main.js

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

function createWindow () {
    // Create the browser window.
    win = new BrowserWindow({width: 800, height: 600})
  
    // and load the index.html of the app.
    win.loadURL(url.format({
      pathname: path.join(__dirname, 'index.html'),
      protocol: 'file:',
      slashes: true
    }))
    win.on('close',()=>{
        win = null
    })
}

app.on("ready",createWindow)