目前对颤动使用非空,除了cached_network_image之外,所有的依赖项都可以正常工作。: Nullsafe libraries are not allowed to export declarations from of opt-out libraries.
export 'package:1: Error: Nullsafe libraries are not allowed to export declarations from of opt-out lib
Dart文档()说dart是一种静态类型的语言-Yes, Dart 2 is statically typed.For more information, read about Dart’s type system.Even with type-safeDart, you can annotate any variable with dynamic if you need the fle