You can search for identifiers within the package.
in-package search v0.2.0
type 'a s = 'a Event_stream.EventStream.Make(Stream_lwt.Stream).Sink.s
val of_stream : 'a t -> 'a s
val push : 'a -> 'a s -> unit Lwt.t
val count : 'a s -> int
val close : 'a s -> unit
val closed : 'a s -> bool
val blocked : 'a s -> bool