Hardhat multi-dir compile

[0xaaaaaron]

I got following error when running hardhat compile --force
Types containing (nested) mappings can only be parameters or return variables of internal or library functions.

I'm not debugging deep into this because the error comes from the method I'm not using (which can be deleted from sol file),
and the method I'd like to test is not in contract-exposed sol (not sure why)

I found it could be much simpler if I provide the test sol wrapper to open visibility of the method I'd like to test, instead of having an automated tool.
But hardhat does not support multi-dir compile, this seems to be a popular feature request.
Can you consider making some changes in hardhat-exposed to support compile the sol I provide?

[frangio]

Please share the Solidity code so I can debug.