Loader.php

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<?php
namespace Magento\ConfigurableProduct\Helper\Product\Options;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\ConfigurableProduct\Api\Data\OptionInterface;
use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
use Magento\ConfigurableProduct\Api\Data\OptionValueInterfaceFactory;
use Magento\Framework\Api\ExtensionAttribute\JoinProcessorInterface;

class Loader
{
    private $optionValueFactory;

    private $extensionAttributesJoinProcessor;

    public function __construct(
        OptionValueInterfaceFactory $optionValueFactory,
        JoinProcessorInterface $extensionAttributesJoinProcessor
    ) {
        $this->optionValueFactory = $optionValueFactory;
        $this->extensionAttributesJoinProcessor = $extensionAttributesJoinProcessor;
    }

    public function load(ProductInterface $product)
    {
        $options = [];
        $typeInstance = $product->getTypeInstance();
        $attributeCollection = $typeInstance->getConfigurableAttributeCollection($product);
        $this->extensionAttributesJoinProcessor->process($attributeCollection);
        foreach ($attributeCollection as $attribute) {
            $values = [];
            $attributeOptions = $attribute->getOptions();
            if (is_array($attributeOptions)) {
                foreach ($attributeOptions as $option) {
                    $value = $this->optionValueFactory->create();
                    $value->setValueIndex($option['value_index']);
                    $values[] = $value;
                }
            }
            $attribute->setValues($values);
            $options[] = $attribute;
        }

        return $options;
    }
}