isRulesFilterValid example

        $priceDefinition = $discount->getPriceDefinition();

        $newPackages = [];

        foreach ($packages as $package) {
            $foundItems = [];

            foreach ($package->getMetaData() as $item) {
                $lineItem = $package->getCartItem($item->getLineItemId());

                if ($this->isRulesFilterValid($lineItem, $priceDefinition, $context)) {
                    $item = new LineItemQuantity(
                        $lineItem->getId(),
                        $lineItem->getQuantity()
                    );

                    $foundItems[] = $item;
                }
            }

            if (\count($foundItems) > 0) {
                $newPackages[] = new DiscountPackage(new LineItemQuantityCollection($foundItems));
            }