chore: always lint JS in docs/fiddles (#38025)

docs/fiddles/features/offscreen-rendering/main.js

@@ -4,16 +4,31 @@ const path = require('path')
 
 app.disableHardwareAcceleration()
 
-let win
+function createWindow () {
+  const win = new BrowserWindow({
+    width: 800,
+    height: 600,
+    webPreferences: {
+      offscreen: true
+    }
+  })
 
-app.whenReady().then(() => {
-  win = new BrowserWindow({ webPreferences: { offscreen: true } })
   win.loadURL('https://github.com')
   win.webContents.on('paint', (event, dirty, image) => {
     fs.writeFileSync('ex.png', image.toPNG())
   })
   win.webContents.setFrameRate(60)
   console.log(`The screenshot has been successfully saved to ${path.join(process.cwd(), 'ex.png')}`)
+}
+
+app.whenReady().then(() => {
+  createWindow()
+
+  app.on('activate', () => {
+    if (BrowserWindow.getAllWindows().length === 0) {
+      createWindow()
+    }
+  })
 })
 
 app.on('window-all-closed', () => {
@@ -21,9 +36,3 @@ app.on('window-all-closed', () => {
     app.quit()
   }
 })
-
-app.on('activate', () => {
-  if (BrowserWindow.getAllWindows().length === 0) {
-    createWindow()
-  }
-})