XMonad dev environmet

[lycheese]

Hi,

I'm currently using a user profile to manage xmonad with my xmonad.hs inside of my config folder. I'd like to get completion when working on xmonad.hs but that doesn't work since the packages aren't available in the global or devos environments. What is the best way to get this working? Should I modify the devos environment or should I nest nix-shells? Also how would I go about not duplicating the package list between my xmonad/default.nix and the nix-shell environment?