I tried (and sort of failed) to build something like this for rust [0] (warning it's broken at the moment).

It's a lot harder than I expected. Especially since the terminal has no notion of focus, and with Rust it's really hard to not just clone everything you get your hands on when writing a UI library. The borrow checker really feels like it gets in the way of features like signals [1], and partial re-renders.

[0]: https://docs.rs/intuitive/latest/intuitive/ [1]: https://preactjs.com/guide/v10/signals/