I can't speak to leading solutions, but in the .net world, there's Blazor[0] which is C# for the whole stack. There's also Fable[1] which is F# the whole way down.
btw. most of the time I wish my company used such things or that code would be more isomorphic, BUT!!! most of the time isomorphic models lead to way more problem, especially when it comes to validation.
[0]: https://dotnet.microsoft.com/en-us/apps/aspnet/web-apps/blaz...
[1]: https://fable.io/