console.error('Failed to set polyfill. ' + name + ' is not configurable.');
return;
}
if (eager === true) {
Object.defineProperty(object, name, {
configurable: true,
enumerable: enumerable !== false,
writable: writable !== false,
value: getValue(),
});
} else {
defineLazyObjectProperty(object, name, {
get: getValue,
enumerable: enumerable !== false,
writable: writable !== false,
});
}
}
// Set up process
global.process = global.process || {};
global.process.env = global.process.env || {};
if (!global.process.env.NODE_ENV) {
global.process.env.NODE_ENV = __DEV__ ? 'development' : 'production';
}
// Set up profile
const Systrace = require('Systrace');
Systrace.setEnabled(global.__RCTProfileIsProfiling || false);
// Set up console
const ExceptionsManager = require('ExceptionsManager');
ExceptionsManager.installConsoleErrorReporter();
// TODO: Move these around to solve the cycle in a cleaner way
const BatchedBridge = require('BatchedBridge');
BatchedBridge.registerCallableModule('Systrace', require('Systrace'));
BatchedBridge.registerCallableModule('JSTimersExecution', require('JSTimersExecution'));
BatchedBridge.registerCallableModule('HeapCapture', require('HeapCapture'));
BatchedBridge.registerCallableModule('SamplingProfiler', require('SamplingProfiler'));
if (__DEV__) {
BatchedBridge.registerCallableModule('HMRClient', require('HMRClient'));
}
// RCTLog needs to register with BatchedBridge
require('RCTLog');
// Set up error handler
if (!global.__fbDisableExceptionsManager) {
const handleError = (e, isFatal) => {
try {
ExceptionsManager.handleException(e, isFatal);
} catch (ee) {
/* eslint-disable no-console-disallow */
console.log('Failed to print error: ', ee.message);
/* eslint-enable no-console-disallow */
throw e;
}
};
const ErrorUtils = require('ErrorUtils');
ErrorUtils.setGlobalHandler(handleError);
}
// Set up timers
const defineLazyTimer = name => {
defineProperty(global, name, () => require('JSTimers')[name]);
};
defineLazyTimer('setTimeout');
defineLazyTimer('setInterval');
defineLazyTimer('setImmediate');
defineLazyTimer('clearTimeout');
defineLazyTimer('clearInterval');
defineLazyTimer('clearImmediate');
defineLazyTimer('requestAnimationFrame');
defineLazyTimer('cancelAnimationFrame');
defineLazyTimer('requestIdleCallback');
defineLazyTimer('cancelIdleCallback');
// Set up alert
if (!global.alert) {
global.alert = function(text) {
// Require Alert on demand. Requiring it too early can lead to issues
// with things like Platform not being fully initialized.
require('Alert').alert('Alert', '' + text);
};
}
// Set up Promise
// The native Promise implementation throws the following error:
// ERROR: Event loop not supported.
defineProperty(global, 'Promise', () => require('Promise'));
// Set up regenerator.
defineProperty(global, 'regeneratorRuntime', () => {
// The require just sets up the global, so make sure when we first
// invoke it the global does not exist
delete global.regeneratorRuntime;
require('regenerator-runtime/runtime');
return global.regeneratorRuntime;
});
// Set up XHR
// The native XMLHttpRequest in Chrome dev tools is CORS aware and won't
// let you fetch anything from the internet
defineProperty(global, 'XMLHttpRequest', () => require('XMLHttpRequest'));
defineProperty(global, 'FormData', () => require('FormData'));
defineProperty(global, 'fetch', () => require('fetch').fetch);
defineProperty(global, 'Headers', () => require('fetch').Headers);
defineProperty(global, 'Request', () => require('fetch').Request);
defineProperty(global, 'Response', () => require('fetch').Response);
defineProperty(global, 'WebSocket', () => require('WebSocket'));
// Set up Geolocation
let navigator = global.navigator;
if (navigator === undefined) {
global.navigator = navigator = {};
}
// see https://github.com/facebook/react-native/issues/10881
defineProperty(navigator, 'product', () => 'ReactNative', true);
defineProperty(navigator, 'geolocation', () => require('Geolocation'));
// Set up collections
// We can't make these lazy because `Map` checks for `global.Map` (which wouldc
// not exist if it were lazily defined).
defineProperty(global, 'Map', () => require('Map'), true);
defineProperty(global, 'Set', () => require('Set'), true);
// Set up devtools
if (__DEV__) {
// not when debugging in chrome
// TODO(t12832058) This check is broken
if (!window.document) {
require('setupDevtools');
}
require('RCTDebugComponentOwnership');
}
// Set up inspector
if (__DEV__) {
const JSInspector = require('JSInspector');
JSInspector.registerAgent(require('NetworkAgent'));
}
// Just to make sure the JS gets packaged up. Wait until the JS environment has
// been initialized before requiring them.
require('RCTDeviceEventEmitter');
require('RCTNativeAppEventEmitter');
require('PerformanceLogger');