确保来自接口/ PickDeep<>的子集接口？

interface PickDeep<T, K extends keyof T> {
  [P in K]: T[P] extends object ? PickDeep<T[P], keyof T[P]> : T[P];
}

function pickDeep<T, K extends keyof T>(obj: T, paths: K[]): PickDeep<T, K> {
  const result = {} as PickDeep<T, K>;
  for (const path of paths) {
    let value = obj;
    for (const key of path.split('.')) {
      value = value[key];
    }
    result[path] = value;
  }
  return result;
}

// 示例使用
const obj = {
  a: {
    b: {
      c: 1,
      d: 2,
    },
  },
  e: {
    f: {
      g: 3,
      h: 4,
    },
  },
};

const subset = pickDeep(obj, ['a.b.c', 'e.f.g']);
console.log(subset); // 输出 { a: { b: { c: 1 } }, e: { f: { g: 3 } } }