BeforePackageActivationEvent 

The PSR-14 event \TYPO3\CMS\Core\Package\Event\BeforePackageActivationEvent is triggered before a number of packages should become active.

Example 

API 

class BeforePackageActivationEvent
Fully qualified name
\TYPO3\CMS\Core\Package\Event\BeforePackageActivationEvent

Event that is triggered before a number of packages should become active

getPackageKeys ( )
Returns
array