231 files declare their use of LanguageInterface

AccountForm.php in core/modules/user/src/AccountForm.php
ActiveLinkResponseFilter.php in core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php
AliasManager.php in core/lib/Drupal/Core/Path/AliasManager.php
AliasManagerTest.php in core/modules/path_alias/tests/src/Unit/AliasManagerTest.php
AliasRepository.php in core/lib/Drupal/Core/Path/AliasRepository.php
AliasStorage.php in core/lib/Drupal/Core/Path/AliasStorage.php
AliasStorageInterface.php in core/lib/Drupal/Core/Path/AliasStorageInterface.php
AliasTest.php in core/modules/path_alias/tests/src/Kernel/AliasTest.php
BlockContentCacheTagsTest.php in core/modules/block_content/tests/src/Functional/BlockContentCacheTagsTest.php
BlockPluginTrait.php in core/lib/Drupal/Core/Block/BlockPluginTrait.php
BlockViewBuilderTest.php in core/modules/block/tests/src/Kernel/BlockViewBuilderTest.php
book.module in core/modules/book/book.module
Allows users to create and organize related content in an outline.
ckeditor.admin.inc in core/modules/ckeditor/ckeditor.admin.inc
Callbacks and theming for the CKEditor toolbar configuration UI.
color.module in core/modules/color/color.module
Allows users to change the color scheme of themes.
CommentBaseFieldTest.php in core/modules/comment/tests/src/Kernel/CommentBaseFieldTest.php
CommentCSSTest.php in core/modules/comment/tests/src/Functional/CommentCSSTest.php
CommentEntityTest.php in core/modules/comment/tests/src/Functional/CommentEntityTest.php
CommentLinksTest.php in core/modules/comment/tests/src/Functional/CommentLinksTest.php
CommentNewIndicatorTest.php in core/modules/comment/tests/src/Functional/CommentNewIndicatorTest.php
ConfigLanguageOverrideWebTest.php in core/modules/config/tests/src/Functional/ConfigLanguageOverrideWebTest.php
ConfigMapperInterface.php in core/modules/config_translation/src/ConfigMapperInterface.php
ConfigMapperManagerTest.php in core/modules/config_translation/tests/src/Unit/ConfigMapperManagerTest.php
ConfigModuleOverridesEvent.php in core/lib/Drupal/Core/Config/ConfigModuleOverridesEvent.php
ConfigNamesMapper.php in core/modules/config_translation/src/ConfigNamesMapper.php
ConfigTestForm.php in core/modules/config/tests/config_test/src/ConfigTestForm.php
ConfigTranslationController.php in core/modules/config_translation/src/Controller/ConfigTranslationController.php
ConfigTranslationUiTest.php in core/modules/config_translation/tests/src/Functional/ConfigTranslationUiTest.php
ConfigurableLanguageInterface.php in core/modules/language/src/ConfigurableLanguageInterface.php
ConfigurableLanguageManager.php in core/modules/language/src/ConfigurableLanguageManager.php
ConfigurableLanguageManagerInterface.php in core/modules/language/src/ConfigurableLanguageManagerInterface.php
ConfigurableLanguageManagerTest.php in core/modules/language/tests/src/Kernel/ConfigurableLanguageManagerTest.php
ContentEntityBase.php in core/lib/Drupal/Core/Entity/ContentEntityBase.php
ContentEntityBaseUnitTest.php in core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
ContentEntityStorageBase.php in core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
ContentEntityTest.php in core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/ContentEntityTest.php
ContentLanguageSettings.php in core/modules/language/src/Entity/ContentLanguageSettings.php
ContentLanguageSettingsUnitTest.php in core/modules/language/tests/src/Unit/ContentLanguageSettingsUnitTest.php
ContentModerationStateTest.php in core/modules/content_moderation/tests/src/Kernel/ContentModerationStateTest.php
ContentTranslationController.php in core/modules/content_translation/src/Controller/ContentTranslationController.php
ContentTranslationDeleteForm.php in core/modules/content_translation/src/Form/ContentTranslationDeleteForm.php
ContentTranslationFieldSyncRevisionTest.php in core/modules/content_translation/tests/src/Kernel/ContentTranslationFieldSyncRevisionTest.php
ContentTranslationHandler.php in core/modules/content_translation/src/ContentTranslationHandler.php
ContentTranslationManageAccessCheck.php in core/modules/content_translation/src/Access/ContentTranslationManageAccessCheck.php
ContentTranslationUITestBase.php in core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
ContentTranslationUITestBase.php in core/modules/content_translation/tests/src/Functional/ContentTranslationUITestBase.php
ContentTranslationUpdateTest.php in core/modules/content_translation/tests/src/Functional/Update/ContentTranslationUpdateTest.php
ContentTranslationWorkflowsTest.php in core/modules/content_translation/tests/src/Functional/ContentTranslationWorkflowsTest.php
content_translation.admin.inc in core/modules/content_translation/content_translation.admin.inc
The content translation administration forms.
content_translation.install in core/modules/content_translation/content_translation.install
Installation functions for Content Translation module.
content_translation.module in core/modules/content_translation/content_translation.module
Allows entities to be translated into different languages.
contextual.module in core/modules/contextual/contextual.module
Adds contextual links to perform actions related to elements on a page.
DateFormat.php in core/modules/config_translation/src/FormElement/DateFormat.php
DateFormatFormBase.php in core/modules/system/src/Form/DateFormatFormBase.php
DefaultViewsTest.php in core/modules/views/tests/src/Functional/DefaultViewsTest.php
DeprecatedPathHooksTest.php in core/modules/system/tests/src/Kernel/DeprecatedPathHooksTest.php
DisplayPluginBase.php in core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
ElementInterface.php in core/modules/config_translation/src/FormElement/ElementInterface.php
EntityAccessControlHandler.php in core/lib/Drupal/Core/Entity/EntityAccessControlHandler.php
EntityAccessControlHandlerTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityAccessControlHandlerTest.php
EntityAdapterUnitTest.php in core/tests/Drupal/Tests/Core/Entity/TypedData/EntityAdapterUnitTest.php
EntityBase.php in core/lib/Drupal/Core/Entity/EntityBase.php
EntityCacheTagsTestBase.php in core/modules/system/src/Tests/Entity/EntityCacheTagsTestBase.php
EntityCacheTagsTestBase.php in core/modules/system/tests/src/Functional/Entity/EntityCacheTagsTestBase.php
EntityConverter.php in core/lib/Drupal/Core/ParamConverter/EntityConverter.php
EntityConverterTest.php in core/tests/Drupal/Tests/Core/ParamConverter/EntityConverterTest.php
EntityCrudHookTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityCrudHookTest.php
EntityDecoupledTranslationRevisionsTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityDecoupledTranslationRevisionsTest.php
EntityDefaultLanguageTest.php in core/modules/language/tests/src/Kernel/EntityDefaultLanguageTest.php
EntityDefinitionUpdateTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateTest.php
EntityDisplayRepository.php in core/lib/Drupal/Core/Entity/EntityDisplayRepository.php
EntityListBuilderTest.php in core/modules/system/tests/src/Functional/Entity/EntityListBuilderTest.php
EntityReferenceItemTest.php in core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php
EntityReferenceSelectionAccessTest.php in core/modules/system/tests/src/Functional/Entity/EntityReferenceSelection/EntityReferenceSelectionAccessTest.php
EntityRepository.php in core/lib/Drupal/Core/Entity/EntityRepository.php
EntityRepositoryTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityRepositoryTest.php
EntityRepositoryTest.php in core/tests/Drupal/Tests/Core/Entity/EntityRepositoryTest.php
EntityTestTextItemNormalizerTest.php in core/modules/system/tests/modules/entity_test/tests/src/Functional/Rest/EntityTestTextItemNormalizerTest.php
EntityTranslationFormTest.php in core/modules/system/tests/src/Functional/Entity/EntityTranslationFormTest.php
EntityTranslationTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityTranslationTest.php
EntityUrlLanguageTest.php in core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
EntityUuidConverter.php in core/modules/jsonapi/src/ParamConverter/EntityUuidConverter.php
EntityViewBuilderTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityViewBuilderTest.php
EntityWithUriCacheTagsTestBase.php in core/modules/system/src/Tests/Entity/EntityWithUriCacheTagsTestBase.php
EntityWithUriCacheTagsTestBase.php in core/modules/system/tests/src/Functional/Entity/EntityWithUriCacheTagsTestBase.php
ExportForm.php in core/modules/locale/src/Form/ExportForm.php
FieldItemList.php in core/lib/Drupal/Core/Field/FieldItemList.php
FieldKernelTestBase.php in core/modules/field/tests/src/Kernel/FieldKernelTestBase.php
FieldTestBase.php in core/modules/field/src/Tests/FieldTestBase.php
FieldTestBase.php in core/modules/field/tests/src/Functional/FieldTestBase.php
FieldTranslationSqlStorageTest.php in core/tests/Drupal/KernelTests/Core/Entity/FieldTranslationSqlStorageTest.php
FileTranslation.php in core/lib/Drupal/Core/StringTranslation/Translator/FileTranslation.php
FilterAPITest.php in core/modules/filter/tests/src/Kernel/FilterAPITest.php
FilterTestCacheContexts.php in core/modules/filter/tests/filter_test/src/Plugin/Filter/FilterTestCacheContexts.php
FormatterBase.php in core/lib/Drupal/Core/Field/FormatterBase.php
FormElementBase.php in core/modules/config_translation/src/FormElement/FormElementBase.php
FormTestController.php in core/modules/system/tests/modules/form_test/src/Controller/FormTestController.php
FormTestLanguageSelectForm.php in core/modules/system/tests/modules/form_test/src/Form/FormTestLanguageSelectForm.php
FrontPageTest.php in core/modules/node/tests/src/Functional/Views/FrontPageTest.php
GlossaryTest.php in core/modules/views/tests/src/Functional/GlossaryTest.php
HelpSearch.php in core/modules/help_topics/src/Plugin/Search/HelpSearch.php
HelpTopicSection.php in core/modules/help_topics/src/Plugin/HelpSection/HelpTopicSection.php
JsonApiRegressionTest.php in core/modules/jsonapi/tests/src/Functional/JsonApiRegressionTest.php
language.api.php in core/lib/Drupal/Core/Language/language.api.php
Hooks provided by the base system for language support.
language.module in core/modules/language/language.module
Add language handling functionality to Drupal.
Language.php in core/modules/language/src/Plugin/Condition/Language.php
Language.php in core/modules/ckeditor/src/Plugin/CKEditorPlugin/Language.php
LanguageConfigFactoryOverride.php in core/modules/language/src/Config/LanguageConfigFactoryOverride.php
LanguageConfigFactoryOverrideInterface.php in core/modules/language/src/Config/LanguageConfigFactoryOverrideInterface.php
LanguageConfiguration.php in core/modules/language/src/Element/LanguageConfiguration.php
LanguageConfigurationElementTest.php in core/modules/language/tests/src/Functional/LanguageConfigurationElementTest.php
LanguageConfigurationTest.php in core/modules/language/tests/src/Functional/LanguageConfigurationTest.php
LanguageCustomLanguageConfigurationTest.php in core/modules/language/tests/src/Functional/LanguageCustomLanguageConfigurationTest.php
LanguageFallbackTest.php in core/modules/language/tests/src/Kernel/LanguageFallbackTest.php
LanguageFilter.php in core/modules/views/src/Plugin/views/filter/LanguageFilter.php
LanguageFormatter.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/LanguageFormatter.php
LanguageFormBase.php in core/modules/language/src/Form/LanguageFormBase.php
LanguageItem.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
LanguageListTest.php in core/modules/language/tests/src/Functional/LanguageListTest.php
LanguageNegotiationContentEntityTest.php in core/modules/language/tests/src/Functional/LanguageNegotiationContentEntityTest.php
LanguageNegotiationInfoTest.php in core/modules/language/tests/src/Functional/LanguageNegotiationInfoTest.php
LanguageNegotiationMethodBase.php in core/modules/language/src/LanguageNegotiationMethodBase.php
LanguageNegotiationMethodInterface.php in core/modules/language/src/LanguageNegotiationMethodInterface.php
LanguageNegotiationSession.php in core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationSession.php
LanguageNegotiationUrl.php in core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrl.php
LanguageNegotiationUrlTest.php in core/modules/language/tests/src/Unit/LanguageNegotiationUrlTest.php
LanguageSelect.php in core/lib/Drupal/Core/Render/Element/LanguageSelect.php
LanguageSelectElementTest.php in core/modules/system/tests/src/Functional/Form/LanguageSelectElementTest.php
LanguageSelectWidget.php in core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/LanguageSelectWidget.php
LanguageServiceProvider.php in core/modules/language/src/LanguageServiceProvider.php
LanguageSwitchingTest.php in core/modules/language/tests/src/Functional/LanguageSwitchingTest.php
LanguageUILanguageNegotiationTest.php in core/modules/language/tests/src/Functional/LanguageUILanguageNegotiationTest.php
LanguageUnitTest.php in core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
LanguageUrlRewritingTest.php in core/modules/language/tests/src/Functional/LanguageUrlRewritingTest.php
language_test.module in core/modules/language/tests/language_test/language_test.module
Mock module for language layer tests.
LegacyAliasStorageTest.php in core/tests/Drupal/KernelTests/Core/Path/LegacyAliasStorageTest.php
ListElement.php in core/modules/config_translation/src/FormElement/ListElement.php
locale.bulk.inc in core/modules/locale/locale.bulk.inc
Mass import-export and batch import functionality for Gettext .po files.
locale.module in core/modules/locale/locale.module
Enables the translation of the user interface to languages other than English.
LocaleConfigTranslationTest.php in core/modules/locale/tests/src/Functional/LocaleConfigTranslationTest.php
LocaleConfigurableLanguageManagerTest.php in core/modules/locale/tests/src/Kernel/LocaleConfigurableLanguageManagerTest.php
LocaleContentTest.php in core/modules/locale/tests/src/Functional/LocaleContentTest.php
LocaleImportFunctionalTest.php in core/modules/locale/tests/src/Functional/LocaleImportFunctionalTest.php
LocaleJavascriptTranslationTest.php in core/modules/locale/tests/src/Functional/LocaleJavascriptTranslationTest.php
LocalePathTest.php in core/modules/locale/tests/src/Functional/LocalePathTest.php
LocaleTranslation.php in core/modules/locale/src/LocaleTranslation.php
LocaleTranslationUiTest.php in core/modules/locale/tests/src/Functional/LocaleTranslationUiTest.php
LocaleUpdateTest.php in core/modules/locale/tests/src/Functional/LocaleUpdateTest.php
MachineName.php in core/modules/migrate/src/Plugin/migrate/process/MachineName.php
MachineName.php in core/lib/Drupal/Core/Render/Element/MachineName.php
MachineNameTest.php in core/tests/Drupal/Tests/Core/Render/Element/MachineNameTest.php
ManageDisplayTest.php in core/modules/field_ui/tests/src/Functional/ManageDisplayTest.php
ManageFieldsFunctionalTest.php in core/modules/field_ui/tests/src/Functional/ManageFieldsFunctionalTest.php
MediaEmbedFilterTestBase.php in core/modules/media/tests/src/Kernel/MediaEmbedFilterTestBase.php
MenuForm.php in core/modules/menu_ui/src/MenuForm.php
MenuLinkContentCacheabilityBubblingTest.php in core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php
MenuLinkContentEntityAccessTest.php in core/modules/menu_link_content/tests/src/Unit/MenuLinkContentEntityAccessTest.php
MigrateEntityTranslationSettingsTest.php in core/modules/content_translation/tests/src/Kernel/Migrate/d7/MigrateEntityTranslationSettingsTest.php
MigrateLanguageContentMenuSettingsTest.php in core/modules/language/tests/src/Kernel/Migrate/d6/MigrateLanguageContentMenuSettingsTest.php
MigrateLanguageContentTaxonomyVocabularySettingsTest.php in core/modules/language/tests/src/Kernel/Migrate/d6/MigrateLanguageContentTaxonomyVocabularySettingsTest.php
MigrateLanguageContentTaxonomyVocabularySettingsTest.php in core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageContentTaxonomyVocabularySettingsTest.php
NegotiationSelectedForm.php in core/modules/language/src/Form/NegotiationSelectedForm.php
NegotiationUrlForm.php in core/modules/language/src/Form/NegotiationUrlForm.php
node.tokens.inc in core/modules/node/node.tokens.inc
Builds placeholder replacement tokens for node-related data.
NodeAccessLanguageAwareCombinationTest.php in core/modules/node/tests/src/Kernel/NodeAccessLanguageAwareCombinationTest.php
NodeAccessLanguageAwareTest.php in core/modules/node/tests/src/Kernel/NodeAccessLanguageAwareTest.php
NodeAccessLanguageTest.php in core/modules/node/tests/src/Kernel/NodeAccessLanguageTest.php
NodeCreationTest.php in core/modules/node/tests/src/Functional/NodeCreationTest.php
NodeFieldMultilingualTest.php in core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php
NodeLanguageTest.php in core/modules/node/tests/src/Functional/Views/NodeLanguageTest.php
NodeListBuilder.php in core/modules/node/src/NodeListBuilder.php
NodeListBuilderTest.php in core/modules/node/tests/src/Kernel/NodeListBuilderTest.php
NodeSearch.php in core/modules/node/src/Plugin/Search/NodeSearch.php
NodeStorage.php in core/modules/node/src/NodeStorage.php
NodeStorageInterface.php in core/modules/node/src/NodeStorageInterface.php
NodeTranslationUITest.php in core/modules/node/tests/src/Functional/NodeTranslationUITest.php
NodeTypeInitialLanguageTest.php in core/modules/node/tests/src/Functional/NodeTypeInitialLanguageTest.php
PageCacheTagsIntegrationTest.php in core/modules/page_cache/tests/src/Functional/PageCacheTagsIntegrationTest.php
PagePreviewTest.php in core/modules/node/tests/src/Functional/PagePreviewTest.php
path.module in core/modules/path/path.module
Enables users to rename URLs.
path.post_update.php in core/modules/path/path.post_update.php
Post update functions for the path module.
PathAlias.php in core/modules/path_alias/src/Entity/PathAlias.php
PathAliasResourceTestBase.php in core/modules/path_alias/tests/src/Functional/Rest/PathAliasResourceTestBase.php
PathAliasTestTrait.php in core/tests/Drupal/Tests/Traits/Core/PathAliasTestTrait.php
PathLanguageUiTest.php in core/modules/path/tests/src/Functional/PathLanguageUiTest.php
PathPluginBase.php in core/modules/views/src/Plugin/views/display/PathPluginBase.php
PathProcessorTest.php in core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
PluginBase.php in core/modules/views/src/Plugin/views/PluginBase.php
PluralVariants.php in core/modules/config_translation/src/FormElement/PluralVariants.php
QuickEditAutocompleteTermTest.php in core/modules/quickedit/tests/src/FunctionalJavascript/QuickEditAutocompleteTermTest.php
QuickEditEntityFieldAccessCheckTest.php in core/modules/quickedit/tests/src/Unit/Access/QuickEditEntityFieldAccessCheckTest.php
QuickEditIntegrationTest.php in core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php
RenderCacheIntegrationTest.php in core/modules/views/tests/src/Kernel/RenderCacheIntegrationTest.php
RouteCachingNonPathLanguageNegotiationTest.php in core/tests/Drupal/FunctionalTests/Routing/RouteCachingNonPathLanguageNegotiationTest.php
RouteProvider.php in core/lib/Drupal/Core/Routing/RouteProvider.php
RouterTest.php in core/modules/system/tests/src/Functional/Routing/RouterTest.php
search.pages.inc in core/modules/search/search.pages.inc
User page callbacks for the Search module.
SearchableHelpInterface.php in core/modules/help_topics/src/SearchableHelpInterface.php
SearchDeprecationTest.php in core/modules/search/tests/src/Kernel/SearchDeprecationTest.php
SearchMatchTest.php in core/modules/search/tests/src/Kernel/SearchMatchTest.php
SearchNumberMatchingTest.php in core/modules/search/tests/src/Functional/SearchNumberMatchingTest.php
SearchNumbersTest.php in core/modules/search/tests/src/Functional/SearchNumbersTest.php
SqlContentEntityStorage.php in core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php
SqlContentEntityStorageSchema.php in core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php
system.module in core/modules/system/system.module
Configuration system that lets administrators modify the workings of the site.
TaxonomyFieldFilterTest.php in core/modules/taxonomy/tests/src/Functional/Views/TaxonomyFieldFilterTest.php
TaxonomyTestBase.php in core/modules/taxonomy/tests/src/Kernel/Views/TaxonomyTestBase.php
TaxonomyTestBase.php in core/modules/taxonomy/tests/src/Functional/Views/TaxonomyTestBase.php
TaxonomyTestTrait.php in core/modules/taxonomy/src/Tests/TaxonomyTestTrait.php
TaxonomyTestTrait.php in core/modules/taxonomy/tests/src/Traits/TaxonomyTestTrait.php
TermLanguageTest.php in core/modules/taxonomy/tests/src/Functional/TermLanguageTest.php
TermTranslationUITest.php in core/modules/taxonomy/tests/src/Functional/TermTranslationUITest.php
TestHelpSection.php in core/modules/help_topics/tests/modules/help_topics_test/src/Plugin/HelpSection/TestHelpSection.php
Textarea.php in core/modules/config_translation/src/FormElement/Textarea.php
Textfield.php in core/modules/config_translation/src/FormElement/Textfield.php
TextFormat.php in core/modules/config_translation/src/FormElement/TextFormat.php
Token.php in core/lib/Drupal/Core/Utility/Token.php
TokenTest.php in core/tests/Drupal/Tests/Core/Utility/TokenTest.php
ToolbarAdminMenuTest.php in core/modules/toolbar/tests/src/Functional/ToolbarAdminMenuTest.php
TrackerTestBase.php in core/modules/tracker/src/Tests/Views/TrackerTestBase.php
TrackerTestBase.php in core/modules/tracker/tests/src/Functional/Views/TrackerTestBase.php
TranslationLanguageRenderer.php in core/modules/views/src/Entity/Render/TranslationLanguageRenderer.php
TwigTransTest.php in core/modules/system/tests/src/Functional/Theme/TwigTransTest.php
TwigWhiteListTest.php in core/tests/Drupal/KernelTests/Core/Theme/TwigWhiteListTest.php
UrlAliasLanguage.php in core/modules/path/src/Plugin/migrate/process/d6/UrlAliasLanguage.php
User.php in core/modules/user/src/Entity/User.php
UserAdminLanguageTest.php in core/modules/user/tests/src/Functional/UserAdminLanguageTest.php
UserLanguageTest.php in core/modules/user/tests/src/Functional/UserLanguageTest.php
View.php in core/modules/views/src/Entity/View.php
views.api.php in core/modules/views/views.api.php
Describes hooks and plugins provided by the Views module.
ViewUIObjectTest.php in core/modules/views_ui/tests/src/Unit/ViewUIObjectTest.php
VocabularyForm.php in core/modules/taxonomy/src/VocabularyForm.php

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