mark.js

import React from 'react';
import { render } from 'react-dom';
import SyntaxHighlighter from 'react-syntax-highlighter';
import { docco } from 'react-syntax-highlighter/dist/styles'
import markdown from 'markdown';

class X extends React.Component {
  render() {
    return (
      <SyntaxHighlighter language='javascript' style={docco}>
	      {markdown.markdown.toHTML('##Use npmnpm init --yes')}
      </SyntaxHighlighter>
    );
  }
}

render(<X />, document.getElementById('app'));