---
title: "Feature: #90249 - New PSR-14 events for existing package-related Signal Slots"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:feature-90249"
source: "Changelog/10.3/Feature-90249-NewPSR-14EventsForExistingPackage-relatedSignalSlots.rst"
typo3-version: "10.3"
typo3-major: 10
type: "feature"
issue: 90249
forge: "https://forge.typo3.org/issues/90249"
tags: ["PHP-API", "ext:core"]
rendered: "2026-09-20T18:31:11+00:00"
---

# Feature: #90249 - New PSR-14 events for existing package-related Signal Slots {#feature-90249}

See [forge#90249](https://forge.typo3.org/issues/90249)

## Description {#description}

PSR-14-based event dispatching allows for TYPO3 extensions or PHP packages to
extend TYPO3 Core functionality in an exchangeable way.

The following new PSR-14 events have been introduced:

-   `\TYPO3\CMS\Core\Package\Event\PackagesMayHaveChangedEvent`
-   `\TYPO3\CMS\Core\Package\Event\AfterPackageActivationEvent`
-   `\TYPO3\CMS\Core\Package\Event\AfterPackageDeactivationEvent`
-   `\TYPO3\CMS\Core\Package\Event\BeforePackageActivationEvent`
-   `\TYPO3\CMS\Extensionmanager\Event\AfterExtensionDatabaseContentHasBeenImportedEvent`
-   `\TYPO3\CMS\Extensionmanager\Event\AfterExtensionStaticDatabaseContentHasBeenImportedEvent`
-   `\TYPO3\CMS\Extensionmanager\Event\AfterExtensionFilesHaveBeenImportedEvent`
-   `\TYPO3\CMS\Extensionmanager\Event\AvailableActionsForExtensionEvent`

They replace the existing Extbase-based Signal Slots:

-   `PackageManagement::packagesMayHaveChanged`
-   `TYPO3\CMS\Extensionmanager\Utility\InstallUtility::afterExtensionInstall`
-   `TYPO3\CMS\Extensionmanager\Utility\InstallUtility::afterExtensionUninstall`
-   `TYPO3\CMS\Extensionmanager\Utility\InstallUtility::afterExtensionT3DImport`
-   `TYPO3\CMS\Extensionmanager\Utility\InstallUtility::afterExtensionStaticSqlImport`
-   `TYPO3\CMS\Extensionmanager\Utility\InstallUtility::afterExtensionFileImport`
-   `TYPO3\CMS\Extensionmanager\Service\ExtensionManagementService::willInstallExtensions`
-   `TYPO3\CMS\Extensionmanager\ViewHelper\ProcessAvailableActionsViewHelper::processActions`

## Impact {#impact}

It is now possible to add listeners to the new PSR-14 Events which
define a clear API what can be read or modified.

The listeners can be added to the `Configuration/Services.yaml` as
it is done in TYPO3's shipped extensions as well.