esnextbin/devServer.js

Prototype JavaScript programs in the browser with ESNext (a.k.a ES2015) syntax and features, using modules from NPM.

const express = require('express');
const port = process.env.PORT || 9292;
const app = express();

app.use(express.static(__dirname));
app.listen(port);

console.log('dev server started on http://localhost:%s', port);