0675dd924d
Reviewed By: passy Differential Revision: D17863711 fbshipit-source-id: 259dc77826fb803ff1b88c88529d7f679d3b74d8
39 lines
788 B
TypeScript
39 lines
788 B
TypeScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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*/
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import {CancelledPromiseError} from './errors';
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export class Idler {
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lastIdle: number;
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interval: number;
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kill: boolean;
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constructor() {
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this.lastIdle = 0;
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this.interval = 3;
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this.kill = false;
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}
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idle(): Promise<void> {
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if (this.kill) {
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throw new CancelledPromiseError('Idler got killed');
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}
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const now = performance.now();
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if (now - this.lastIdle > this.interval) {
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this.lastIdle = now;
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return new Promise(resolve => setTimeout(resolve, 0));
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}
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return Promise.resolve();
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}
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cancel() {
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this.kill = true;
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}
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}
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