云函数 "await" 对此表达式的类型没有影响？

exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext();
  const app = new TcbRouter({ event });


  app.use(async (ctx, next) => {
    ctx.data = {};
    await next();
  });
  
  app.router('MyContributeManage', async (ctx, next) => {
    const result = await db.collection('Guardian')
      .aggregate()
      .match({
        userId: wxContext.UNIONID,
      }).end();
      ctx.body = { data: (result.list.length > 0) ? result.list[0] : {} }
  });
  
  return app.serve();
}