You can search for identifiers within the package.
in-package search v0.2.0
module Reader : Resp.READER with type ic = Lwt_io.input_channel
module Writer : Resp.WRITER with type oc = Lwt_io.output_channel
module Backend (Data : sig ... end) : Resp_server.SERVER with type oc = Lwt_io.output_channel and type ic = Lwt_io.input_channel and type data = Data.data
module Server : sig ... end
module Client : Resp_client.S with type params = Conduit_lwt_unix.ctx * Conduit_lwt_unix.client and type t = Reader.ic * Writer.oc