13 files declare their use of ConfigImporter in Zircon Profile 8

ConfigImporterFieldPurger.php in core/modules/field/src/ConfigImporterFieldPurger.php

Contains \Drupal\field\ConfigImporterFieldPurger.

ConfigImporterMissingContentTest.php in core/modules/config/src/Tests/ConfigImporterMissingContentTest.php

Contains \Drupal\config\Tests\ConfigImporterMissingContentTest.

ConfigImporterTest.php in core/modules/config/src/Tests/ConfigImporterTest.php

Contains \Drupal\config\Tests\ConfigImporterTest.

ConfigImportRecreateTest.php in core/modules/config/src/Tests/ConfigImportRecreateTest.php

Contains \Drupal\config\Tests\ConfigImportRecreateTest.

ConfigImportRenameValidationTest.php in core/modules/config/src/Tests/ConfigImportRenameValidationTest.php

Contains \Drupal\config\Tests\ConfigImportRenameValidationTest.

ConfigImportSubscriber.php in core/lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php

Contains \Drupal\Core\EventSubscriber\ConfigImportSubscriber.

ConfigSingleImportForm.php in core/modules/config/src/Form/ConfigSingleImportForm.php

Contains \Drupal\config\Form\ConfigSingleImportForm.

ConfigSync.php in core/modules/config/src/Form/ConfigSync.php

Contains \Drupal\config\Form\ConfigSync.

ContentEntityNullStorageTest.php in core/modules/system/src/Tests/Entity/ContentEntityNullStorageTest.php

Contains \Drupal\system\Tests\Entity\ContentEntityNullStorageTest.

ContentTranslationConfigImportTest.php in core/modules/content_translation/src/Tests/ContentTranslationConfigImportTest.php

Contains \Drupal\content_translation\Tests\ContentTranslationConfigImportTest.

field.module in core/modules/field/field.module

Attach custom data fields to Drupal entities.

KernelTestBase.php in core/tests/Drupal/KernelTests/KernelTestBase.php

Contains \Drupal\KernelTests\KernelTestBase.

TestBase.php in core/modules/simpletest/src/TestBase.php

Contains \Drupal\simpletest\TestBase.