Comment by crooked-v

Dang, that's a neat tool. It's different enough from a Node environment, though, including some of the necessary rewrites of stuff, that I wonder if a "more Node-y" sandbox would be more useful for this particular case. An example: https://codesandbox.io/s/r0kwk0o28p (I tweaked the rule number, column width, and output to print to the page, but otherwise it's the same as the original.)