Available on js
new(?iterable:Any)
read onlysize:Int
add(value:T):Set<T>
clear():Void
delete(value:T):Bool
entries():JsIterator<MapEntry<T, T>>
forEach(callback:(value:T, key:T, set:Set<T>) ‑> Void, ?thisArg:Any):Void
has(value:T):Bool
keys():JsIterator<T>
values():JsIterator<T>