main.js

const
	electron = require('electron'),
	{app, BrowserWindow, ipcMain, dialog} = electron,
	{writeFileSync} = require('fs'),
	path = require('path'),
	url = require('url');

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow;

function createWindow() {
	// Create the browser window.
	mainWindow = new BrowserWindow({
		width: 1280,
		height: 800,

	});

	mainWindow.setMenuBarVisibility(false);

	// and load the index.html of the app.
	mainWindow.loadURL(url.format({
		pathname: path.join(__dirname, '.compiled/index.html'),
		protocol: 'file:',
		slashes: true
	}));

	// Open the DevTools.
	//mainWindow.webContents.openDevTools();

	// Emitted when the window is closed.
	mainWindow.on('closed', () => {
		// Dereference the window object, usually you would store windows
		// in an array if your app supports multi windows, this is the time
		// when you should delete the corresponding element.
		mainWindow = null;
	});
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow);

// Quit when all windows are closed.
app.on('window-all-closed', () => {
	// On OS X it is common for applications and their menu bar
	// to stay active until the user quits explicitly with Cmd + Q
	if (process.platform !== 'darwin') {
		app.quit();
	}
});

app.on('activate', () => {
	// On OS X it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (mainWindow === null) {
		createWindow();
	}
});

ipcMain.on('save-qrcode', (event, qrCode) => {
	const options = {
		title: 'Save QR Code',
		filters: [
			{name: 'PNG Image', extensions: ['png']}
		]
	};

	dialog.showSaveDialog(options, (filename) => {
		if (!filename) return;

		writeFileSync(filename, qrCode);

		event.sender.send('saved-qrcode', filename);
	});
});