[m_j_g]

I am very happy with Elm on frontend. When working with Haskell I tend to generate most of frontend types for Elm directly from haskell with elm-street (https://hackage.haskell.org/package/elm-street)

The downside of Elm simplicity in comparison to haskell is inability to express even simplest typeclases like Ord, or very useful constructions like Lenses.