16 files declare their use of PreRequireEvent

BaseRequirementsFulfilledValidator.php in core/modules/package_manager/src/Validator/BaseRequirementsFulfilledValidator.php
BaseRequirementsFulfilledValidatorTest.php in core/modules/package_manager/tests/src/Kernel/BaseRequirementsFulfilledValidatorTest.php
BaseRequirementValidatorTrait.php in core/modules/package_manager/src/Validator/BaseRequirementValidatorTrait.php
ComposerMinimumStabilityValidator.php in core/modules/package_manager/src/Validator/ComposerMinimumStabilityValidator.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
LockFileValidator.php in core/modules/package_manager/src/Validator/LockFileValidator.php
LockFileValidatorTest.php in core/modules/package_manager/tests/src/Kernel/LockFileValidatorTest.php
PhpTufValidator.php in core/modules/package_manager/src/Validator/PhpTufValidator.php
PhpTufValidatorTest.php in core/modules/package_manager/tests/src/Kernel/PhpTufValidatorTest.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
SymlinkValidator.php in core/modules/package_manager/src/Validator/SymlinkValidator.php
TestSubscriber.php in core/modules/package_manager/tests/modules/package_manager_test_validation/src/EventSubscriber/TestSubscriber.php

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