Tiny QuickApp Emulator (TQAE) started out as a simple modular QuickApp emulator but have evolved into a pretty good development environment.
(Great intro to TQAE < Please login or register to see this link. > from @Joep - thanks!)
If you want to use vscode, I recommend Please login or register to see this link. that I'm currently focusing my development efforts on.
/ Please login or register to see this link. 60 -- Main emulator, loads other modules