Node importNode(Node node, [bool deep])

Source 

Node importNode(Node node, [bool deep]) {
  if (deep != null) {
    return wrap_jso(_blink.BlinkDocument.instance.importNode_Callback_2_(unwrap_jso(this), unwrap_jso(node), deep));
  }
  return wrap_jso(_blink.BlinkDocument.instance.importNode_Callback_1_(unwrap_jso(this), unwrap_jso(node)));
}