Expanded class hierarchy of SectionComponentBuildRenderArrayEvent in Drupal 9
- class \Drupal\Component\EventDispatcher\Event extends \Symfony\Component\EventDispatcher\Event
- class \Drupal\block_content\Event\BlockContentGetDependencyEvent
 - class \Drupal\config_translation\Event\ConfigMapperPopulateEvent
 - class \Drupal\Core\Config\ConfigCollectionInfo
 - class \Drupal\Core\Config\ConfigCrudEvent
 - class \Drupal\Core\Config\ConfigImporterEvent
 - class \Drupal\Core\Config\ConfigModuleOverridesEvent
 - class \Drupal\Core\Config\Importer\MissingContentEvent
 - class \Drupal\Core\Config\StorageTransformEvent
 - class \Drupal\Core\File\Event\FileUploadSanitizeNameEvent
 - class \Drupal\Core\Http\KernelEvent
 - class \Drupal\Core\Render\PageDisplayVariantSelectionEvent implements RefinableCacheableDependencyInterface uses RefinableCacheableDependencyTrait
 - class \Drupal\Core\Routing\RouteBuildEvent
 - class \Drupal\Core\Session\AccountSetEvent
 - class \Drupal\entity_events\Event\EntityEvent
 - class \Drupal\farm_map\Event\MapRenderEvent
 - class \Drupal\jsonapi\ResourceType\ResourceTypeBuildEvent
 - class \Drupal\language\Config\LanguageConfigOverrideCrudEvent
 - class \Drupal\layout_builder\Event\PrepareLayoutEvent
 - class \Drupal\layout_builder\Event\SectionComponentBuildRenderArrayEvent uses CacheableResponseTrait
 - class \Drupal\locale\LocaleEvent
 - class \Drupal\migrate\Event\EventBase
 - class \Drupal\migrate\Event\MigrateIdMapMessageEvent
 - class \Drupal\migrate\Event\MigrateMapDeleteEvent
 - class \Drupal\migrate\Event\MigrateMapSaveEvent
 - class \Drupal\migrate\Event\MigrateRollbackEvent
 - class \Drupal\migrate\Event\MigrateRowDeleteEvent
 - class \Drupal\price\EventBase
 - class \Drupal\price\EventBase
 - class \Drupal\rules_webform\Event\RulesWebformEventBase
 - class \Drupal\salesforce\Event\SalesforceBaseEvent
 - class \Drupal\scheduler\Event\EventBase
 - class \Drupal\scheduler_rules_integration\Event\EventBase
 - class \Drupal\theme_compiler\Event\OnDemandCompileEvent
 - class \Drupal\user\Event\UserFloodEvent