Config.php

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<?php
namespace Magento\Framework\View;

use Magento\Framework\View\Asset\Repository;
use Magento\Framework\Config\ViewFactory;

class Config implements \Magento\Framework\View\ConfigInterface
{
    protected $viewConfigs = [];

    protected $assetRepo;

    protected $viewConfigFactory;

    public function __construct(
        Repository $assetRepo,
        ViewFactory $viewConfigFactory
    ) {
        $this->assetRepo = $assetRepo;
        $this->viewConfigFactory = $viewConfigFactory;
    }

    public function getViewConfig(array $params = [])
    {
        $this->assetRepo->updateDesignParams($params);
        $viewConfigParams = [];

        if (isset($params['themeModel'])) {
            $currentTheme = $params['themeModel'];
            $key = $currentTheme->getFullPath();
            if (isset($this->viewConfigs[$key])) {
                return $this->viewConfigs[$key];
            }
            $viewConfigParams['themeModel'] = $currentTheme;
        }
        $viewConfigParams['area'] = (isset($params['area'])) ? $params['area'] : null;

        $config = $this->viewConfigFactory->create($viewConfigParams);

        if (isset($key)) {
            $this->viewConfigs[$key] = $config;
        }
        return $config;
    }
}