{
  outputs = { self, nixpkgs, systems }: let
    eachSystem = f: nixpkgs.lib.genAttrs (import systems) (system: f { inherit system; pkgs = nixpkgs.legacyPackages.${system}; });
  in {
    devShells = eachSystem ({pkgs, ...}: {
      default = pkgs.mkShell {
        packages = [pkgs.rakudo pkgs.just pkgs.watchexec];
      };
    });
  };
}