Expanded class hierarchy of FormatterInterface in Drupal 8

interface \Drupal\Component\Plugin\PluginInspectionInterface; interface \Drupal\Core\Config\Entity\ThirdPartySettingsInterface
- interface \Drupal\Core\Field\PluginSettingsInterface
  - interface \Drupal\Core\Field\FormatterInterface
    interface \Drupal\fb_instant_articles\Plugin\Field\InstantArticleFormatterInterface
  - interface \Drupal\Core\Field\WidgetBaseInterface

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