{
  lib,
  config,
  ...
}: let
  inherit
    (lib)
    mkOption
    types
    ;

  outputs = mkOption {
    type = types.submoduleWith {
      modules = [
        {
          freeformType =
            types.lazyAttrsOf
            (types.unique
              {
                message = ''
                  No option has been declared for this flake output attribute, so its definitions can't be merged automatically.
                  Possible solutions:
                    - Load a module that defines this flake output attribute
                    - Declare an option for this flake output attribute
                    - Make sure the output attribute is spelled correctly
                    - Define the value only once, with a single definition in a single module
                '';
              }
              types.raw);
        }
      ];
    };
    description = ''
      Raw flake output attributes. Any attribute can be set here, but some
      attributes are represented by options, to provide appropriate
      configuration merging.
    '';
  };
in {
  options = {
    inherit outputs;
  };

  config = {inherit (config) flake;};
}