Issue 4864 - Start using ESLint for adblockpluschrome

lib/messaging.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 13 matching lines @@
 /**
  * Communication port wrapping ext.onMessage to receive messages.
  *
  * @constructor
  */
 function Port()
 {
   this._eventEmitter = new EventEmitter();
   this._onMessage = this._onMessage.bind(this);
   ext.onMessage.addListener(this._onMessage);
-};
+}
 
 Port.prototype = {
   _onMessage(message, sender, sendResponse)
   {
     let async = false;
     let callbacks = this._eventEmitter.listeners(message.type);
 
     for (let callback of callbacks)
     {
       let response = callback(message, sender);
 
       if (response && typeof response.then == "function")
       {
         response.then(
           sendResponse,
-          reason => {
+          reason =>
+          {
             console.error(reason);
             sendResponse(undefined);
           }
         );
         async = true;
       }
       else if (typeof response != "undefined")
       {
         sendResponse(response);
       }
@@ skipping 61 matching lines @@
 exports.getPort = function(window)
 {
   let port = new Port();
   window.addEventListener("unload", () =>
   {
     port.disconnect();
   });
   return port;
 };