'json_serializable enhanced enums not working. This requires the 'enhanced-enums' language feature to be enabled

I'm using the latest version of all these packages.

dependencies
  json_annotation: ^4.5.0

dev_dependencies:
  json_serializable: ^6.2.0
  build_runner: ^2.1.10

I also found that json_serializable: 6.1.5 added support for enhanced enums. But when I run flutter pub build_runner build on

@JsonEnum(fieldRename: FieldRename.snake)
enum Foo {
  helloWorld,
  bar;
}

I get this error:

This builder requires Dart inputs without syntax errors. However, package:example/main.dart (or an existing part) contains the > following errors. main.dart:15:8: This requires the 'enhanced-enums' language feature to be enabled.

I also noticed that all these packages's pubspec.yaml are still not using the Dart SDK 2.17.0. I manually changed them to 2.17.0.

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Solution	Source

'json_serializable enhanced enums not working. This requires the 'enhanced-enums' language feature to be enabled

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