I've found Rust is great for doing heavy lifting (parsing/compiling/graph analysis, etc) on the frontend, as long as you can define the boundary between wasm/JS reasonably cleanly. And in that code I don't think there's a productivity hit as you can benefit a lot from the stricter types (ADT pattern matching, etc) and more reliable performance.
For more straightforward UI code, I'd agree that TypeScript strikes a much better balance right now, especially for (almost) seamlessly working with the wider ecosystem. I moved away from Scala.js because defining the boundary transition was quite error prone, but maybe I was missing something.
For more straightforward UI code, I'd agree that TypeScript strikes a much better balance right now, especially for (almost) seamlessly working with the wider ecosystem. I moved away from Scala.js because defining the boundary transition was quite error prone, but maybe I was missing something.