如何在Flutter中将firebase匿名用户迁移到认证用户

import 'package:firebase_auth/firebase_auth.dart';

final FirebaseAuth _auth = FirebaseAuth.instance;

Future<UserCredential> signInAnonymously() async {
  UserCredential userCredential = await _auth.signInAnonymously();
  return userCredential;
}

import 'package:firebase_auth/firebase_auth.dart';

final FirebaseAuth _auth = FirebaseAuth.instance;

Future<void> linkAnonymousUserWithCredential(String email, String password) async {
  AuthCredential credential = EmailAuthProvider.credential(email: email, password: password);
  User user = _auth.currentUser;

  try {
    await user.linkWithCredential(credential);
    print('匿名用户已成功链接到认证用户');
  } catch (e) {
    print('链接失败：$e');
  }
}