Available on cs
@:op(A + B)staticinlineAdd(arg1:AsyncCallback, arg2:AsyncCallback):AsyncCallback
@:has_untyped@:fromstaticinlineFromHaxeFunction(hxfunc:IAsyncResult ‑> Void):AsyncCallback
@:op(A - B)staticinlineRemove(arg1:AsyncCallback, arg2:AsyncCallback):AsyncCallback
@:implinlineAsDelegate():Delegate_AsyncCallback