从生成器迁移到async / await

Question

我遇到了从生成器迁移到async / await两个函数以下的问题。 当我等待send（）中的endPoints时，我将来自fixedPublisher（）的promise返回值视为未定义。 我错过了下面的任何内容吗？

发电机

export function* fixedPublisher(endpoints: any): any {
  while (endpoints !== undefined) {
    yield co(function* send(): any {
      return endpoints;
    });
  }
}

function* send(publisher: any, rnd: any): any {
  const p = publisher.next();
  if (p.done) {
    throw new Error('publisher is done');
  }
  const endpoints = yield p.value;
  if (!endpoints || endpoints.length === 0) {
    throw new Error('publisher did not return endpoints');
  }
  const m = Math.max(endpoints.length - 1, 0);

  return endpoints[rnd.integer(0, m)];
}

Async / Await

export async function fixedPublisher(endpoints: any): Promise<any> {
    return await co(endpoints);
}

function* send(publisher: any, rnd: any): any {
  const endpoints =  await (publisher);
  if (!endpoints || endpoints.length === 0) {
    throw new Error('publisher did not return endpoints');
  }
  const m = Math.max(endpoints.length - 1, 0);
  return endpoints[rnd.integer(0, m)];
}