What does HackerNews think of roslyn?
The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.
For a random example, here is the analyzer finding variable swaps of the form
tmp = a;
a = b;
b = tmp;
And here is the code fix that automatically performs the substitution: https://github.com/dotnet/roslyn/blob/main/src/Analyzers/CSh...
Most of the heavy lifting in OmniSharp is done by Roslyn [0]. Roslyn is the open source C# compiler and code analysis library maintained by MS. You cannot overstate how much effort has gone into Roslyn, and how much money MS has invested to make it work. OmniSharp is essentially a wrapper[1] around Roslyn (before Roslyn it was Mono), and while the OmniSharp team did a nice job developing a nice intellisense UX around it all, it is not like MS is taking it all away from them. Incidentally, it is almost certain that new intellisense plugin by MS will also be built on top of Roslyn.
[0] https://github.com/dotnet/roslyn [1] https://github.com/OmniSharp/omnisharp-vscode#the-c-extensio...
I have sometimes pondered whether to try making a system that kind of rhymed with Smalltalk, but using Roslyn[0] instead. Although I envisage it as being a kind of playground where you code like Smalltalk, with the artifacts being produced as conventional class files and whatnot so the final build could be done with the normal command line tools.
https://github.com/dotnet/roslyn (c#)
https://github.com/dotnet/winforms (UI) https://github.com/dotnet/wpf (UI) https://github.com/dotnet/core (Foundation)
I don't consider the Win32 API itself part of .NET or C# as they've existed long before either.
The C# compiler is called Roslyn which might not be obvious for people trying to find it on GitHub - it's incredibly well supported, regularly updated, and lively: