This is useful if you're wanting to use React going forward but perhaps you have to support a lot of legacy before a switch. This will allow you to develop your react component library whilst maintaining any output required for legacy systems. Win win win.
In your addons.js
add the following line:
import 'storybook-react-to-html-addon/register';
In your story file add the following import:
import withShowHtml from 'storybook-react-to-html-addon';
Then within your story add: addDecorator(withShowHtml)
e.g.
storiesOf('Example', module)
.addDecorator(withShowHtml)
.add('Default', () => (
<MyReactComponent />
))