flake-parts

https://github.com/hercules-ci/flake-parts

Make monorepos awesome when using Nix flakes.

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haskell-flake

haskell-flake is a flake-parts module for Haskell development. It is used in haskell-template and in several Haskell projects.
Flake checks for Haskell

You cannot use nix flake check (unless your systems list is singular) due to IFD. You can work around this by using the check-flake flake-parts module; make the following changes to your flake.nix: