You can search for identifiers within the package.
in-package search v0.2.0
module Event : sig ... end
module Command : sig ... end
module App : sig ... end
val app : initial_model:(unit -> 'a) -> init:('a -> Command.t) -> update:(Event.t -> 'a -> 'a * Command.t) -> view:('a -> string) -> unit -> 'a App.t
val start : 'a App.t -> unit