title: process is not defined on hot reload
body: <p>I have a react app made with create react app, and hot reloading kills the page entirely with the error:</p>
  <pre><code>Uncaught ReferenceError: process is not defined
  </code></pre>
  <p>What's strange is that there seems to be an iframe injected which I never noticed before:</p>
  <p><a href="https://i.stack.imgur.com/BB6mg.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BB6mg.png" alt="enter image description here" /></a></p>
  <p>This iframe is added to the DOM as soon as I reload and breaks the page as well as preventing an update. I can't find any documentation on &quot;iframe-bundle.js&quot; online.</p>
  <p>Edit: I tried deleting my node modules and any questionable imports (I temporarily installed <code>craco</code> prior). Still the same issue. It's incredibly annoying!</p>
  <p>Edit 2: If I delete that iframe everything seems to return to normal, i.e. page updates and is interactable</p>