title: create-react-app exclude folder from triggering reload
body: <p>I have a use case where I'm dynamically storing a pdf file in my public folder.
  <code>public/print-preview/</code>.</p>
  
  <p>The issue here is that the application reloads and the state gets lost after such a file was created and stored.</p>
  
  <p>How can I exclude such a folder from being watched? And is there a way to achieve this without ejecting?</p>