Pure D frontend as library.

[Alexandru Ermicioi via Digitalmars-d-learn]

Hi team,

I'd like to ask a lazy question:
How easy is to use D compiler frontend without backend?
How complicated would be to write a transpiler, and from which 
files should you start modifications?

I'm wondering if something like 
https://typescripttolua.github.io/ could be done, but with d as 
language.

From my limited knowledge, I should have an AST visitor that 
transpiles to target language, and some entry point for 
application which configures D frontend to use my AST visitor to 
generate code. I've no idea from where to start. If you know some 
documentation or tutorials, that would be appreciated.

Thanks,
Alexandru.