我的应用支持多个身份提供程序（谷歌、Facebook、电子邮件）因此，通过订阅来自onAuthStateChanged的回调，可以更容易地触发登录流。我尝试确定这是否是用户第一次登录。此数据似乎可以通过函数getAdditionalUserInfo(userCredential: UserCredential)获得。否则，我需要从几个不同的代码路径触发此登录流，它将与主登录流异步。

export const watchAuthChanges = (onLoginSuccess, onLogoutSuccess, onError) => {
  onAuthStateChanged(auth, async (user) => {
    if (user) {
      const token = await getIdToken(user);
      const refreshToken = async () => {
        return await getIdToken(user, true);
      }

      const additionalInfo = getAdditionalUserInfo(???)
      // I want to pass in the additional user info into onLoginSuccess
      onLoginSuccess(user, token, refreshToken);
    } else {
      onLogoutSuccess();
    }
  }, (error) => {
    onError(error)
  });
}