export function rollup<T extends Record<string, any>>(
  cb: (offset: number) => Promise<T[]>,
  limit: number,
) {
  const results: T[] = [];
  return new Promise<T[]>((resolve, reject) => {
    function next(offset = 0) {
      cb(offset)
        .then((res) => {
          results.push(...res);
          if (res.length < limit) {
            resolve(results);
          } else {
            next(offset + res.length);
          }
        })
        .catch(reject);
    }
    next(0);
  });
}