howt to recursive to get uncountable stacked object

javascript recursive get object in object

const extractor = (initialData, data) => {
    if (data.item_group && data.item_group.length > 0) {
      const children = data.item_group.reduce((a, b) => {
        return [...a, ...extractor([], b)];
      }, []);
      const temp = { ...data };
      temp.count_child = children.length;
      delete data.item_group;
      return [...initialData, temp, ...children];
    }
    delete data.item_group;
    data.count_child = 1;
    return [...initialData, data];

    // how to use
    // setstate(tmp.list.reduce((a, b) => [...a, ...extractor([], b)], []));
  };