That's pretty awesome. I love Lua lately, for its simplicity both in design and implementation, and it's great to see that I can use it in an MCU! That said, it's pretty dumb that it has to have a JS transpiler in order to get popular.
It could be a really interesting tool for porting (some) javascript npm modules to luvit (a nodejs reimplementation with lua instead of js) as well :-)
Just seems like an interesting way to bolster the ecosystem :-)