Issue #3323361 by Anybody, geek-merlin, Grevil: PHPDoc: Undefined method...

function asset_injector_page_attachments(array &$attachments) {

  /** @var \Drupal\Core\Render\RendererInterface $renderer */

  $renderer = \Drupal::service('renderer');

  /** @var \Drupal\Core\Asset\AttachedAssetsInterface $asset */

  /** @var \Drupal\asset_injector\AssetInjectorInterface $asset */

  foreach (asset_injector_get_assets(TRUE) as $asset) {

    $attachments['#attached']['library'][] = 'asset_injector/' . $asset->libraryNameSuffix();

    $renderer->addCacheableDependency($attachments, $asset);