3

I'd like to attach a library to a custom 404 page. I'd like to do this in my theme file. How can I know if the current response will be a 404 Page Not Found?

2

Got it.

In your hook within your theme file:

  $status = \Drupal::requestStack()->getCurrentRequest()->attributes->get('exception');
  if ($status && $status->getStatusCode() == 404) {
    $page['#attached']['library'][] = 'themename/notfound';
  }

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