Product::externalizeFieldsGet

public function externalizeFieldsGet($fields, $fieldsInfo = []): array
{
	// param - IBLOCK_ID is reqired in filter
	$iblockId = (int)($fields['IBLOCK_ID'] ?? 0);
	$productType = (int)($fields['TYPE'] ?? 0);

	$propertyValues = $this->getFieldsIBlockPropertyValuesByFilter(['IBLOCK_ID' => $iblockId]);
	$product = $this->getFieldsCatalogProductByFilter(['IBLOCK_ID' => $iblockId, 'PRODUCT_TYPE' => $productType]);

	if ($product->isSuccess())
	{
		$fieldsInfo = array_merge(
			$this->getFieldsIBlockElement(),
			($propertyValues->isSuccess() ? $propertyValues->getData() : []),
			$this->getFieldsCatalogProductCommonFields(),
			$product->getData()
		);
	}
	else
	{
		// if it was not possible to determine the view fields by product type,
		// we get the default fields, all fields of the catalog and fields of the Information Block

		$fieldsInfo = array_merge(
			$this->getFields(),
			($propertyValues->isSuccess() ? $propertyValues->getData() : [])
		);
	}
	unset($product, $propertyValues);

	return parent::externalizeFieldsGet($fields, $fieldsInfo);
}