分析器需要启用“不可为空”语言功能

问题描述

我通过迁移到空安全犯了一个错误然后每件事都变成了错误，在修复了很多错误后，我仍然得到一个错误，错误是：

[INFO] Generating build script...
[INFO] Generating build script completed,took 452ms

[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed,took 131ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed,took 791ms

[INFO] Running build...
[INFO] Running build completed,took 30ms

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed,took 79ms

[SEVERE] json_serializable:json_serializable on lib/injection.config.dart (cached):

This builder requires Dart inputs without Syntax errors.
However,package:invoice_app/injection.config.dart (or an existing part) contains the following errors.
injection.config.dart:18:48: This requires the 'non-nullable' language feature to be enabled.
injection.config.dart:18:12: This requires the 'non-nullable' language feature to be enabled.

Try fixing the errors and re-running the build.

[SEVERE] Failed after 123ms
pub finished with exit code 1

解决方法

看起来可注入生成器与新版本的 dart 有一些混淆，这就是为什么当我生成新的 injection.config.dart 文件时，它给出了这个错误

injection.config.dart:18:12：这需要启用“不可为空”语言功能。

因此，如果您想修复它，只需打开该文件，然后从该文件中删除 ? 标记

_i1.GetIt $initGetIt(_i1.GetIt get,{String? environment,_i2.EnvironmentFilter? environmentFilter}) {
  final gh = _i2.GetItHelper(get,environment,environmentFilter);
  return get;
}

到这里

_i1.GetIt $initGetIt(_i1.GetIt get,{String environment,_i2.EnvironmentFilter environmentFilter}) {
  final gh = _i2.GetItHelper(get,environmentFilter);
  return get;
}

我知道这不是一个解决方案，但它一直有效，直到我迁移到不可为空时，我才会使用它。

analyzer build-runner dart