You can search for identifiers within the package.
in-package search v0.2.0
val user_dir : ?xdg_env:t -> ?exists:bool -> unit -> dirname
val system_dirs : ?xdg_env:t -> ?exists:bool -> unit -> dirname list
val all_dirs : ?xdg_env:t -> ?exists:bool -> unit -> dirname list
val user_file : ?xdg_env:t -> ?exists:bool -> filename -> filename
val system_files : ?xdg_env:t -> ?exists:bool -> filename -> filename list
val all_files : ?xdg_env:t -> ?exists:bool -> filename -> filename list