You can search for identifiers within the package.
in-package search v0.2.0
module Project : sig ... end
val merge_requests : ?token:Token.t -> ?state:Gitlab_t.state -> ?milestone:string -> ?labels:string list -> ?author:string -> ?author_username:string -> ?my_reaction:string -> ?scope:Gitlab_t.merge_request_scope -> id:string -> unit -> Gitlab_t.merge_request Stream.t
module Milestone : sig ... end