https://api.drupal.org/api/drupal/core%21modules%21search%21src%21Form%21SearchBlockForm.php/property/SearchBlockForm%3A%3AsearchPageRepository/11.x
SearchBlockForm::$searchPageRepository | Drupal API
drupalapi
https://api.drupal.org/api/drupal/core%21modules%21search%21src%21Form%21SearchBlockForm.php/property/SearchBlockForm%3A%3Arenderer/11.x
SearchBlockForm::$renderer | Drupal API
rendererdrupalapi