angular-cn/packages/zone.js/lib/node/events.ts

64 lines
1.7 KiB
TypeScript

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