8 files declare their use of PostRequireEvent

ChangeLogger.php in core/modules/package_manager/src/EventSubscriber/ChangeLogger.php
DirectWriteSubscriber.php in core/modules/package_manager/src/EventSubscriber/DirectWriteSubscriber.php
DirectWriteTest.php in core/modules/package_manager/tests/src/Kernel/DirectWriteTest.php
EventLogSubscriber.php in core/modules/package_manager/tests/modules/package_manager_test_event_logger/src/EventSubscriber/EventLogSubscriber.php
SandboxManagerBase.php in core/modules/package_manager/src/SandboxManagerBase.php
StageEventsTest.php in core/modules/package_manager/tests/src/Kernel/StageEventsTest.php
StageLoggedOnErrorTest.php in core/modules/package_manager/tests/src/Kernel/StageLoggedOnErrorTest.php
TestSubscriber.php in core/modules/package_manager/tests/modules/package_manager_test_validation/src/EventSubscriber/TestSubscriber.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.