You can search for identifiers within the package.
in-package search v0.2.0
type t
type character
val empty : t
val is_whitespace : character -> bool
val length : t -> int
val find : ?from:int -> ?length:int -> t -> f:(character -> bool) -> int option
val find_reverse : ?from:int -> ?length:int -> t -> f:(character -> bool) -> int option
val sub_exn : t -> index:int -> length:int -> t