angular__angular/packages/zone.js/test/browser_shadydom_setup.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
function initAddEventListeners() {
  const HTMLSlotElement = (window as any).HTMLSlotElement;
  const prototypes = [
    Object.getPrototypeOf(window),
    Node.prototype,
    Text.prototype,
    Element.prototype,
    Object.getPrototypeOf(window),
    HTMLElement.prototype,
    HTMLSlotElement && HTMLSlotElement.prototype,
    DocumentFragment.prototype,
    Document.prototype,
  ];
  prototypes.forEach((proto) => {
    proto.addEventListener = function (eventName: string, callback: any) {
      this.callback = callback;
    };
    proto.dispatchEvent = function (event: any) {
      this.callback && this.callback.call(this, event);
    };
  });
}

initAddEventListeners();