gecko-dev/devtools/shared/defer.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

// See bug 1273941 to understand this choice of promise.
const Promise = require("promise");

/**
 * Returns a deferred object, with a resolve and reject property.
 * https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/Promise.jsm/Deferred
 */
module.exports = function defer() {
  let resolve, reject;
  let promise = new Promise(function () {
    resolve = arguments[0];
    reject = arguments[1];
  });
  return {
    resolve,
    reject,
    promise
  };
};