graphql/jsutils/promiseForObject.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = promiseForObject;

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 *  strict
 */

/**
 * This function transforms a JS object `ObjMap<Promise<T>>` into
 * a `Promise<ObjMap<T>>`
 *
 * This is akin to bluebird's `Promise.props`, but implemented only using
 * `Promise.all` so it will work with any implementation of ES6 promises.
 */
function promiseForObject(object) {
  var keys = Object.keys(object);
  var valuesAndPromises = keys.map(function (name) {
    return object[name];
  });
  return Promise.all(valuesAndPromises).then(function (values) {
    return values.reduce(function (resolvedObject, value, i) {
      resolvedObject[keys[i]] = value;
      return resolvedObject;
    }, Object.create(null));
  });
}