8 files declare their use of EntityReferenceFieldItemListInterface
- EntityReferenceFieldNormalizer.php in core/modules/ jsonapi/ src/ Normalizer/ EntityReferenceFieldNormalizer.php 
- EntityReferenceFormatterBase.php in core/lib/ Drupal/ Core/ Field/ Plugin/ Field/ FieldFormatter/ EntityReferenceFormatterBase.php 
- FileMediaFormatterBase.php in core/modules/ file/ src/ Plugin/ Field/ FieldFormatter/ FileMediaFormatterBase.php 
- ImageFormatterBase.php in core/modules/ image/ src/ Plugin/ Field/ FieldFormatter/ ImageFormatterBase.php 
- MetaEventSubscriber.php in core/modules/ jsonapi/ tests/ modules/ jsonapi_test_meta_events/ src/ EventSubscriber/ MetaEventSubscriber.php 
- Relationship.php in core/modules/ jsonapi/ src/ JsonApiResource/ Relationship.php 
- ResourceIdentifier.php in core/modules/ jsonapi/ src/ JsonApiResource/ ResourceIdentifier.php 
- ResourceObjectNormalizer.php in core/modules/ jsonapi/ src/ Normalizer/ ResourceObjectNormalizer.php 
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