As an alternative, we can extend CodeGeneratorOption.

How would that look like?

We can add a new option:

object CodeGenerationOptions {
  ...
  case object Fs2GrpcDisableTrailers extends CodeGeneratorOption {
    override def toString: String = "fs2_grpc:disable_trailers"
  }
}

Here is a complete example: iRevive#1

I see. Not sure if that is preferable. Then we have two ways of customizing fs2grpc things, one for the serviceSuffix and one for fs2_grpc:disable_trailers, right?

Yes. If we want to follow the new code-generation option path, we should deprecate fs2GrpcServiceSuffix and replace it with CodeGeneratorOption.Fs2GrpcServiceSuffix(suffix: String).

But I'm not sure it's worth it.

If CodeGeneratorOption is the recommendation then I think it is worth it. Now is the time to do breaking changes.

Great, let's move to CodeGeneratorOption then.

I will move fs2GrpcServiceSuffix to the CodeGeneratorOption in the follow-up PR. Let's deprecate the fs2GrpcServiceSuffix plugin key and keep it around for a while so that users can migrate.