title: How to analyze Next Js bundle size and content
body: <p>I've just upgrated to Next JS 9.0 and when I run a build there's a fantastic new feature which shows you the size of all the compiled pages. They're all around 20-30k except for pages which use Formik which tend to be at least double that size. The main problem is that the app.js file is over 600k and red.</p>
  
  <p>Is there a way to dive further and see on a more granular level what's making up all my bundles?</p>