[mappu]

HTAs are tied to MSHTML.dll (the old IE renderer) and WSH/CScript is tied to the old, slow IE javascript engine, right?

I would expect this to have very limited compatibility, and even with the transpiling, very limited performance. Or is it possible for this to somehow use Chakra, or Edge's V8 engine?

[gnh1201]

Yes, the Chakra mode is also built-in. This is because Chakra (not ChakraCore) is an engine embedded in Windows. However, it has not been thoroughly tested.