flutter - 生成器无法定位尚未迁移到空安全的库
问题描述
尝试以下命令时会出现此问题:
flutter pub run build_runner build --delete-conflicting-outputs
错误信息:
[SEVERE] json_serializable:json_serializable on lib/models/shipping_address/shipping_address.dart:
Generator cannot target libraries that have not been migrated to null-safety.
package:deals_and_delivery/models/shipping_address/shipping_address.dart:6:7
╷
6 │ class ShippingAddress {
│ ^^^^^^^^^^^^^^^
╵
[INFO] Running build completed, took 3.6s
[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 49ms
[SEVERE] Failed after 3.7s
pub finished with exit code 1
pubspec.yaml:
dependencies:
json_annotation: ^4.0.0
flutter:
sdk: flutter
...
dev_dependencies:
build_runner: ^1.11.5
json_serializable: ^4.0.2
flutter_test:
sdk: flutter
这些是当前的颤振和飞镖版本:
[√] Flutter (Channel stable, 2.0.0, on Microsoft Windows [Version
> 10.0.19042.844], locale en-US)
> • Flutter version 2.0.0 at C:\flutter
> • Framework revision 60bd88df91 (22 hours ago), 2021-03-03 09:13:17 -0800
> • Engine revision 40441def69
> • Dart version 2.12.0
我卡在这一点上,如何解决这个问题。
解决方案
我发现这json_serializable >=4.0.0
取决于json_annotation >=4.0.0 <4.1.0
并且json_annotation: ^4.0.0
包含Null Safety
但json_serializable: ^4.0.2
不包含,因此正在发生错误。
所以我降级了两个包:
json_annotation: 3.1.1
和
json_serializable: 3.5.1
他们再次正常工作。
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