51 lines
1.7 KiB
TypeScript
51 lines
1.7 KiB
TypeScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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* Modifications copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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type EventEmitterLike = {
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on(eventName: string | symbol, handler: (...args: any[]) => unknown): unknown;
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removeListener(eventName: string | symbol, handler: (...args: any[]) => unknown): unknown;
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};
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export type RegisteredListener = {
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emitter: EventEmitterLike;
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eventName: (string | symbol);
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handler: (...args: any[]) => void;
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dispose: () => Promise<void>;
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};
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class EventsHelper {
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static addEventListener(
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emitter: EventEmitterLike,
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eventName: (string | symbol),
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handler: (...args: any[]) => void): RegisteredListener {
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emitter.on(eventName, handler);
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return { emitter, eventName, handler, dispose: async () => { emitter.removeListener(eventName, handler); } };
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}
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static removeEventListeners(listeners: Array<{
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emitter: EventEmitterLike;
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eventName: (string | symbol);
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handler: (...args: any[]) => void;
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}>) {
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for (const listener of listeners)
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listener.emitter.removeListener(listener.eventName, listener.handler);
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listeners.splice(0, listeners.length);
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}
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}
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export const eventsHelper = EventsHelper;
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