You can search for identifiers within the package.
in-package search v0.2.0
module L = BatList
val stddev : float list -> float
val enforce : bool -> (unit -> string) -> unit
val prepend2 : 'a -> ('b * 'c) -> 'd * 'e * 'f
val prepend3 : 'a -> ('b * 'c * 'd) -> 'e * 'f * 'g * 'h
val fst4 : ('a * 'b * 'c * 'd) -> 'e
val trd4 : ('a * 'b * 'c * 'd) -> 'e
val frt4 : ('a * 'b * 'c * 'd) -> 'e
val combine3 : 'a list -> 'b list -> 'c list -> ('a * 'b * 'c) list
val with_temp_file : string -> string -> string -> (string -> 'a) -> 'b