https://api.drupal.org/api/drupal/core%21modules%21file%21src%21FileUsage%21FileUsageBase.php/class/FileUsageBase/11.x
class FileUsageBase | Drupal API
classdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21file%21src%21FileUsage%21FileUsageBase.php/class/FileUsageBase/10
class FileUsageBase | Drupal API
classdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21file%21src%21FileUsage%21FileUsageBase.php/10
FileUsageBase.php | Drupal API
phpdrupalapi