https://api.drupal.org/api/drupal/core%21modules%21field%21src%21ProxyClass%21FieldUninstallValidator.php/property/FieldUninstallValidator%3A%3AdrupalProxyOriginalServiceId/10
FieldUninstallValidator::$drupalProxyOriginalServiceId | Drupal API
drupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21ProxyClass%21File%21MimeType%21MimeTypeGuesser.php/property/MimeTypeGuesser%3A%3AdrupalProxyOriginalServiceId/8.9.x
MimeTypeGuesser::$drupalProxyOriginalServiceId | Drupal API
drupalapi