Type Errors when importing AppRouter from npm workspace TRPC server

I'm setting up a mono repo using npm workspaces where I have an api directory which has a trpc directory. When I import the AppRouter from my package, I get cryptic type error I can not understand, BUT when I copy the files directly into my next project, the type error goes away. So I think I'm exporting the correct AppRouter, but typescript is confused for some reason. Any ideas what might be going on?