@webcomponents/custom-elements/src/Deferred.js

HTML Custom Elements Polyfill

/**
 * @license
 * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */
export default class Deferred {
    constructor() {
        this._value = undefined;
        this._promise = new Promise((resolve) => {
            this._resolve = resolve;
        });
    }
    resolve(value) {
        if (this._value) {
            throw new Error('Already resolved.');
        }
        this._value = value;
        this._resolve(value);
    }
    toPromise() {
        return this._promise;
    }
}
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