Visual Studio Code uses the Roslyn platform (see here ). Same as Visual Studio 2015. On Linux and OS X, the Mono compiler is used.
The IDE itself, if basically the GitHub Atom extension (which is surprising) and, of course, does not come close to the power of full Visual Studio. But it is very clean and easy to use. Especially with the new ASP.NET 5 web applications, which are very similar to the Node.js / Angular / etc applications that many people write in simpler editors such as Sublime and Atom.
UPDATE:
The tool around it is not as rich (by and large) as in Visual Studio. Another big caveat is that debugging ASP.NET 5 applications is not supported right now (because they are compiled with Roslyn, not Mono). Only with#. However, Microsoft will add support in a future release. See here .
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