From 8889c2986627737e4aadd80fc3f6d6afe2fac27e Mon Sep 17 00:00:00 2001
From: Kevin Sawicki <kevinsawicki@gmail.com>
Date: Fri, 18 Mar 2016 11:51:02 -0700
Subject: [PATCH] Use rest parameters

---
 lib/browser/api/app.js                       |  8 ++-----
 lib/browser/api/dialog.js                    | 25 +++++++++++-----------
 lib/browser/api/navigation-controller.js     | 12 ++++-------
 lib/browser/api/web-contents.js              | 27 +++++++++---------------
 lib/browser/guest-view-manager.js            | 12 +++++------
 lib/browser/guest-window-manager.js          | 18 +++++++---------
 lib/browser/init.js                          |  8 +++----
 lib/common/api/callbacks-registry.js         | 16 ++++++--------
 lib/common/api/deprecate.js                  | 12 +++--------
 lib/renderer/api/ipc-renderer.js             | 22 +++++++-------------
 lib/renderer/api/ipc.js                      |  6 +-----
 lib/renderer/override.js                     | 20 ++++++------------
 lib/renderer/web-view/guest-view-internal.js | 31 +++++++++++++---------------
 lib/renderer/web-view/web-view.js            | 14 +++++--------
 14 files changed, 88 insertions(+), 143 deletions(-)

diff --git a/lib/browser/api/app.js b/lib/browser/api/app.js
index 8d2d203..27b0cb4 100644
--- a/lib/browser/api/app.js
+++ b/lib/browser/api/app.js
@@ -9,8 +9,6 @@ const bindings = process.atomBinding('app');
 const downloadItemBindings = process.atomBinding('download_item');
 const app = bindings.app;
 
-var slice = [].slice;
-
 app.__proto__ = EventEmitter.prototype;
 
 app.setApplicationMenu = function(menu) {
@@ -57,10 +55,8 @@ app.getAppPath = function() {
 // Routes the events to webContents.
 var ref1 = ['login', 'certificate-error', 'select-client-certificate'];
 var fn = function(name) {
-  return app.on(name, function() {
-    var args, event, webContents;
-    event = arguments[0], webContents = arguments[1], args = 3 <= arguments.length ? slice.call(arguments, 2) : [];
-    return webContents.emit.apply(webContents, [name, event].concat(slice.call(args)));
+  return app.on(name, function(event, webContents, ...args) {
+    return webContents.emit.apply(webContents, [name, event].concat(args));
   });
 };
 var i, len;
diff --git a/lib/browser/api/dialog.js b/lib/browser/api/dialog.js
index 102aaa3..8eb24aa 100644
--- a/lib/browser/api/dialog.js
+++ b/lib/browser/api/dialog.js
@@ -1,9 +1,10 @@
+'use strict';
+
 const app = require('electron').app;
 const BrowserWindow = require('electron').BrowserWindow;
 const binding = process.atomBinding('dialog');
 const v8Util = process.atomBinding('v8_util');
 
-var slice = [].slice;
 var includes = [].includes;
 
 var fileDialogProperties = {
@@ -41,9 +42,8 @@ var checkAppInitialized = function() {
 };
 
 module.exports = {
-  showOpenDialog: function() {
-    var args, callback, options, prop, properties, ref1, value, window, wrappedCallback;
-    args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
+  showOpenDialog: function(...args) {
+    var callback, options, prop, properties, ref1, value, window, wrappedCallback;
     checkAppInitialized();
     ref1 = parseArgs.apply(null, args), window = ref1[0], options = ref1[1], callback = ref1[2];
     if (options == null) {
@@ -79,9 +79,9 @@ module.exports = {
     } : null;
     return binding.showOpenDialog(String(options.title), String(options.defaultPath), options.filters, properties, window, wrappedCallback);
   },
-  showSaveDialog: function() {
-    var args, callback, options, ref1, window, wrappedCallback;
-    args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
+
+  showSaveDialog: function(...args) {
+    var callback, options, ref1, window, wrappedCallback;
     checkAppInitialized();
     ref1 = parseArgs.apply(null, args), window = ref1[0], options = ref1[1], callback = ref1[2];
     if (options == null) {
@@ -103,9 +103,9 @@ module.exports = {
     } : null;
     return binding.showSaveDialog(String(options.title), String(options.defaultPath), options.filters, window, wrappedCallback);
   },
-  showMessageBox: function() {
-    var args, callback, flags, i, j, len, messageBoxType, options, ref1, ref2, ref3, text, window;
-    args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
+
+  showMessageBox: function(...args) {
+    var callback, flags, i, j, len, messageBoxType, options, ref1, ref2, ref3, text, window;
     checkAppInitialized();
     ref1 = parseArgs.apply(null, args), window = ref1[0], options = ref1[1], callback = ref1[2];
     if (options == null) {
@@ -154,9 +154,8 @@ module.exports = {
     flags = options.noLink ? messageBoxOptions.noLink : 0;
     return binding.showMessageBox(messageBoxType, options.buttons, options.defaultId, options.cancelId, flags, options.title, options.message, options.detail, options.icon, window, callback);
   },
-  showErrorBox: function() {
-    var args;
-    args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
+
+  showErrorBox: function(...args) {
     return binding.showErrorBox.apply(binding, args);
   }
 };
diff --git a/lib/browser/api/navigation-controller.js b/lib/browser/api/navigation-controller.js
index 8c3878a..a934ffb 100644
--- a/lib/browser/api/navigation-controller.js
+++ b/lib/browser/api/navigation-controller.js
@@ -2,18 +2,14 @@
 
 const ipcMain = require('electron').ipcMain;
 
-var slice = [].slice;
-
 // The history operation in renderer is redirected to browser.
-ipcMain.on('ATOM_SHELL_NAVIGATION_CONTROLLER', function() {
-  var args, event, method, ref;
-  event = arguments[0], method = arguments[1], args = 3 <= arguments.length ? slice.call(arguments, 2) : [];
+ipcMain.on('ATOM_SHELL_NAVIGATION_CONTROLLER', function(event, method, ...args) {
+  var ref;
   return (ref = event.sender)[method].apply(ref, args);
 });
 
-ipcMain.on('ATOM_SHELL_SYNC_NAVIGATION_CONTROLLER', function() {
-  var args, event, method, ref;
-  event = arguments[0], method = arguments[1], args = 3 <= arguments.length ? slice.call(arguments, 2) : [];
+ipcMain.on('ATOM_SHELL_SYNC_NAVIGATION_CONTROLLER', function(event, method, ...args) {
+  var ref;
   return event.returnValue = (ref = event.sender)[method].apply(ref, args);
 });
 
diff --git a/lib/browser/api/web-contents.js b/lib/browser/api/web-contents.js
index c7dd3bc..d1630ec 100644
--- a/lib/browser/api/web-contents.js
+++ b/lib/browser/api/web-contents.js
@@ -9,7 +9,7 @@ const Menu = require('electron').Menu;
 const binding = process.atomBinding('web_contents');
 const debuggerBinding = process.atomBinding('debugger');
 
-let  slice = [].slice;
+let slice = [].slice;
 let nextId = 0;
 
 let getNextId = function() {
@@ -74,13 +74,11 @@ let wrapWebContents = function(webContents) {
   webContents.setMaxListeners(0);
 
   // WebContents::send(channel, args..)
-  webContents.send = function() {
-    var args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
-    var channel = arguments[0];
+  webContents.send = function(channel, ...args) {
     if (channel == null) {
       throw new Error('Missing required channel argument');
     }
-    return this._send(channel, slice.call(args));
+    return this._send(channel, args);
   };
 
   // The navigation controller.
@@ -99,8 +97,7 @@ let wrapWebContents = function(webContents) {
 
   // Mapping webFrame methods.
   for (let method of webFrameMethods) {
-    webContents[method] = function() {
-      let args = Array.prototype.slice.call(arguments);
+    webContents[method] = function(...args) {
       this.send('ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', method, args);
     };
   }
@@ -152,30 +149,26 @@ let wrapWebContents = function(webContents) {
   });
 
   // This error occurs when host could not be found.
-  webContents.on('did-fail-provisional-load', function() {
-    var args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-
+  webContents.on('did-fail-provisional-load', function(...args) {
     // Calling loadURL during this event might cause crash, so delay the event
     // until next tick.
     setImmediate(() => {
-      this.emit.apply(this, ['did-fail-load'].concat(slice.call(args)));
+      this.emit.apply(this, ['did-fail-load'].concat(args));
     });
   });
 
   // Delays the page-title-updated event to next tick.
-  webContents.on('-page-title-updated', function() {
-    var args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
+  webContents.on('-page-title-updated', function(...args) {
     setImmediate(() => {
-      this.emit.apply(this, ['page-title-updated'].concat(slice.call(args)));
+      this.emit.apply(this, ['page-title-updated'].concat(args));
     });
   });
 
   // Deprecated.
   deprecate.rename(webContents, 'loadUrl', 'loadURL');
   deprecate.rename(webContents, 'getUrl', 'getURL');
-  deprecate.event(webContents, 'page-title-set', 'page-title-updated', function() {
-    var args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-    return this.emit.apply(this, ['page-title-set'].concat(slice.call(args)));
+  deprecate.event(webContents, 'page-title-set', 'page-title-updated', function(...args) {
+    return this.emit.apply(this, ['page-title-set'].concat(args));
   });
   return webContents.printToPDF = function(options, callback) {
     var printingSetting;
diff --git a/lib/browser/guest-view-manager.js b/lib/browser/guest-view-manager.js
index 574207d..b19fc5c 100644
--- a/lib/browser/guest-view-manager.js
+++ b/lib/browser/guest-view-manager.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const ipcMain = require('electron').ipcMain;
 const webContents = require('electron').webContents;
 
@@ -136,9 +138,8 @@ var createGuest = function(embedder, params) {
 
   // Dispatch events to embedder.
   fn = function(event) {
-    return guest.on(event, function() {
-      var args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
-      return embedder.send.apply(embedder, ["ATOM_SHELL_GUEST_VIEW_INTERNAL_DISPATCH_EVENT-" + guest.viewInstanceId, event].concat(slice.call(args)));
+    return guest.on(event, function(_, ...args) {
+      return embedder.send.apply(embedder, ["ATOM_SHELL_GUEST_VIEW_INTERNAL_DISPATCH_EVENT-" + guest.viewInstanceId, event].concat(args));
     });
   };
   for (j = 0, len1 = supportedWebViewEvents.length; j < len1; j++) {
@@ -154,9 +155,8 @@ var createGuest = function(embedder, params) {
   });
 
   // Autosize.
-  guest.on('size-changed', function() {
-    var args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
-    return embedder.send.apply(embedder, ["ATOM_SHELL_GUEST_VIEW_INTERNAL_SIZE_CHANGED-" + guest.viewInstanceId].concat(slice.call(args)));
+  guest.on('size-changed', function(_, ...args) {
+    return embedder.send.apply(embedder, ["ATOM_SHELL_GUEST_VIEW_INTERNAL_SIZE_CHANGED-" + guest.viewInstanceId].concat(args));
   });
   return id;
 };
diff --git a/lib/browser/guest-window-manager.js b/lib/browser/guest-window-manager.js
index bdd32af..a8712ea 100644
--- a/lib/browser/guest-window-manager.js
+++ b/lib/browser/guest-window-manager.js
@@ -1,8 +1,9 @@
+'use strict';
+
 const ipcMain = require('electron').ipcMain;
 const BrowserWindow = require('electron').BrowserWindow;
 
 var hasProp = {}.hasOwnProperty;
-var slice = [].slice;
 var frameToGuest = {};
 
 // Copy attribute of |parent| to |child| if it is not defined in |child|.
@@ -81,9 +82,8 @@ var createGuest = function(embedder, url, frameName, options) {
 };
 
 // Routed window.open messages.
-ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_OPEN', function() {
-  var args, event, frameName, options, url;
-  event = arguments[0], args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
+ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_OPEN', function(event, ...args) {
+  var frameName, options, url;
   url = args[0], frameName = args[1], options = args[2];
   options = mergeBrowserWindowOptions(event.sender, options);
   event.sender.emit('new-window', event, url, frameName, 'new-window', options);
@@ -99,9 +99,8 @@ ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_CLOSE', function(event, guest
   return (ref1 = BrowserWindow.fromId(guestId)) != null ? ref1.destroy() : void 0;
 });
 
-ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_METHOD', function() {
-  var args, guestId, method, ref1;
-  event = arguments[0], guestId = arguments[1], method = arguments[2], args = 4 <= arguments.length ? slice.call(arguments, 3) : [];
+ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_METHOD', function(event, guestId, method, ...args) {
+  var ref1;
   return event.returnValue = (ref1 = BrowserWindow.fromId(guestId)) != null ? ref1[method].apply(ref1, args) : void 0;
 });
 
@@ -117,8 +116,7 @@ ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_POSTMESSAGE', function(event,
   }
 });
 
-ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WEB_CONTENTS_METHOD', function() {
-  var args, guestId, method, ref1, ref2;
-  guestId = arguments[1], method = arguments[2], args = 4 <= arguments.length ? slice.call(arguments, 3) : [];
+ipcMain.on('ATOM_SHELL_GUEST_WINDOW_MANAGER_WEB_CONTENTS_METHOD', function(event, guestId, method, ...args) {
+  var ref1, ref2;
   return (ref1 = BrowserWindow.fromId(guestId)) != null ? (ref2 = ref1.webContents) != null ? ref2[method].apply(ref2, args) : void 0 : void 0;
 });
diff --git a/lib/browser/init.js b/lib/browser/init.js
index 471cc3a..68ca6ff 100644
--- a/lib/browser/init.js
+++ b/lib/browser/init.js
@@ -1,11 +1,11 @@
+'use strict';
+
 const fs = require('fs');
 const path = require('path');
 const util = require('util');
 const Module = require('module');
 const v8 = require('v8');
 
-var slice = [].slice;
-
 // We modified the original process.argv to let node.js load the atom.js,
 // we need to restore it here.
 process.argv.splice(1, 1);
@@ -28,9 +28,7 @@ globalPaths.push(path.join(__dirname, 'api', 'exports'));
 if (process.platform === 'win32') {
   // Redirect node's console to use our own implementations, since node can not
   // handle console output when running as GUI program.
-  var consoleLog = function() {
-    var args;
-    args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
+  var consoleLog = function(...args) {
     return process.log(util.format.apply(util, args) + "\n");
   };
   var streamWrite = function(chunk, encoding, callback) {
diff --git a/lib/common/api/callbacks-registry.js b/lib/common/api/callbacks-registry.js
index 5b528aa..d5cfd2d 100644
--- a/lib/common/api/callbacks-registry.js
+++ b/lib/common/api/callbacks-registry.js
@@ -1,7 +1,5 @@
 'use strict';
 
-var slice = [].slice;
-
 const v8Util = process.atomBinding('v8_util');
 
 class CallbacksRegistry {
@@ -46,16 +44,14 @@ class CallbacksRegistry {
     return (ref = this.callbacks[id]) != null ? ref : function() {};
   }
 
-  call() {
-    var args, id, ref;
-    id = arguments[0], args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
-    return (ref = this.get(id)).call.apply(ref, [global].concat(slice.call(args)));
+  call(id, ...args) {
+    var ref;
+    return (ref = this.get(id)).call.apply(ref, [global].concat(args));
   }
 
-  apply() {
-    var args, id, ref;
-    id = arguments[0], args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
-    return (ref = this.get(id)).apply.apply(ref, [global].concat(slice.call(args)));
+  apply(id, ...args) {
+    var ref;
+    return (ref = this.get(id)).apply.apply(ref, [global].concat(args));
   }
 
   remove(id) {
diff --git a/lib/common/api/deprecate.js b/lib/common/api/deprecate.js
index 852d544..16bf71b 100644
--- a/lib/common/api/deprecate.js
+++ b/lib/common/api/deprecate.js
@@ -1,8 +1,5 @@
 // Deprecate a method.
-var deprecate,
-  slice = [].slice;
-
-deprecate = function(oldName, newName, fn) {
+const deprecate = function(oldName, newName, fn) {
   var warned;
   warned = false;
   return function() {
@@ -64,10 +61,7 @@ deprecate.property = function(object, property, method) {
 deprecate.event = function(emitter, oldName, newName, fn) {
   var warned;
   warned = false;
-  return emitter.on(newName, function() {
-    var args;
-    args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-
+  return emitter.on(newName, function(...args) {
     // there is listeners for old API.
     if (this.listenerCount(oldName) > 0) {
       if (!(warned || process.noDeprecation)) {
@@ -77,7 +71,7 @@ deprecate.event = function(emitter, oldName, newName, fn) {
       if (fn != null) {
         return fn.apply(this, arguments);
       } else {
-        return this.emit.apply(this, [oldName].concat(slice.call(args)));
+        return this.emit.apply(this, [oldName].concat(args));
       }
     }
   });
diff --git a/lib/renderer/api/ipc-renderer.js b/lib/renderer/api/ipc-renderer.js
index e946dc7..03fef36 100644
--- a/lib/renderer/api/ipc-renderer.js
+++ b/lib/renderer/api/ipc-renderer.js
@@ -1,27 +1,21 @@
+'use strict';
+
 const binding = process.atomBinding('ipc');
 const v8Util = process.atomBinding('v8_util');
 
-var slice = [].slice;
-
 // Created by init.js.
 const ipcRenderer = v8Util.getHiddenValue(global, 'ipc');
 
-ipcRenderer.send = function() {
-  var args;
-  args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-  return binding.send('ipc-message', slice.call(args));
+ipcRenderer.send = function(...args) {
+  return binding.send('ipc-message', args);
 };
 
-ipcRenderer.sendSync = function() {
-  var args;
-  args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-  return JSON.parse(binding.sendSync('ipc-message-sync', slice.call(args)));
+ipcRenderer.sendSync = function(...args) {
+  return JSON.parse(binding.sendSync('ipc-message-sync', args));
 };
 
-ipcRenderer.sendToHost = function() {
-  var args;
-  args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-  return binding.send('ipc-message-host', slice.call(args));
+ipcRenderer.sendToHost = function(...args) {
+  return binding.send('ipc-message-host', args);
 };
 
 module.exports = ipcRenderer;
diff --git a/lib/renderer/api/ipc.js b/lib/renderer/api/ipc.js
index a4bab33..ee07c79 100644
--- a/lib/renderer/api/ipc.js
+++ b/lib/renderer/api/ipc.js
@@ -2,17 +2,13 @@ const ipcRenderer = require('electron').ipcRenderer;
 const deprecate = require('electron').deprecate;
 const EventEmitter = require('events').EventEmitter;
 
-var slice = [].slice;
-
 // This module is deprecated, we mirror everything from ipcRenderer.
 deprecate.warn('ipc module', 'require("electron").ipcRenderer');
 
 // Routes events of ipcRenderer.
 var ipc = new EventEmitter;
 
-ipcRenderer.emit = function() {
-  var channel = arguments[0];
-  var args = 3 <= arguments.length ? slice.call(arguments, 2) : [];
+ipcRenderer.emit = function(channel, event, ...args) {
   ipc.emit.apply(ipc, [channel].concat(slice.call(args)));
   return EventEmitter.prototype.emit.apply(ipcRenderer, arguments);
 };
diff --git a/lib/renderer/override.js b/lib/renderer/override.js
index 69295d1..93a8b76 100644
--- a/lib/renderer/override.js
+++ b/lib/renderer/override.js
@@ -3,8 +3,6 @@
 const ipcRenderer = require('electron').ipcRenderer;
 const remote = require('electron').remote;
 
-var slice = [].slice;
-
 // Cache browser window visibility
 var _isVisible = true;
 var _isMinimized = false;
@@ -73,10 +71,8 @@ var BrowserWindowProxy = (function() {
     return ipcRenderer.send('ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_POSTMESSAGE', this.guestId, message, targetOrigin, location.origin);
   };
 
-  BrowserWindowProxy.prototype["eval"] = function() {
-    var args;
-    args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-    return ipcRenderer.send.apply(ipcRenderer, ['ATOM_SHELL_GUEST_WINDOW_MANAGER_WEB_CONTENTS_METHOD', this.guestId, 'executeJavaScript'].concat(slice.call(args)));
+  BrowserWindowProxy.prototype["eval"] = function(...args) {
+    return ipcRenderer.send.apply(ipcRenderer, ['ATOM_SHELL_GUEST_WINDOW_MANAGER_WEB_CONTENTS_METHOD', this.guestId, 'executeJavaScript'].concat(args));
   };
 
   return BrowserWindowProxy;
@@ -223,16 +219,12 @@ ipcRenderer.on('ATOM_SHELL_GUEST_WINDOW_POSTMESSAGE', function(event, sourceId,
 });
 
 // Forward history operations to browser.
-var sendHistoryOperation = function() {
-  var args;
-  args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-  return ipcRenderer.send.apply(ipcRenderer, ['ATOM_SHELL_NAVIGATION_CONTROLLER'].concat(slice.call(args)));
+var sendHistoryOperation = function(...args) {
+  return ipcRenderer.send.apply(ipcRenderer, ['ATOM_SHELL_NAVIGATION_CONTROLLER'].concat(args));
 };
 
-var getHistoryOperation = function() {
-  var args;
-  args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-  return ipcRenderer.sendSync.apply(ipcRenderer, ['ATOM_SHELL_SYNC_NAVIGATION_CONTROLLER'].concat(slice.call(args)));
+var getHistoryOperation = function(...args) {
+  return ipcRenderer.sendSync.apply(ipcRenderer, ['ATOM_SHELL_SYNC_NAVIGATION_CONTROLLER'].concat(args));
 };
 
 window.history.back = function() {
diff --git a/lib/renderer/web-view/guest-view-internal.js b/lib/renderer/web-view/guest-view-internal.js
index c6e46fa..a4d8930 100644
--- a/lib/renderer/web-view/guest-view-internal.js
+++ b/lib/renderer/web-view/guest-view-internal.js
@@ -1,8 +1,9 @@
+'use strict';
+
 const ipcRenderer = require('electron').ipcRenderer;
 const webFrame = require('electron').webFrame;
 
-var slice = [].slice;
-var requestId = 0;
+var requestId= 0;
 
 var WEB_VIEW_EVENTS = {
   'load-commit': ['url', 'isMainFrame'],
@@ -41,11 +42,10 @@ var DEPRECATED_EVENTS = {
   'page-title-updated': 'page-title-set'
 };
 
-var dispatchEvent = function() {
-  var args, domEvent, eventKey, eventName, f, i, j, len, ref1, webView;
-  webView = arguments[0], eventName = arguments[1], eventKey = arguments[2], args = 4 <= arguments.length ? slice.call(arguments, 3) : [];
+var dispatchEvent = function(webView, eventName, eventKey, ...args) {
+  var domEvent, f, i, j, len, ref1;
   if (DEPRECATED_EVENTS[eventName] != null) {
-    dispatchEvent.apply(null, [webView, DEPRECATED_EVENTS[eventName], eventKey].concat(slice.call(args)));
+    dispatchEvent.apply(null, [webView, DEPRECATED_EVENTS[eventName], eventKey].concat(args));
   }
   domEvent = new Event(eventName);
   ref1 = WEB_VIEW_EVENTS[eventKey];
@@ -61,22 +61,19 @@ var dispatchEvent = function() {
 
 module.exports = {
   registerEvents: function(webView, viewInstanceId) {
-    ipcRenderer.on("ATOM_SHELL_GUEST_VIEW_INTERNAL_DISPATCH_EVENT-" + viewInstanceId, function() {
-      var eventName = arguments[1];
-      var args = 3 <= arguments.length ? slice.call(arguments, 2) : [];
-      return dispatchEvent.apply(null, [webView, eventName, eventName].concat(slice.call(args)));
+    ipcRenderer.on("ATOM_SHELL_GUEST_VIEW_INTERNAL_DISPATCH_EVENT-" + viewInstanceId, function(event, eventName, ...args) {
+      return dispatchEvent.apply(null, [webView, eventName, eventName].concat(args));
     });
-    ipcRenderer.on("ATOM_SHELL_GUEST_VIEW_INTERNAL_IPC_MESSAGE-" + viewInstanceId, function() {
-      var channel = arguments[1];
-      var args = 3 <= arguments.length ? slice.call(arguments, 2) : [];
+
+    ipcRenderer.on("ATOM_SHELL_GUEST_VIEW_INTERNAL_IPC_MESSAGE-" + viewInstanceId, function(event, channel, ...args) {
       var domEvent = new Event('ipc-message');
       domEvent.channel = channel;
-      domEvent.args = slice.call(args);
+      domEvent.args = args;
       return webView.dispatchEvent(domEvent);
     });
-    return ipcRenderer.on("ATOM_SHELL_GUEST_VIEW_INTERNAL_SIZE_CHANGED-" + viewInstanceId, function() {
-      var args, domEvent, f, i, j, len, ref1;
-      args = 2 <= arguments.length ? slice.call(arguments, 1) : [];
+
+    return ipcRenderer.on("ATOM_SHELL_GUEST_VIEW_INTERNAL_SIZE_CHANGED-" + viewInstanceId, function(event, ...args) {
+      var domEvent, f, i, j, len, ref1;
       domEvent = new Event('size-changed');
       ref1 = ['oldWidth', 'oldHeight', 'newWidth', 'newHeight'];
       for (i = j = 0, len = ref1.length; j < len; i = ++j) {
diff --git a/lib/renderer/web-view/web-view.js b/lib/renderer/web-view/web-view.js
index 554b2f0..0d85b75 100644
--- a/lib/renderer/web-view/web-view.js
+++ b/lib/renderer/web-view/web-view.js
@@ -10,7 +10,6 @@ const guestViewInternal = require('./guest-view-internal');
 const webViewConstants = require('./web-view-constants');
 
 var hasProp = {}.hasOwnProperty;
-var slice = [].slice;
 
 // ID generator.
 var nextId = 0;
@@ -392,9 +391,8 @@ var registerWebViewElement = function() {
 
   // Forward proto.foo* method calls to WebViewImpl.foo*.
   createBlockHandler = function(m) {
-    return function() {
-      var args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-      var internal = v8Util.getHiddenValue(this, 'internal');
+    return function(...args) {
+      const internal = v8Util.getHiddenValue(this, 'internal');
       if (internal.webContents) {
         return internal.webContents[m].apply(internal.webContents, args);
       } else {
@@ -407,11 +405,9 @@ var registerWebViewElement = function() {
     proto[m] = createBlockHandler(m);
   }
   createNonBlockHandler = function(m) {
-    return function() {
-      var args, internal;
-      args = 1 <= arguments.length ? slice.call(arguments, 0) : [];
-      internal = v8Util.getHiddenValue(this, 'internal');
-      return ipcRenderer.send.apply(ipcRenderer, ['ATOM_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', null, internal.guestInstanceId, m].concat(slice.call(args)));
+    return function(...args) {
+      const internal = v8Util.getHiddenValue(this, 'internal');
+      return ipcRenderer.send.apply(ipcRenderer, ['ATOM_BROWSER_ASYNC_CALL_TO_GUEST_VIEW', null, internal.guestInstanceId, m].concat(args));
     };
   };
   for (j = 0, len1 = nonblockMethods.length; j < len1; j++) {
-- 
2.7.4