{ lib, ... }:
{

  type = lib.types.submodule {
    options = {
      class = lib.mkOption {
        description = "Matches the window class reported by the compositor.";
        type = lib.types.str;
        example = ".*[Ff]irefox.*";
      };

      icon = lib.mkOption {
        description = "Sets the icon shown for matching windows.";
        type = lib.types.str;
        example = "";
      };
    };
  };
}