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Does anyone know if there is work being done to add JSX syntax to C# (either into the language directly or as part of a pre-processor)?

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The CSharpLang github[1] repository would be where to look for this. I didn't find anything that mentioned adding language support for it, and IIRC, in the past they rejected the idea of inline XML or JSON support.

Going the other way of C# inside HTML, you have Razor[2] and Blazor[3], the latter of which is a prototype of Razor running in the browser via web assembly.

[1]: https://github.com/dotnet/csharplang [2]: https://docs.microsoft.com/en-us/aspnet/core/mvc/views/razor [3]: http://blog.stevensanderson.com/2017/11/05/blazor-on-mono/

Blazor is pretty amazing, but my coder fantasies mostly revolve around a React-JSX-in-C# vision - the syntax and approach just feel so natural and so right. Your point about rejecting inline XML is probably a pretty good data point that I shouldn’t expect what I’m hoping for to happen.

Well, if you would use VB.NET instead, it supports XML literals.

Investigate a possibility to support JSX | https://github.com/bridgedotnet/Bridge/issues/808

Bridge.NET translates C# to JavaScript, but JSX is not currently supported.

I like Bridge.NET but I’m not sure how they will survive once the current Mono WebAssembly tech hits release.

WebAssembly does not cover use cases that require a ton of C#<->JS interop, and it may never adequately cover it. You end up needing a very complex interop bridge similar to C<->JS interop. A solution like Bridge can compile to JS, making interop near-zero-cost.

Thanks for fantastic answer to my concern (for those who might object that kevingadd didn’t cite his sources, given his background he pretty much -is- a primary source)

Why would you pick jsx instead of TSX?

JSX is the the syntax for embedding HTML in a non-HTML language. TSX is just a file extension implying that the non-HTML language is typescript, which it wouldn’t be here because C#.

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