Haskell in CodeMirror 6

CodeMirror 6 is an editor which supports many programming languages. However, it lacks first-class language support for Haskell. The Abstract Syntax Tree is missing, because a compatibility shim is used, instead of a proper parser. Also, there are several problems with recovering from source code errors.

The idea of this project is to add first-class Haskell language support. The primary objective is to ensure full functionality, having any syntactic or semantic error detected and handled. Another aim is to make the code as modular as possible, such that it would be easily extended.