You can search for identifiers within the package.
in-package search v0.2.0
tube
Tube.Make
module Material : sig ... end
type t = Material.t
type reader
type writer
val create : unit -> reader * writer
val write : t -> writer -> unit Lwt.t
val write_with_pushback : t -> writer -> unit Lwt.t
val read : reader -> t Lwt.t