64 lines
1.7 KiB
TypeScript
64 lines
1.7 KiB
TypeScript
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {patchEventTarget} from '../common/events';
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Zone.__load_patch('EventEmitter', (global: any) => {
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// For EventEmitter
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const EE_ADD_LISTENER = 'addListener';
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const EE_PREPEND_LISTENER = 'prependListener';
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const EE_REMOVE_LISTENER = 'removeListener';
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const EE_REMOVE_ALL_LISTENER = 'removeAllListeners';
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const EE_LISTENERS = 'listeners';
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const EE_ON = 'on';
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const compareTaskCallbackVsDelegate = function(task: any, delegate: any) {
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// same callback, same capture, same event name, just return
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return task.callback === delegate || task.callback.listener === delegate;
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};
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const eventNameToString = function(eventName: string|Symbol) {
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if (typeof eventName === 'string') {
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return eventName as string;
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}
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if (!eventName) {
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return '';
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}
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return eventName.toString().replace('(', '_').replace(')', '_');
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};
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function patchEventEmitterMethods(obj: any) {
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const result = patchEventTarget(global, [obj], {
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useG: false,
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add: EE_ADD_LISTENER,
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rm: EE_REMOVE_LISTENER,
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prepend: EE_PREPEND_LISTENER,
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rmAll: EE_REMOVE_ALL_LISTENER,
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listeners: EE_LISTENERS,
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chkDup: false,
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rt: true,
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diff: compareTaskCallbackVsDelegate,
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eventNameToString: eventNameToString
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});
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if (result && result[0]) {
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obj[EE_ON] = obj[EE_ADD_LISTENER];
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}
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}
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// EventEmitter
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let events;
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try {
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events = require('events');
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} catch (err) {
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}
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if (events && events.EventEmitter) {
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patchEventEmitterMethods(events.EventEmitter.prototype);
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}
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});
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