可以在Javascript中同步检查Firebase 3身份验证状态吗？

function checkAuthStatus() {
  return new Promise((resolve, reject) => {
    const unsubscribe = firebase.auth().onAuthStateChanged(user => {
      unsubscribe();
      resolve(user);
    }, error => {
      unsubscribe();
      reject(error);
    });
  });
}

async function main() {
  try {
    const user = await checkAuthStatus();
    if (user) {
      console.log("用户已登录");
    } else {
      console.log("用户未登录");
    }
  } catch (error) {
    console.error("检查身份验证状态时出错：", error);
  }
}

main();