feat: add WebContentsView since BrowserView is deprecated.

Add new WebContentsView class as BrowserView is deprecated.
Ref: electron#198

index.d.ts

@@ -1,4 +1,5 @@
 import * as Electron from 'electron';
+import { WebContentsView } from './src/main/index';
 
 export {
   ClientRequest,
@@ -57,6 +58,9 @@ export var Tray: typeof Electron.Tray;
 export var webContents: typeof Electron.webContents;
 export var webFrameMain: typeof Electron.webFrameMain;
 
+// Taken from `RemoteMainInterface` but WebContentsView is only available in Electron >= 29.0.0
+export { WebContentsView };
+
 // Taken from `Remote`
 export function getCurrentWebContents(): Electron.WebContents;
 export function getCurrentWindow(): Electron.BrowserWindow;

src/common/utils.ts

@@ -0,0 +1,11 @@
+export function isVersionGreaterOrEqual(requiredVersion: string, currentVersion: string): boolean {
+    const required = requiredVersion.split('.').map(Number);
+    const current = currentVersion.split('.').map(Number);
+
+    for (let i = 0; i < required.length; i++) {
+        if (current[i] > required[i]) return true;
+        if (current[i] < required[i]) return false;
+    }
+
+    return true;
+}

src/main/index.ts

@@ -1 +1,13 @@
 export { initialize, isInitialized, enable } from "./server";
+
+import { isVersionGreaterOrEqual } from '../common/utils';
+
+const electronVersion = process.versions.electron;
+
+let WebContentsView: typeof Electron.WebContentsView | undefined;
+
+if (isVersionGreaterOrEqual('29.0.0', electronVersion)) {
+    WebContentsView = Electron.WebContentsView;
+}
+
+export { WebContentsView };