我正在尝试将我的 Flutter 项目升级到 Flutter2。我看到我所有的包都是 null 安全的,但是 bulid_runner
。
$ flutter pub outdated --mode=null-safety
Showing dependencies that are currently not opted in to null-safety.
[✗] indicates versions without null safety support.
[✓] indicates versions opting in to null safety.
Package Name Current Upgradable Resolvable Latest
direct dependencies: all support null safety.
dev_dependencies:
build_runner ✗1.12.2 - ✗1.12.2 ✗1.12.2
No resolution was found. Try running `flutter pub upgrade --null-safety --dry-run` to explore why.
1 dependency is constrained to a version that is older than a resolvable version.
我的问题是,如果不支持如此重要的软件包,我该如何升级到 Flutter2。我该如何解决这个问题?有人见过这个问题吗?
最佳答案
遇到了同样的问题。实际上,如migration guide说,在迁移项目之前,您应该等待所有依赖项都迁移到 null safety。
但是。如果您没有在代码的任何地方引用 build_runner
包并将其用作命令行工具集,您可以忽略它还不是 null 安全的事实。只需使用引用指南继续迁移即可。
我需要将此包用于新版本的 mickito
以生成测试模拟。尽管它不是 null 安全的,但我成功地将它用于 Dart >=2.12 和 Flutter >=2.0。
关于Flutter2 升级 : Why build_runner package is not null-safe,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/67015532/