{
  theme,
  inputs,
  pkgs,
  lib,
  ...
}:
let
  def = {
    default = false;
  };
  null = {
    default = null;
  };
in
with lib;
with lib.types;
{
  # ylib & stylix
  umport = inputs.nypkgs.legacyPackages.${pkgs.system}.lib.umport;
  base16 = "${inputs.design}/base16/${theme}.yaml";
  # enable = true; ++ enable = false;
  True = {
    enable = true;
  };
  False = {
    enable = false;
  };
  # mkOption and mkEnableOption
  mkEnable = mkEnableOption "";
  mkBool = mkOption def // {
    type = bool;
  };
  mkOpt = {
    str = mkOption def // {
      type = str;
    };
    list = {
      pkgs = mkOption null // {
        type = listOf package;
      };
      str = mkOption null // {
        type = listOf str;
      };
    };
    attrs = {
      str = mkOption null // {
        type = attrsOf str;
      };
    };
  };
}