Reusing ES6 React Component on Server Side (yup, node.js does not support ES6 yet, so this is a hack using Babel)

default.js

var express = require('express');
var router = express.Router();
var babel = require("babel-core");
var React = require('react');
// Get ReactDOMServer for server side rendering
var ReactDOMServer = require('react-dom/server');

// Compile code transformed by babel.transformFileSysnc 
module._compile(babel.transformFileSync('./public/js/components/header.js').code);
// Save it to a accessible header before moudle.exports gets replaaced
var Header = module.exports;

// Create markup from newly acquired React Component
var headerMarkup = ReactDOMServer.renderToStaticMarkup(React.createFactory(Header)());

module.exports = function (app) {
   app.use('/', router);
};

router.get('/help', function(req, res) {
   res.render('help', {header: headerMarkup});
});

router.get('/about', function(req, res) {
   res.render('about', {header: headerMarkup});
});