ConfigurablePriceResolver.php

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<?php
namespace Magento\ConfigurableProduct\Pricing\Price;

use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Pricing\PriceCurrencyInterface;

class ConfigurablePriceResolver implements PriceResolverInterface
{
    protected $priceResolver;

    protected $priceCurrency;

    protected $configurable;

    private $lowestPriceOptionsProvider;

    public function __construct(
        PriceResolverInterface $priceResolver,
        Configurable $configurable,
        PriceCurrencyInterface $priceCurrency,
        LowestPriceOptionsProviderInterface $lowestPriceOptionsProvider = null
    ) {
        $this->priceResolver = $priceResolver;
        $this->configurable = $configurable;
        $this->priceCurrency = $priceCurrency;
        $this->lowestPriceOptionsProvider = $lowestPriceOptionsProvider ?:
            ObjectManager::getInstance()->get(LowestPriceOptionsProviderInterface::class);
    }

    public function resolvePrice(\Magento\Framework\Pricing\SaleableInterface $product)
    {
        $price = null;

        foreach ($this->lowestPriceOptionsProvider->getProducts($product) as $subProduct) {
            $productPrice = $this->priceResolver->resolvePrice($subProduct);
            $price = isset($price) ? min($price, $productPrice) : $productPrice;
        }

        return (float)$price;
    }
}