https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Messenger%21MessengerTrait.php/property/MessengerTrait%3A%3Amessenger/10
MessengerTrait::$messenger | Drupal API
messengerdrupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Messenger%21MessengerTrait.php/property/MessengerTrait%3A%3Amessenger/11.x
MessengerTrait::$messenger | Drupal API
messengerdrupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Messenger%21MessengerTrait.php/9
MessengerTrait.php | Drupal API
phpdrupalapi