Build failure when using @Freezed(genericArgumentFactories: true) with @JsonSerializable(explicitToJson: true)

[Peetee06]

Issue Description

When using @Freezed(genericArgumentFactories: true) together with @JsonSerializable(explicitToJson: true) on factory constructors, the build runner fails with an error indicating that genericArgumentFactories needs to be set, even though it's already specified on the @Freezed annotation.

Minimal Reproducible Example

I've created a minimal reproducible example repository demonstrating this issue:
https://github.com/Peetee06/freezed-generic-issue

Expected Behavior

The build runner should recognize that genericArgumentFactories: true is set on the @Freezed annotation and generate the necessary code without errors.

Actual Behavior

The build runner fails with the following error:

E json_serializable on lib/api_response.dart:
  Could not generate `fromJson` code for `data` because of type `T` (type parameter).
  To support type parameters (generic types) you can:
  * Use `JsonConverter`
  * Use `JsonKey` fields `fromJson` and `toJson`
  * Set `JsonSerializable.genericArgumentFactories` to `true`
  package:freezed_generic_issue/api_response.freezed.dart:78:11
     ╷
  78 │  final  T data;
     │           ^^^^
     ╵

Code Example

@Freezed(genericArgumentFactories: true)
abstract class ApiResponse<T> with _$ApiResponse<T> {
  @JsonSerializable(explicitToJson: true)
  const factory ApiResponse.data(T data) = ApiResponseData;

  @JsonSerializable(explicitToJson: true)
  const factory ApiResponse.error(String message) = ApiResponseError;

  factory ApiResponse.fromJson(
    Map<String, dynamic> json,
    T Function(Object?) fromJsonT,
  ) =>
      _$ApiResponseFromJson(json, fromJsonT);
}

Workaround

Setting genericArgumentFactories: true on the @JsonSerializable annotations as well resolves the issue:

@JsonSerializable(explicitToJson: true, genericArgumentFactories: true)

See lib/api_response_working.dart in the repository for the working example.

Versions

• freezed_annotation: ^3.1.0
• freezed: ^3.2.0
• json_annotation: ^4.9.0
• json_serializable: ^6.7.1
• build_runner: ^2.10.3
• Dart SDK: ^3.10.0

Reproduction Steps

1. Clone the repository: https://github.com/Peetee06/freezed-generic-issue
2. Run dart pub get
3. Run dart run build_runner build --delete-conflicting-outputs
4. Observe the build failure