title: During Heroku Post Build, Cannot find file
body: <p>This is a react application, with styled components, with a Node backend being deployed to Heroku via <code>git push heroku master</code></p>
  
  <p>I import the style for each component from a separate file  with <code>import {...} from './style'</code>. </p>
  
  <p>Where the file structure is:</p>
  
  <p><code>OptionsCarousel
      |index.js
      |style.js
  </code></p>
  
  <p>This makes perfect sense to me, and works locally both via <code>npm start</code> and <code>npm run build -&gt; serve -s build</code>. With no issues. But when deploying to Heroku, during the optimization build stage, it fails with the error:</p>
  
  <p><code>
  remote:        Creating an optimized production build...
  remote:        Failed to compile.
  remote:
  remote:        ./src/OptionsCarousel/index.js
  remote:        Cannot find file './style' in './src/OptionsCarousel'.</code></p>
  
  <p>Any advice on a better way to structure this, and what is causing the issue would be greatly appreciated. </p>