RT Micah Godbolt
This is really huge. There are a number of ways to import packages into a pen (in the html tab, in html settings, in JS settings) but none of them let you put everything into the JS pane.
Now you can EASILY convert demo code from internal demo to codepen demo too.
Chris Coyier: Blog post on that:
I enjoy slapping little demos together with it, so quick and easy to play
https://blog.codepen.io/2020/12/18/fixing-imports-with-skypack/
https://codepen.io/chriscoyier/pen/BazXPzp