Use const/let and removes CoffeeScript ref vars

lib/browser/guest-window-manager.js

@@ -3,12 +3,12 @@
 const ipcMain = require('electron').ipcMain
 const BrowserWindow = require('electron').BrowserWindow
 
-var hasProp = {}.hasOwnProperty
+const hasProp = {}.hasOwnProperty
-var frameToGuest = {}
+const frameToGuest = {}
 
 // Copy attribute of |parent| to |child| if it is not defined in |child|.
-var mergeOptions = function (child, parent) {
+const mergeOptions = function (child, parent) {
-  var key, value
+  let key, value
   for (key in parent) {
     if (!hasProp.call(parent, key)) continue
     value = parent[key]
@@ -24,7 +24,7 @@ var mergeOptions = function (child, parent) {
 }
 
 // Merge |options| with the |embedder|'s window's options.
-var mergeBrowserWindowOptions = function (embedder, options) {
+const mergeBrowserWindowOptions = function (embedder, options) {
   if (embedder.browserWindowOptions != null) {
     // Inherit the original options if it is a BrowserWindow.
     mergeOptions(options, embedder.browserWindowOptions)
@@ -45,9 +45,8 @@ var mergeBrowserWindowOptions = function (embedder, options) {
 }
 
 // Create a new guest created by |embedder| with |options|.
-var createGuest = function (embedder, url, frameName, options) {
+const createGuest = function (embedder, url, frameName, options) {
-  var closedByEmbedder, closedByUser, guest, guestId, ref1
+  let guest = frameToGuest[frameName]
-  guest = frameToGuest[frameName]
   if (frameName && (guest != null)) {
     guest.loadURL(url)
     return guest.id
@@ -57,24 +56,27 @@ var createGuest = function (embedder, url, frameName, options) {
   if (options.webPreferences == null) {
     options.webPreferences = {}
   }
-  options.webPreferences.openerId = (ref1 = BrowserWindow.fromWebContents(embedder)) != null ? ref1.id : void 0
+  const embedderWindow = BrowserWindow.fromWebContents(embedder)
+  options.webPreferences.openerId = embedderWindow != null ? embedderWindow.id : void 0
   guest = new BrowserWindow(options)
   guest.loadURL(url)
 
   // When |embedder| is destroyed we should also destroy attached guest, and if
   // guest is closed by user then we should prevent |embedder| from double
   // closing guest.
-  guestId = guest.id
+  const guestId = guest.id
-  closedByEmbedder = function () {
+
+  const closedByEmbedder = function () {
     guest.removeListener('closed', closedByUser)
-    return guest.destroy()
+    guest.destroy()
   }
-  closedByUser = function () {
+  const closedByUser = function () {
     embedder.send('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_CLOSED_' + guestId)
-    return embedder.removeListener('render-view-deleted', closedByEmbedder)
+    embedder.removeListener('render-view-deleted', closedByEmbedder)
   }
   embedder.once('render-view-deleted', closedByEmbedder)
   guest.once('closed', closedByUser)
+
   if (frameName) {
     frameToGuest[frameName] = guest
     guest.frameName = frameName
@@ -82,6 +84,7 @@ var createGuest = function (embedder, url, frameName, options) {
       delete frameToGuest[frameName]
     })
   }
+
   return guest.id
 }
 
@@ -97,28 +100,35 @@ ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_OPEN', function (event, url, fr
 })
 
 ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_CLOSE', function (event, guestId) {
-  var ref1
+  const guestWindow = BrowserWindow.fromId(guestId)
-  (ref1 = BrowserWindow.fromId(guestId)) != null ? ref1.destroy() : void 0
+  if (guestWindow != null) guestWindow.destroy()
 })
 
 ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_METHOD', function (event, guestId, method, ...args) {
-  var ref1
+  const guestWindow = BrowserWindow.fromId(guestId)
-  event.returnValue = (ref1 = BrowserWindow.fromId(guestId)) != null ? ref1[method].apply(ref1, args) : void 0
+  event.returnValue = guestWindow != null ? guestWindow[method].apply(guestWindow, args) : void 0
 })
 
 ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_POSTMESSAGE', function (event, guestId, message, targetOrigin, sourceOrigin) {
-  var guestContents, ref1, ref2, sourceId
+  const sourceContents = BrowserWindow.fromWebContents(event.sender)
-  sourceId = (ref1 = BrowserWindow.fromWebContents(event.sender)) != null ? ref1.id : void 0
+  const sourceId = sourceContents != null ? sourceContents.id : void 0
   if (sourceId == null) {
     return
   }
-  guestContents = (ref2 = BrowserWindow.fromId(guestId)) != null ? ref2.webContents : void 0
+
+  const guestWindow = BrowserWindow.fromId(guestId)
+  const guestContents = guestWindow != null ? guestWindow.webContents : void 0
   if ((guestContents != null ? guestContents.getURL().indexOf(targetOrigin) : void 0) === 0 || targetOrigin === '*') {
     guestContents != null ? guestContents.send('ELECTRON_GUEST_WINDOW_POSTMESSAGE', sourceId, message, sourceOrigin) : void 0
   }
 })
 
 ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WEB_CONTENTS_METHOD', function (event, guestId, method, ...args) {
-  var ref1, ref2
+  const guestWindow = BrowserWindow.fromId(guestId)
-  (ref1 = BrowserWindow.fromId(guestId)) != null ? (ref2 = ref1.webContents) != null ? ref2[method].apply(ref2, args) : void 0 : void 0
+  if (guestWindow != null) {
+    const guestContents = guestWindow.webContents
+    if (guestContents != null) {
+      guestContents[method].apply(guestContents, args)
+    }
+  }
 })