old_contents: 'use strict';
  
  var React = require('react'),
      Catalog = require('../components/catalog.jsx'),
      Cart = require('../components/cart.jsx'),
  
      App   = React.createClass({
    render: function render() {
      return (
        <div>
          <h1>My Store</h1>
          <hr />
          <Catalog />
          <hr />
          <Cart />
        </div>
      );
    }
  });
  
  module.exports = App;
  
new_contents: 'use strict';
  
  var React = require('react'),
  
      Header = require('./header.jsx'),
  
      App;
  
  App = React.createClass({
    render: function render() {
      return (
        <div>
          <Header />
        </div>
      );
    }
  });
  
  module.exports = App;
  
subject: use Header component