Flutter 空安全迁移卡在“未定义命名参数”错误

Question

我正在尝试按照 this guide 和 this video 将我的一个项目迁移到 null-safety，但我在升级我的依赖项和在 Web 界面中查看迁移建议之间陷入了困境。我设法将我的项目从 Flutter 1 升级到 Flutter 2，以将所有依赖项更新到它们的 null 安全版本，除了 build_runner 作为开发依赖项，但 apparently we can ignore that。现在，当我运行dart migrate 时，我在终端中得到了这样的结果：

Analyzing project...
[---------------------------------------------------------------------------------------------------------------------------------------------------------------\]
23 analysis issues found:
  error • The named parameter 'email' isn't defined at lib/screens/email_screen.dart:38:11 • (undefined_named_parameter)
  error • The named parameter 'password' isn't defined at lib/screens/email_screen.dart:39:11 • (undefined_named_parameter)
  error • The named parameter 'errorText' isn't defined at lib/screens/email_screen.dart:124:29 • (undefined_named_parameter)
  error • The named parameter 'errorText' isn't defined at lib/screens/email_screen.dart:128:29 • (undefined_named_parameter)
  error • The named parameter 'errorText' isn't defined at lib/screens/first_name_screen.dart:112:27 • (undefined_named_parameter)
  error • The named parameter 'data' isn't defined at lib/screens/onboarding_screen.dart:47:17 • (undefined_named_parameter)
  error • The named parameter 'styleSheet' isn't defined at lib/screens/onboarding_screen.dart:49:17 • (undefined_named_parameter)
  error • The named parameter 'onTapLink' isn't defined at lib/screens/onboarding_screen.dart:59:17 • (undefined_named_parameter)
  error • The named parameter 'verificationId' isn't defined at lib/screens/phone_code_screen.dart:77:9 • (undefined_named_parameter)
  error • The named parameter 'smsCode' isn't defined at lib/screens/phone_code_screen.dart:78:9 • (undefined_named_parameter)
  error • The named parameter 'phoneNumber' isn't defined at lib/screens/phone_code_screen.dart:149:7 • (undefined_named_parameter)
  error • The named parameter 'verificationCompleted' isn't defined at lib/screens/phone_code_screen.dart:150:7 • (undefined_named_parameter)
  error • The named parameter 'verificationFailed' isn't defined at lib/screens/phone_code_screen.dart:156:7 • (undefined_named_parameter)
  error • The named parameter 'codeSent' isn't defined at lib/screens/phone_code_screen.dart:159:7 • (undefined_named_parameter)
  error • The named parameter 'codeAutoRetrievalTimeout' isn't defined at lib/screens/phone_code_screen.dart:166:7 • (undefined_named_parameter)
  error • The named parameter 'forceResendingToken' isn't defined at lib/screens/phone_code_screen.dart:171:7 • (undefined_named_parameter)
  error • The named parameter 'errorText' isn't defined at lib/screens/phone_code_screen.dart:288:31 • (undefined_named_parameter)
  error • The named parameter 'errorText' isn't defined at lib/screens/phone_code_screen.dart:293:31 • (undefined_named_parameter)
  error • The named parameter 'phoneNumber' isn't defined at lib/screens/phone_number_screen.dart:49:9 • (undefined_named_parameter)
  error • The named parameter 'verificationCompleted' isn't defined at lib/screens/phone_number_screen.dart:50:9 • (undefined_named_parameter)
  error • The named parameter 'verificationFailed' isn't defined at lib/screens/phone_number_screen.dart:57:9 • (undefined_named_parameter)
  error • The named parameter 'codeSent' isn't defined at lib/screens/phone_number_screen.dart:92:9 • (undefined_named_parameter)
  error • The named parameter 'codeAutoRetrievalTimeout' isn't defined at lib/screens/phone_number_screen.dart:102:9 • (undefined_named_parameter)

Note: analysis errors will result in erroneous migration suggestions.

Please fix the analysis issues (or, force generation of migration suggestions by re-running with --ignore-errors).

现在，如果我以前两个错误为例，这里是它指向的代码行：

final emailCredential = EmailAuthProvider.credential(
          email: _emailAddress.trim(),
          password: randomPassword,
        );

从 Firebase Auth 调用这段代码：

/// Creates a new [EmailAuthCredential] from a given email and password.
  static AuthCredential credential({
    required String email,
    required String password,
  }) {
    return EmailAuthCredential._credential(email, password);
  }

如您所见，两个命名参数都定义得很好，所以我真的不明白问题出在哪里。我检查了所有其他错误，它们都是相同的：所有命名参数都存在并且实际上已定义。

我错过了什么？我可以安全地忽略这些错误并继续进行其余的迁移吗？

Answer 1

问题是由于安装了过时的 Dart，因为我没有使用随 Flutter 安装的 Dart。将 Dart 升级到最新版本后，问题解决了。