[dmjio]

If you want a powerful type system (i.e. Haskell), but the benefits of Elm, Miso is a project that implements the Elm Architecture in Haskell. It obviously has typeclasses, and can encode / decode JSON on the frontend using GHC.Generics quite well. https://github.com/dmjio/miso

[masklinn]

There's also Purescript, which is built for the web but has many of the goodies you'd expect from Haskell.

[kahnpro]

I tried out Purescript for a project and didn't think it's ready for production... Generic encoding/decoding was painful, the lack of good dependency management was painful, too many things were either missing or immature. I hope in a year or two the story will be better.

[KirinDave]

PureScript is a rapidly moving target. When did you try?

[reitanqild]

Eh, I don't know PureScript but IMO you just added another reason why it isn't production ready.

Unless they are really really good at keeping backwards compability in both language and build tools.

[KirinDave]

Nope, they break things all the time. Or at least, they did one major break earlier this year. "Production ready" is different from "should I use this ever at all though."

Doesn't really answer the question I posed though.

[agentultra]

And GHCJS is quite good these days as well.