如何使用flutter web从Firebase手机身份验证中删除验证码验证？

dependencies:
  firebase_core: ^1.0.0
  firebase_auth: ^1.0.0

import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_auth/firebase_auth.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

void removePhoneVerification() async {
  // 获取Firebase用户对象
  User user = FirebaseAuth.instance.currentUser;

  if (user != null) {
    // 关联用户的手机号与Firebase身份验证
    PhoneAuthProvider phoneAuthProvider = PhoneAuthProvider();
    phoneAuthProvider.verifyPhoneNumber(
      phoneNumber: user.phoneNumber,
      verificationCompleted: (PhoneAuthCredential credential) async {
        // 验证已完成
        await user.updatePhoneNumber(credential);
      },
      verificationFailed: (FirebaseAuthException e) {
        // 验证失败
        print(e.message);
      },
      codeSent: (String verificationId, int resendToken) async {
        // 验证码已发送
        // 在这里进行验证码验证的删除操作
        await user.unlink(PhoneAuthProvider.phoneAuthCredential(verificationId: verificationId, smsCode: ''));
      },
      codeAutoRetrievalTimeout: (String verificationId) {},
    );
  }
}