class type label = object ... end
val coerce_annotation : baseAnnotation Js_of_ocaml.Js.t -> baseAnnotation Js_of_ocaml.Js.t
val empty_label : unit -> label Js_of_ocaml.Js.t
val empty_box_annotation : unit -> ('a, 'b) boxAnnotation Js_of_ocaml.Js.t
val empty_line_annotation : unit -> 'a lineAnnotation Js_of_ocaml.Js.t
val empty_annotation_config : unit -> annotation Js_of_ocaml.Js.t
val of_chart_options : Chartjs.#chartOptions Js_of_ocaml.Js.t -> annotation Js_of_ocaml.Js.t Js_of_ocaml.Js.optdef
val set_to_chart_options : Chartjs.#chartOptions Js_of_ocaml.Js.t -> annotation Js_of_ocaml.Js.t -> unit