6 files declare their use of EntityTypeListenerInterface in Drupal 8

EntityDefinitionUpdateManagerTest.php in core/tests/Drupal/Tests/Core/Entity/EntityDefinitionUpdateManagerTest.php

EntitySchemaSubscriber.php in core/modules/workspaces/src/EventSubscriber/EntitySchemaSubscriber.php

EntitySchemaSubscriber.php in core/modules/system/tests/modules/entity_test_update/src/EventSubscriber/EntitySchemaSubscriber.php

EntityStorageSchemaInterface.php in core/lib/Drupal/Core/Entity/Schema/EntityStorageSchemaInterface.php

EntityTestDefinitionSubscriber.php in core/modules/system/tests/modules/entity_test/src/EntityTestDefinitionSubscriber.php

ViewsEntitySchemaSubscriber.php in core/modules/views/src/EventSubscriber/ViewsEntitySchemaSubscriber.php