9 files declare their use of ImageStyleInterface in Drupal 9

ImageAdminStylesTest.php in core/modules/image/tests/src/Functional/ImageAdminStylesTest.php

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

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

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

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

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

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

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/tests/src/Kernel/Migrate/d7/MigrateImageStylesTest.php