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 CamlinternalLazy: sig .. end
exception Undefined
val force_lazy_block : 'a lazy_t -> 'a
val force_val_lazy_block : 'a lazy_t -> 'a
val force : 'a lazy_t -> 'a
val force_val : 'a lazy_t -> 'a