Renderer.php

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<?php
namespace Magento\Downloadable\Block\Checkout\Cart\Item;

use Magento\Framework\Pricing\PriceCurrencyInterface;
use Magento\Framework\View\Element\Message\InterpretationStrategyInterface;

class Renderer extends \Magento\Checkout\Block\Cart\Item\Renderer
{
    protected $_downloadableProductConfiguration = null;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Catalog\Helper\Product\Configuration $productConfig,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Catalog\Block\Product\ImageBuilder $imageBuilder,
        \Magento\Framework\Url\Helper\Data $urlHelper,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        PriceCurrencyInterface $priceCurrency,
        \Magento\Framework\Module\Manager $moduleManager,
        InterpretationStrategyInterface $messageInterpretationStrategy,
        \Magento\Downloadable\Helper\Catalog\Product\Configuration $downloadableProductConfiguration,
        array $data = []
    ) {
        $this->_downloadableProductConfiguration = $downloadableProductConfiguration;
        parent::__construct(
            $context,
            $productConfig,
            $checkoutSession,
            $imageBuilder,
            $urlHelper,
            $messageManager,
            $priceCurrency,
            $moduleManager,
            $messageInterpretationStrategy,
            $data
        );
    }

    public function getLinks()
    {
        if (!$this->getItem()) {
            return [];
        }
        return $this->_downloadableProductConfiguration->getLinks($this->getItem());
    }

    public function getLinksTitle()
    {
        return $this->_downloadableProductConfiguration->getLinksTitle($this->getProduct());
    }

    public function getOptionList()
    {
        return $this->_downloadableProductConfiguration->getOptions($this->getItem());
    }

    public function getOption($item)
    {
        return $this->_downloadableProductConfiguration->getOptions($item);
    }
}