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42 lines (35 loc) · 1.16 KB
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { EventEmitter } from 'events';
export interface Event<T> {
(listener: (e: T) => void): Disposable;
}
export class NodeEventEmitter<T> {
private nodeEmitter = new EventEmitter();
constructor(private register?: { on: () => void; off: () => void }) { }
event: Event<T> = (listener: (e: T) => void): Disposable => {
this.nodeEmitter.on('event', listener);
if (this.register && this.nodeEmitter.listenerCount('event') === 1) {
this.register.on();
}
return {
dispose: () => {
if (this.register && this.nodeEmitter.listenerCount('event') === 1) {
this.register.off();
}
this.nodeEmitter.off('event', listener);
}
};
};
fire(data: T) {
this.nodeEmitter.emit('event', data);
}
dispose() {
this.nodeEmitter.removeAllListeners();
}
}
export interface Disposable {
dispose(): void;
}