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";

 module.metadata = {

   "stability": "unstable"

 };

 const { dispatcher } = require("../util/dispatcher");

 // Define `modelFor` accessor function that can be implemented

 // for different types of views. Since view's we'll be dealing

 // with types that don't really play well with `instanceof`

 // operator we're gonig to use `dispatcher` that is slight

 // extension over polymorphic dispatch provided by method.

 // This allows models to extend implementations of this by

 // providing predicates:

 //

 // modelFor.when($ => $ && $.nodeName === "tab", findTabById($.id))

 const modelFor = dispatcher("modelFor");

 exports.modelFor = modelFor;