【flutter报错解决】the following dependencies don't support null safety

使用flutter run后，报如下错误：

Error: Cannot run with sound null safety, 
because the following dependencies don't support null safety:

 - package:cloud_firestore_web
 - package:firebase_core_web
 - package:shared_preferences
 - package:url_launcher_web
 - package:firebase_auth
 - package:http
 - package:provider
...

For solutions, see https://dart.dev/go/unsound-null-safety
Failed to compile application.

第一种方法

在终端运行

flutter run --no-sound-null-safety

第二种方法

IntelliJ/Android Studio

"Edit Configurations" (在RUN配置里) → "Additional run args" 添加

--no-sound-null-safety

VS Code

在用户设置里查找"Flutter run additional args"并添加

--no-sound-null-safety

参考Stackoverflow解决方案