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';

 const models = exports.models = new WeakMap();

 const views = exports.views = new WeakMap();

 exports.buttons = new WeakMap();

 exports.viewsFor = function viewsFor(sidebar) views.get(sidebar);

 exports.modelFor = function modelFor(sidebar) models.get(sidebar);