FinalPrice.php

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

class FinalPrice extends \Magento\Catalog\Pricing\Price\FinalPrice
{
    protected $priceResolver;

    protected $values = [];

    public function __construct(
        \Magento\Framework\Pricing\SaleableInterface $saleableItem,
        $quantity,
        \Magento\Framework\Pricing\Adjustment\CalculatorInterface $calculator,
        \Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency,
        PriceResolverInterface $priceResolver
    ) {
        parent::__construct($saleableItem, $quantity, $calculator, $priceCurrency);
        $this->priceResolver = $priceResolver;
    }

    public function getValue()
    {
        if (!isset($this->values[$this->product->getId()])) {
            $this->values[$this->product->getId()] = $this->priceResolver->resolvePrice($this->product);
        }

        return $this->values[$this->product->getId()];
    }
}