ByConcreteProduct::getBasketItems

static function getBasketItems(Entity $entity): array
{
	if (!$entity instanceof Shipment)
	{
		return [];
	}

	$basketItems = [];

	/** @var ShipmentItem $shipmentItem */
	foreach ($entity->getShipmentItemCollection()->getSellableItems() as $shipmentItem)
	{
		$basketItems[] = $shipmentItem->getBasketItem();
	}

	return $basketItems;
}