{
  description = "";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
  };

  outputs =
    { nixpkgs
    , ...
    }:
    let
      mkSystems = sys: builtins.map (arch: "${arch}-${sys}") [ "x86_64" "aarch64" ];
      systems =
        mkSystems "linux"
        ++ mkSystems "darwin";

      forAllSystems = nixpkgs.lib.genAttrs systems;
      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });

      forEachSystem = fn:
        forAllSystems (s: fn nixpkgsFor.${s});
    in
    {
      devShells = forEachSystem (pkgs: {
        default = pkgs.mkShell {
          packages = with pkgs; [
            actionlint
            nodePackages.pnpm
          ];
        };
      });

      formatter = forEachSystem (p: p.nixpkgs-fmt);
    };
}