> Ideally I'd find a functional language with row polymorphism that also had a great ecosystem, but that's asking for too much. Your best bet here would be Res

> Ideally I'd find a functional language with row polymorphism that also had a great ecosystem, but that's asking for too much. Your best bet here would be Rescript, OCaml or Purescript and leverage the JS ecosystem. There's also http://www.ocamljava.org/ http://www.ocamljava.org/, which seems to be not really active. I'm not sure if I would call any option great though.