While trying to create a fork of Js.ml (and all submodules) I found out that the structure included in this repo isn't doable in dune (for my knowledge).

The problem are circular-dependencies:

(* js.ml *)
type 'a t = < .. > as 'a

type +'a null

module Null = Js_null
(** Provide utilities around ['a null] *)

(* js_null.ml *)
type +'a t = 'a Js.null

(* .. *)
Js.whatever

This isn't a problem per-se, but if we want to reach the point of cross-compilation for Js and Belt, it would be nice to solve.