getMergedMeta example

  public function __construct($data, IncludedData $includes, LinkCollection $links, array $meta = []) {
    assert($data instanceof TopLevelDataInterface || $data instanceof ErrorCollection);
    assert(!$data instanceof ErrorCollection || $includes instanceof NullIncludedData);
    $this->data = $data instanceof TopLevelDataInterface ? $data->getData() : $data;
    $this->includes = $includes->getData();
    $this->links = $data instanceof TopLevelDataInterface ? $data->getMergedLinks($links->withContext($this)) : $links->withContext($this);
    $this->meta = $data instanceof TopLevelDataInterface ? $data->getMergedMeta($meta) : $meta;
    $this->omissions = $data instanceof TopLevelDataInterface
      ? OmittedData::merge($data->getOmissions(), $includes->getOmissions())
      : $includes->getOmissions();
  }

  /** * Gets the data. * * @return \Drupal\jsonapi\JsonApiResource\Data|\Drupal\jsonapi\JsonApiResource\ErrorCollection * The data. */