如何在树状结构上执行多个嵌套的Lodash GroupBys？

<script src="https://cdn.jsdelivr.net/lodash/4.17.15/lodash.min.js"></script>

npm install lodash

const tree = [
  {
    value: 'A',
    children: [
      {
        value: 'B',
        children: [
          {
            value: 'C',
            children: []
          },
          {
            value: 'D',
            children: []
          }
        ]
      },
      {
        value: 'E',
        children: [
          {
            value: 'F',
            children: []
          },
          {
            value: 'G',
            children: []
          }
        ]
      }
    ]
  }
];

const groupByTree = (tree, iteratee) => {
  return _.groupBy(tree, iteratee).map((group) => {
    const value = group[0][iteratee];
    const children = groupByTree(_.flatMap(group, 'children'), iteratee);
    return { value, children };
  });
};

const result = groupByTree(tree, 'value');
console.log(result);