title: GitHub Code highlighting for React file with js extension
body: <p>If you create a React file but save it with <code>.js</code> extension, then GitHub code highlighting breaks when it reaches a single quote in text. Saving the same file in <code>.jsx</code> works fine.</p>
  
  <p>See example on <a href="https://github.com/ktalebian/react-highlighting-problem" rel="nofollow">this repo</a>. Both file <code>correct-highlighting.jsx</code> and <code>incorrect-highlighting.js</code> have the same content. As you can, the <code>.js</code> has wrong syntax highlighting.</p>
  
  <p>Is there anyway to fix this, while still using <code>.jx</code> extension?</p>