Spurious errors from extra-project Haskell files.

I have some Haskell files in my project directory outside of the traditional `./src/`, `./app/` and `./test/` directories. Examples are `./dev-tools.hs` where I keep some things I like to use in GHCi, and `./.cache/hie-bios/.../Paths_mwb.hs`.

Haskell plugin reports errors in these files and tries to set up a multi-cradle project, but I would prefer if it didn't since they are not part of my actual project source.

Is there a way to tell the plugin to only trigger for Haskell files in specific directories?