new (?display:Sprite)
read onlycomplete:Bool
onComplete:Event<Void ‑> Void> = new Event<Void>()
onProgress:Event<Int ‑> Int ‑> Void> = new Event<Int -> Int>()
addLibrary (library:AssetLibrary):Void
addLibraryName (name:String):Void
create (config:Config):Void
load ():Void