All classes that implement ConfigEntityInterface

class \Drupal\Core\Config\Entity\ConfigEntityBase implements ConfigEntityInterface
class \Drupal\breakpoint\Plugin\Core\Entity\Breakpoint
class \Drupal\breakpoint\Plugin\Core\Entity\BreakpointGroup
class \Drupal\config_test\Plugin\Core\Entity\ConfigTest
class \Drupal\contact\Plugin\Core\Entity\Category
class \Drupal\image\Plugin\Core\Entity\ImageStyle
class \Drupal\layout\Config\DisplayBase implements DisplayInterface
class \Drupal\layout\Plugin\Core\Entity\Display implements BoundDisplayInterface
class \Drupal\layout\Plugin\Core\Entity\UnboundDisplay implements UnboundDisplayInterface
class \Drupal\picture\Plugin\Core\Entity\PictureMapping
class \Drupal\views\Plugin\Core\Entity\View implements ViewStorageInterface
class \Drupal\views_ui\ViewUI implements ViewStorageInterface

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