const parseDiagnosisCodes = (object: unknown): Array<Diagnosis['code']> =>  {
  if (!object || typeof object !== 'object' || !('diagnosisCodes' in object)) {
    // we will just trust the data to be in correct form
    return [] as Array<Diagnosis['code']>;
  }

  return object.diagnosisCodes as Array<Diagnosis['code']>;
};

const DiagnosisCodesSchema = z
  .array(z.string())
  .optional()
  .transform((codes) => (codes ? codes : []));