How to use the @opentelemetry/types.CanonicalCode.UNIMPLEMENTED function in @opentelemetry/types

} else {
    switch (statusCode) {
      case 400:
        return { code: CanonicalCode.INVALID_ARGUMENT };
      case 504:
        return { code: CanonicalCode.DEADLINE_EXCEEDED };
      case 404:
        return { code: CanonicalCode.NOT_FOUND };
      case 403:
        return { code: CanonicalCode.PERMISSION_DENIED };
      case 401:
        return { code: CanonicalCode.UNAUTHENTICATED };
      case 429:
        return { code: CanonicalCode.RESOURCE_EXHAUSTED };
      case 501:
        return { code: CanonicalCode.UNIMPLEMENTED };
      case 503:
        return { code: CanonicalCode.UNAVAILABLE };
      default:
        return { code: CanonicalCode.UNKNOWN };
    }
  }
};