[gavinray]

There are already several libraries that allow you to write React-like SPAs in the browser via WASM.

The two largest are Yew (Rust), Vugu (Vue-esque but with Go instead of JS), and Blazor (C#)

https://github.com/yewstack/yew

https://github.com/vugu/vugu

https://github.com/aspnet/Blazor

All are perfectly viable for production apps as of today and not much more difficult than writing React, given you have some familiarity with their implementation language.