{ self, flake-utils, nixpkgs, ... }: (flake-utils.lib.eachDefaultSystem ( system: let pkgs = nixpkgs.legacyPackages.${system}; formatter = self.formatter.${system}; in { checks = { format = pkgs.runCommand "check-format" { buildInputs = [ formatter ]; } "${formatter}/bin/nixpkgs-fmt --check ${./.} && touch $out"; }; } )).checks