refactor: convert more files to typescript (#16820)

lib/browser/default-menu.ts

@@ -0,0 +1,54 @@
+import { shell, Menu } from 'electron'
+
+const v8Util = process.atomBinding('v8_util')
+
+const isMac = process.platform === 'darwin'
+
+export const setDefaultApplicationMenu = () => {
+  if (v8Util.getHiddenValue<boolean>(global, 'applicationMenuSet')) return
+
+  const helpMenu: Electron.MenuItemConstructorOptions = {
+    role: 'help',
+    submenu: [
+      {
+        label: 'Learn More',
+        click () {
+          shell.openExternalSync('https://electronjs.org')
+        }
+      },
+      {
+        label: 'Documentation',
+        click () {
+          shell.openExternalSync(
+            `https://github.com/electron/electron/tree/v${process.versions.electron}/docs#readme`
+          )
+        }
+      },
+      {
+        label: 'Community Discussions',
+        click () {
+          shell.openExternalSync('https://discuss.atom.io/c/electron')
+        }
+      },
+      {
+        label: 'Search Issues',
+        click () {
+          shell.openExternalSync('https://github.com/electron/electron/issues')
+        }
+      }
+    ]
+  }
+
+  const macAppMenu: Electron.MenuItemConstructorOptions = { role: 'appMenu' }
+  const template: Electron.MenuItemConstructorOptions[] = [
+    ...(isMac ? [macAppMenu] : []),
+    { role: 'fileMenu' },
+    { role: 'editMenu' },
+    { role: 'viewMenu' },
+    { role: 'windowMenu' },
+    helpMenu
+  ]
+
+  const menu = Menu.buildFromTemplate(template)
+  Menu.setApplicationMenu(menu)
+}