The Tor Browser / file revision

 /* 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";

 // This module basically translates system/events to a SDK standard events

 // so that `map`, `filter` and other utilities could be used with them.

 module.metadata = {

   "stability": "experimental"

 };

 const events = require("../system/events");

 const { emit } = require("../event/core");

 let channel = {};

 function forward({ subject, type, data })

   emit(channel, "data", { target: subject, type: type, data: data });

 ["popupshowing", "popuphiding", "popupshown", "popuphidden",

 "document-element-inserted", "DOMContentLoaded", "load"

 ].forEach(function(type) events.on(type, forward));

 exports.events = channel;