Default field value. The default value is used when an entity is created, either: through an entity creation

public static BaseFieldOverride::loadByName($entity_type_id

public FieldStorageConfigInterface::ge

public FieldStorageConfig::getType()

protected FieldUninstallValidator::getFieldTyp

public FieldStorageConfig::calculateDependencies()

public EntityReferenceFieldItemList::ref

public FieldConfigBase::postCreate(EntityStorageInterface $storage)

public FieldItemDataDefinition::getField

public FieldConfigBase::setDescription($description)