Below is the API for the OCaml standard library. It's directly copied over from the OCaml Manual, formatted to the Reason syntax and styled accordingly. The API docs are work-in-progress; we'll be polishing these gradually!
If you're targeting JavaScript, the API docs for BuckleScript includes all of below, plus JS-specific APIs.
module Map: sig .. end
module type OrderedType = Map.OrderedType
module type S = sig .. end
module Make: functor (Ord : OrderedType) -> S with type key = Ord.t