Issue 4795 - Use modern JavaScript syntax

lib/messaging.js

Index: lib/messaging.js
diff --git a/lib/messaging.js b/lib/messaging.js
index 8cb24de383f32a0a7995339e5863a533687b1e68..4e8f3237b546fb5bbb9de02b5f8c9ef9438b3d8d 100644
--- a/lib/messaging.js
+++ b/lib/messaging.js
@@ -19,7 +19,7 @@
 
 "use strict";
 
-let {EventEmitter} = require("events");
+const {EventEmitter} = require("events");
 
 /**
  * Communication port wrapping ext.onMessage to receive messages.
@@ -34,7 +34,7 @@ function Port()
 };
 
 Port.prototype = {
-  _onMessage: function(message, sender, sendResponse)
+  _onMessage(message, sender, sendResponse)
   {
     let async = false;
     let callbacks = this._eventEmitter.listeners(message.type);
@@ -81,7 +81,7 @@ Port.prototype = {
    * @param {string}   name
    * @param {Port~messageCallback} callback
    */
-  on: function(name, callback)
+  on(name, callback)
   {
     this._eventEmitter.on(name, callback);
   },
@@ -92,7 +92,7 @@ Port.prototype = {
    * @param {string}   name
    * @param {Port~messageCallback} callback
    */
-  off: function(name, callback)
+  off(name, callback)
   {
     this._eventEmitter.off(name, callback);
   },
@@ -100,7 +100,7 @@ Port.prototype = {
   /**
    * Disables the port and makes it stop listening to incoming messages.
    */
-  disconnect: function()
+  disconnect()
   {
     ext.onMessage.removeListener(this._onMessage);
   }