wiki.techinc.nl/RELEASE-NOTES-1.37

= MediaWiki 1.37 =

== MediaWiki 1.37.0-PRERELEASE ==

THIS IS NOT A RELEASE YET

MediaWiki 1.37 is an alpha-quality development branch, and is not recommended
for use in production.

== Upgrading notes for 1.37 ==
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 1.27.

Some specific notes for MediaWiki 1.37 upgrades are below:
* …

For notes on 1.36.x and older releases, see HISTORY.

=== Configuration changes for system administrators in 1.37 ===
* …

==== New configuration ====
* $wgBrowserFormatDetection - This setting allows the enabling or disabling
of automatic detection of possible phone numbers in a webpage in Safari on iOS.
* …

==== Changed configuration ====
* $wgContentHandlerTextFallback - This setting, which defines how to
  react if a plain text version of a non-text Content object is
  requested using ContentHandler::getContentText(), is deprecated.
* $wgActions was reworked to support injecting dependencies into
  Action subclasses. Previously, $wgActions was an array where the
  keys were the names of actions, and the values had the following
  impacts (for a given key 'Foo')
  - `true`: use the class 'FooAction' unless for a specific page
      WikiPage::getActionOverrides() wants to override that action
  - a string: use the class with that name, and do not allow overriding
      on a per-page basis
  - `false`: the action is disabled
  - a callable: use the Action instance returned by invoking that
      callback, and do not allow overriding on a per-page basis
  - an object: use that specific Action instance, and do not allow
      overriding on a per-page basis.
  As part of T253078, values can now be arrays that are not callables,
  which are treated as ObjectFactory specs, allowing for services to
  be injected. Additionally, the distinction between values that allow
  per-page overrides and those that do not was removed - all actions
  can now be overridden on a per-page basis using
  WikiPage::getActionOverrides().
* $wgShellboxUrl is deprecated, use $wgShellboxUrls as a mapping of
  service => URL instead.
* $wgIncludejQueryMigrate Default value for this configuration has changed
  from true to false. This may break gadgets that depended on methods removed
  in jQuery 3. See T280944 for more information.
* …

==== Removed configuration ====
* $wgLegacyJavaScriptGlobals, deprecated in 1.36.
* $wgShowDBErrorBacktrace, deprecated and non-functional since 1.32.
* $wgShowSQLErrors, deprecated and non-functional since 1.32.
* $wgLangObjCacheSize - The LanguageFactory service now always retains
  at most 10 objects in its LRU-cache.

=== New user-facing features in 1.37 ===
* (T161934) MediaWiki now supports JPEG2000 files, to a limited extent.
* Media files uploaded server side using the importImages.php maintenance
  script now have the "mw-server-side-upload" change tag.
* …

=== New developer features in 1.37 ===
* …

=== External library changes in 1.37 ===
* …

==== New external libraries ====
* Added whatwg-fetch 3.6.2.
* Added wikimedia/normalized-exception 1.0.1.
* …

===== New development-only external libraries =====
* …

==== Changed external libraries ====
* Updated OOjs from v5.0.0 to v6.0.0
* Updated OOUI from v0.41.3 to v0.42.0
* Updated WVUI from v0.1.0 to v0.3.0
* Updated cssjanus/cssjanus from v1.3.0 to v2.0.0.
* Updated psr/container from v1.0.0 to v1.1.1.
* Updated wikimedia/minify from v2.2.2 to v2.2.4.
* Updated wikimedia/object-factory from v3.0.0 to v3.0.2.
* Updated wikimedia/parsoid from v0.13.0-a20 to v0.14.0-a1.
* Updated wikimedia/relpath from v2.1.1 to v3.0.0.
* Updated wikimedia/remex-html from v2.3.1 to v2.3.2.
* Updated wikimedia/shellbox from v1.0.4 to v2.0.0.
* Updated wikimedia/wait-condition-loop from v2.0.1 to v2.0.2.
* …

===== Changed development-only external libraries =====
* Updated qunit from 2.10.0 to 2.16.0.
* …

==== Removed external libraries ====
* The pimple/pimple development-only library has been removed.
* …

=== Bug fixes in 1.37 ===
* …

=== Action API changes in 1.37 ===
* …

=== Action API internal changes in 1.37 ===
* …

=== Languages updated in 1.37 ===
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.

* (T280435) LRM and RLM characters were removed from names of languages with
  parentheses in Names.php
* (T283422) Add namespace name translations and change the autonym of
  the Kinyarwanda language to "Ikinyarwanda".
* (T283423) Change the autonym of the Lombard language from "lumbaart"
  to "lombard".
* (T279619) Added language support for Dagbani (dag).
* (T282085) Added language support for Malay in Arabic (Jawi) script (ms-arab).
* (T283053) Added language support for Ojibwe (ojb).
* (T283480) Added language support for Wallisian (wls, Fakaʻuvea).
* (T284002) Added language support for Paiwan (pwn).
* (T284044) Added language support for Carpathian Romani (rmc).
* (T286460) Added language support for Gun (guw, Gungbe).
* (T287345) Added language support for Baoulé (bci).
* (T25216) Started the renaming of the language code for Norman from nrm to
  nrf.

=== Breaking changes in 1.37 ===
* The Revision class, hard deprecated in 1.35, was removed entirely. As
  part of this, the following hooks that included a Revision object
  were removed:
  - ArticleRevisionUndeleted - use RevisionUndeleted
  - ArticleRollbackComplete - use RollbackComplete
  - DiffRevisionTools - use DiffTools
  - DiffViewHeader - use DifferenceEngineViewHeader
  - HistoryRevisionTools - use HistoryTools
  - NewRevisionFromEditComplete - use RevisionFromEditComplete
  - PageContentInsertComplete - use PageSaveComplete
  - PageContentSaveComplete - use PageSaveComplete
  - ParserFetchTemplate - use BeforeParserFetchTemplateRevisionRecord
  - RevisionInsertComplete - use RevisionRecordInserted
  - TitleMoveComplete - use PageMoveComplete
  - TitleMoveCompleting - use PageMoveCompleting
  - UndeleteShowRevision - no replacement
  - UserRetrieveNewTalks - no replacement
  and the following methods and variables have been removed
  - Article::$mRevision
  - Article::getRevisionFetched()
  - ContribsPager::tryToCreateValidRevision()
  - EditPage::$mBaseRevision
  - EditPage::getBaseRevision()
  - LinksUpdate::getRevision()
  - LinksUpdate::setRevision()
  - PageArchive::getArchivedRevision()
  - PageArchive::getPreviousRevision()
  - PageArchive::getRevision()
  - Parser::$mRevisionObject
  - Parser::fetchCurrentRevisionOfTitle()
  - Parser::getRevisionObject()
  - Parser::statelessFetchRevision()
  - ParserOptions::getCurrentRevisionCallback()
  - ParserOptions::setCurrentRevisionCallback()
  - Title::countAuthorsBetween()
  - Title::getFirstRevision()
  - User::getNewMessageLinks()
  - User::getNewMessageRevisionId()
  - User::setNewtalk()
  - WikiPage::getOldestRevision()
  - WikiPage::getRevision()
  - WikiPage::getUndoContent()
  - WikiPage::updateIfNewerOn()
  and the following methods no longer accept Revision objects as parameters:
  - CategoryMembershipChange::__construct()
  - ContentHandler::getUndoContent()
  - DerivedPageDataUpdater::prepareUpdate()
  - DifferenceEngine::getRevisionHeader()
  - Linker::buildRollbackLink()
  - Linker::generateRollback()
  - Linker::getRevDeleteLink()
  - Linker::getRollbackEditCount()
  - Linker::revComment()
  - Linker::revUserLink()
  - Linker::revUserTools()
  - WikiPage::doDeleteUpdates()
  - WikiPage::doEditUpdates()
  - WikiPage::hasDifferencesOutsideMainSlot()
  - WikiPage::onArticleEdit()
  - WikiPage::prepareContentForEdit()
  - WikiPage::updateRevisionOn()
  The following methods return arrays that formerly included a 'revision'
  key that would emit deprecation warnings when accessed and return a
  Revision object. The Revision object has been removed from the arrays,
  and the 'revision-record' key should be used to get the relevant
  RevisionRecord instead:
  - PageUpdater::doCreate()
  - PageUpdater::doModify()
  - Parser::statelessFetchTemplate()
  - WikiPage::doEditContent()
  The ParserOptions `templateCallback` option is a callback that is called
  in Parser::fetchTemplateAndTitle() and should return an array - the
  'revision' key to that array used to be a Revision object and was used if
  no 'revision-record' was returned - it is now ignored.
* Previously, the classes RevisionTestModifyableContent and
  RevisionTestModifyableContentHandler were loaded for use in tests, but
  were only used within the tests for the since-removed Revision class. This
  content and content handler class were removed without deprecation.
* WANObjectCache::HOLDOFF_NONE, deprecated since 1.35, was removed.
  Use HOLDOFF_TTL_NONE instead.
* ResourceLoader::makeVersionQuery without $modules parameter, deprecated
  since 1.34, is no longer supported.
* LocalFile::recordUpload2(), deprecated since 1.35, was removed.
* The following methods and fields in the Language class, deprecated since
  1.35, have been removed:
   - classFromCode()
   - clearCaches()
   - convertTitle()
   - findVariantLink()
   - mConverter
   - updateConversionTable()
* The following methods in the Parser class have been removed after having
  been deprecated in 1.35:
   - fetchTemplate()
   - Title()
* (T273354) When an edit is prevented by an 'EditFilterMergedContent' hook
  handler without changing the status, the edit form will now be displayed.
* User::clearNotification() which had been deprecated in 1.35 has been removed.
  Use WatchlistManager::clearTitleUserNotification() instead.
* User::getNewtalk() which had been deprecated in 1.35 has been removed. Use
  TalkPageNotificationManager::userHasNewMessages() instead.
* Autopromote class, deprecated since 1.35, was removed. Use
  UserGroupManager instead.
* The following classes, hard-deprecated since 1.36, have been removed:
  CachedAction, SpecialCachedPage, CacheHelper, ICacheHelper.
* The hooks BeforeHttpsRedirect, CanIPUseHTTPS and UserRequiresHTTPS, deprecated
  in 1.35, were removed.
* The TitleArrayFromResult hook, deprecated in 1.36, was removed.
* The deprecated "es6-promise" alias ResourceLoader module has been removed. Use
  "es6-polyfills" directly intead.
* The deprecated "mediawiki.legacy.protect" ResourceLoader module, deprecated
  since 1.36, has been removed. Use "mediawiki.action.protect" instead.
* AuthenticationProvider interface doesn't extend LoggerAwareInterface.
  So AuthenticationProvider can't be typehinted as LoggerAwareInterface.
* User::getGrantName(), hard deprecated since 1.36, has been removed.
  Use MWGrants::grantName instead.
* SessionProvider class doesn't extend LoggerAwareInterface.
  So SessionProvider can't be typehinted as LoggerAwareInterface.
* The following ApiBase methods, deprecated since 1.35, have been removed:
  - ApiBase::explodeMultiValue
  - ApiBase::parseMultiValue
  - ApiBase::validateLimit
  - ApiBase::validateTimestamp
* User::idCacheByName public static field was removed without deprecation.
  instead of using it, get a UserIdentity by name from UserIdentityLookup.
* IDatabase::upsert() and IDatabase::replace() only accept a single unique key.
  Previously, a warning was issued if there were multiple unique keys provided.
* The MediaWiki:Autoblock_whitelist block exemption control was moved in 1.36 to
  MediaWiki:Block-autoblock-exemptionlist. The backward-compatibility of reading
  the old MediaWiki:Autoblock_whitelist page has now been dropped.
* The following overridable methods in File hierarchy has changed signatures:
  - File::deleteFile - now accepts UserIdentity instead of User
  - File::getDescription - now accepts Authority instead of User
  - File::userCan - now accepts Authority instead of User
  - LocalFile::deleteOldFile - now accepts UserIdentity instead of User
* The following global methods, each deprecated since 1.36, have been removed:
  - wfAppendToArrayIfNotDefault
  - wfAcceptToPrefs
  - wfConfiguredReadOnlyReason
  - wfDebugMem
  - wfGetPrecompiledData
  - wfNegotiateType
* The following deprecated methods of Title class have been removed:
  - nameOf, deprecated in 1.36
  - getPreviousRevisionID, deprecated in 1.34
  - getNextRevisionID, deprecated in 1.34
  - getEarliestRevTime, deprecated in 1.35
* UploadBase::stashFile, deprecated since 1.28, was removed.
* wfGetRusage(), deprecated since 1.35, has been removed.
* The following CLI options were removed from tests/phpunit.php:
  - use-filebackend
  - use-jobqueue
  - use-bagostuff
  The following options (inherited from Maintenance) were also removed:
  - conf
  - dbuser
  - dbpass
  - dbdefaultgroup
  - globals
  - memory-limit
  - profiler
  - server
  The following options were changed to environment variables:
  - wiki => PHPUNIT_WIKI
  - use-normal-tables => PHPUNIT_USE_NORMAL_TABLES
  - use-filebackend => PHPUNIT_USE_FILEBACKEND
  - use-bagostuff => PHPUNIT_USE_BAGOSTUFF
  - use-jobqueue => PHPUNIT_USE_JOBQUEUE
  This is so that we can use the default PHPUnit entry point (T90875).
* The PHPUNIT_REUSE_DB / --reuse-db option was removed from the phpunit.php
  runner. It had been broken for at least three years already. The original use
  case was speeding up tests on Oracle, but Oracle support was dropped several
  releases ago.
* The MediaWikiPHPUnitTest__endTestHook and MediaWikiPHPUnitTest__startTestHook
  PHPUnit hooks were removed. MediaWikiHooksPHPUnitExtension was also removed.
* EntryPoint::getTextFormatters() was made private without a deprecation period;
  it had no known external callers.
* DatabaseBlock::chooseBlock, deprecated since 1.35, was removed.
* SpecialPageFactory::getRestrictedPages, deprecated since 1.36, was removed.
* SpecialBlock::validateTarget, deprecated since 1.36, was removed.
* The PatchFileLocation trait was removed without deprecation.
* ActorMigrationBase::getExistingActorId and ::getNewActorId, hard deprecated
  since 1.36, were removed.
* Hook handlers implementing MediaWikiServicesHook are prohibited from having
  services injected. This is because by definition, this hook runs before the
  service container is fully initialized.
* The protected property LocalFile::$metadata was removed without deprecation.
* WatchedItem::getUser, hard deprecated since 1.36, has been removed.
* AuthManager::singleton, hard deprecated since 1.36, has been removed.
* The AugmentPageProps class was removed without deprecation. It had no known
  uses.
* Html::infobox, deprecated since 1.36, was removed.
* ParserOptions::__construct() now requires that the first parameter is a
  UserIdentity object - passing `null` used to fallback to the global
  $wgUser but was deprecated since 1.36.
* ParserOptions::newCanonical() no longer supports the first parameter being
  null (or omitted entirely), which would fallback to the global $wgUser but
  was deprecated since 1.35.
* The SkinTemplatePreventOtherActiveTabs hook, deprecated in 1.35, was removed
  entirely.
* The SkinTemplateTabAction hook, deprecated in 1.35, was removed entirely.
* The SkinTemplateBuildNavUrlsNav_urlsAfterPermalink hook, deprecated in 1.35,
  was removed entirely.
* The SkinTemplateToolboxEndHook, deprecated in 1.35, was removed entirely.
* The following methods of RevisionStore class, formerly hard deprecated,
  were removed:
  - ::newMutableRevisionFromArray,
  - ::loadRevisionFromPageId,
  - ::loadRevisionFromTitle,
  - ::loadRevisionFromTimestamp,
  - ::listRevisionSizes
* LogEntry::getPerformer, deprecated since 1.36, was removed along with methods
  in subclasses: DatabaseLogEntry, ManualLogEntry, RCDatabaseLogEntry.
* Skin::getRelevantUser now returns an instance of UserIdentity, not necessarily
  a User object. There is no known usages in MediaWiki ecosystem that were not
  satisfied with UserIdentity.
* Direct construction of MergeHistory class, deprecated since 1.35, is no longer
  supported. Use MergeHistoryFactory instead. MergeHistory::checkPermissions,
  deprecated since 1.36, was removed.
* Skin::generateDebugHTML(), deprecated since 1.35, was removed. Call
  MWDebug::getHTMLDebugLog() directly.
* The ApiTestCase class no longer interacts with the global $wgUser.
  Previously, the global variable was set at the start of each test, and in
  ApiTestCase::doApiRequest() if a performer was specified $wgUser was
  updated to match, and if no performer was specified $wgUser was used
  instead. Now, $wgUser is not updated, and if no performer is specified
  the reusable TestUser object for the sysop is relied on. Extensions
  or skins that rely on the global $wgUser variable (which has been
  deprecated since 1.35) should instead retrieve the acting user from the
  relevant context source.
* SkinTemplate::makeArticleUrlDetails, deprecated since 1.35, was removed.
* Skin::makeNSUrl, deprecated since 1.35, was removed.
* Skin::getRevisionId(), deprecated since 1.34, was removed. Use
  OutputPage::getRevisionId() instead.
* Skin::isRevisionCurrent(), deprecated since 1.34, was removed. Use
  OutputPage::isRevisionCurrent() instead.
* AbstractBlock::parseTarget(), deprecated since 1.36, was removed.
* ArticleEditUpdates hook, deprecated since 1.35, was removed.
* @stable to extend class CentralIdLookup has following changes:
  - Protected ::checkAudience method now returns Authority instead of User.
  - A number of it's @stable to override methods now accept Authority instead
    of User as $audience parameter.
  - A number of methods now accept UserIdentity instead of User parameter.
  - ::localUserFromCentralId method now returns UserIdentity and not necessarily
    a User object.
  All extensions that extend this class or use this method were updated to be
  ready to the new behavior.
* WatchedItemStoreInterface::enqueueWatchlistExpiryJob, deprecated since 1.36,
  was removed.
* ResultWrapper is now abstract. It cannot be directly constructed (T286694).
* The SecondaryDataUpdates hook, deprecated in 1.32, was removed entirely.
* Content::getDeletionUpdates(), was removed. Use
  ContentHandler::getDeletionUpdates() instead.
* Content::getSecondaryDataUpdates(), was removed. Use
  ContentHandler::getSecondaryDataUpdates() instead.
* wfDiff(), deprecated since 1.25, has been removed.
* Language::$mLangObjCache, deprecated since 1.35, was removed.
* Language::$transformData, deprecated since 1.35, was removed.
* Language::transformUsingPairFile() was marked @internal. Its deprecated
  parameters are no longer supported.
* SpecialMute::getTarget(), unused outside of the SpecialMute class, was
  made private.
* The Skin::setupSkinUserCss method deprecated in 1.32, was removed. Please use
  skin registration instead.
* The ResourceLoaderSkinModule `legacy`, `content` and `content-thumbnails`
  features were deprecated. Skins should instead select from the features
  listed on [[mw:Manual:ResourceLoaderSkinModule]].
* ParserCache::getKey and ::getEtag, deprecated since 1.36, were removed.
* The BaseTemplateToolbox hook, deprecated since 1.35, was removed.
* Previously a capitalize-all-nouns class was added to the body element of
  languages where nouns must be capitalized. This class is no longer added to
  the body tag and must be provided by skins.
* The SkinTemplateOutputPageBeforeExec hook, deprecated since 1.35, was removed.
* Calling Message::toString() without a parameter, hard-deprecated since 1.36,
  is not longer supported. You can instead use the explicit formatting methods
  directly, such as Message::text() and Message::escaped().
* Article::getContentObject, deprecated since 1.32, was removed.
* Article::delete(), Article::confirmDelete() and ImagePage::delete() were
  hard-deprecated. The logic responsible for building the form is being moved to
  DeleteAction, while the actual deletion logic will be moved to a separate
  service.
* WikiImporter::debugRevisionHandler, unused and for debug only, was removed.
* Content::preloadTransform was hard-deprecated since 1.37,
  use ContentTransformer::preloadTransform instead. Extensions defining
  a content model should override ContentHandler::preloadTransform.
* Content::preSaveTransform was hard-deprecated since 1.37,
  use ContentTransformer::preSaveTransform instead. Extensions defining
  a content model should override ContentHandler::preSaveTransform.
* Skin::bottomScripts is deprecated. Use OutputPage::getBottomScripts instead.
* …

=== Deprecations in 1.37 ===
* JobQueue::getWiki, deprecated in 1.33, now emits deprecation warnings.
* In AbstractBlock, the getTargetAndType() and getTarget() methods are
  hard deprecated. Instead use getTargetName() and getTargetUserIdentity()
  together with getType().
* Deprecated passing UserIdentity to
  WatchlistManager::clearAllUserNotifications() and
  WatchlistManager::clearTitleUserNotifications(). Pass Authority instead.
* Deprecated passing LinkTarget to
  WatchlistManager::clearTitleUserNotifications() and
  WatchlistManager::getTitleNotificationTimestamp(). Pass PageIdentity instead.
* Deprecated User::isWatched(), User::isTempWatched(), User::addWatch(), and
  User::removeWatch(). Use corresponding methods in WatchlistManager instead.
* Deprecated WatchAction::doWatchOrUnwatch(). Use WatchlistManager::setWatch()
  instead.
* Deprecated WatchAction::doWatch() and WatchAction::doUnwatch(). Use
  WatchlistManager::addWatch() or WatchlistManager::removeWatch(), instead.
* WatchAction::getWatchToken is hard deprecated. Instead use
  CsrfTokenSet::getToken
* Action::getHookContainer() has been marked as internal. Actions that require
  access to a hook container should have one injected instead.
* The getTitle() and setTitle() methods in Parser have been deprecated.
  Use getPage() and setPage() instead.
* Title::isWatchable() has been deprecated. Use WatchlistManager::isWatchable()
  instead.
* Methods and classes related to the primary database, previously referred to as
  'master', have been deprecated, with the new ones replacing them as follows:
  - The DBMasterPos and MySQLMasterPos classes have been respectively renamed to
    DBPrimaryPos and MySQLPrimaryPos.
  - LocalRepo::getMasterDB() -> ::getPrimaryDB()
  - ForeignDBRepo::getMasterDB() -> ::getPrimaryDB()
  - JobQueueDB::getMasterDB() -> ::getPrimaryDB()
  - ForeignDBViaLBRepo::getMasterDB() -> ::getPrimaryDB()
  - DBFileJournal::getMasterDB() -> ::getPrimaryDB()
  - ILoadBalancer::getMasterPos() -> ::getPrimaryPos()
  - IDatabase::getMasterPos() -> ::getPrimaryPos()
  - ILoadBalancer::finalizeMasterChanges() -> ::finalizePrimaryChanges()
  - ILoadBalancer::approveMasterChanges() -> ::approvePrimaryChanges()
  - ILoadBalancer::beginMasterChanges() -> ::beginPrimaryChanges()
  - ILBFactory::beginMasterChanges() -> ::beginPrimaryChanges()
  - ILoadBalancer::commitMasterChanges() -> ::commitPrimaryChanges()
  - ILBFactory::commitMasterChanges() -> ::commitPrimaryChanges()
  - IDatabase::getTopologyRootMaster() -> ::getTopologyRootPrimary()
  - IDatabase::masterPosWait() -> ::primaryPosWait()
  - ILoadBalancer::runMasterTransactionIdleCallbacks() ->
      ::runPrimaryTransactionIdleCallbacks()
  - ILoadBalancer::runMasterTransactionListenerCallbacks() ->
      ::runPrimaryTransactionListenerCallbacks()
  - ILoadBalancer::rollbackMasterChanges() -> ::rollbackPrimaryChanges()
  - ILBFactory::rollbackMasterChanges() -> ::rollbackPrimaryChanges()
  - ILoadBalancer::flushMasterSnapshots() -> ::flushPrimarySnapshots()
  - ILoadBalancer::hasMasterConnection() -> ::hasPrimaryConnection()
  - ILoadBalancer::hasMasterChanges() -> ::hasPrimaryChanges()
  - ILBFactory::hasMasterChanges() -> ::hasPrimaryChanges()
  - ILoadBalancer::lastMasterChangeTimestamp() -> ::lastPrimaryChangeTimestamp()
  - ILoadBalancer::hasOrMadeRecentMasterChanges() ->
      ::hasOrMadeRecentPrimaryChanges()
  - ILBFactory::hasOrMadeRecentMasterChanges() ->
      ::hasOrMadeRecentPrimaryChanges()
  - ILoadBalancer::pendingMasterChangeCallers() ->
      ::pendingPrimaryChangeCallers()
  - ILoadBalancer::forEachOpenMasterConnection() ->
      ::forEachOpenPrimaryConnection()
  - ILoadBalancer::waitForMasterPos() -> ::waitForPrimaryPos()
  - Database::assertIsWritableMaster() -> ::assertIsWritablePrimary()
  - RevDelList::reloadFromMaster -> ::reloadFromPrimary()
  - ExternalStoreDB::getMaster -> ::getPrimary()
  - DatabaseMysqlBase::getMasterServerInfo() -> ::getPrimaryServerInfo()
* wfIncrStats(), deprecated in 1.36, now emits deprecation warnings.
* wfCanIPUseHTTPS() is now deprecated, and always returns true.
* The UserLoadFromDatabase hook has been deprecated. It had no known uses.
* AbstractAuthenticationProvider ::setLogger(), ::setManager(), ::setConfig(),
  ::setHookContainer() were soft deprecated. Use ::init() to inject
  dependencies or override ::postInitSetup() to do any custom
  post-initialization configuration.
* The following methods in ApiPageSet have been deprecated:
   - getTitles(), use getTargets() instead.
   - getGoodTitles(), use getGoodPages() instead.
   - getMissingTitles(), use getMissingPages() instead.
   - getGoodAndMissingTitles(), use getGoodAndMissingPages() instead.
   - getRedirectTitles(), use getRedirectTargets() instead.
   - getSpecialTitles(), use getSpecialPages() instead.
* The following functions from the User class, deprecated in 1.35, now emit
  deprecation warnings:
   - getOptions
   - isIP
   - isUsableName
   - isCreatableName
   - getCanonicalName
   - addAutopromoteOnceGroups
   - getEffectiveGroups
   - getAutomaticGroups
   - getFormerGroups
   - getIntOption
* The following methods in User were deprecated:
  - ::idFromName - use UserIdentityLookup::getUserIdentityByName instead.
  - ::resetIdByNameCache - in tests, reset service container. No replacement
    needed in production code.
* Use of ActorMigration for any table except revision, deprecated in 1.34, now
  emits deprecation warnings. Instead of getInsertValues(), use
  ActorNormalization::acquireActorId(). Instead of getWhere() and getJoin(),
  do your own join on the actor table.
* DatabasePostgres::remappedTableName() and its dependent constructor parameter
  'keywordTableMap' are deprecated. Reserved identifiers that are used as table
  names should be quoted where necessary.
* LinkCache::singleton(), deprecated since 1.28, now emits deprecation warnings.
* MessageCache::singleton(), deprecated since 1.34, now emits deprecation
  warnings.
* LockManagerGroup::singleton() and ::destroySingletons(), deprecated since
  1.34, now emit deprecation warnings.
* HtmlFileCacheUpdate::newFromTitles() is now deprecated and emitting warnings.
  Use newFromPages() instead.
* SessionProvider ::setLogger(), ::setManager(), ::setConfig(),
  ::setHookContainer() were soft deprecated. Use ::init() to inject
  dependencies or override ::postInitSetup() to do any custom
  post-initialization configuration.
* User->isLoggedIn(), deprecated since 1.36, now emits deprecation warnings. Use
  the method it wraps, User->isRegistered(), instead.
* FileBackendGroup::singleton() and ::destroySingletons(), deprecated since
  1.35, now emit deprecation warnings.
* The first parameter of User::getBlock should now be an integer using the
  Authority::FOR_XXX constants. Providing a boolean is deprecated.
* ApiBase::addBlockInfoToStatus() is deprecated for use by extensions. It is now
  marked as @internal and may be deleted in the future.
  It should not be necessary to call this method, Authority should be providing
  all relevant information via a PermissionStatus object.
* JobQueueGroup::singleton was deprecated - use
  MediaWikiServices::getJobQueueGroup instead.
* JobQueueGroup::destroySingletons was deprecated. JobQueueGroups are now
  automatically destroyed after tests.
* SessionProvider ::setLogger(), ::setManager(), ::setConfig(),
  ::setHookContainer() were hard deprecated. Use ::init() to inject
  dependencies or override ::postInitSetup() to do any custom
  post-initialization configuration.
* ContentHandler::getContentText() is now soft deprecated.
  Use Content::getText() instead.
* MediaWiki\User\UserNamePrefixSearch::search() previously accepted as
  its first parameter either the string 'public' or a UserIdentity object,
  to filter results for. It now expects an Authority object instead of
  UserIdentity, and providing just a UserIdentity is hard deprecated.
* wfLocalFile(), deprecated since 1.34, now emits deprecation warnings.
* wfFindFile(), deprecated since 1.34, now emits deprecation warnings.
* User::getRights(), deprecated since 1.34, now emits deprecation warnings.
* User::changeableGroups and ::changeableByGroup were hard deprecated, use
  corresponding methods in UserGroupManager instead.
* User::incEditCount() was deprecated in favor of the new method
  UserEditTracker::incrementUserEditCount().
* RepoGroup::singleton(), ::destroySingleton() and ::setSingleton(),
  deprecated since 1.34, now emit deprecation warnings.
* AbstractAuthenticationProvider ::setLogger(), ::setManager(), ::setConfig(),
  ::setHookContainer() were hard deprecated. Use ::init() to inject
  dependencies or override ::postInitSetup() to do any custom
  post-initialization configuration.
* RecentChange::getPerformer(), hard-deprecated since 1.37,
  use getPerformerIdentity() instead.
* ContentHandler::cleanupHandlersCache(), deprecated since 1.35, now emits
  deprecation warnings.
* File::getUser method was hard deprecated, along with overrides in LocalFile
  and ForeignApiFile in favor of ::getUploader.
* SpecialBlock::checkUnblockSelf(), deprecated in 1.36, now emits deprecation
  warnings.
* (T284179) The mediawiki.viewport ResourceLoader module is deprecated. You can
  now just use MutationObserver or InterSectionObserver directly, which are
  widely available in all supported JavaScript browsers.
* The following constructor options of DatabaseBlock class,
  hard deprecated since 1.37:
  - 'byText' property with blocker's name,
    use 'by' property with UserIdentity value instead.
  - 'by' property with blocker's ID,
    use 'by' property with UserIdentity value instead.
* The BeforeResetNotificationTimestamp hook was deprecated.
* ArchivedFile::getUser, ::getRawUser, ::getRawUserText were deprecated in
  favor of ::getUploader. ::getRawDescription was deprecated in favor of
  ::getDescription with RAW audience parameter.
* When calling LocalFile::newFromRow() or LocalFile::loadFromRow(), passing
  extra fields not requested by ::getQueryInfo() is hard deprecated. This is
  to warn callers that deprefixing and automatic assignment of such fields will
  not be done in a future version.
* JobSpecification::getTitle was deprecated without providing a replacement.
  It wasn't used and job given the purpose of JobSpecification class it's
  not needed.
* The protected method File::getImageSize() is deprecated.
* MediaHandler::getImageSize(), ::getMetadata() and ::isMetadataValid were
  deprecated and should no longer be overridden. Instead, subclasses should
  override getSizeAndMetadata().
* Deprecated File::getMetadata(). Instead use ::getMetadataArray(),
  ::getMetadataItem() and ::getMetadataItems().
* Message::title was deprecated, use Message::page instead.
* BaseTemplate::getAfterPortlet, BaseTemplate::renderAfterPortlet and the
  BaseTemplateAfterPortlet hook, which were deprecated in 1.35,
  now emit deprecation warnings.
* LocalFile::getHistory hook is deprecated.
* Calling WikiPage::prepareContentForEdit() without a UserIdentity is now
  deprecated.
* User::getEditTokenObject, ::getEditToken, ::matchEditToken were deprecated.
  Use CsrfTokenRepository, which is available via IContextSource, instead.
  ::matchEditTokenNoSuffix was deprecated without replacement.
  It was introduced to be able to provide custom error message if the token
  was submitted, but ending slashes were stripped by some ASCII mangling proxy.
  Use matchToken instead, such proxies are much less common now and there's
  not much benefit in customising the error message.
* ContentHandler::getForTitle(), deprecated since 1.35, now emits
  deprecation warnings.
* User::listOptionKinds(), deprecated since 1.35, now emits deprecation
  warnings.
* WikiPage::doEditContent(), deprecated since 1.32, now emits deprecation
  warnings.
* CentralIdLookup::factory and ::factoryNonLocal were hard-deprecated,
  obtain an instance from MediaWikiServices instead.
* BotPassword::invalidateAllPasswordsForCentralId() was deprecated.
* BotPassword::removeAllPasswordsForCentralId() was deprecated.
* The Title class members: $mTextform, $mUrlform, $mDbkeyform, $mNamespace,
  $mInterwiki, and $mFragment have been deprecated to not be used directly.
  Instead, their corresponding accessor methods should be used.
* IDatabase::fetchObject(), ::fetchRow(), ::numRows(), ::numFields(),
  ::fieldName(), ::freeResult() and ::dataSeek() are deprecated. Use the
  corresponding methods in IResultWrapper instead.
* ResultWrapper::unwrap(), DatabaseMysqlBase::fieldType() and
  DatabasePostgres::fieldType() are hard-deprecated.
* Subclasses implementing Database::doQuery() should return either boolean or
  an IResultWrapper. To do otherwise is hard-deprecated.
* User::getOptionKinds() and ::resetOptions(), both deprecated since 1.35,
  now emit deprecation warnings.
* wfGetLB(), deprecated since 1.27, now emits deprecation warnings.
* The following methods in MWNamespace, all deprecated since 1.34, now emit
  deprecation warnings:
  - isMovable()
  - isSubject()
  - getTalk()
  - getSubject()
  - getAssociated()
  - equals()
  - subjectEquals()
  - hasTalkNamespace()
  - wantSignatures()
  - isWatchable()
  - getSubjectNamespaces()
  - getTalkNamespaces()
  - isCapitalized()
  - hasGenderDistinction()
  - isNonincludable()
  - getNamespaceContentModel()
  - getRestrictionLevels()
  - getCategoryLinkType()
* LogFormatter::styleRestricedElement() has been deprecated in favor of
  LogFormatter::styleRestrictedElement()
* The following hooks were deprecated:
  - UserLoadOptions: use LoadUserOptions instead.
  - UserSaveOptions: use SaveUserOptions instead.
  - UserResetAllOptions: no replacement was provided, the hook is not used.
* Title::isNamespaceProtected, deprecated in 1.34, is now hard-deprecated.
* UserSelectQueryBuilder::userIds(), ::userNames(), and ::userNamePrefix()
  has been deprecated in favor of ::whereUserIds(), ::whereUserNames(),
  and ::whereUserNamePrefix()
* Manually constructing a MovePage object, deprecated in 1.34,
  is now hard deprecated. Use MovePageFactory instead.
* userCan hook has been deprecated. Use getUserPermissionsErrors or
  getUserPermissionsErrorsExpensive instead.
* Parser::mUser public access, Parser::getUser and ParserOptions::getUser were
  hard deprecated.
* The following methods in the Title class have been deprecated in favor of the
  corresponding methods in the new RestrictionStore service (with different
  names where indicated):
  - areCascadeProtectionSourcesLoaded()
  - areRestrictionsCascading()
  - areRestrictionsLoaded()
  - getAllRestrictions()
  - getCascadeProtectionSources()
  - getFilteredRestrictionTypes()
      -> listAllRestrictionTypes()
  - getRestrictionExpiry()
  - getRestrictionTypes()
      -> listApplicableRestrictionTypes()
  - getRestrictions()
  - isCascadeProtected()
  - isProtected()
  - isSemiProtected()
  - loadRestrictionsFromRows()
* The following Title methods have been deprecated with no direct public
  replacement:
  - deleteTitleProtection()
  - getTitleProtection()
  - flushRestrictions()
  - loadRestrictions()
* User::isAllowUsertalk was hard deprecated. Use User::getBlock and
  AbstractBlock::isUsertalkEditAllowed instead.
* Collation::singleton and ::factory were deprecated, obtain an CollationFactory
  instance from MediaWikiServices instead.
* …

=== Other changes in 1.37 ===
* WatchlistManager::addWatch and WatchlistManager::addWatchIgnoringRights(),
  which replace User::addWatch(), now call the WatchArticle and
  WatchArticleComplete hooks.
* WatchlistManager::removeWatch and
  WatchlistManager::removeWatchIgnoringRights(), which replace
  User::removeWatch(), now call the UnwatchArticle and UnwatchArticleComplete
  hooks.
* The overridable postInitSetup() method was added to the
  AbstractAuthenticationProvider class. A provider can override postInitSetup()
  to do any custom post-initialization configuration.
* The overridable postInitSetup() method was added to the SessionProvider
  class. A provider can override postInitSetup() to do any custom
  post-initialization configuration.
* The protected getConfig() method was added to the SessionProvider class.
  Use SessionProvider::getConfig to get a config.
* The DBAccessBase class is deprecated. Classes that used to extend it
  should get a load balancer (factory) injected in the constructor instead.
* ActorNormalization::acquireActorId now requires IDatabase parameter.
  Not providing one emitted deprecation warnings since 1.36.
* Anti-lock constants ALF_PRELOAD_LINK, ALF_NO_BLOCK_LOCK, ALF_NO_LINK_LOCK
  and ALF_PRELOAD_EXISTENCE have been removed. They're unused since 1.25.
* CSS class 'mw-htmlform-field-autoinfuse' used by some forms has been
  renamed to 'mw-htmlform-autoinfuse'. (T278036)
* User::newFromRow does not accept pre-loaded user preferences under
  $data['user_properties'] anymore. This optimization was not used.
* …

== Compatibility ==

MediaWiki 1.37 requires PHP 7.3.19 or later and the following PHP extensions:

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

MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used,
but support for them is somewhat less mature.

The supported versions are:

* MySQL 5.5.8 or later
* PostgreSQL 9.4 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/mailman/listinfo/mediawiki-l

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

       https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce

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.