Nesting/Sharing State across Modules

[wtsnz]

I've been enjoying using the Swift Composable Architecture over the last year. It comes with a promising sell and it mostly pulls it off. Thing is, I'm having a little trouble sharing state across my apps and am not sure the best way forward.

I've created a little example project and am wondering the best way to go about implementing the minimum amount of code to get it working.

With this example project I hope to demonstrate a problem that keeps popping up in projects I've used TCA with, along with a couple of potential solutions. It doesn't take much complexity for the nesting state issue to show up. Making an app that navigates between different modules via a push, or presentation sheet is enough to start facing this issue.

I've added and described three possible solutions to this problem, but they all have different downsides. I'm hoping that I'm missing something simple, and that one of you have a better solution that I! 😀

Please check out a more detailed brief of the problem in the repo, any ideas are appreciated.
https://github.com/wtsnz/swift-composable-architecture-nesting