title: ReactJS can't import 'react-router-dom' anymore
body: <p>A few days ago I just worked fine on my website, and could use the following syntax: 
  'import { BrowserRouter as Router, Route, Link } from "react-router-dom";' 
  in my program.
  But today, when I wanted to go on with programming my website I got the following errors in console: <code>https://pastebin.com/FXqKAyzd</code></p>
  
  <hr>
  
  <p>This is odd tho because it worked just fine a few days ago. So I thought, maybe there was an update, and I updated 'react-router' and 'react-router-dom' to the newest version (at the time being: '5.0.0'). I hope someone can tell me, how to fix this, and why it says <code>import Router from "react-router/es/undefined"</code> &lt;- <code>undefined</code>? and what <code>the support for the latter</code> is?</p>