Yes, the KA developers for the editor replace "let" and "const" with var (handling errors by hand), and eval the modified code. They also do other "post-processing" to your code such as changing the way "new" works.
Its because theyre using an outdated library that hasn't been supported since 2018 :( I've put in a feature request for KA to move to the new version of that library, but I don't know if they actually will or not
Log ind for at efterlade en kommentar.