ERR_HTTP_HEADERS_SENT：无法设置 cookie

如何解决ERR_HTTP_HEADERS_SENT：无法设置 cookie

这是我的代码

import { Request,Response } from "express";
import { database } from "firebase-admin";

async function updatereAccesstoken(
  req: Request,res: Response,db: database.Database
) {
  try {

    await db
      .ref(
        `/token/${"-MUQK0wGmrjPVBdFH7gr"}/${"90417abf-b085-4072-b4ec-f009b5fe4016"}`
      )
      .set("90417abf-b085-4072-b4ec-f009b5fe4016");

    
    await db
      .ref(
        `/token/${"-MUQK0wGmrjPVBdFH7gr"}/${"90417abf-b085-4072-b4ec-f009b5fe4016"}`
      )
      .set("90417abf-b085-4072-b4ec-f009b5fe4016");

//comments

    res.cookie("act","tokenAuth.accesstoken",{
      httpOnly: true,sameSite: "lax",});

    res.cookie("ret","tokenAuth.refreshToken",});

    return "currentUser";
  } catch (error) {}
}

代码在评论前有效。然后我得到错误

[ERR_HTTP_HEADERS_SENT]：发送到客户端后无法设置标头 在 ServerResponse.setHeader (_http_outgoing.js:558:11)

将代码分成两部分

1

    await db
      .ref(
        `/token/${"-MUQK0wGmrjPVBdFH7gr"}/${"90417abf-b085-4072-b4ec-f009b5fe4016"}`
      )
      .set("90417abf-b085-4072-b4ec-f009b5fe4016");

    
    await db
      .ref(
        `/token/${"-MUQK0wGmrjPVBdFH7gr"}/${"90417abf-b085-4072-b4ec-f009b5fe4016"}`
      )
      .set("90417abf-b085-4072-b4ec-f009b5fe4016");

2

res.cookie("act",{
          httpOnly: true,});
    
        res.cookie("ret",});

代码的这两部分单独工作，但不是一起工作。什么原因？。