I think haskell is rapidly improving in this area. It suffered from every editor having it's own home-grown backend. Haskell IDE-Engine [1] is becoming quite st

I think haskell is rapidly improving in this area. It suffered from every editor having it's own home-grown backend. Haskell IDE-Engine [1] is becoming quite stable in my experience (using it myself) and while providing all the basic features, it's based on the Language-Server-Protocol and thus has various plugins for your favourite Editor (vscode, vim, atom, sublime etc. I personally use vscode). The development is also quite active and not run by one person anymore. I am quite pleased to be honest. [1] https://github.com/haskell/haskell-ide-engine https://github.com/haskell/haskell-ide-engine