title: Blank page after running build on create-react-app
body: <p>Trying to deploy create-react-app on netlify, however my build is blank page. I'm using .env file for loading firebase api key is that a problem for build?</p>
  
  <p>Even when I tried to open it locally on my computer its blank page and it outputs an error in console: "Loading failed for the  with source “file:///event-app/static/js/main.108757a0.js”"</p>
  
  <p>package.json: 
  <a href="https://gist.github.com/Verthon/f82371ad2bb636b2e95c5b7697aa0bb5" rel="noreferrer">https://gist.github.com/Verthon/f82371ad2bb636b2e95c5b7697aa0bb5</a></p>
  
  <pre class="lang-sh prettyprint-override"><code>➜  event-app git:(master) ✗ npm run build
  
  &gt; event-app@0.1.0 build /home/jurr/Projects/event-app
  &gt; node scripts/build.js
  
  Creating an optimized production build...
  Compiled with warnings.
  
  ./src/components/Router.js
    Line 12:  'withFirebase' is defined but never used  no-unused-vars
  
  ./src/components/Firebase.js
    Line 21:  'Firebase' is defined but never used  no-unused-vars
  
  Search for the keywords to learn more about each warning.
  To ignore, add // eslint-disable-next-line to the line before.
  
  File sizes after gzip:
  
    282.86 KB  build/static/js/main.108757a0.js
    3.1 KB     build/static/css/main.8e671453.css
  
  </code></pre>