67 lines
2.0 KiB
JavaScript
67 lines
2.0 KiB
JavaScript
/**
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* Copyright 2022 Google LLC.
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* 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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export class Deferred {
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#isFinished = false;
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#promise;
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#result;
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#resolve;
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#reject;
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get isFinished() {
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return this.#isFinished;
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}
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get result() {
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if (!this.#isFinished) {
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throw new Error('Deferred is not finished yet');
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}
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return this.#result;
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}
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constructor() {
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this.#promise = new Promise((resolve, reject) => {
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this.#resolve = resolve;
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this.#reject = reject;
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});
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// Needed to avoid `Uncaught (in promise)`. The promises returned by `then`
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// and `catch` will be rejected anyway.
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this.#promise.catch((_error) => {
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// Intentionally empty.
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});
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}
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then(onFulfilled, onRejected) {
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return this.#promise.then(onFulfilled, onRejected);
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}
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catch(onRejected) {
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return this.#promise.catch(onRejected);
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}
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resolve(value) {
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this.#result = value;
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if (!this.#isFinished) {
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this.#isFinished = true;
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this.#resolve(value);
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}
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}
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reject(reason) {
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if (!this.#isFinished) {
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this.#isFinished = true;
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this.#reject(reason);
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}
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}
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finally(onFinally) {
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return this.#promise.finally(onFinally);
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}
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[Symbol.toStringTag] = 'Promise';
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}
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//# sourceMappingURL=Deferred.js.map
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