SkuCollectionQuery::findBarcode

private function findBarcode(BaseSku $sku): string
{
	$barcode = '';
	$barcodeEntity = $sku->getBarcodeCollection()->getFirst();

	/** @var Barcode|null $barcodeEntity */
	if ($barcodeEntity)
	{
		$barcode = $barcodeEntity->getBarcode() ?? '';
	}

	return $barcode;
}