12 files declare their use of FieldPurger

BulkDeleteTest.php in core/modules/field/tests/src/Kernel/BulkDeleteTest.php
CommentUninstallTest.php in core/modules/comment/tests/src/Kernel/CommentUninstallTest.php
ConfigImportAllTest.php in core/modules/config/tests/src/Functional/ConfigImportAllTest.php
ConfigImporterFieldPurger.php in core/modules/field/src/ConfigImporterFieldPurger.php
EntityBundleFieldTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityBundleFieldTest.php
EntityDefinitionUpdateMultipleTypesTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateMultipleTypesTest.php
EntityDefinitionUpdateProviderTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityDefinitionUpdateProviderTest.php
field.purge.inc in core/modules/field/field.purge.inc
FieldConfigDeleteForm.php in core/modules/field_ui/src/Form/FieldConfigDeleteForm.php
FieldDataCountTest.php in core/modules/field/tests/src/Kernel/FieldDataCountTest.php
FieldImportDeleteTest.php in core/modules/field/tests/src/Kernel/FieldImportDeleteTest.php
SystemHooks.php in core/modules/system/src/Hook/SystemHooks.php

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