Ravi Shankar (a multi-talent it seems :P) ported it by hand, I think. Check out the source: http://www.adityaravishankar.com/projects/games/command-and-...

Doesn't contain anything I connect with Emscripten (stack and heap references). Actually, not even the object fields names have been obfuscated! It is quite readable. But I'd feel bad minifying a port of a game I don't own, too. Maybe that's why.

Completely ported by hand... The only external library I use is jQuery :)