type t = Elm.themeval _new : unit -> tval free : t -> unitval default_get : unit -> tval overlay_add : ?th:t -> string -> unitval overlay_del : ?th:t -> string -> unitval overlay_list_get : t -> string listval extension_add : ?th:t -> string -> unitval extension_del : ?th:t -> string -> unitval extension_list_get : t -> string listval set : ?th:t -> string -> unitval get : ?th:t -> unit -> stringval list_get : ?th:t -> unit -> string listval flush : ?th:t -> unit -> unitval data_get : ?th:t -> string -> string optionval group_path_find : ?th:t -> string -> string optionval group_base_list : ?th:t -> string -> string list