refactor: pass internal flag via IPC message struct for consistency (#16490)

lib/browser/api/web-contents.js

@@ -358,6 +358,13 @@ const addReplyInternalToEvent = (event) => {
   })
 }
 
+const addReturnValueToEvent = (event) => {
+  Object.defineProperty(event, 'returnValue', {
+    set: (value) => event.sendReply([value]),
+    get: () => {}
+  })
+}
+
 // Add JavaScript wrappers for WebContents class.
 WebContents.prototype._init = function () {
   // The navigation controller.
@@ -370,38 +377,27 @@ WebContents.prototype._init = function () {
   this.capturePage = deprecate.promisify(this.capturePage, 2)
 
   // Dispatch IPC messages to the ipc module.
-  this.on('-ipc-message', function (event, [channel, ...args]) {
-    addReplyToEvent(event)
-    this.emit('ipc-message', event, channel, ...args)
-    ipcMain.emit(channel, event, ...args)
+  this.on('-ipc-message', function (event, internal, channel, args) {
+    if (internal) {
+      addReplyInternalToEvent(event)
+      ipcMainInternal.emit(channel, event, ...args)
+    } else {
+      addReplyToEvent(event)
+      this.emit('ipc-message', event, channel, ...args)
+      ipcMain.emit(channel, event, ...args)
+    }
   })
 
-  this.on('-ipc-message-sync', function (event, [channel, ...args]) {
-    Object.defineProperty(event, 'returnValue', {
-      set: function (value) {
-        return event.sendReply([value])
-      },
-      get: function () {}
-    })
-    addReplyToEvent(event)
-    this.emit('ipc-message-sync', event, channel, ...args)
-    ipcMain.emit(channel, event, ...args)
-  })
-
-  this.on('ipc-internal-message', function (event, [channel, ...args]) {
-    addReplyInternalToEvent(event)
-    ipcMainInternal.emit(channel, event, ...args)
-  })
-
-  this.on('ipc-internal-message-sync', function (event, [channel, ...args]) {
-    Object.defineProperty(event, 'returnValue', {
-      set: function (value) {
-        return event.sendReply([value])
-      },
-      get: function () {}
-    })
-    addReplyInternalToEvent(event)
-    ipcMainInternal.emit(channel, event, ...args)
+  this.on('-ipc-message-sync', function (event, internal, channel, args) {
+    addReturnValueToEvent(event)
+    if (internal) {
+      addReplyInternalToEvent(event)
+      ipcMainInternal.emit(channel, event, ...args)
+    } else {
+      addReplyToEvent(event)
+      this.emit('ipc-message-sync', event, channel, ...args)
+      ipcMain.emit(channel, event, ...args)
+    }
   })
 
   // Handle context menu action request from pepper plugin.

lib/browser/guest-view-manager.js

@@ -140,7 +140,7 @@ const createGuest = function (embedder, params) {
   }
 
   // Dispatch guest's IPC messages to embedder.
-  guest.on('ipc-message-host', function (_, [channel, ...args]) {
+  guest.on('ipc-message-host', function (_, channel, args) {
     sendToEmbedder('ELECTRON_GUEST_VIEW_INTERNAL_IPC_MESSAGE', channel, ...args)
   })