title: Create React App production build succeeds but produces code with errors
body: <p>I have a create-react-app React application I've been developing using the webpack-dev-server, and everything works there in development.</p>
  
  <p>However, when I build for production, the output build does not work and has the following console errors:</p>
  
  <pre><code>Uncaught SyntaxError: Unexpected token &lt; :4001/static/js/1.33f1f515.chunk.js/:1
  Uncaught SyntaxError: Unexpected token &lt; :4001/static/js/main.625fef55.chunk.js/:1
  Uncaught SyntaxError: Unexpected token &lt; manifest.json:1 Manifest: Line: 1, column: 1, Unexpected token.
  </code></pre>