open! Js_of_ocaml
open! Hello

(* https://stackoverflow.com/questions/34929382/what-are-the-differences-between-lwt-async-and-lwt-main-run-on-ocaml-node-js *)
let rec run t =
  let next_tick (_callback : unit -> unit) =
    Js.Unsafe.(fun_call
                 (js_expr "process.nextTick")
                 [| inject (Js.wrap_callback _callback) |])
  in Lwt.wakeup_paused ();
     match Lwt.poll t with
     | Some x -> x
     | None ->
        if Lwt.paused_count () > 0
        then next_tick (fun () -> run t)
        else ()

let () =
  run @@ Hello.main