Change record status: 
Introduced in branch: 
3.x
Introduced in version: 
3.1.0
Description: 

Events in \Drupal\hook_event_dispatcher\HookEventDispatcherInterface are deprecated, use following constants instead:

Old constant New constant
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::ENTITY_* \Drupal\core_event_dispatcher\EntityHookEvents::ENTITY_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::WIDGET_SINGLE_ELEMENT_FORM_ALTER \Drupal\field_event_dispatcher\FieldHookEvents::WIDGET_SINGLE_ELEMENT_FORM_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::WIDGET_COMPLETE_FORM_ALTER \Drupal\field_event_dispatcher\FieldHookEvents::WIDGET_COMPLETE_FORM_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::FIELD_* \Drupal\field_event_dispatcher\FieldHookEvents::FIELD_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::FILE_* \Drupal\core_event_dispatcher\FileHookEvents::FILE_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::ARCHIVER_INFO_ALTER \Drupal\core_event_dispatcher\FileHookEvents::ARCHIVER_INFO_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::FORM_ALTER \Drupal\core_event_dispatcher\FormHookEvents::FORM_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::BLOCK_* \Drupal\core_event_dispatcher\BlockHookEvents::BLOCK_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::TOKEN_* \Drupal\core_event_dispatcher\TokenHookEvents::TOKEN_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::PATH_* \Drupal\path_event_dispatcher\PathHookEvents::PATH_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::VIEWS_* \Drupal\views_event_dispatcher\ViewsHookEvents::VIEWS_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::THEME \Drupal\core_event_dispatcher\ThemeHookEvents::THEME
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::THEME_REGISTRY_ALTER \Drupal\core_event_dispatcher\ThemeHookEvents::THEME_REGISTRY_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::THEME_SUGGESTIONS_ALTER \Drupal\core_event_dispatcher\ThemeHookEvents::THEME_SUGGESTIONS_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::THEMES_INSTALLED \Drupal\core_event_dispatcher\ThemeHookEvents::THEMES_INSTALLED
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::TEMPLATE_PREPROCESS_DEFAULT_VARIABLES_ALTER \Drupal\core_event_dispatcher\ThemeHookEvents::TEMPLATE_PREPROCESS_DEFAULT_VARIABLES_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::JS_ALTER \Drupal\core_event_dispatcher\ThemeHookEvents::JS_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::LIBRARY_INFO_ALTER \Drupal\core_event_dispatcher\ThemeHookEvents::LIBRARY_INFO_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::USER_* \Drupal\user_event_dispatcher\UserHookEvents::USER_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::TOOLBAR \Drupal\toolbar_event_dispatcher\ToolbarHookEvents::TOOLBAR
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::TOOLBAR_ALTER \Drupal\toolbar_event_dispatcher\ToolbarHookEvents::TOOLBAR_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::PAGE_* \Drupal\core_event_dispatcher\PageHookEvents::PAGE_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::CRON \Drupal\core_event_dispatcher\CoreHookEvents::CRON
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::DATA_TYPE_INFO_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::DATA_TYPE_INFO_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::QUEUE_INFO_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::QUEUE_INFO_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::MAIL_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::MAIL_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::MAIL_BACKEND_INFO_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::MAIL_BACKEND_INFO_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::COUNTRIES_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::COUNTRIES_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::DISPLAY_VARIANT_PLUGIN_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::DISPLAY_VARIANT_PLUGIN_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::LAYOUT_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::LAYOUT_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::CACHE_FLUSH \Drupal\core_event_dispatcher\CoreHookEvents::CACHE_FLUSH
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::REBUILD \Drupal\core_event_dispatcher\CoreHookEvents::REBUILD
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::CONFIG_IMPORT_STEPS_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::CONFIG_IMPORT_STEPS_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::CONFIG_SCHEMA_INFO_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::CONFIG_SCHEMA_INFO_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::VALIDATION_CONSTRAINT_ALTER \Drupal\core_event_dispatcher\CoreHookEvents::VALIDATION_CONSTRAINT_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::LANGUAGE_SWITCH_LINKS_ALTER \Drupal\core_event_dispatcher\LanguageHookEvents::LANGUAGE_SWITCH_LINKS_ALTER
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::WEBFORM_* \Drupal\webform_event_dispatcher\WebformHookEvents::WEBFORM_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::MEDIA_* \Drupal\media_event_dispatcher\MediaHookEvents::MEDIA_*
\Drupal\hook_event_dispatcher\HookEventDispatcherInterface::JSONAPI_* \Drupal\jsonapi_event_dispatcher\JsonApiHookEvents::JSONAPI_*
Impacts: 
Module developers