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/**
 * @fileoverview Externs for webcomponents polyfills
 * @externs
 *
 * @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
 */
/* eslint-disable */

let HTMLImports = {
  /**
   * @param {function()} callback
   */
  whenReady(callback){},
  /**
   * @param {Element} element
   * @returns {Document} document
   */
  importForElement(element){}
};

window.HTMLImports = HTMLImports;

let ShadyDOM = {
  inUse: false,
  flush(){},
  /**
   * @param {!Node} target
   * @param {function(Array<MutationRecord>, MutationObserver)} callback
   * @return {MutationObserver}
   */
  observeChildren(target, callback){},
  /**
   * @param {MutationObserver} observer
   */
  unobserveChildren(observer){},
  /**
   * @param {Node} node
   */
  patch(node){}
};

window.ShadyDOM = ShadyDOM;

let WebComponents = {};
window.WebComponents = WebComponents;

/** @type {Element} */
HTMLElement.prototype._activeElement;

/**
 * @param {HTMLTemplateElement} template
 */
HTMLTemplateElement.decorate = function(template){};

/**
 * @param {function(function())} cb callback
 */
CustomElementRegistry.prototype.polyfillWrapFlushCallback = function(cb){};