[randomfool]

I don't see how these are significantly different than .PDBs which allow Windows developers to step through their source code when debugging compiled binaries.

[eckyptang]

It is similar to PDB files, which is fine but that is not the issue. The issue is that the abstraction is criminally tall. We're talking a tower of:

Process: C# --(compiler)--> Js --(parser)--> IL --(compiler)--> machine code/interpreter.

Type conversions: Static --> dynamic --> static --> none.

That's just too much to go wrong in my mind. I wouldn't touch it with a barge pole.