title: Running existing react js app
body: <p>When i am running existing react js app, it stuck here</p>
  
  <pre><code>fallbackLoader option has been deprecated - replace with "fallback"
  loader option has been deprecated - replace with "use"
  Building for undefined
   10% building modules 2/2 modules 0 active                                         
  Project is running at http://localhost:8080/
  webpack output is served from /
  404s will fallback to /index.html
   95% emittingTotal precache size is about 0 B for 0 resources.                             
   95% emittingTotal precache size is about 0 B for 0 resources.
  </code></pre>
  
  <p>it is not showing any error and for this app is not running on browser.
  Can anyone help with this issue?</p>