1. DomName('SVGTransformList.insertItemBefore')
  2. DocsEditable()
Transform insertItemBefore(Transform newItem, int index)

Source 

@DomName('SVGTransformList.insertItemBefore')
@DocsEditable()
Transform insertItemBefore(Transform newItem, int index) => _blink.BlinkSVGTransformList.instance.insertItemBefore_Callback_2_(this, newItem, index);