{ inputs, self, lib, ... }: {
  imports = [ inputs.treefmt-nix.flakeModule inputs.git-hooks-nix.flakeModule ];

  perSystem = { pkgs, ... }: {
    treefmt.config = {
      projectRootFile = ".git/config";
      programs.nixfmt.enable = true;
    };

    pre-commit.settings.hooks = { nixfmt.enable = true; };

    formatter = pkgs.nixfmt-rfc-style;
  };

  flake.checks = let build = _: nc: nc.config.system.build.toplevel;
  in {
    x86_64-linux =
      lib.mapAttrs build { inherit (self.nixosConfigurations) picard; };
    aarch64-linux = lib.mapAttrs build {
      inherit (self.nixosConfigurations) sisko; # pbp;
    };
  };
}