You can search for identifiers within the package.
in-package search v0.2.0
val lowercase : string -> string
val mapi : (int -> 'a -> 'b) -> 'a list -> 'b list
val lazy_from_fun : (unit -> 'a) -> 'a Lazy.t
val trim : string -> string
val index_opt : string -> char -> int option
val index_from_opt : string -> int -> char -> int option
val split_on_char : char -> string -> string list
val list_find_opt : ('a -> bool) -> 'a list -> 'a option
val getenv_opt : string -> string option