def METHOD_NAME(directory: bytes) -> VerificationMethod:
    files = os.listdir(directory)
    if "main.vy" in files:
        return VerificationMethod.VYPER_SINGLE
    elif "contract.json" in files:
        return VerificationMethod.SOLIDITY_STANDARD
    elif len(files) > 2:
        return VerificationMethod.SOLIDITY_MULTIPLE
    else:
        return VerificationMethod.SOLIDITY_SINGLE