This is a flake with my XMonad config (previously located here).
This config is tailor-made for my use. Feel free to clone it and use it, but don't expect to "work out of the box" for you.
This flake exposes an overlay and a module.
The overlay overrides the haskellPackages.xmonad package with this one built by cabal.
The module adds some packages I need for this xmonad build and sets up the window manager part.