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

  outputs =
    { nixpkgs, ... }:
    let
      forAllSystems =
        function:
        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
          system: function nixpkgs.legacyPackages.${system}
        );
    in
    {
      formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);

      devShells = forAllSystems (pkgs: {
        default = pkgs.callPackage ./nix/shell.nix { };
      });

      packages = forAllSystems (pkgs: {
        default = pkgs.callPackage ./nix/default.nix { };
      });
    };
}