原数据：

const list = [
{id:1, key: 'a'},
{id:1, key: 'b'},
{id:2, key: 'c'},
{id:2, key: 'd'},
]

期望数据格式

const newList = [
{id:1, keyList: ['a','b']},
{id:2, keyList: ['c','d']},
]

// 相同id的数据合并
    let newList=
      _(list )
        .flatten()
        .groupBy('id')
        .map(
          _.spread((...values) => {
            console.log(values, 'values');
            let keyList: string[] = [];
            let newId = '';
            values?.forEach((item: any, index: number) => {
              if (index === 0) {
                newId = item?.id;
              }
              keyList.push(item?.key);
            });
            return { id: newId , keyList};
          }),
        )
        .value() || [];
    console.log(newList, 'newList');

页面输出：