Generics complicate self-referential class structure

[craiglabenz]

The following code structure builds correctly, but lacks ideal usage of generics.

class Base<T> {
  const Base();
}

// Ideally, this would be `BaseConverter<T>` and `Base<T>`, but doing so breaks the build
class BaseConverter extends JsonConverter<Base, Json> {
  const BaseConverter();

  // Assume working implementations here :)
  @override
  Json toJson(Base obj) => throw UnimplementedError();
  @override
  Base fromJson(Json json) => throw UnimplementedError();
}

@Freezed(genericArgumentFactories: true)
class Data<T> extends Base<T> with _$Data<T> {
  const Data._();

  // Ideally, this would be `@BaseConverter<T>()` and `Base<T>`, but doing so breaks the build
  const factory Data(@BaseConverter() Base child) = _Data;

  factory Data.fromJson(Json json, T Function(Object?) fromJsonT) =>
      _$DataFromJson(json, fromJsonT);
}

[rrousselGit]

Hello Craig!

This is a json_serializable issue, not a Freezed one. Using a plain class leads to the same error. I'd suggest opening an issue on json_serializable and asking Kevin about it :)

[craiglabenz]

Thanks for the context, @rrousselGit :)