Left file: appwork-v1_3_1/rails-starter/app/assets/javascripts/cable.js  
Right file: appwork-v1_4_0/rails-turbolinks-starter/app/javascript/channels/index.js  

// Action Cable provides the framework to deal with WebSockets in Rails.	<>	// Load all the channels within this directory and all subdirectories.
// You can generate new channels where WebSocket features live using the `rails generate channel` command.
//
//= require action_cable
//= require_self
//= require_tree ./channels
		// Channel files must be named *_channel.js.
(function() {
this.App || (this.App = {});
		const channels = require.context('.', true, /_channel\.js$/)
App.cable = ActionCable.createConsumer();
		channels.keys().forEach(channels)
}).call(this);