init

src/config.json

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+{
+	"url": "http://localhost:3000"
+}

src/environment.js

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+const { app } = require('electron');
+const fs = require('fs');
+const path = require('path');
+const packageJson = require('../package.json');
+
+let config, loaded = false, prod = app.isPackaged;
+const configPath = path.join(__dirname,'./config.json');
+
+try {
+	config = fs.readFileSync(configPath, 'utf-8');
+	config = JSON.parse(config);
+	loaded = true;
+} catch {
+	config = {};
+}
+
+module.exports = Object.assign({
+	loaded,
+	path: configPath,
+	production: prod,
+	version: packageJson.version,
+}, config);

src/main.js

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+const dns = require('dns');
+const env = require('./environment');
+const electron = require('electron');
+const fs = require('fs');
+const http = require('http');
+const https = require('https');
+const path = require('path');
+
+let win;
+const iconPath = path.join(__dirname, 'favicon.png');
+
+// Check internet connectivity
+async function online() {
+	return new Promise(resolve => {
+		dns.lookup('google.com', err => resolve(!err));
+	});
+}
+
+// Download icon
+async function downloadIcon() {
+	if(!await online()) return Promise.resolve();
+	const iconUrl = `${env.url}/favicon.png`;
+	return new Promise((resolve, reject) => {
+		const file = fs.createWriteStream(iconPath);
+		const proto = env.url.startsWith('https://') ? https : http;
+		proto.get(iconUrl, res => {
+			if(res.statusCode !== 200) return; // Incase we are offline
+			res.pipe(file);
+			file.on('finish', () => file.close(resolve));
+		}).on('error', reject);
+	});
+}
+
+async function createWindow() {
+	await downloadIcon();
+	win = new electron.BrowserWindow({
+		width: 1000,
+		height: 800,
+		icon: iconPath,
+		webPreferences: {
+			preload: path.join(__dirname, 'preload.js'),
+			contextIsolation: true,
+			enableRemoteModule: false,
+			nodeIntegration: false
+		}
+	});
+
+	win.setMenu(null);
+	electron.globalShortcut.register('Control+Shift+I', () => {
+		if (win) win.webContents.openDevTools();
+	});
+
+	electron.ipcMain.on('electron-environment', (event) => event.returnValue = env);
+
+	win.loadURL(env.url);
+
+	win.on('closed', () => win = null);
+}
+
+electron.app.on('ready', createWindow);
+electron.app.on('activate', () => { if(win === null) createWindow(); });

src/preload.js

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+const {contextBridge, ipcRenderer} = require('electron');
+
+contextBridge.exposeInMainWorld('electronEnvironment', () => ipcRenderer.sendSync('electron-environment'));