/**
 * Implements hook_node_access_records().
 */
function {{ machine_name }}_node_access_records(\Drupal\node\NodeInterface $node) {
  // We only care about the node if it has been marked private. If not, it is
  // treated just like any other node and we completely ignore it.
  if ($node->private->value) {
    $grants = [];
    // Only published Catalan translations of private nodes should be viewable
    // to all users. If we fail to check $node->isPublished(), all users would be able
    // to view an unpublished node.
    if ($node->isPublished()) {
      $grants[] = [
        'realm' => 'example',
        'gid' => 1,
        'grant_view' => 1,
        'grant_update' => 0,
        'grant_delete' => 0,
        'langcode' => 'ca',
      ];
    }
    // For the example_author array, the GID is equivalent to a UID, which
    // means there are many groups of just 1 user.
    // Note that an author can always view nodes they own, even if they have
    // status unpublished.
    if ($node->getOwnerId()) {
      $grants[] = [
        'realm' => 'example_author',
        'gid' => $node->getOwnerId(),
        'grant_view' => 1,
        'grant_update' => 1,
        'grant_delete' => 1,
        'langcode' => 'ca',
      ];
    }

    return $grants;
  }
}