[erik-kallen]

It comes with metadata for jQuery and jQueryUI, so obviously those libs can be used. I know of people using Node as well (and I hope to include that import lib in the distribution at some point).

As for porting an existing C# application, it will probably not be trivial, but the back-end stuff is most likely possible (as long as it doesn't have external references). Personally, for my own stuff I tend to compile stuff like DTOs and helpers to both Javascript (running on the client) and regular MSIL (running on the server), but that code has been written with this intent from the beginning.

I prefer to regard working with this to be writing Javascript but with tooling from 2012 instead of 1995.