code: function normalize(
    recordSource: MutableRecordSource,
    selector: NormalizationSelector,
    response: PayloadData,
    options: NormalizationOptions,
  ): NormalizedResponse {
    const {dataID, node, variables} = selector;
    const normalizer = new RelayResponseNormalizer(
      recordSource,
      variables,
      options,
    );
    return normalizer.normalizeResponse(node, dataID, response);
  }
docs: Normalizes the results of a query and standard GraphQL response, writing the
  normalized records/fields into the given MutableRecordSource.
  
  If handleStrippedNulls is true, will replace fields on the Selector that
  are not present in the response with null. Otherwise will leave fields unset.