`haskell-flake`

A flake-parts module for Haskell development, originally extracted from haskell-template.

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Philosophy

I wish to keep all the Nix code (flake.nix) as small and simple as possible. This is why much of the Nix is delegated to haskell-flake. Consequently, it also becomes easier for the user to do some Nix-based Haskell workflows (I’m yet to document these).
Flake checks for Haskell

haskell-flake provides a builtin list of flake checks that you can manually enable:
Adding library dependencies

Build it using callCabal2nix and assign it to the ema name in the Haskell package set by adding it to the overrides argument of your flake.nix that is using haskell-flake:

Step (3) above will try to fetch the package from the Haskell package set in nixpkgs (the one that is pinned in flake.lock), and this package set (which is ultimately derived from Stackage sets) sometimes may not have the package you are looking for. A common reason is that it is marked as “broken” or it simply doesn’t exist. In such cases, you will have to override the package in the overrides argument of haskell-flake (see the next section).