electron · codebytere · Mar 13, 2019 · Mar 9, 2019
diff --git a/lib/browser/api/web-contents.js b/lib/browser/api/web-contents.js
@@ -9,6 +9,7 @@ const { app, ipcMain, session, deprecate } = electron
 
 const NavigationController = require('@electron/internal/browser/navigation-controller')
 const { ipcMainInternal } = require('@electron/internal/browser/ipc-main-internal')
+const ipcMainUtils = require('@electron/internal/browser/ipc-main-internal-utils')
 const errorUtils = require('@electron/internal/common/error-utils')
 
 // session is not used here, the purpose is to make sure session is initalized
@@ -193,7 +194,7 @@ const asyncWebFrameMethods = function (requestId, method, callback, ...args) {
 
 for (const method of webFrameMethods) {
   WebContents.prototype[method] = function (...args) {
-    this._sendInternal('ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', method, args)
+    ipcMainUtils.invokeInWebContents(this, 'ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', method, ...args)
   }
 }
 

diff --git a/lib/browser/ipc-main-internal-utils.ts b/lib/browser/ipc-main-internal-utils.ts
@@ -1,7 +1,7 @@
 import { ipcMainInternal } from '@electron/internal/browser/ipc-main-internal'
 import * as errorUtils from '@electron/internal/common/error-utils'
 
-type IPCHandler = (...args: any[]) => any
+type IPCHandler = (event: ElectronInternal.IpcMainInternalEvent, ...args: any[]) => any
 
 const callHandler = async function (handler: IPCHandler, event: ElectronInternal.IpcMainInternalEvent, args: any[], reply: (args: any[]) => void) {
   try {
@@ -23,3 +23,21 @@ export const handle = function <T extends IPCHandler> (channel: string, handler:
     })
   })
 }
+
+let nextId = 0
+
+export function invokeInWebContents<T> (sender: Electron.WebContentsInternal, command: string, ...args: any[]) {
+  return new Promise<T>((resolve, reject) => {
+    const requestId = ++nextId
+    ipcMainInternal.once(`${command}_RESPONSE_${requestId}`, (
+      _event, error: Electron.SerializedError, result: any
+    ) => {
+      if (error) {
+        reject(errorUtils.deserialize(error))
+      } else {
+        resolve(result)
+      }
+    })
+    sender._sendInternal(command, requestId, ...args)
+  })
+}
diff --git a/lib/renderer/ipc-renderer-internal-utils.ts b/lib/renderer/ipc-renderer-internal-utils.ts
@@ -1,6 +1,21 @@
 import { ipcRendererInternal } from '@electron/internal/renderer/ipc-renderer-internal'
 import * as errorUtils from '@electron/internal/common/error-utils'
 
+type IPCHandler = (event: Electron.IpcRendererEvent, ...args: any[]) => any
+
+export const handle = function <T extends IPCHandler> (channel: string, handler: T) {
+  ipcRendererInternal.on(channel, (event, requestId, ...args) => {
+    new Promise(resolve => resolve(handler(event, ...args))
+    ).then(result => {
+      return [null, result]
+    }, error => {
+      return [errorUtils.serialize(error)]
+    }).then(responseArgs => {
+      event.sender.send(`${channel}_RESPONSE_${requestId}`, ...responseArgs)
+    })
+  })
+}
+
 let nextId = 0
    
 export function invoke<T> (command: string, ...args: any[]) {

diff --git a/lib/renderer/web-frame-init.ts b/lib/renderer/web-frame-init.ts
@@ -1,5 +1,6 @@
 import { webFrame, WebFrame } from 'electron'
 import { ipcRendererInternal } from '@electron/internal/renderer/ipc-renderer-internal'
+import * as ipcRendererUtils from '@electron/internal/renderer/ipc-renderer-internal-utils'
 import * as errorUtils from '@electron/internal/common/error-utils'
 
 // All keys of WebFrame that extend Function
@@ -10,13 +11,13 @@ type WebFrameMethod = {
 
 export const webFrameInit = () => {
   // Call webFrame method
-  ipcRendererInternal.on('ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', (
-    _event, method: keyof WebFrameMethod, args: any[]
+  ipcRendererUtils.handle('ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', (
+    event, method: keyof WebFrameMethod, ...args: any[]
   ) => {
     // The TypeScript compiler cannot handle the sheer number of
     // call signatures here and simply gives up. Incorrect invocations
     // will be caught by "keyof WebFrameMethod" though.
-    (webFrame[method] as any)(...args)
+    return (webFrame[method] as any)(...args)
   })
 
   ipcRendererInternal.on('ELECTRON_INTERNAL_RENDERER_ASYNC_WEB_FRAME_METHOD', (

diff --git a/typings/internal-electron.d.ts b/typings/internal-electron.d.ts
@@ -55,6 +55,10 @@ declare namespace Electron {
     sendToAll(webContentsId: number, channel: string, ...args: any[]): void
   }
 
+  interface WebContentsInternal extends Electron.WebContents {
+    _sendInternal(channel: string, ...args: any[]): void;
+  }
+
   const deprecate: ElectronInternal.DeprecationUtil;
 }