https://api.drupal.org/api/drupal/core%21modules%21language%21src%21Form%21NegotiationConfigureForm.php/property/NegotiationConfigureForm%3A%3AblockStorage/11.x
NegotiationConfigureForm::$blockStorage | Drupal API
drupalapi
https://api.drupal.org/api/drupal/core%21modules%21language%21src%21Form%21NegotiationConfigureForm.php/property/NegotiationConfigureForm%3A%3AlanguageManager/10
NegotiationConfigureForm::$languageManager | Drupal API
drupalapi