electron/spec-main/fixtures/api/test-menu-null/main.js

const { app, BrowserWindow } = require('electron')

let win
app.whenReady().then(function () {
  win = new BrowserWindow({})
  win.loadURL('about:blank')
  win.setMenu(null)

  setTimeout(() => {
    if (win.isMenuBarVisible()) {
      console.log('Window has a menu')
    } else {
      console.log('Window has no menu')
    }
    app.quit()
  })
})