MsgPack003 errors showing in Rider for type with custom formatter about messagepack-csharp

[tylorr]

It appears that I need to specify Unity.Entities.Hash128 within a MessagePackAnalyzer.json and pass that to the analyzer via a AdditionalFiles property. But I can't find a way to do that in Unity where both unity and the editor can see it. I've only been able to get the IDE to see it but there are times (though curiously not all the time) where Unity will complain with the same error and I have not found a way to provide Unity with the right AdditionalFiles setting.

I currently don't care to have the analyzers as long as I could use the source generator with accurate error logging. I've tried removing the analyzers but then Unity complains that MessagePack.GeneratedMessagePackResolver is internal and can't access it which makes sense. But I can't figure out how to pass any of the customizations to the generator via Unity such as MessagePackGeneratedResolverNamespace or PublicMessagePackGeneratedResolver.

I'm working with several in house built unity packages which I would love to use source generators for as well but currently it just doesn't seem possible. I would love another way of configuring the source generation that doesn't involve modifying csproj files because it doesn't work with Unity.

[AArnott]

You mention Rider a lot. Does it repro without Rider (e.g. command line, Visual Studio, or the Unity editor)?