46 files declare their use of PluginBase in Drupal 10

ActionBase.php in core/lib/Drupal/Core/Action/ActionBase.php

BlockBase.php in core/lib/Drupal/Core/Block/BlockBase.php

Breakpoint.php in core/modules/breakpoint/src/Breakpoint.php

Broken.php in core/lib/Drupal/Core/Block/Plugin/Block/Broken.php

CKEditor5PluginDefault.php in core/modules/ckeditor5/src/Plugin/CKEditor5PluginDefault.php

CKEditorPluginBase.php in core/modules/ckeditor/src/CKEditorPluginBase.php

ConfigNamesMapper.php in core/modules/config_translation/src/ConfigNamesMapper.php

ContextAwarePluginTraitTest.php in core/tests/Drupal/KernelTests/Core/Plugin/Context/ContextAwarePluginTraitTest.php

ContextHandlerTest.php in core/tests/Drupal/KernelTests/Core/Plugin/ContextHandlerTest.php

Contrib.php in core/modules/ckeditor5/src/Plugin/CKEditor4To5Upgrade/Contrib.php

Core.php in core/modules/ckeditor5/src/Plugin/CKEditor4To5Upgrade/Core.php

DestinationBase.php in core/modules/migrate/src/Plugin/migrate/destination/DestinationBase.php

DrupalMedia.php in core/modules/ckeditor/src/Plugin/CKEditorPlugin/DrupalMedia.php

EditorBase.php in core/modules/editor/src/Plugin/EditorBase.php

ExecutablePluginBase.php in core/lib/Drupal/Core/Executable/ExecutablePluginBase.php

FieldPluginBase.php in core/modules/migrate_drupal/src/Plugin/migrate/field/FieldPluginBase.php

FilterBase.php in core/modules/filter/src/Plugin/FilterBase.php

HelpSectionPluginBase.php in core/modules/help/src/Plugin/HelpSection/HelpSectionPluginBase.php

HelpTopicPluginBase.php in core/modules/help_topics/src/HelpTopicPluginBase.php

ImageEffectBase.php in core/modules/image/src/ImageEffectBase.php

ImageToolkitBase.php in core/lib/Drupal/Core/ImageToolkit/ImageToolkitBase.php

ImageToolkitOperationBase.php in core/lib/Drupal/Core/ImageToolkit/ImageToolkitOperationBase.php

InPlaceEditorBase.php in core/modules/quickedit/src/Plugin/InPlaceEditorBase.php

JoinPluginBase.php in core/modules/views/src/Plugin/views/join/JoinPluginBase.php

LayoutDefault.php in core/lib/Drupal/Core/Layout/LayoutDefault.php

LinkRelationType.php in core/lib/Drupal/Core/Http/LinkRelationType.php

MediaSourceBase.php in core/modules/media/src/MediaSourceBase.php

MenuLinkBase.php in core/lib/Drupal/Core/Menu/MenuLinkBase.php

Migration.php in core/modules/migrate/src/Plugin/Migration.php

MockComplexContextBlock.php in core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/mock_block/MockComplexContextBlock.php

MockUserNameBlock.php in core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/mock_block/MockUserNameBlock.php

NullIdMap.php in core/modules/migrate/src/Plugin/migrate/id_map/NullIdMap.php

PluginBase.php in core/modules/views/src/Plugin/views/PluginBase.php

PluginSettingsBase.php in core/lib/Drupal/Core/Field/PluginSettingsBase.php

ProcessPluginBase.php in core/modules/migrate/src/ProcessPluginBase.php

RenderElement.php in core/lib/Drupal/Core/Render/Element/RenderElement.php

ResourceBase.php in core/modules/rest/src/Plugin/ResourceBase.php

SearchPluginBase.php in core/modules/search/src/Plugin/SearchPluginBase.php

SectionStorageBase.php in core/modules/layout_builder/src/Plugin/SectionStorage/SectionStorageBase.php

SelectionPluginBase.php in core/lib/Drupal/Core/Entity/EntityReferenceSelection/SelectionPluginBase.php

SimpleConfigSectionStorage.php in core/modules/layout_builder/tests/modules/layout_builder_test/src/Plugin/SectionStorage/SimpleConfigSectionStorage.php

SourcePluginBase.php in core/modules/migrate/src/Plugin/migrate/source/SourcePluginBase.php

Sql.php in core/modules/migrate/src/Plugin/migrate/id_map/Sql.php

TipPluginBase.php in core/modules/tour/src/TipPluginBase.php

TypedDataStringBlock.php in core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/mock_block/TypedDataStringBlock.php

VariantBase.php in core/lib/Drupal/Core/Display/VariantBase.php