4) This is an insane idea, but one that came to mind.
I'm testing this by piping the generated JS into
dmdscript.

dmd runs insanely fast when compiling this code. Phobos
is kinda slow to compile, but you don't have to use it
here. Write D1 style code and dmd is blink of an eye.

dmdscript is reasonably fast too.



Suppose you're writing an app and you want a scripting
extension. Embed dmdscript, boom you can use javascript.

(I really want to revive a dmdscript D2 port to make this
even easier, but it isn't hard right now either.)


What if you want to script in D? If you're GPL... embed
dmd front end too.


Make D output JS, which is interpreted by D, calling
D apis....


Pretty insane, but you could script your app in D without
doing shared libraries or anything like that!