What is the most production-level Haskell to JavaScript compiler, to write code running in the browser? [closed]

Answer 1

While GHCJS does not seem to be actively maintained, Emscripten seems to be quite current.

• Emscripten compiles LLVM bitcode to JavaScript.
• GHC's LLVM backend appears to be actively developed.
• Intuitively, to answer the question, the following pipeline might not be very far from "production quality": Haskell lexemes (-> GHC ->) LLVM lexemes (-> Emscripten ->) JavaScript lexemes

I'll admit that this is a speculative post.