diff --git a/filenames.auto.gni b/filenames.auto.gni
index 6d36e9a850fa..2406370d0581 100644
--- a/filenames.auto.gni
+++ b/filenames.auto.gni
@@ -237,7 +237,7 @@ auto_filenames = {
     "lib/browser/navigation-controller.js",
     "lib/browser/remote/objects-registry.ts",
     "lib/browser/remote/server.ts",
-    "lib/browser/rpc-server.js",
+    "lib/browser/rpc-server.ts",
     "lib/browser/utils.ts",
     "lib/common/api/clipboard.ts",
     "lib/common/api/deprecate.ts",
diff --git a/lib/browser/remote/server.ts b/lib/browser/remote/server.ts
index 754cf75ac8f9..c4e28696a89b 100644
--- a/lib/browser/remote/server.ts
+++ b/lib/browser/remote/server.ts
@@ -284,7 +284,7 @@ const unwrapArgs = function (sender: electron.WebContents, frameId: number, cont
 };
 
 const isRemoteModuleEnabledImpl = function (contents: electron.WebContents) {
-  const webPreferences = (contents as any).getLastWebPreferences() || {};
+  const webPreferences = contents.getLastWebPreferences() || {};
   return webPreferences.enableRemoteModule != null ? !!webPreferences.enableRemoteModule : false;
 };
 
diff --git a/lib/browser/rpc-server.js b/lib/browser/rpc-server.ts
similarity index 76%
rename from lib/browser/rpc-server.js
rename to lib/browser/rpc-server.ts
index bd7b8917ae3c..b7cd6a5da8c4 100644
--- a/lib/browser/rpc-server.js
+++ b/lib/browser/rpc-server.ts
@@ -1,17 +1,15 @@
-'use strict';
-
-const electron = require('electron');
-const fs = require('fs');
+import * as electron from 'electron';
+import * as fs from 'fs';
+import { ipcMainInternal } from './ipc-main-internal';
+import * as ipcMainUtils from './ipc-main-internal-utils';
+import * as guestViewManager from './guest-view-manager';
+import * as typeUtils from '../common/type-utils';
+import { IpcMainInvokeEvent } from 'electron/main';
 
 const eventBinding = process._linkedBinding('electron_browser_event');
 const clipboard = process._linkedBinding('electron_common_clipboard');
 
-const { ipcMainInternal } = require('@electron/internal/browser/ipc-main-internal');
-const ipcMainUtils = require('@electron/internal/browser/ipc-main-internal-utils');
-const guestViewManager = require('@electron/internal/browser/guest-view-manager');
-const typeUtils = require('@electron/internal/common/type-utils');
-
-const emitCustomEvent = function (contents, eventName, ...args) {
+const emitCustomEvent = function (contents: electron.WebContents, eventName: string, ...args: any[]) {
   const event = eventBinding.createWithSender(contents);
 
   electron.app.emit(eventName, event, contents, ...args);
@@ -20,14 +18,14 @@ const emitCustomEvent = function (contents, eventName, ...args) {
   return event;
 };
 
-const logStack = function (contents, code, stack) {
+const logStack = function (contents: electron.WebContents, code: string, stack: string) {
   if (stack) {
     console.warn(`WebContents (${contents.id}): ${code}`, stack);
   }
 };
 
 // Implements window.close()
-ipcMainInternal.on('ELECTRON_BROWSER_WINDOW_CLOSE', function (event) {
+ipcMainInternal.on('ELECTRON_BROWSER_WINDOW_CLOSE', function (event: ElectronInternal.IpcMainInternalEvent) {
   const window = event.sender.getOwnerBrowserWindow();
   if (window) {
     window.close();
@@ -35,7 +33,7 @@ ipcMainInternal.on('ELECTRON_BROWSER_WINDOW_CLOSE', function (event) {
   event.returnValue = null;
 });
 
-ipcMainInternal.handle('ELECTRON_BROWSER_GET_LAST_WEB_PREFERENCES', function (event) {
+ipcMainInternal.handle('ELECTRON_BROWSER_GET_LAST_WEB_PREFERENCES', function (event: IpcMainInvokeEvent) {
   return event.sender.getLastWebPreferences();
 });
 
@@ -51,18 +49,18 @@ const allowedClipboardMethods = (() => {
   }
 })();
 
-ipcMainUtils.handleSync('ELECTRON_BROWSER_CLIPBOARD_SYNC', function (event, method, ...args) {
+ipcMainUtils.handleSync('ELECTRON_BROWSER_CLIPBOARD_SYNC', function (event: IpcMainInvokeEvent, method: string, ...args: any[]) {
   if (!allowedClipboardMethods.has(method)) {
     throw new Error(`Invalid method: ${method}`);
   }
 
-  return typeUtils.serialize(electron.clipboard[method](...typeUtils.deserialize(args)));
+  return typeUtils.serialize((electron.clipboard as any)[method](...typeUtils.deserialize(args)));
 });
 
 if (BUILDFLAG(ENABLE_DESKTOP_CAPTURER)) {
   const desktopCapturer = require('@electron/internal/browser/desktop-capturer');
 
-  ipcMainInternal.handle('ELECTRON_BROWSER_DESKTOP_CAPTURER_GET_SOURCES', async function (event, options, stack) {
+  ipcMainInternal.handle('ELECTRON_BROWSER_DESKTOP_CAPTURER_GET_SOURCES', async function (event: IpcMainInvokeEvent, options: Electron.SourcesOptions, stack: string) {
     logStack(event.sender, 'desktopCapturer.getSources()', stack);
     const customEvent = emitCustomEvent(event.sender, 'desktop-capturer-get-sources');
 
@@ -74,7 +72,7 @@ if (BUILDFLAG(ENABLE_DESKTOP_CAPTURER)) {
     return typeUtils.serialize(await desktopCapturer.getSourcesImpl(event, options));
   });
 
-  ipcMainInternal.handle('ELECTRON_BROWSER_DESKTOP_CAPTURER_GET_MEDIA_SOURCE_ID_FOR_WEB_CONTENTS', function (event, webContentsId, stack) {
+  ipcMainInternal.handle('ELECTRON_BROWSER_DESKTOP_CAPTURER_GET_MEDIA_SOURCE_ID_FOR_WEB_CONTENTS', function (event: IpcMainInvokeEvent, webContentsId: number) {
     return desktopCapturer.getMediaSourceIdForWebContents(event, webContentsId);
   });
 }
@@ -83,7 +81,7 @@ const isRemoteModuleEnabled = BUILDFLAG(ENABLE_REMOTE_MODULE)
   ? require('@electron/internal/browser/remote/server').isRemoteModuleEnabled
   : () => false;
 
-const getPreloadScript = async function (preloadPath) {
+const getPreloadScript = async function (preloadPath: string) {
   let preloadSrc = null;
   let preloadError = null;
   try {
@@ -94,7 +92,7 @@ const getPreloadScript = async function (preloadPath) {
   return { preloadPath, preloadSrc, preloadError };
 };
 
-ipcMainUtils.handleSync('ELECTRON_BROWSER_SANDBOX_LOAD', async function (event) {
+ipcMainUtils.handleSync('ELECTRON_BROWSER_SANDBOX_LOAD', async function (event: IpcMainInvokeEvent) {
   const preloadPaths = event.sender._getPreloadPaths();
   const webPreferences = event.sender.getLastWebPreferences() || {};
 
@@ -115,7 +113,7 @@ ipcMainUtils.handleSync('ELECTRON_BROWSER_SANDBOX_LOAD', async function (event)
   };
 });
 
-ipcMainInternal.on('ELECTRON_BROWSER_PRELOAD_ERROR', function (event, preloadPath, error) {
+ipcMainInternal.on('ELECTRON_BROWSER_PRELOAD_ERROR', function (event: ElectronInternal.IpcMainInternalEvent, preloadPath: string, error: Error) {
   event.sender.emit('preload-error', event, preloadPath, error);
 });
 
@@ -131,7 +129,7 @@ ipcMainUtils.handleSync('ELECTRON_CRASH_REPORTER_GET_UPLOAD_TO_SERVER', () => {
   return electron.crashReporter.getUploadToServer();
 });
 
-ipcMainUtils.handleSync('ELECTRON_CRASH_REPORTER_SET_UPLOAD_TO_SERVER', (event, uploadToServer) => {
+ipcMainUtils.handleSync('ELECTRON_CRASH_REPORTER_SET_UPLOAD_TO_SERVER', (event: IpcMainInvokeEvent, uploadToServer: boolean) => {
   return electron.crashReporter.setUploadToServer(uploadToServer);
 });
 
diff --git a/spec-main/api-browser-window-spec.ts b/spec-main/api-browser-window-spec.ts
index c91f2650164c..9d0cc0102bb0 100644
--- a/spec-main/api-browser-window-spec.ts
+++ b/spec-main/api-browser-window-spec.ts
@@ -2213,7 +2213,7 @@ describe('BrowserWindow module', () => {
           emittedOnce(app, 'web-contents-created'),
           emittedOnce(ipcMain, 'answer')
         ]);
-        const webPreferences = (childWebContents as any).getLastWebPreferences();
+        const webPreferences = childWebContents.getLastWebPreferences();
         expect(webPreferences.foo).to.equal('bar');
       });
 
@@ -2530,7 +2530,7 @@ describe('BrowserWindow module', () => {
           emittedOnce(app, 'web-contents-created'),
           emittedOnce(ipcMain, 'answer')
         ]);
-        const webPreferences = (childWebContents as any).getLastWebPreferences();
+        const webPreferences = childWebContents.getLastWebPreferences();
         expect(webPreferences.foo).to.equal('bar');
       });
 
diff --git a/spec-main/chromium-spec.ts b/spec-main/chromium-spec.ts
index 3f30f076dd7d..07575339cbe8 100644
--- a/spec-main/chromium-spec.ts
+++ b/spec-main/chromium-spec.ts
@@ -598,7 +598,7 @@ describe('chromium features', () => {
       contents.sendInputEvent({ type: 'mouseDown', clickCount: 1, x: 1, y: 1 });
       contents.sendInputEvent({ type: 'mouseUp', clickCount: 1, x: 1, y: 1 });
       const [, window] = await emittedOnce(app, 'browser-window-created');
-      const preferences = (window.webContents as any).getLastWebPreferences();
+      const preferences = window.webContents.getLastWebPreferences();
       expect(preferences.javascript).to.be.false();
     });
 
diff --git a/typings/internal-electron.d.ts b/typings/internal-electron.d.ts
index 0b7550bf89de..2810188d45ef 100644
--- a/typings/internal-electron.d.ts
+++ b/typings/internal-electron.d.ts
@@ -32,6 +32,13 @@ declare namespace Electron {
   interface WebContents {
     _getURL(): string;
     getOwnerBrowserWindow(): Electron.BrowserWindow;
+    getLastWebPreferences(): Electron.WebPreferences;
+    _getPreloadPaths(): string[];
+  }
+
+  interface WebPreferences {
+    guestInstanceId?: number;
+    openerId?: number;
   }
 
   interface SerializedError {