ValueFactory.php

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<?php
namespace Magento\Framework\App\Config;

class ValueFactory
{
    protected $_objectManager = null;

    protected $_instanceName = null;

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        $instanceName = \Magento\Framework\App\Config\ValueInterface::class
    ) {
        $this->_objectManager = $objectManager;
        $this->_instanceName = $instanceName;
    }

    public function create(array $data = [])
    {
        $model = $this->_objectManager->create($this->_instanceName, $data);
        if (!$model instanceof \Magento\Framework\App\Config\ValueInterface) {
            throw new \InvalidArgumentException('Invalid config field model: ' . $this->_instanceName);
        }
        return $model;
    }
}