9 files declare their use of ImageStyleInterface in Zircon Profile 8

ImageAdminStylesTest.php in core/modules/image/src/Tests/ImageAdminStylesTest.php

Contains \Drupal\image\Tests\ImageAdminStylesTest.

ImageEffectAddForm.php in core/modules/image/src/Form/ImageEffectAddForm.php

Contains \Drupal\image\Form\ImageEffectAddForm.

ImageEffectDeleteForm.php in core/modules/image/src/Form/ImageEffectDeleteForm.php

Contains \Drupal\image\Form\ImageEffectDeleteForm.

ImageEffectEditForm.php in core/modules/image/src/Form/ImageEffectEditForm.php

Contains \Drupal\image\Form\ImageEffectEditForm.

ImageEffectFormBase.php in core/modules/image/src/Form/ImageEffectFormBase.php

Contains \Drupal\image\Form\ImageEffectFormBase.

ImageStyle.php in core/modules/image/src/Entity/ImageStyle.php

Contains \Drupal\image\Entity\ImageStyle.

ImageStyleDownloadController.php in core/modules/image/src/Controller/ImageStyleDownloadController.php

Contains \Drupal\image\Controller\ImageStyleDownloadController.

image_module_test.module in core/modules/image/tests/modules/image_module_test/image_module_test.module

Provides Image module hook implementations for testing purposes.

MigrateImageStylesTest.php in core/modules/image/src/Tests/Migrate/d7/MigrateImageStylesTest.php

Contains \Drupal\image\Tests\Migrate\d7\MigrateImageStylesTest.