DefaultValue.php

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<?php
declare(strict_types=1);

namespace Magento\Ui\Component\Form\Field;

use Magento\Framework\View\Element\UiComponentFactory;
use Magento\Framework\View\Element\UiComponent\ContextInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;

class DefaultValue extends \Magento\Ui\Component\Form\Field
{
    private $scopeConfig;

    private $path;

    private $storeManager;

    public function __construct(
        ContextInterface $context,
        UiComponentFactory $uiComponentFactory,
        ScopeConfigInterface $scopeConfig,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        string $path = '',
        array $components = [],
        array $data = []
    ) {
        parent::__construct($context, $uiComponentFactory, $components, $data);
        $this->scopeConfig = $scopeConfig;
        $this->storeManager = $storeManager;
        $this->path = $path;
    }

    public function prepare()
    {
        parent::prepare();
        $store = $this->storeManager->getStore();
        $this->_data['config']['default'] = $this->scopeConfig->getValue(
            $this->path,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
            $store
        );
    }
}