class
 ToolkitAssets
            instance:ToolkitAssets        
                            options:        
                            preloadList:Array<>        
                            addPlugin(plugin:AssetPlugin):Void        
                            cacheImage(resourceId:String, imageInfo:):Void        
                            getBytes(resourceId:String):Bytes        
                            getCachedImage(resourceId:String):        
                            getFont(resourceId:String, callback::->Void, useCache:Bool = true):Void        
                            getImage(resourceId:String, callback::->Void, useCache:Bool = true):Void        
                            getText(resourceId:String):String        
                    