main.js

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

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow;

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 400,
    height: 300,
  });

  mainWindow.setMenu(null);

  mainWindow.loadFile('index.html');

  // mainWindow.webContents.openDevTools();

  // Emitted when the window is closed.
  mainWindow.on('close', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null;
  });
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow);

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  app.quit();
});

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.