My impression with Scala.js is that it's nice (and maybe the best option going at the moment) but you're still kind of a second-class citizen, which I'm hoping WASM will change. I imagine the experience with BuckleScript would be similar. (Whereas Typescript feels a lot more first-class, but at the cost of having to still be semantically very close to Javascript).
I am looking into TypeScript right now and I think it's just a hard problem to integrate a typed language into a dynamic environment like JavaScript. The transitions between JavaScript and the typed language will always be tricky and error prone.
PureScript doesn't do a bad job either. And even Haskell (GHCJS) has good FFI into JavaScript (I'd argue even better than PureScript!). How bad can you make interop between a higher-level language and JS? What are the bad examples?
