main.js

'use strict';
const electron = require('electron');
const chokidar = require('chokidar'); // add chokidar

const app = electron.app; // this is our app
const BrowserWindow = electron.BrowserWindow; // This is a Module that creates windows  

let mainWindow; // saves a global reference to mainWindow so it doesn't get garbage collected

app.on('ready', createWindow); // called when electron has initialized

// tell chokidar to watch these files for changes
// reload the window if there is one
chokidar.watch(['ports.js', 'index.html', 'index.js']).on('change', () => {
    if (mainWindow) {
        mainWindow.reload();
    }
});

// This will create our app window, no surprise there
function createWindow () {
    mainWindow = new BrowserWindow({
        width: 1024,
        height: 768
    });
    // hide the menu bar
    mainWindow.setMenuBarVisibility(false);
    // display the index.html file
    mainWindow.loadURL(`file://${ __dirname }/index.html`);
    // // open dev tools by default so we can see any console errors
    // mainWindow.webContents.openDevTools();
    mainWindow.on('closed', function () {
        mainWindow = null;
    });
}

/* Mac Specific things */

// when you close all the windows on a non-mac OS it quits the app
app.on('window-all-closed', () => {
    if (process.platform !== 'darwin') { app.quit(); }
});

// if there is no mainWindow it creates one (like when you click the dock icon)
app.on('activate', () => {
    if (mainWindow === null) { createWindow(); }
});