| 1 | ;
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| 2 | /*! *****************************************************************************
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| 3 | Copyright (c) Microsoft Corporation.
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| 4 | Licensed under the Apache License, Version 2.0.
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| 5 |
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| 6 | See LICENSE file in the project root for details.
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| 7 | ***************************************************************************** */
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| 8 | Object.defineProperty(exports, "__esModule", { value: true });
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| 9 | /**
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| 10 | * Encapsulates a Promise and exposes its resolve and reject callbacks.
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| 11 | */
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| 12 | class Deferred {
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| 13 | /**
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| 14 | * Initializes a new instance of the Deferred class.
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| 15 | */
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| 16 | constructor() {
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| 17 | this._promise = new Promise((resolve, reject) => {
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| 18 | this._resolve = resolve;
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| 19 | this._reject = reject;
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| 20 | });
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| 21 | }
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| 22 | /**
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| 23 | * Gets the promise.
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| 24 | */
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| 25 | get promise() {
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| 26 | return this._promise;
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| 27 | }
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| 28 | /**
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| 29 | * Gets the callback used to resolve the promise.
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| 30 | */
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| 31 | get resolve() { return this._resolve; }
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| 32 | /**
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| 33 | * Gets the callback used to reject the promise.
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| 34 | */
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| 35 | get reject() { return this._reject; }
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| 36 | /**
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| 37 | * Gets a NodeJS-style callback that can be used to resolve or reject the promise.
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| 38 | */
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| 39 | get callback() {
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| 40 | if (!this._callback) {
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| 41 | this._callback = this.createCallback(identity);
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| 42 | }
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| 43 | return this._callback;
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| 44 | }
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| 45 | /**
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| 46 | * Creates a NodeJS-style callback that can be used to resolve or reject the promise with multiple values.
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| 47 | */
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| 48 | createCallback(selector) {
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| 49 | return (err, ...args) => {
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| 50 | if (err !== null && err !== undefined) {
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| 51 | this._reject(err);
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| 52 | }
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| 53 | else {
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| 54 | this._resolve(selector(...args));
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| 55 | }
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| 56 | };
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| 57 | }
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| 58 | }
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| 59 | exports.Deferred = Deferred;
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| 60 | function identity(value) { return value; }
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