---
title: "Deprecation: #89733 - Signal Slots in Core Extension migrated to PSR-14 events"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:deprecation-89733"
source: "Changelog/10.2/Deprecation-89733-SignalSlotsInCoreExtensionMigratedToPSR-14Events.rst"
typo3-version: "10.2"
typo3-major: 10
type: "deprecation"
issue: 89733
forge: "https://forge.typo3.org/issues/89733"
tags: ["PHP-API", "FullyScanned", "ext:core"]
rendered: "2026-09-17T21:17:42+00:00"
---

# Deprecation: #89733 - Signal Slots in Core Extension migrated to PSR-14 events {#deprecation-89733-signal-slots-in-core-extension-migrated-to-psr-14-events}

See [forge#89733](https://forge.typo3.org/issues/89733)

## Description {#description}

The following Signal Slots have been replaced by new PSR-14 events
which can be used as 1:1 equivalents:

-   `TYPO3\CMS\Backend\Backend\ToolbarItems\SystemInformationToolbarItem::getSystemInformation`
-   `TYPO3\CMS\Backend\Backend\ToolbarItems\SystemInformationToolbarItem::loadMessages`
-   `TYPO3\CMS\Backend\LoginProvider\UsernamePasswordLoginProvider::getPageRenderer`
-   `TYPO3\CMS\Backend\Controller\EditDocumentController::preInitAfter`
-   `TYPO3\CMS\Backend\Controller\EditDocumentController::initAfter`
-   `TYPO3\CMS\Backend\Utility\BackendUtility::getPagesTSconfigPreInclude`
-   `TYPO3\CMS\Beuser\Controller\BackendUserController::switchUser`
-   `TYPO3\CMS\Core\Database\SoftReferenceIndex::setTypoLinkPartsElement`
-   `TYPO3\CMS\Core\Database\ReferenceIndex::shouldExcludeTableFromReferenceIndex`
-   `TYPO3\CMS\Core\Imaging\IconFactory::buildIconForResourceSignal`
-   `TYPO3\CMS\Core\Tree\TableConfiguration\DatabaseTreeDataProvider::PostProcessTreeData`
-   `TYPO3\CMS\Core\Utility\ExtensionManagementUtility::tcaIsBeingBuilt`
-   `TYPO3\CMS\Impexp\Utility\ImportExportUtility::afterImportExportInitialisation`
-   `TYPO3\CMS\Install\Service\SqlExpectedSchemaService::tablesDefinitionIsBeingBuilt`
-   `TYPO3\CMS\Lang\Service\TranslationService::postProcessMirrorUrl`
-   `TYPO3\CMS\Linkvalidator\LinkAnalyzer::beforeAnalyzeRecord`
-   `TYPO3\CMS\Seo\Canonical\CanonicalGenerator::beforeGeneratingCanonical`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_GenerateDataArray_BeforeCaching`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_GenerateDataArray_PostProcesss`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_GetDataArray_PostProcesss`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_SortDataArray_PostProcesss`

In addition, the following public constants, marking a signal name, are deprecated:

-   `TYPO3\CMS\Core\Tree\TableConfiguration\DatabaseTreeDataProvider::SIGNAL_PostProcessTreeData`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_GenerateDataArray_BeforeCaching`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_GenerateDataArray_PostProcesss`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_GetDataArray_PostProcesss`
-   `TYPO3\CMS\Workspaces\Service\GridDataService::SIGNAL_SortDataArray_PostProcesss`

## Impact {#impact}

Using the mentioned signals will trigger a deprecation warning.

## Affected Installations {#affected-installations}

TYPO3 installations with custom extensions using these signals.

## Migration {#migration}

Use the new PSR-14 alternatives:

-   `\TYPO3\CMS\Backend\Authentication\Event\SwitchUserEvent`
-   `\TYPO3\CMS\Backend\Backend\Event\SystemInformationToolbarCollectorEvent`
-   `\TYPO3\CMS\Backend\Controller\Event\BeforeFormEnginePageInitializedEvent`
-   `\TYPO3\CMS\Backend\Controller\Event\AfterFormEnginePageInitializedEvent`
-   `\TYPO3\CMS\Backend\LoginProvider\Event\ModifyPageLayoutOnLoginProviderSelectionEvent`
-   `\TYPO3\CMS\Core\Imaging\Event\ModifyIconForResourcePropertiesEvent`
-   `\TYPO3\CMS\Core\DataHandling\Event\IsTableExcludedFromReferenceIndexEvent`
-   `\TYPO3\CMS\Core\DataHandling\Event\AppendLinkHandlerElementsEvent`
-   `\TYPO3\CMS\Core\Configuration\Event\AfterTcaCompilationEvent`
-   `\TYPO3\CMS\Core\Database\Event\AlterTableDefinitionStatementsEvent`
-   `\TYPO3\CMS\Core\Tree\Event\ModifyTreeDataEvent`
-   `\TYPO3\CMS\Core\Configuration\Event\ModifyLoadedPageTsConfigEvent`
-   `\TYPO3\CMS\Impexp\Event\BeforeImportEvent`
-   `\TYPO3\CMS\Install\Service\Event\ModifyLanguagePackRemoteBaseUrlEvent`
-   `\TYPO3\CMS\Linkvalidator\Event\BeforeRecordIsAnalyzedEvent`
-   `\TYPO3\CMS\Seo\Event\ModifyUrlForCanonicalTagEvent`
-   `\TYPO3\CMS\Workspaces\Event\AfterCompiledCacheableDataForWorkspaceEvent`
-   `\TYPO3\CMS\Workspaces\Event\AfterDataGeneratedForWorkspaceEvent`
-   `\TYPO3\CMS\Workspaces\Event\GetVersionedDataEvent`
-   `\TYPO3\CMS\Workspaces\Event\SortVersionedDataEvent`