normalizeOmissionsLinks example

    ]);
    if ($data instanceof ErrorCollection) {
      $document['errors'] = $this->normalizeErrorDocument($object, $format, $context);
    }
    else {
      // Add data.       $document['data'] = $this->serializer->normalize($data, $format, $context);
      // Add includes.       $document['included'] = $this->serializer->normalize($object->getIncludes(), $format, $context)->omitIfEmpty();
      // Add omissions and metadata.       $normalized_omissions = $this->normalizeOmissionsLinks($object->getOmissions(), $format, $context);
      $meta = !$normalized_omissions instanceof CacheableOmission
        ? array_merge($object->getMeta(), ['omitted' => $normalized_omissions->getNormalization()])
        : $object->getMeta();
      $document['meta'] = (new CacheableNormalization($normalized_omissions, $meta))->omitIfEmpty();
    }
    // Add document links.     $document['links'] = $this->serializer->normalize($object->getLinks(), $format, $context)->omitIfEmpty();
    // Every JSON:API document contains absolute URLs.     return CacheableNormalization::aggregate($document)->withCacheableDependency((new CacheableMetadata())->addCacheContexts(['url.site']));
  }