text: /**
   * @license
   * Copyright (c) 2017 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
   *
   * @fileoverview Symbols needed to compile webcomponents
   * @externs
   */
  var require;
  var global;
  var ES6Promise;
  var process;
  var define;
  var module;
  var exports;
  
  var ShadyDOM;
  var WebComponents;
  
  /** @type {!Function} */
  Promise.cast;
  
  /** @type {function()} */
  HTMLTemplateElement.bootstrap;