Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / vendor / chi-teck / drupal-code-generator / templates / d7 / hook / aggregator_parse.twig

/**
 * Implements hook_aggregator_parse().
 */
function {{ machine_name }}_aggregator_parse($feed) {
  if ($items = mymodule_parse($feed->source_string)) {
    $feed->items = $items;
    return TRUE;
  }
  return FALSE;
}