🎨 Use const and for/of loops

lib/browser/guest-view-manager.js

@@ -57,12 +57,12 @@ var getNextInstanceId = function () {
 
 // Create a new guest instance.
 var createGuest = function (embedder, params) {
-  var destroy, destroyEvents, event, fn, guest, i, id, j, len, len1, listeners
   if (webViewManager == null) {
     webViewManager = process.atomBinding('web_view_manager')
   }
-  id = getNextInstanceId(embedder)
-  guest = webContents.create({
+
+  const id = getNextInstanceId(embedder)
+  const guest = webContents.create({
     isGuest: true,
     partition: params.partition,
     embedder: embedder
@@ -73,20 +73,19 @@ var createGuest = function (embedder, params) {
   }
 
   // Destroy guest when the embedder is gone or navigated.
-  destroyEvents = ['will-destroy', 'crashed', 'did-navigate']
-  destroy = function () {
+  const destroyEvents = ['will-destroy', 'crashed', 'did-navigate']
+  const destroy = function () {
     if (guestInstances[id] != null) {
-      return destroyGuest(embedder, id)
+      destroyGuest(embedder, id)
     }
   }
-  for (i = 0, len = destroyEvents.length; i < len; i++) {
-    event = destroyEvents[i]
+  for (const event of destroyEvents) {
     embedder.once(event, destroy)
 
     // Users might also listen to the crashed event, so We must ensure the guest
     // is destroyed before users' listener gets called. It is done by moving our
     // listener to the first one in queue.
-    listeners = embedder._events[event]
+    const listeners = embedder._events[event]
     if (Array.isArray(listeners)) {
       moveLastToFirst(listeners)
     }
@@ -132,13 +131,12 @@ var createGuest = function (embedder, params) {
   })
 
   // Dispatch events to embedder.
-  fn = function (event) {
-    return guest.on(event, function (_, ...args) {
+  const fn = function (event) {
+    guest.on(event, function (_, ...args) {
       embedder.send.apply(embedder, ['ELECTRON_GUEST_VIEW_INTERNAL_DISPATCH_EVENT-' + guest.viewInstanceId, event].concat(args))
     })
   }
-  for (j = 0, len1 = supportedWebViewEvents.length; j < len1; j++) {
-    event = supportedWebViewEvents[j]
+  for (const event of supportedWebViewEvents) {
     fn(event)
   }
 
@@ -151,6 +149,7 @@ var createGuest = function (embedder, params) {
   guest.on('size-changed', function (_, ...args) {
     embedder.send.apply(embedder, ['ELECTRON_GUEST_VIEW_INTERNAL_SIZE_CHANGED-' + guest.viewInstanceId].concat(args))
   })
+
   return id
 }