You can search for identifiers within the package.
in-package search v0.2.0
camlimages.freetype
Fttext.T
type t
type elt
val create : int -> int -> t
val destroy : t -> unit
val get : t -> int -> int -> elt
val set : t -> int -> int -> elt -> unit
val unsafe_get : t -> int -> int -> elt
val unsafe_set : t -> int -> int -> elt -> unit