app.js

const electron = require('electron');
const app = electron.app;
const BrowserWindow = electron.BrowserWindow;

const path = require('path');
const url = require('url');

let mainWindow;

function createWindow () {
    mainWindow = new BrowserWindow({
        width: 1200,
        height: 800,
        webPreferences: {
            nodeIntegration: false
        }
    });

    mainWindow.loadURL(url.format({
        pathname: path.join(__dirname, 'index.html'),
        protocol: 'file:',
        slashes: true
    }));

    mainWindow.on('closed', function () {
        mainWindow = null
    });
}

app.on('ready', createWindow);

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

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