[toolslive]

You don't have to use TypeScript if you don't want to: you can compile Haskell, Ocaml, Rust, F#, ... to javascript. This is quite efficient, especially if your backend is already in one of those languages. It saves you from creating the same abstraction twice in different languages.

[esafak]

How does that work with JS frameworks like React, since most development takes place with them?

[toolslive]

it's not that different compared to using the FFI.

The link below shows how it can work for Ocaml <-> TypeScript.

https://github.com/ocsigen/ts2ocaml