14 files declare their use of Extension
- ComponentNegotiator.php in core/
lib/ Drupal/ Core/ Theme/ ComponentNegotiator.php - DrupalKernel.php in core/
lib/ Drupal/ Core/ DrupalKernel.php - GenerateTheme.php in core/
lib/ Drupal/ Core/ Command/ GenerateTheme.php - InstallStorage.php in core/
lib/ Drupal/ Core/ Config/ InstallStorage.php - LinkRelationTypeManager.php in core/
lib/ Drupal/ Core/ Http/ LinkRelationTypeManager.php - ModulesListForm.php in core/
modules/ system/ src/ Form/ ModulesListForm.php - ProjectInfo.php in core/
lib/ Drupal/ Core/ Utility/ ProjectInfo.php - StagedDBUpdateValidator.php in core/
modules/ package_manager/ src/ Validator/ StagedDBUpdateValidator.php - system.module in core/
modules/ system/ system.module - SystemHooks.php in core/
modules/ system/ src/ Hook/ SystemHooks.php - TestRunnerKernel.php in core/
lib/ Drupal/ Core/ Test/ TestRunnerKernel.php - ThemeInitialization.php in core/
lib/ Drupal/ Core/ Theme/ ThemeInitialization.php - ThemeInitializationInterface.php in core/
lib/ Drupal/ Core/ Theme/ ThemeInitializationInterface.php - UpdateRegistry.php in core/
lib/ Drupal/ Core/ Update/ UpdateRegistry.php