Sapper$会话更改在页面重新加载之前不会反映

在我的导航中。我拥有的苗条组件:

{#if $session.token}
  ${JSON.stringify($session.token)} - ${JSON.stringify($session.token.username)}
{/if}

在登录中。苗条:

const { session } = stores();
  let username, password;
  async function onLogin(username, password){
    const response = await fetch(`auth/login`, {
            method:"POST",
            headers:{ 'Content-Type': 'application/json' },
            body: JSON.stringify({"username":username,"password":password})
    })
    if (response.ok) {
      const json = await response.json();
      session.set({ token: json });
      $session.token = json;
      goto("/");
        } else {
            throw new Error(response);
        }
  }

登录名。js处理程序:

 req.session.token = user; //parsed.token;
        console.log(`req.session.token: ${JSON.stringify(req.session.token)}`);
        res.writeHead(200, {
          'Content-Type': 'application/json'
        });
        res.end(JSON.stringify({ token: user }));

服务器js公司:

sapper.middleware({
      session: (req, res) => {
        console.log(`% req.session.token: ${JSON.stringify(req.session.token)}`);
        return ({
          token: req.session.token
        })}
      })

以nav为单位的输出。苗条是: ${"token":{"_id":"kjbLgeU8k3GPr6jBd8NkCj","username":"matt123","password":"$2b$10$aXMJc64o9W166OL12CG/A.lWyuB9zdPkaNUsze3Lch6Z2khHaTKY.","access":"user"}} - $undefined

请注意,数据存在,但用户名输出未定义。我相信我做错了什么,但这并不清楚。 在sapper项目的跟踪器中添加了一个问题:

https://github.com/sveltejs/sapper/issues/1711