48 files declare their use of DeriverBase

AddModerationDeriver.php in core/modules/content_moderation/src/Plugin/ConfigAction/AddModerationDeriver.php
BlockContent.php in core/modules/block_content/src/Plugin/Derivative/BlockContent.php
ConfigTranslationContextualLinks.php in core/modules/config_translation/src/Plugin/Derivative/ConfigTranslationContextualLinks.php
ConfigTranslationLocalTasks.php in core/modules/config_translation/src/Plugin/Derivative/ConfigTranslationLocalTasks.php
ContentEntityDeriver.php in core/modules/migrate_drupal/src/Plugin/migrate/source/ContentEntityDeriver.php
ContentTranslationContextualLinks.php in core/modules/content_translation/src/Plugin/Derivative/ContentTranslationContextualLinks.php
ContentTranslationLocalTasks.php in core/modules/content_translation/src/Plugin/Derivative/ContentTranslationLocalTasks.php
CronQueueTestDeriver.php in core/modules/system/tests/modules/cron_queue_test/src/Plugin/Derivative/CronQueueTestDeriver.php
D6NodeDeriver.php in core/modules/node/src/Plugin/migrate/D6NodeDeriver.php
D6TermNodeDeriver.php in core/modules/taxonomy/src/Plugin/migrate/D6TermNodeDeriver.php
D7NodeDeriver.php in core/modules/node/src/Plugin/migrate/D7NodeDeriver.php
D7TaxonomyTermDeriver.php in core/modules/taxonomy/src/Plugin/migrate/D7TaxonomyTermDeriver.php
DefaultSelectionDeriver.php in core/lib/Drupal/Core/Entity/Plugin/Derivative/DefaultSelectionDeriver.php
DefaultWizardDeriver.php in core/modules/views/src/Plugin/Derivative/DefaultWizardDeriver.php
DynamicLocalTasks.php in core/modules/media/src/Plugin/Derivative/DynamicLocalTasks.php
DynamicLocalTasks.php in core/modules/content_moderation/src/Plugin/Derivative/DynamicLocalTasks.php
EntityActionDeriverBase.php in core/lib/Drupal/Core/Action/Plugin/Action/Derivative/EntityActionDeriverBase.php
EntityBundle.php in core/lib/Drupal/Core/Entity/Plugin/Condition/Deriver/EntityBundle.php
EntityCreateDeriver.php in core/lib/Drupal/Core/Config/Action/Plugin/ConfigAction/Deriver/EntityCreateDeriver.php
EntityMethodDeriver.php in core/lib/Drupal/Core/Config/Action/Plugin/ConfigAction/Deriver/EntityMethodDeriver.php
EntityReferenceTranslationDeriver.php in core/modules/migrate_drupal/src/Plugin/migrate/EntityReferenceTranslationDeriver.php
EntityTestLocalTasks.php in core/modules/system/tests/modules/entity_test/src/Plugin/Derivative/EntityTestLocalTasks.php
ExtraFieldBlockDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/ExtraFieldBlockDeriver.php
FieldBlockDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/FieldBlockDeriver.php
FieldUiLocalAction.php in core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalAction.php
FieldUiLocalTask.php in core/modules/field_ui/src/Plugin/Derivative/FieldUiLocalTask.php
InlineBlockDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/InlineBlockDeriver.php
LanguageBlock.php in core/modules/language/src/Plugin/Derivative/LanguageBlock.php
LayoutBuilderLocalTaskDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/LayoutBuilderLocalTaskDeriver.php
LayoutPluginManagerTest.php in core/tests/Drupal/Tests/Core/Layout/LayoutPluginManagerTest.php
LocalActionTest.php in core/modules/system/tests/modules/menu_test/src/Plugin/Derivative/LocalActionTest.php
LocalTaskTest.php in core/modules/system/tests/modules/menu_test/src/Plugin/Derivative/LocalTaskTest.php
LocalTaskTestWithUnsafeTitle.php in core/modules/system/tests/modules/menu_test/src/Plugin/Derivative/LocalTaskTestWithUnsafeTitle.php
MenuLinkContentDeriver.php in core/modules/menu_link_content/src/Plugin/Deriver/MenuLinkContentDeriver.php
MenuLinkTestWithUnsafeTitle.php in core/modules/system/tests/modules/menu_test/src/Plugin/Derivative/MenuLinkTestWithUnsafeTitle.php
OEmbedDeriver.php in core/modules/media/src/Plugin/media/Source/OEmbedDeriver.php
PermissionsPerBundleDeriver.php in core/lib/Drupal/Core/Config/Action/Plugin/ConfigAction/Deriver/PermissionsPerBundleDeriver.php
SearchLocalTask.php in core/modules/search/src/Plugin/Derivative/SearchLocalTask.php
SystemMenuBlock.php in core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php
SystemMenuNavigationBlock.php in core/modules/navigation/src/Plugin/Derivative/SystemMenuNavigationBlock.php
TestDataTypeDeriver.php in core/tests/Drupal/Tests/Core/Plugin/Fixtures/Plugin/DataType/TestDataTypeDeriver.php
ThemeLocalTask.php in core/modules/block/src/Plugin/Derivative/ThemeLocalTask.php
ThemeLocalTask.php in core/modules/system/src/Plugin/Derivative/ThemeLocalTask.php
UserLocalTask.php in core/modules/user/src/Plugin/Derivative/UserLocalTask.php
VersionHistoryLocalTasks.php in core/lib/Drupal/Core/Entity/Plugin/Derivative/VersionHistoryLocalTasks.php
ViewsEntityArgumentValidator.php in core/modules/views/src/Plugin/Derivative/ViewsEntityArgumentValidator.php
ViewsLocalTask.php in core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php
ViewsMenuLink.php in core/modules/views/src/Plugin/Derivative/ViewsMenuLink.php

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