Merge "tests: Use ::class for class name resolution"

[mediawiki.git] / RELEASE-NOTES-1.43

= MediaWiki 1.43 =

== MediaWiki 1.43.0-PRERELEASE ==

THIS IS NOT A RELEASE YET

MediaWiki 1.43 is an alpha-quality development branch, and is not recommended
for use in production.

== Upgrading notes for 1.43 ==
Don't forget to always back up your database before upgrading!

See the file UPGRADE for more detailed per-version upgrade instructions from the
oldest supported upgrading version, MediaWiki 1.35.

Some specific notes for MediaWiki 1.43 upgrades are below:

* It is now necessary that the OpenSSL PHP extension is installed.
* …

For notes on 1.42.x and older releases, see HISTORY.

=== Configuration changes for system administrators in 1.43 ===

* $wgBlockTargetMigrationStage, which was introduced in 1.42, is now deprecated
  and has no effect.
* …

==== New configuration ====

* (T13555) $wgParserEnableLegacyHeadingDOM - Defaults to `true`, can be set to
  `false` to enable new, more accessible HTML markup for wikitext headings.
  Note that each skin must also use the 'supportsMwHeading' option to allow it.
  More information: https://www.mediawiki.org/wiki/Heading_HTML_changes
  In a future release the new markup will become the default,
  and later this option will be removed.
* (T12347) $wgEnableProtectionIndicators - Defaults to false, setting it to true
  shows a lock icon indicator on protected pages.
* (T373480) $wgSortedCategories - Defaults to false, setting it to true will
  sort the categories shown on article pages.  This is an experimental setting;
  its future will depend on community adoption and feedback on the phab task
  is welcome.
* …

==== Changed configuration ====

* wgPageLinksSchemaMigrationStage – (T299947) This temporary setting, which
  controls the database schema migration for the page links table, is now set
  by default to write to both old and new data and read from the new data.
* wgFooterIcons – (T256190) The default "Powered by MediaWiki" button icon has
  been updated to an SVG icon, and the footer icons are now wrapped as buttons
  in HTML, rather than faking it within the icons themselves. You should adjust
  any footer icons you provide or over-ride to match.
* The "error-json" channel, configurable via $wgDebugLogGroups, has been
  removed. For structured logging, use the "error" channel directly instead.
  Since MediaWiki 1.25, structured logging is supported via Monolog for all
  channels, including the "error" channel. For silenced errors, you use the
  "silenced-error" channel added in MediaWiki 1.42. (T193472)
* wgResourceLoaderUseObjectCacheForDeps - (T343492) This is now enabled by
  default. This means ResourceLoader writes information to the MainStash
  instead of a core database table, which can be set to a separate database
  via wgMainStash. If you find issues, please drop a comment on T343492.
  It is now deprecated and will be removed in MediaWiki 1.44.
* …

==== Removed configuration ====

* wgSessionInsecureSecrets has been removed since OpenSSL is now a required
  PHP extension.
* $wgTemplateLinksSchemaMigrationStage has been removed.
* $wgSamplingStatsdClient has been removed. It was introduced in MW 1.28 for
  use in the Wikibase extension, but never used. The new StatsFactory service
  should be used for new instrumentations, which already supports sampling.
  Beware that sampling is generally not needed even at scale, and that sampling
  does not significantly reduce runtime overhead, thus making it slow to
  instrument very hot code even with built-in sampling.
* (T294397) The 'writeapi' userright, which controlled access to some API
  modules, has been removed.
* …

=== New user-facing features in 1.43 ===

* (T338341) Support reading XMP and EXIF from WebP files
* (T365636) Wiki's with wgAllowExternalImages enabled now detect urls
  with AVIF, SVG and WebP images.
* (T242346) Special:TalkPage is a new special page that will redirect to the
  associated talk namespace page, e.g. [[Special:TalkPage/Foo]] redirects to
  [[Talk:Foo]]; [[Special:TalkPage/Project:Foo]] goes to [[Project talk:Foo]].
  This allows for links by templates and tools without having to parse what
  namespaces are valid and have associated talk pages.
* New preference: "Send password reset emails only when both email address
  and username are provided."
* (T4085) Added new magic word {{USERLANGUAGE}} which returns the language code
  of the interface set by the user.
* …

=== New features for sysadmins in 1.43 ===

* …

=== New developer features in 1.43 ===

* StatusValue class gained new method getMessages(): MessageSpecifier[],
  allowing the errors to be inspected and displayed more easily, for example:
    foreach ( $status->getMessages() as $msg ) {
      if ( $msg->getKey() !== 'ignored-message' ) {
        $this->getOutput()->addWikiMsg( $msg );
      }
    }
* The REST API framework now supports defining redirects in route definition
  files. See MediaWiki\Rest\Handler\RedirectHandler for details.
* (T13555) Skins can enable the 'supportsMwHeading' option for new, more
  accessible HTML markup for wikitext headings. MediaWiki's own styles and
  scripts have been updated to support it, but your skin may also need updates.
  More information: https://www.mediawiki.org/wiki/Heading_HTML_changes
  A future release will emit deprecation warnings for skins with
  'supportsMwHeading' set to false.
* The AuthPreserveQueryParams hook was added.
* (T219397) New `Language::formatDurationBetweenTimestamps()` function added
  which takes two timestamps and a precision in order to calculate a more
  accurate text representation of duration.
* Added an interactive mode to the install.php maintenance script.
* The ResourceLoaderModifyStartupSourceUrls hook was added.
* The AuthManagerFilterProviders hook was added.
* The AuthManagerVerifyAuthentication hook was added.
* The OutputPageRenderCategoryLink hook was added, as a replacement for the
  deprecated OutputPageMakeCategoryLinks hook.
* PreAuthenticationProvider, PrimaryAuthenticationProvider, and
  SecondaryAuthenticationProvider now receive a `canAlwaysAutocreate` flag in
  the options of the `testUserForCreation` invocation. This flag is true when
  the session provider is exempt from autocreate user permissions checks.
* The CentralIdLookup service gained the isOwned() method, which can be used
  to check if a local username is reserved for a central user, even if a local
  user account does not exist yet. This can be used by extensions to look
  up information about the central user.
* (T251790) A Jest-based test suite has been introduced for testing front-end
  code such as Vue components. Tests can be run via `npm run jest`, and test
  files live in `tests/jest/`. See https://www.mediawiki.org/wiki/Jest
  for more information.
* …

=== External library changes in 1.43 ===

* The OOjs Router library has been merged into core and will be archived
  upstream.

==== New external libraries ====

* …

===== New development-only external libraries =====

* (T251790) Some development-only external libraries have been added for the new
  testing tools for front-end Vue components:
 * Added jest and jest-environment-jsdom at v29.7.0.
 * Added @vue/test-utils v2.4.6.
 * Added @vue/vue3-jest v29.2.6.
 * Added @babel/preset-env v7.25.4.
 * Codex, already available via ResourceLoader, now has the npm versions, i.e.
   @wikimedia/codex and @wikimedia/codex-icons, also installed for this testing.
* …

==== Changed external libraries ====

* Updated codex, codex-design-tokens and codex-icons
  from v1.3.6 to v1.13.0.
* Updated composer/semver from 3.4.0 to 3.4.2.
* Updated guzzlehttp/guzzle from 7.7.1 to 7.8.1.
* Updated jquery.i18n from 1.0.7 to 1.0.10.
* Updated pear/net_smtp from 1.11.1 to 1.12.1.
* Updated monolog/monolog from 2.9.2 to 2.9.3.
* Updated symfony/yaml from 5.4.35 to 5.4.39.
* Updated OOUI from v0.49.1 to v0.51.1.
* Updated wikimedia/json-codec from 3.0.1 to 3.0.2.
* Updated wikimedia/less.php from 4.2.1 to 5.1.1.
* Updated wikimedia/minify from 2.7.0 to 2.8.0.
* Updated vue from 3.3.9 to 3.4.27.
* Updated symfony/polyfill-php80 from 1.29.0 to 1.30.0.
* Updated symfony/polyfill-php81 from 1.29.0 to 1.30.0.
* Updated symfony/polyfill-php82 from 1.29.0 to 1.30.0.
* Updated symfony/polyfill-php83 from 1.29.0 to 1.30.0.
* …

===== Changed development-only external libraries =====

* Updated doctrine/dbal from 3.7.2 to 3.8.4.
* Updated eslint-config-wikimedia from 0.26.0 to 0.27.0.
* Updated mediawiki/mediawiki-codesniffer from 43.0.0 to 44.0.0.
* Updated phpunit/phpunit from 9.6.16 to 9.6.19.
* Updated seld/jsonlint from 1.10.1 to 1.10.2.
* …

==== Removed external libraries ====

* …

=== Bug fixes in 1.43 ===

* When using the 'runMaintenance' method in a LoadExtensionSchemaUpdates hook
  handler, only the script's class name is required, not its path. (T367918)
* QueryPage::recache() (used by the updateSpecialPages.php maintenance script)
  no longer attempts to ignore database errors. (T278543)
* …

=== Action API changes in 1.43 ===

* APIQueryUserInfo now returns null in the field registrationdate for users
  created before December 2005 (their registration date was not recorded).
* …

=== Action API internal changes in 1.43 ===

* …

=== Languages updated in 1.43 ===
MediaWiki supports over 350 languages. Many localisations are updated regularly.
Below only new and removed languages are listed, as well as changes to languages
because of Phabricator reports.

* (T357853) Added unidirectional script conversion for Meitei to Bengali script.
* (T367377) Updated the autonym for Tai Nuea (tdd)
* (T354937, T362041) Added language support for Minnan (Traditional Han script)
  (nan-hant).
* (T290657) Added language support for Levantine Arabic (apc).
* (T364291) Added language support for Musi, also known as Palembang (mui).
* (T364737) Added language support for Haryanvi (bgc).
* (T365365) Added language support for Chakma (ccp).
* (T367991) Added language support for Iban (iba).
* (T367688) Added language support for Interslavic (Latin) (isv-latn).
* (T370123) Added language support for Nupe (nup).
* (T371051) Added language support for Saint Lucian Creole (acf).
* (T354937, T370987) Added language support for Minnan (Pe̍h-ōe-jī)
  (nan-latn-pehoeji).
* (T354937, T369899) Added language support for Minnan (Tâi-lô)
  (nan-latn-tailo).
* (T375052) Added language support for Tigre (tig).
* …

=== Breaking changes in 1.43 ===

* ErrorPageError public properties 'msg' and 'title' may now contain
  any MessageSpecifier object, not just Message.
* Reset button functionality suppressReset() and $mShowReset from HTMLForm
  was removed without replacement.
* UserGroupMembership::getGroupName(), deprecated in 1.38, and
  UserGroupMembership::getGroupMemberName(), deprecated in 1.40, have
  been removed.
* SerializedValueContainer::isUnified(), deprecated in 1.42, has been
  removed.
* Parser::getFreshParser(), deprecated in 1.39, has been removed.
* ConfigFactory::getDefaultInstance(), deprecated since 1.27, has been
  removed.
* wfGetLangObj(), deprecated since 1.41, has been removed in favor of
  LanguageFactory::getLanguage().
* wfRemoveDotSegments(), deprecated in 1.39, has been removed.
* IReadableDatabase::getReplicaPos() has been removed without deprecation
  as it's not used anywhere.
* ILoadBalancer::laggedReplicaUsed() has been moved to ILoadBalancerForOwner::
  effectively making it internal.
* Define DB_MASTER, deprecated since 1.36, has been removed.
* ILoadBalancer::DB_MASTER, deprecated since 1.36, has been removed.
* Overriding MWException::getHTML(), ::getText(), ::getPageTitle(), and
  ::reportHTML() in order to display custom exception messages is no
  longer supported.
* In PageHandlerTestTrait, the newRouter() method was renamed to
  newRouterForPageHandler() to avoid a conflict with a method of the same
  name in RestTestTrait. Also, PageHandlerTestTrait is no longer marked as
  "stable to use". It was marked this way by accident, the functionality it
  provides is specific to certain handlers implemented in MediaWiki core.
* MediaWikiIntegrationTestCase::addCoreDBData(), deprecated since 1.41, has
  been removed.
* wfUnpack(), deprecated since 1.42, has been removed in favor of
  StringUtils::unpack().
* UIDGenerator, deprecated since 1.35, has been removed.
* TablePager::getBody(), final and deprecated since 1.24, has been removed.
  Use ::getBodyOutput() or ::getFullOutput() instead.
* ImportableUploadRevisionImporter::downloadSource(), deprecated in 1.31, is now
  private. Its only known external caller was removed in 1.40.
* The following methods in the User class have been removed:
  * Deprecated in 1.33:
    * User::isBlockedFrom()
  * Deprecated in 1.34:
    * User::isBlocked()
  * Deprecated in 1.35:
    * User::addGroup()
    * User::getAllGroups()
    * User::getGroups()
    * User::getGroupMemberships()
    * User::getImplicitGroups()
    * User::getOption()
    * User::removeGroup()
  * Deprecated in 1.37:
    * User::isBlockedFromCreateAccount()
* BotPassword::invalidateAllPasswordsForCentralId() and
  BotPassword::removeAllPasswordsForCentralId(), deprecated in 1.37,
  have been removed.
* Title::getBrokenLinksFrom(), deprecated in 1.42, has been removed.
* The $type parameter to Skin::getCopyright(), deprecated in 1.40, has been
  removed.
* The module `mediawiki.icon`, deprecated in 1.42, has been removed.
* The `@vue/composition-api` module, a deprecated alias for `vue` since 1.41,
  has been removed. Use `vue` directly.
* SiteConfiguration::extractVar() and ::extractGlobal(), deprecated in 1.41,
  have been removed.
* Skin::footerLink(), deprecated in 1.40, has been removed.
* Skin::getAction(), deprecated in 1.39, has been removed.
* Title::getCdnUrls() and Title::purgeSquid(), deprecated in 1.35, have been
  removed.
* The `mediawiki.pager.tablePager` module, deprecated in 1.38, has been
  removed in favor of the more generic `mediawiki.pager.styles`.
* BagOStuff::setNewPreparedValues(), deprecated in 1.40, has been removed.
* Constructing MWHttpRequest objects now requires timeout and connectTimeout to
  be set; this was deprecated in 1.35.
* Hooks that were run from SpecialContributions are now run from the parent,
  ContributionsSpecialPage. The page passed in is a ContributionsSpecialPage
  type, and documentation and type comparisons may need to be updated. Affected
  hooks are: ContributionsBeforeMainOutputHook, ContributionsToolLinksHook,
  SpecialContributions__getForm__filtersHook.
* Hooks that were run from ContribsPager are now run from the parent,
  ContributionsPager. If a pager is passed in, it is a ContributionsPager type,
  and documentation and type comparisons may need to be updated. Affected
  hooks are: ContribsPager__reallyDoQueryHook, ContribsPager__getQueryInfoHook,
  ContributionsLineEndingHook, SpecialContributions__formatRow__flagsHook.
* Hooks that were run from DeletedContribsPager are now run from the parent,
  ContributionsPager. If a pager is passed in, it is a ContributionsPager type,
  and documentation and type comparisons may need to be updated. Affected
  hooks are: DeletedContribsPager__reallyDoQueryHook and
  DeletedContributionsLineEndingHook.
* The public method ContributionsSpecialPage::getUserLinks has been made
  protected. Although not marked @internal, the method was public to be called
  from SpecialDeletedContributions (call now removed), and was not called from
  anywhere else.
* DatabaseBlock::purgeExpired, deprecated since 1.38, has been removed.
* AbstractBlock::getPermissionsError, deprecated since 1.35, has been removed.
* IDatabase::namedLocksEnqueue() has been removed without deprecation.
* IDatabase::getTopologyRole() has been removed without deprecation.
* IDatabase::getTopologyBasedServerId() has been removed without deprecation.
  Use IDatabase::getServerName() instead.
* IReadableDatabase::wasReadOnlyError() has been removed without deprecation.
  Use IDatabase::isReadOnly() instead.
* IReadableDatabase::wasDeadlock() has been removed without deprecation.
* ILoadBalancer::getWriterIndex() has been removed without deprecation.
  Use ServerInfo::WRITER_INDEX constant instead.
* MaintainableDBConnRef, deprecated since 1.39, has been removed.
* ILoadBalancer::reuseConnection(), deprecated since 1.39, has been removed.
* WikiPage::doDeleteArticleBatched, hard deprecated since 1.37, has been
  removed.
* SpecialEmailUser::submit, deprecated since 1.41, has been removed.
* SpecialEmailUser::validateTarget, deprecated since 1.41, has been removed.
* SpecialEmailUser::getPermissionsError, deprecated since 1.41 has been
  removed.
* SpecialBlock::getTargetAndType, deprecated since 1.36, has been removed.
* ApiQueryBlockInfoTrait::addBlockInfoToQuery(), deprecated since 1.42, has been
  removed.
* Linker::makeExternalLink() has been deprecated in favor of
  LinkRenderer::makeExternalLink(), which has a improved API to help phan's
  SecurityCheckPlugin provide more accurate checks for escaping issues.
* Linker::makeHeadline(), Linker::generateTOC(), Linker::tocIndent(),
  Linker::tocUnindent(), Linker::tocLine(), Linker::tocLineEnd(), and
  Linker::tocList(), deprecated in 1.42, have been removed.
* Linker::formatComment(), Linker::formatLinksInComment(),
  Linker::commentBlock(), and Linker::revComment(), deprecated in 1.38,
  have been removed.
* UserCache::singleton(), deprecated in 1.43, now emits deprecation warnings.
  Use MediaWikiServices::getInstance()->getUserCache() instead.
* DummyLinker has been removed. The former DummyLinker parameter
  to the 'ImageBeforeProduceHTML' hook is now null.
* The following methods of IDatabase have been moved to internal interface
  IDatabaseForOwner without deprecation. These methods are internal and
  shouldn't be used outside of rdbms library:
  - ::pendingWriteCallers()
  - ::flushSession()
  - ::lastDoneWrites()
  - ::setTransactionListener()
  - ::serverIsReadOnly()
  - ::getPrimaryPos()
  - ::pendingWriteQueryDuration()
  - ::writesOrCallbacksPending()
  - ::writesPending()
  - ::primaryPosWait()
* IMaintainableDatabase::listViews(), deprecated since 1.42, has been removed.
* IMaintainableDatabase::truncate(), deprecated since 1.42, has been removed.
* IMaintainableDatabase::textFieldSize() was removed without deprecation.
* ReplicatedBagOStuff, deprecated since 1.42, has been removed.
* The 'replicaOnly' option to SqlBagOStuff has been removed without deprecation.
  It existed for internal use by SqlBagOStuff only.
* Support for WinCache as local server cache has been removed, because WinCache
  is not available for supported versions of PHP. The WinCacheBagOStuff class
  has been removed. Use MediaWikiServices::getLocalServerObjectCache() instead,
  or the CACHE_ACCEL type instead, which automatically selects APCu when
  available.
  The "wincache" cache type (e.g. to ObjectCache::getInstance, and in
  "wg*CacheType" configuration) remains supported as an alias for CACHE_ACCEL.
* LockManager::sha1Base16Absolute(), has been removed without deprecation.
* The "options" parameter to User::createNew() and the $data parameter to
  UserOptionsManager::loadUserOptions() were removed.
* `.list-style-image()` mixin from mediawiki.mixins.less, deprecated since 1.38,
  has been removed.
* `.background-image()` mixin from mediawiki.mixins.less, deprecated since 1.38,
  has been removed.
* IDatabase::nextSequenceValue(), deprecated since 1.30, was removed.
* $wgAPIRequestLog was removed without deprecation. Use "api" and "api-request"
  wgDebugLogGroups channels or SPI instead.
* The setStats() method in MediaWiki\Rest\Router now expects a StatsFactory
  rather than a StatsdDataFactoryInterface. The method has been marked @internal
  and should not be called by extensions.
* All `@width-breakpoint-*` Less variables have been removed. Use
  `@min-width-breakpoint-*`/`@max-width-breakpoint-*` instead.
* The MessageContent class, deprecated since 1.38, is now removed. This also
  means that the Message::content() method is also removed.
* The following ParserOption methods, deprecated since 1.35, were removed:
  - ::setAllowExternalImages()
  - ::setAllowExternalImagesFrom()
  - ::setEnableImageWhitelist()
* Sanitizer::removeHTMLtags(), deprecated since 1.38, has been removed.
* OutputPage::getCSPNonce(), deprecated since 1.35, has been removed.
* UserMailer::rfc822Phrase(), deprecated since 1.38, has been removed.
* QueryPage::getSQL(), deprecated since 1.39, has been removed. The replacement
  QueryPage::getQueryInfo() is now abstract.
* update-keys.sql was removed. It is not recommended to install MediaWiki by
  manually sourcing SQL files, but if you are doing this, run
  `update.php --initial` instead of sourcing update-keys.sql.
* …

=== Deprecations in 1.43 ===

* The methods StatusValue::getErrors() and StatusValue::getErrorsByType(),
  as well as Status::getErrorsArray() and Status::getWarningsArray(), have
  been deprecated in favor of new method StatusValue::getMessages().
* PermissionManager::getPermissionErrors() has been deprecated in favor
  of getPermissionStatus().
* PermissionStatus::toLegacyErrorArray() is deprecated with no replacement.
* PermissionsError properties $errors and $permission are deprecated.
  To display the error, throw it or use ->report().
* (T166010) All PHP code in MediaWiki is slowly being moved to be in a class
  namespace as appropriate, so that we can use PSR-4 auto-loading, which will
  speed up general code loading of MediaWiki. The old global namespace class
  names are being left behind as deprecated aliases.

  In this release of MediaWiki, XYZ classes now have a namespace and XYZ do
  not yet (XYZ% done, up from 69% in MediaWiki 1.42.0). The following have newly
  been moved:
  - MediaWiki\Content:
    - AbstractContent
    - CodeContentHandler
    - Content
    - ContentHandler
    - ContentModelChange
    - CssContent
    - CssContentHandler
    - FallbackContent
    - FallbackContentHandler
    - FileContentHandler
    - JavaScriptContent
    - JavaScriptContentHandler
    - JsonContent
    - JsonContentHandler
    - TextContent
    - TextContentHandler
    - WikitextContent
    - WikitextContentHandler
    - WikiTextStructure
  - MediaWiki\Debug:
    - DeprecationHelper
    - MWDebug
  - MediaWiki\Deferred:
    - RefreshSecondaryDataUpdate
  - MediaWiki\FileBackend:
    - FileBackendGroup – FIXME: Should this be in Wikimedia\FileBackend instead?
  - MediaWiki\Json:
    - FormatJson
  - MediaWiki\Language:
    - Language
    - LanguageCode
    - ILanguageConverter
    - LanguageConverter
    - ConverterRule
    - ReplacementArray
  - MediaWiki\RCFeed:
    - FormattedRCFeed
    - IRCColourfulRCFeedFormatter
    - JSONRCFeedFormatter
    - MachineReadableRCFeedFormatter
    - RCFeed
    - RCFeedFormatter
    - RedisPubSubFeedEngine
    - UDPRCFeedEngine
    - XMLRCFeedFormatter
  - MediaWiki\RenameUser:
    - RenameUserJob
  - MediaWiki\Registration:
    - ExtensionDependencyError
    - ExtensionJsonValidationError
    - ExtensionJsonValidator
    - ExtensionProcessor
    - ExtensionRegistry
    - MissingExtensionException
    - Processor
    - VersionChecker
  - MediaWiki\RevisionList:
    - RevisionItem
    - RevisionItemBase
    - RevisionList
    - RevisionListBase
  - MediaWiki\Watchlist:
    - ActivityUpdateJob
    - ClearUserWatchlistJob
    - ClearWatchlistNotificationsJob
    - NoWriteWatchedItemStore
    - WatchedItem
    - WatchedItemQueryService
    - WatchedItemQueryServiceExtension
    - WatchedItemStore
    - WatchedItemStoreInterface
    - WatchlistExpiryJob
  - MediaWiki\Xml:
    - Xml
    - XmlSelect
  - Wikimedia\FileBackend:
    - FileBackend
  - Wikimedia\Http:
    - MultiHttpClient
  - Wikimedia\Message:
    - MessageSpecifier
  - Wikimedia\ObjectCache:
    - APCUBagOStuff
    - BagOStuff
    - CachedBagOStuff
    - EmptyBagOStuff
    - HashBagOStuff
    - IStoreKeyEncoder
    - MediumSpecificBagOStuff
    - MemcachedBagOStuff
    - MemcachedPeclBagOStuff
    - MemcachedPhpBagOStuff
    - MultiWriteBagOStuff
    - RESTBagOStuff
    - RedisBagOStuff
    - WinCacheBagOStuff
* MessageCache::get() with $language other than Language or null is
  deprecated and emits deprecation warnings. For high-level access,
  use wfMessage() or RequestContext::msg() instead.
* Manually constructing a Language object, deprecated in 1.35, now emits
  deprecation warnings. Use LanguageFactory instead.
* MediaWiki\Languages\Data\Names::$names is deprecated.
* SearchEngineConfig::getConfig() has been deprecated, use DI with
  ServiceOptions to inject the required options.
* ObjectCache::isDatabaseId() and ::getLocalClusterInstance() have been
  deprecated. Use their equivalents in ObjectCacheFactory.
* Using the "post" source in parameter declarations returned from
  Handler::getParamSettings() is deprecated, use "body" instead.
* ISQLPlatform::tableNamesN() is now deprecated.
* The implementation in SQLPlatform of ISQLPlatform::tableNames(), deprecated in
  MediaWiki 1.39, now emits deprecation warnings.
* Title::getTitleProtection(), deprecated in 1.37, now emits warnings. You can
  use RestrictionStore::getCreateProtection() instead.
* Title::loadRestrictions(), deprecated in 1.37, now emits warnings.
* Title::flushRestrictions(), deprecated in 1.37, now emits warnings.
* Title::getPageViewLanguage(), deprecated in 1.42, now emits warnings.
* wfUrlProtocols(), deprecated in 1.39, now emits warnings.
* wfGetServerUrl(), deprecated in 1.39, now emits warnings.
* wfExpandIRI(), deprecated in 1.39, now emits warnings.
* The following methods, previously deprecated, now emit deprecation warnings:
  - ContentHandler::getDefaultModelFor(), deprecated since 1.33
  - ContentHandler::getAllContentFormats(), deprecated since 1.35
  - ContentHandler::getContentModels(), deprecated since 1.35
  - ContentHandler::getForContent(), deprecated since 1.35
  - ContentHandler::getForModelID(), deprecated since 1.35
  - ContentHandler::getContentText(), deprecated since 1.37
* Passing a Message argument to OutputPage::setPageTitle(), which was
  deprecated in 1.41, now emits warnings.
* OutputPage::showFatalError() is deprecated, use showErrorPage() instead.
* OutputPage::showPermissionsErrorPage() is deprecated,
  use showPermissionStatus() instead.
* OutputPage::formatPermissionsErrorMessage(), deprecated since 1.36,
  now emits deprecation warnings. Use formatPermissionStatus() instead.
* OutputPage::setCategoryLinks() has been deprecated and emits deprecation
  warnings.  Use ::addCategoryLinks() instead.
* LoadBalancer::getConnectionRef(), deprecated since 1.39, now emits deprecation
  warnings. Use ::getConnection() instead.
* DBAccessObjectUtils::getDBOptions() is deprecated, use
  SelectQueryBuilder::recency() instead.
* IDatabase::lockForUpdate is deprecated, use
  SelectQueryBuilder::acquireRowLocks instead.
* wfGetUrlUtils() is deprecated; instead, get a UrlUtils from services.
* DerivedPageDataUpdater::getPreparedEdit(), provided for back-compatibility, is
  now deprecated; use the getters directly, instead.
* AuthManager::forcePrimaryAuthenticationProviders(), provided for back-
  compatibility, is now deprecated.
* WikiPage::hasDifferencesOutsideMainSlot(), provided as a stop-gap before
  refactoring to support MCR, is now deprecated.
* ChangesList::getTimestamp() has been deprecated; use ::revDateLink() instead.
* RecentChange::doMarkPatrolled() is deprecated, use
  RecentChange::markPatrolled() instead.
* LogFormatter::newFromRow() and LogFormatter::newFromEntry(), deprecated since
  1.42, now emit deprecation warnings.
* LinksUpdate::getAddedLinks(), ::getRemovedLinks(), deprecated since 1.38, now
  emit deprecation warnings.
* TitleLinksTable::getTitleArray(), deprecated since 1.38, now emits deprecation
  warnings.
* SiteConfig::variants() has been deprecated; use ::variantsFor().
* ObjectCache::$instances and ::getInstance() have been deprecated; instead, use
  ObjectCacheFactory::getInstance().
* WANObjectCache::clearLastError() and BagOStuff::clearLastError have been hard
  deprecated, use ::watchErrors() together with ::getLastErrors() instead.
* BagOStuff::getSegmentationSize() and ::getSegmentedValueMaxSize() no longer
  have any usage. The subclass' method in MediumSpecificBagOStuff overrides also
  have no usage as well.
* ApiBase::errorArrayToStatus() is deprecated with no replacement.
* ApiTestCase::setExpectedApiException() has been deprecated; instead, use
  ::expectApiErrorCode() to test error codes instead of messages.
* ApiPageSet::getTitles(), ApiPageSet::getGoodTitles(),
  ApiPageSet::getMissingTitles(), ApiPageSet::getGoodAndMissingTitles(),
  ApiPageSet::getRedirectTitles() and ApiPageSet::getSpecialTitles, deprecated
  since 1.37, now emit deprecation warnings.
* QueryPage::setDBLoadBalancer() and ::getDBLoadBalancer() have been deprecated,
  use QueryPage::setDatabaseProvider() or ::getDatabaseProvider() instead.
* User::isBlockedGlobally(), deprecated since 1.40, now emits deprecation
  warnings.
* User::isBlockedFromEmailuser() and User::canSendEmail(), deprecated since
  1.41, now emit deprecation warnings.
* wfMergeErrorArrays() has been deprecated.
* User::whoIs() and User::whoIsReal(), have been deprecated.
* UserCache class and MediaWikiServices::getUserCache(), have been deprecated.
* JsonUnserializable and related classes have been renamed to JsonDeserializable
  to make it clearer that they're related to converting serialized content back
  into JSON, rather than stating that things are not representable in JSON. The
  previous class names have been left behind as deprecated aliases:
   - JsonUnserializable -> JsonDeserializable
   - JsonUnserializableTrait -> JsonDeserializableTrait
   - JsonUnserializer -> JsonDeserializer
  Additionally, JsonCodec's unserialize() and unserializeArray() methods have
  also been renamed to deserialize() and deserializeArray(), with the old names
  deprecated.
* In the REST framework, the the BodyValidator interface and all functionality
  related to it are deprecated. They have been replaced by
  Handler::getBodyParamSettings() and Handler::parseBodyData(). The following
  interfaces, classes, and methods are affected:
  - interface BodyValidator
  - class JsonBodyValidator
  - class NullValidator
  - function Handler::getBodyValidator
  - function Validator::validateBody
* StatusValue will emit deprecation warnings when an error is given as
  a MessageSpecifier combined with a parameters array, which is usually
  a mistake, as the parameters have always been ignored.
* In StatusValue::replaceMessage(), ::hasMessage() and ::hasMessagesExcept()
  passing MessageSpecifier or MessageValue as $source has been deprecated.
* PageArchive::undeleteAsUser, deprecated since 1.35, now emits deprecation
  warnings.
* DatabaseBlock::getQueryInfo() and DatabaseBlock::getRangeCond() are
  deprecated and emit deprecation warnings. Use the equivalent methods in
  DatabaseBlockStore.
* DatabaseBlockStore::getReadStage() and ::getWriteStage() are deprecated.
  Use the new schema unconditionally.
* UserOptionsManager::resetOptions(), ::listOptionKinds and ::getOptionKinds are
  deprecated and will emit deprecation warnings. Use the corresponding methods
  in PreferencesFactory and UserOptionsManager::resetOptionsByName().
* The `i18n-all-lists-margins` and `interface-message-box` module of SkinModule
  are deprecated. The former has been merged into the `elements` module, the
  latter has no required replacement. See JavaScript console for instructions.
* ParsoidOutputAccess and all of its methods have been deprecated.  Use
  ParserOutputAccess with ParserOptions::setUseParsoid() instead.
* ParserOutput::addJsConfigVars(), deprecated since 1.38, now emits deprecation
  warnings. Use ParserOutput::setJsConfigVar() instead.
* To support a future change allowing serializing of MessageValue objects
  as JSON, the methods MessageValue::objectParams(), Message::objectParams()
  and Message::objectParam() are deprecated. The UserGroupMembershipParam
  class and the ParamType::OBJECT constant are likewise deprecated.
* The Less mixin .column-break-after-avoid() is deprecated. Use just the
  CSS rule `break-after: avoid-column;` instead now.
* The following method are deprecated; instead call the appropriate
  constructor method in PageRestHelperFactory with the appropriate
  initialization arguments:
  * HtmlOutputRendererHelper::init()
  * HtmlMessageOutputHelper::init()
  * HtmlInputTransformHelper::init()
  Similarly, calling the constructor method in PageRestHelperFactory
  without the appropriate initialization arguments is now deprecated.
* HTMLForm methods getPreText, setPreText, addPreText, getPostText,
  setPostText, addPostText, getHeaderText, setHeaderText, addHeaderText,
  getFooterText, setFooterText and addFooterText, deprecated since 1.38, now
  emit deprecation warnings.
* FormSpecialPage methods preText and postText, deprecated since 1.38, now
  emit deprecation warnings.
* EditPage::internalAttemptSave() is deprecated as part of cleaning up how
  edits are saved, see T157658 for details.
* The MessageCache::get hook, deprecated since 1.41, now emits deprecation
  warnings.
* Twelve deprecated properties of OutputPage now will emit warnings; their
  relevant getters or setters should be used instead:
  * mCategoryLinks       - getCategoryLinks() and setCategoryLinks()
  * mCategories          - getCategories()
  * mIndicators          - getIndicators() and setIndicators()
  * mHeadItems           - getHeadItemsArray(), hasHeadItem(), addHeadItem(),
                           and addHeadItems()
  * mModules             - getModules() and addModules()
  * mModuleStyles        - getModuleStyles() and addModuleStyles()
  * mJsConfigVars        - getJsConfigVars() and addJsConfigVars()
  * mTemplateIds         - getTemplateIds()
  - mEnableClientCache   - Set with enableClientCache() and disableClientCache()
  - mNewSectionLink      - Get with showNewSectionLink()
  - mHideNewSectionLink  - Set with forceHideNewSectionLink()
  - mNoGallery           - getNoGallery()
* mw.cookie.getCrossSite() has been deprecated due to the removal of
  $wgUseSameSiteLegacyCookies in MW 1.42. Use mw.cookie.get().
* The 'help' key in HTMLForm descriptors is deprecated. Use the 'help-raw'
  key instead.
* ImageGalleryBase::setWidths() and ::setHeights() will now emit a deprecation
  warning if they are called without ImageGalleryBase::setParser() having been
  called.  Please set the parser appropriately when using the image gallery.
* The hook OutputPageMakeCategoryLinks is deprecated. Use the new hook
  OutputPageRenderCategoryLink instead.
* …

=== Other changes in 1.43 ===

* Class aliases to support the old PHPUnit 4 style un-namespaced `PHPUnit_`
  classes (such as PHPUnit_Framework_Error) have been removed.
* [Temporary accounts] If $wgAutoCreateTempUser is enabled, then MediaWiki
  will create a temporary account and log the user in for unsuccessful edit
  attempts and null edits, in addition to edits that change content. This is
  a change from the previous paradigm, where temporary accounts were created
  only for successful edits. This change is done to support better logging
  support and moderation, to ensure that hooks run in a pre-save context have
  a user object to associate log entries and other actions with.
* Several entries have been removed from the default list of interwikis used
  when installing new wikis. This does not affect existing wikis.
* User auto-creations are now performed as the target user instead of
  anonymous IP user.
* [Temporary accounts] T359043 Temporary accounts for anonymous edits are
  enabled in DevelopmentSettings.php. To disable the feature, set
  `$wgAutoCreateTempUser['enabled'] = false;` in LocalSettings.php
* Corrected the interpretation of empty arrays in extension configuration when
  the default value is null. Previously, an empty array specified by the
  administrator would transform into the default null value. It now
  appropriately retains its empty array state.
* (T362536) Exempted "deletedhistory", "deletedtext", and "viewsuppressed"
  rights from namespace protection ($wgNamespaceProtection) since that's
  only meant to prevent write actions.
* Image captions are no longer trimmed.
* 'SpecialPasswordResetOnSubmit' hook handlers can now receive both the
  username and the email provided by the user, instead of only one of them.
* …

== Compatibility ==

MediaWiki 1.43 requires PHP 8.1.0 or later and the following PHP extensions:

* ctype
* dom
* fileinfo
* iconv
* intl
* json
* mbstring
* openssl
* xml

MariaDB is the recommended database software. MySQL, PostgreSQL, or SQLite can
be used instead, but support for them is somewhat less mature.

The supported versions are:

* MariaDB 10.3 or higher
* MySQL 5.7.0 or higher
* PostgreSQL 10 or later
* SQLite 3.8.0 or later

== Online documentation ==
Documentation for both end-users and site administrators is available on
MediaWiki.org, and is covered under the GNU Free Documentation License (except
for pages that explicitly state that their contents are in the public domain):

  <https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation>

== Mailing list ==
A mailing list is available for MediaWiki user support and discussion:

  <https://lists.wikimedia.org/postorius/lists/mediawiki-l.lists.wikimedia.org/>

A low-traffic announcements-only list is also available:

  <https://lists.wikimedia.org/postorius/lists/mediawiki-announce.lists.wikimedia.org/>

It's highly recommended that you sign up for one of these lists if you're
going to run a public MediaWiki, so you can be notified of security fixes.

== IRC help ==
There's usually someone online in #mediawiki on irc.libera.chat.