[vajrabum]

This thing compiles scratch to Javascript with a claimed 10 to 100 speedup. Here's a bit from the docs on how it works. https://docs.turbowarp.org/how

And here's the source. https://github.com/TurboWarp/

From the doc and a quick glance at the repo it looks like it's scratch modified to compile to javascript. No surprise that you can't live edit, at least not for now.