Reason · Reason lets you write simple, fast and quality type safe code while leveraging both the JavaScript & OCaml ecosystems.

sig
 type 'a key
 val new_key :
  ?split_from_parent:('a -> 'a) -> (unit -> 'a) -> 'a Domain.DLS.key
 val get : 'a Domain.DLS.key -> 'a
 val set : 'a Domain.DLS.key -> 'a -> unit
end