main.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: 1020, height: 625 });

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

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

app.commandLine.appendSwitch('ignore-certificate-errors');

app.on('ready', createWindow);

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

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