RELEASE-NOTES-1.42

= MediaWiki 1.42 =

== MediaWiki 1.42.0-PRERELEASE ==

THIS IS NOT A RELEASE YET

MediaWiki 1.42 is an alpha-quality development branch, and is not recommended
for use in production.

== Upgrading notes for 1.42 ==
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 1.42 upgrades are below:
* …

For notes on 1.41.x and older releases, see HISTORY.

=== Configuration changes for system administrators in 1.42 ===
* …

==== New configuration ====
* $wgMicroStashType: The object cache backend for the MicroStash service.
* $wgEditRecoveryExpiry: Number of seconds to keep edit recovery data
  after the edit is stored.
* $wgDjvuUseBoxedCommand and $wgDjvuShell: A temporary flag to control whether
  or not to use BoxedCommand when wrapping DejaVu rendering, and the command to
  call if so.
* …

==== Changed configuration ====
* …

==== Removed configuration ====
* $wgDisableCookieCheck has been removed.
* $wgStatsCacheType has been removed. Set $wgMicroStashType instead.
* $wgJobSerialCommitThreshold has been removed without deprecation,
  it wasn't used anywhere according to codesearch and any setups using this
  config will perform just fine but might be less performant.
* …

=== New user-facing features in 1.42 ===
* …

=== New features for sysadmins in 1.42 ===
* …

=== New developer features in 1.42 ===
* (T326466) MediaWikiIntegrationTestCase's database and set-up code now avoids
  using dynamic properties, which was causing deprecation warnings in PHP 8.2.
* (T13555) MediaWiki now includes styles that allow more accessible markup for
  section headings. MediaWiki's own HTML output will be changed in the future.
  More information: https://www.mediawiki.org/wiki/Heading_HTML_changes
* (T347347) The CLI installer accepts a "--with-developmentsettings" argument
  to require the DevelopmentSettings.php file at install time.
* …

=== External library changes in 1.42 ===

==== New external libraries ====
* Added mediawiki/json-codec at v2.2.1
* …

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

==== Changed external libraries ====
* Updated OOUI from v0.48.1 to v0.48.2.
* Updated codex, codex-design-tokens and codex-icons
  from v1.0.0 to v1.0.1.
* Updated wikimedia/minify from v2.5.1 to v2.7.0.
* Updated Vue from v3.2.37-compat to v3.3.9.
* …

===== Changed development-only external libraries =====
* Upgraded QUnit from v2.19.4 to v2.20.0.
* …

==== Removed external libraries ====
* …

=== Bug fixes in 1.42 ===
* …

=== Action API changes in 1.42 ===
* APIQueryTags now includes "software" in the "source" array for software
  generated tags. Reliance on the "extension" entries in this array is now
  deprecated, but they will remain for backwards compatibility.
* …

=== Action API internal changes in 1.42 ===
* …

=== Languages updated in 1.42 ===
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.

* (T268143) Language variant conversion has been removed for Kazakh.
* (T351874) Added language support for Komering (kge).
* (T351992) Added language support for Efik (efi).
* …

=== Breaking changes in 1.42 ===
* TitleArray, deprecated since 1.41, has been removed.
* UserRightsProxy, deprecated since 1.38, has been removed.
* UserLoginCompleteHook is always called with its $direct parameter set to
  boolean true. The false case has been removed.
* MagicWord::load() has been marked @internal and may change in the future
  without further notice.
* BagOStuff::setNewPreparedValues() now emits deprecation warnings.
* MediaWiki's virtualrest internal library has been removed in favor of the
  HTTP library like: Guzzle, MultiHttpClient or MwHttpRequest.
* Several deprecated methods have been removed from the Content interface,
  in favor of the respective methods in ContentHandlers. Callers should
  use a more narrow interface like ContentRenderer or ContentTransformer
  when possible. The following methods have been removed from Content:
  - getParserOutput()
  - preSaveTransform()
  - preloadTransform()
  - prepareSave()
* ParserOutput::setFlag() and ::getFlag(), deprecated in 1.38, were removed. You
  should use ::setOutputFlag() and ::getOutputFlag() instead.
* PostgresUpdater::addPgEnumValue() unused everywhere, have been removed
  without deprecation. Use of ENUM is highly discouraged.
* ILoadBalancer::getAnyOpenConnection() has been removed without deprecation,
  use ::getConnection() instead.
* LanguageConverter's internal properties, all deprecated in 1.35 or 1.36, have
  now had their deprecated property accessors dropped:
  - mConvRuleTitle
  - mUserVariant
  - mHeaderVariant
  - mMaxDepth
  - mVarSeparatorPattern
  - mLangObj
  - mTablesLoaded
  - mTables
  - mVariants
  - mMainLanguageCode
  - mVariantFallbacks
  - mFlags
  - mVariantNames
  - mDescCodeSep
  - mDescVarSep
* OutputPage::addParserOutputText has been marked @internal since there are no
  known users of it. Its old behavior has been deprecated and will change
  in the future without further notice.
* MediaWikiIntegrationTestCase::$tablesUsed has been deprecated. The framework
  now detects these automatically.
* Support for setting dynamic property on StatusValue object has been removed.
  To pass your arbitrary data along the object, use StatusValue::statusData
  property (which is always declared).
* The global function wfReportTime(), deprecated since 1.40, has been removed.
* The skin template parameter 'reporttime', deprecated since 1.41, has been
  removed.
* WikiPage::getPageIsRedirectField(), deprecated since 1.41, has been removed.
* WikiPage::insertRedirect(), deprecated since 1.41, has been removed.
* Several methods in PageArchive, all deprecated in 1.38, have been removed:
  - ::listRevisions()
  - ::getRevisionRecordByTimestamp()
  - ::getArchivedRevisionRecord()
  - ::getPreviousRevisionRecord()
  - ::getLastRevisionId()
  - ::isDeleted()
  - ::getFileStatus()
  - ::getRevisionStatus()
* Database, DatabaseInstaller, DatabaseUpdater, DBPrimaryPos, ResultWrapper and
  SQLPlatform are no longer stable to extend. It is not possible to define
  database types in an extension.
* UserDef::PARAM_ALLOWED_USER_TYPES now differentiates between temporary account
  usernames and user accounts. Any endpoints that want temp users to be
  valid but were passing a name through will break. Temp users must now be
  explicitly allowed.
* The Hooks class, a legacy wrapper for HooksContainer, has been removed. All of
  its contents have been previously deprecated in 1.35 (or 1.41 for ::runner()):
  - ::register()
  - ::clear(),
  - ::isRegistered()
  - ::getHandlers()
  - ::run()
  - ::runWithoutAbort()
  - ::runner()
* …

=== Deprecations in 1.42 ===
* (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 63% in MediaWiki 1.41.0). The following have newly
  been moved:
  - MediaWiki\Deferred:
    - AtomicSectionUpdate
    - AutoCommitUpdate
    - CdnCacheUpdate
    - DataUpdate
    - DeferrableCallback
    - DeferrableUpdate
    - DeferredUpdates
    - DeferredUpdatesScope
    - DeferredUpdatesScopeMediaWikiStack
    - DeferredUpdatesScopeStack
    - EnqueueableDataUpdate
    - HtmlFileCacheUpdate
    - JobQueueEnqueueUpdate
    - MWCallableUpdate
    - MergeableUpdate
    - MessageCacheUpdate
    - SearchUpdate
    - SendPasswordResetEmailUpdate
    - SiteStatsUpdate
    - TransactionRoundAwareUpdate
    - TransactionRoundDefiningUpdate
    - UserEditCountInfo
    - UserEditCountUpdate
* API modules using ApiBase::requirePostedParameters() must also override
  mustBePosted() to return true.
* BlockManager::getUserBlock() was deprecated. Instead use
  BlockManager::getBlock(), which expects the caller to do ipblock-exempt
  checking.
* User::isBlocked(), ::isBlockedFromCreateAccount() and ::isBlockedFrom() now
  emit deprecation warnings. They were deprecated since 1.34, 1.37 and 1.33
  respectively.
* DatabaseBlock::newFromID() was deprecated and will emit deprecation warnings.
  Instead use DatabaseBlockStore::newFromID().
* DatabaseBlock::getAutoblockExpiry() was deprecated without replacement.
* MagicWord::getId() has been deprecated.
* MagicWordFactory::getSubstIDs() has been deprecated.
* Status::setMessageLocalizer is deprecated. Callers that want to control the
  localization of the Status object should obtain a StatusFormatter from
  the StatusFormatterFactory.
* Vuex has been deprecated in favor of its successor, Pinia. Though deprecated,
  Vuex 4 will remain accessible for the foreseeable future. Pinia should be used
  for new projects.
* Title::getBrokenLinksFrom() has been deprecated.
* ParserOutput::setLanguageLinks() has been deprecated.
* ApiQueryBlockInfoTrait::addBlockInfoToQuery() will emit deprecation warnings
  and will soon stop working due to schema changes. Instead use
  addDeletedUserFilter() or getBlockDetailsForRows().
* DatabaseBlockStore::updateTimestamp() is now internal and should not be
  called.
* The module `mediawiki.icon` has been deprecated. Use the Codex mixin instead
  (T351681).
* Passing a WikiPage to PageEditStash::parseAndCache() has been deprecated.
  Use PageUpdater instance.
* (T352284) Some user options-related classes were moved over to the existing
  MediaWiki\User\Options namespace. Old names are deprecated and kept as
  aliases for backwards-compatibility:
   - DefaultOptionsLookup
   - UserOptionsLookup
   - UserOptionsManager
   - StaticUserOptionsLookup
* …

=== Other changes in 1.42 ===
* Gallery: Image captions are no longer wrapped in <p> tags. Skins that
  customize rendering for galleries may need to tweak their CSS.
* …

== Compatibility ==

MediaWiki 1.42 requires PHP 7.4.3 or later and the following PHP extensions:

* ctype
* dom
* fileinfo
* iconv
* intl
* json
* mbstring
* 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/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.