type t

(** Create the elements to be declared inside the panel *)
val build
  : Prosemirror.t -> t

(** Get the events triggered by the actions buttons *)
val get_event
  : t -> Editor_app.event Note.event

(** Finalize the creation, register the handler to state update, and return the
    dom elements. 

    Raise an error if already completed. *)
val complete
  : t -> State.t Note.signal -> Brr.El.t list