def METHOD_NAME(self) -> ListOfCerts:
    common = self.get_common()
    # We have to explicitly cast this empty list to a list of strings.
    empty_cert_list: List[str] = []
    cert_list = common.setdefault("tls_certificates", empty_cert_list)
    # cert_list is of type EnvoyCommonTLSElements right now, so we need to cast it.
    return typecast(ListOfCerts, cert_list)