main.js

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

let mainWindow;

// Listen for app to be ready
app.on('ready', createWindow)

// Create new window with index.html
function createWindow () {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: true
    }
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
       mainWindow = null
  })
}


app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

app.on('activate', function () {
  if (mainWindow === null) createWindow()
})