You can search for identifiers within the package.
in-package search v0.2.0
module Message : sig ... end
Basic JSON-RPC Incoming Messages
module VersionedTextDocument : sig ... end
val mk_notification : method_:string -> params:Yojson.Safe.t -> Yojson.Safe.t
Build notification
val mk_reply : id:int -> result:Yojson.Safe.t -> Yojson.Safe.t
Answer to a request
val mk_request_error : id:int -> code:int -> message:string -> Yojson.Safe.t
Fail a request