{ lib, ... }:
with lib;
{
  config.outputKinds = [
    (
      { hasSystem, ... }:
      optionalAttrs hasSystem {
        options = {
          apps = mkOption {
            type =
              with types;
              attrsOf (submodule {
                options = {
                  type = mkOption {
                    type = enum [ "app" ];
                    default = "app";
                  };
                  program = mkOption {
                    type = path;
                    description = "An executable to run";
                  };
                  meta = mkOption {
                    type = attrs;
                    description = "App metadata";
                    default = { };
                  };
                };
              });
            description = "Executed by `nix run .#<name>`";
          };
        };
        outputs = { config, system, ... }: {
          apps.${system} = config.apps;
        };
      }
    )
  ];
}