{ lib, pkgs, config, ...}:{
  options = {
    retronix.retroarch = {
      settings = lib.mkOption {
        description = "Global settings for retroarch instances overriden by add RetroarchConfig";
        type = lib.types.attrsOf lib.types.str;
      };
      addRetroarchConfig = lib.mkOption {
        description = "Function to append retroarch config to a rom";
        type = lib.types.anything;
      };
      mapRetroarchConfig = lib.mkOption {
        description = "Function to append retroarch config to a list of rom";
        type = lib.types.anything;
      };
    };
  };

  config = {
    retronix.retroarch = {
      addRetroarchConfig =
        { additionalConfig ? {}, useBaseConfig ? true }: rom:
        rom.override {
          settings = if useBaseConfig
            then config.retronix.retroarch.settings // additionalConfig
            else additionalConfig;
        };
      mapRetroarchConfig =
        args: builtins.map (config.retronix.retroarch.addRetroarchConfig args);
    };
  };
}