1. DomName('DataTransferItemList.addData')
  2. DocsEditable()
DataTransferItem addData(String data, String type)

Source 

@DomName('DataTransferItemList.addData')
@DocsEditable()
DataTransferItem addData(String data, String type) => wrap_jso(_blink.BlinkDataTransferItemList.instance.add_Callback_2_(unwrap_jso(this), data, type));