Firebase Auth Web Error. Error: The argument type 'Future<void> Function()' can't be assigned to the parameter type 'Future<void> Function(App)?'

First of all, this is the error that I encountered:

> /C:/Users/AppData/Local/Pub/Cache/hosted/pub.dev/firebase_auth_web-5.2.2/lib/firebase_auth_web.dart:92:45: Error: The argument type 'Future<void> Function()' can't be assigned to the parameter type 'Future<void> Function(App)?'.

• 'Future' is from 'dart:async'.
• 'App' is from 'package:firebase_core_web/src/interop/app.dart' ('/C:/Users/Grace%20Computer/AppData/Local/Pub/Cache/hosted/pub.dev/firebase_core_web-2.2.2/lib/src/interop/app.dart').
  app.dart:1
  FirebaseCoreWeb.registerService('auth', () async {
  ^

> Failed to compile application.

I am trying to run a flutter login application on web. I have pasted the required creditentials as <script> on the web>index.html file. The main.dart file looks like this:

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
      options: const FirebaseOptions(
          apiKey: "AIzaSyDZvxw2LXy05hLkcH_fpPWWa5RzwVlbQro",
          projectId: "messageapp-acf7a",
          messagingSenderId: "72207922701",
          appId: "1:72207922701:web:d84fe3144a7f2de5dd4744"
          ),
          );
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: SignupPage(),
    );
  }
}

The relevant parts of pubspec.yaml file is this:

name: frontend_msngr
description: A new Flutter project.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

version: 1.0.0+1

environment:
  sdk: '>=2.19.2 <3.0.0'


dependencies:
  flutter:
    sdk: flutter
  chat_bubbles: 
  firebase_core: 
  cupertino_icons: ^1.0.2
  firebase_auth: 
  firebase_auth_web:

dev_dependencies:
  flutter_test:
    sdk: flutter

  flutter_lints: ^2.0.0

flutter:

  uses-material-design: true```

Since,the file that got the error is lib/firebase_auth_web.dart , I don't know how I passed incorrect parameters (as suggested by the error).



I tried changing the versions a bitbut it didn't work for me. 

</details>


# 答案1
**得分**: 5

运行
flutter pub upgrade --major-versions

<details>
<summary>英文:</summary>

Run

flutter pub upgrade --major-versions

</details>



# 答案2
**得分**: 5

```yaml
dependencies:
  flutter:
    sdk: flutter
  firebase_auth: 4.3.0
  intl: 0.17.0

你需要将 firebase_auth 版本升级到最新版本（4.3.0，2023年3月）。为了与 firebase_auth 4.3.0 的依赖关系匹配，我不得不降级 intl 到版本 0.17.0。然后只需运行 flutter pub get。

flutter pub upgrade --major-versions 并没有为我升级这些包，它只是提醒我有一些包有新版本可用。

<details>
<summary>英文:</summary>

dependencies:
flutter:
sdk: flutter
firebase_auth: 4.3.0
intl: 0.17.0

You need to upgrade your version of `firebase_auth` to the last one (4.3.0 mars 2023) in your `pubspec.yaml`. I had to downgrade `intl` to the version `0.17.0` to fit with the dependence with `firebase_auth 4.3.0`.  And after just run `flutter pub get`.


`flutter pub upgrade --major-versions` didn't upgrade the packages for me but just notice me that there is new versions for some of my packages.

</details>



# 答案3
**得分**: 1

这是过去我曾使用过并且运行良好的代码示例：

```dart
Future<void> main() async {
  runApp(App());
}

class App extends StatelessWidget {
  // 在`build`之外创建初始化 Future：
  final Future<FirebaseApp> _initialization = Firebase.initializeApp();

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      // 初始化 FlutterFire：
      future: _initialization,
      builder: (context, snapshot) {
        // 检查错误
        if (snapshot.hasError) {
          return showAlertDialog(context, snapshot.error.toString());
        }

        // 当完成时，显示您的应用程序
        if (snapshot.connectionState == ConnectionState.done) {
          // 成功后调用方法
        }
        // 否则，在等待初始化完成时显示某些内容，例如加载屏幕
        return Loading();
      },
    );
  }
}

pubspec.yaml 文件的一部分：

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  
  firebase_auth: ^1.0.1

dev_dependencies:
  flutter_test:
    sdk: flutter

请注意，我已经删除了您原始文本中的 HTML 实体编码，以便更清晰地查看代码。

Future<void> main() async {
  runApp(App());
}

class App extends StatelessWidget {
  // Create the initilization Future outside of `build`:
  final Future<FirebaseApp> _initialization = Firebase.initializeApp();

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      // Initialize FlutterFire:
      future: _initialization,
      builder: (context, snapshot) {
        // Check for errors
        if (snapshot.hasError) {
          return showAlertDialog(context, snapshot.error.toString());
        }

        // Once complete, show your application
        if (snapshot.connectionState == ConnectionState.done) {
			//Call method once successful
        }
        // Otherwise, show something whilst waiting for initialization to complete. for example loading screen
        return Loading();
      },
    );
  }
}

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter


  
  firebase_auth: ^1.0.1
dev_dependencies:
  flutter_test:
    sdk: flutter