refactor: Port renderer/web-view to TypeScript (#17250)

lib/renderer/web-view/web-view-init.ts

@@ -0,0 +1,36 @@
+import { ipcRendererInternal } from '@electron/internal/renderer/ipc-renderer-internal'
+
+const v8Util = process.atomBinding('v8_util')
+
+function handleFocusBlur (guestInstanceId: number) {
+  // Note that while Chromium content APIs have observer for focus/blur, they
+  // unfortunately do not work for webview.
+
+  window.addEventListener('focus', () => {
+    ipcRendererInternal.send('ELECTRON_GUEST_VIEW_MANAGER_FOCUS_CHANGE', true, guestInstanceId)
+  })
+
+  window.addEventListener('blur', () => {
+    ipcRendererInternal.send('ELECTRON_GUEST_VIEW_MANAGER_FOCUS_CHANGE', false, guestInstanceId)
+  })
+}
+
+export function webViewInit (
+  contextIsolation: boolean, webviewTag: ElectronInternal.WebViewElement, guestInstanceId: number
+) {
+  // Don't allow recursive `<webview>`.
+  if (webviewTag && guestInstanceId == null) {
+    const { webViewImplModule } = require('@electron/internal/renderer/web-view/web-view-impl')
+    if (contextIsolation) {
+      v8Util.setHiddenValue(window, 'web-view-impl', webViewImplModule)
+    } else {
+      const { setupWebView } = require('@electron/internal/renderer/web-view/web-view-element')
+      setupWebView(v8Util, webViewImplModule)
+    }
+  }
+
+  if (guestInstanceId) {
+    // Report focus/blur events of webview to browser.
+    handleFocusBlur(guestInstanceId)
+  }
+}