title: Blacklisting react-native module doesnt works
body: <p>I have a project folder which contains both Web and Mobile application developed on React and React-native, There is a dependency for web which adds SymLink in the postinstall script, The problem I am facing is React-native Packager server also picks up that symlink and App doesnt work correctly.
  At first I followed this- <a href="https://stackoverflow.com/questions/41813211/how-to-make-react-native-packager-ignore-certain-directories">how to make react native packager ignore certain directories</a> but getBlacklistRE silently ignores whatever Regex I am passing. </p>
  
  <p><strong>EDIT</strong>
  This is the actual issue I am facing and I have tried implemented all the solutions mentioned there but no success yet. - <a href="https://github.com/facebook/react-native/issues/19763" rel="nofollow noreferrer">https://github.com/facebook/react-native/issues/19763</a></p>
  
  <p><strong>EDIT2</strong>
  Now seems to me blacklisting not working and it could also happen due to clashes between the babel version I am using in web and that of React Native below is my package.json
  <a href="https://i.stack.imgur.com/1XGME.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1XGME.png" alt="enter image description here"></a></p>