Deferred.js•2.12 kB
"use strict";
/**
* Copyright 2022 Google LLC.
* Copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.Deferred = void 0;
class Deferred {
#isFinished = false;
#promise;
#result;
#resolve;
#reject;
get isFinished() {
return this.#isFinished;
}
get result() {
if (!this.#isFinished) {
throw new Error('Deferred is not finished yet');
}
return this.#result;
}
constructor() {
this.#promise = new Promise((resolve, reject) => {
this.#resolve = resolve;
this.#reject = reject;
});
// Needed to avoid `Uncaught (in promise)`. The promises returned by `then`
// and `catch` will be rejected anyway.
this.#promise.catch((_error) => {
// Intentionally empty.
});
}
then(onFulfilled, onRejected) {
return this.#promise.then(onFulfilled, onRejected);
}
catch(onRejected) {
return this.#promise.catch(onRejected);
}
resolve(value) {
this.#result = value;
if (!this.#isFinished) {
this.#isFinished = true;
this.#resolve(value);
}
}
reject(reason) {
if (!this.#isFinished) {
this.#isFinished = true;
this.#reject(reason);
}
}
finally(onFinally) {
return this.#promise.finally(onFinally);
}
[Symbol.toStringTag] = 'Promise';
}
exports.Deferred = Deferred;
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