Hi! I wanted to advertise my package rp-codemirror, which lets you create interactive code recordings by recording your keystrokes and then playing them back to a CodeMirror instance. You can see an example (and explanation of the technology) at https://ractive-player.org/?t=1:41.2.
Currently this only supports CodeMirror 5, but I’ll be taking a crack at CodeMirror 6 soon.