BundleConfig.php

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<?php
namespace Magento\Deploy\Config;

use Magento\Framework\View;
use Magento\Framework\View\Design\Theme\ThemeProviderInterface;

class BundleConfig
{
    const VIEW_CONFIG_MODULE = 'Js_Bundle';

    const VIEW_CONFIG_BUNDLE_SIZE_NAME = 'bundle_size';

    private $viewConfig;

    private $themeProvider;

    private $config = [];

    public function __construct(
        View\ConfigInterface $viewConfig,
        ThemeProviderInterface $themeProvider
    ) {
        $this->viewConfig = $viewConfig;
        $this->themeProvider = $themeProvider;
    }

    public function getBundleFileMaxSize($area, $theme)
    {
        $size = $this->getConfig($area, $theme)->getVarValue(
            self::VIEW_CONFIG_MODULE,
            self::VIEW_CONFIG_BUNDLE_SIZE_NAME
        );
        $unit = preg_replace('/[^a-zA-Z]+/', '', $size);
        $unit = strtoupper($unit);
        switch ($unit) {
            case 'KB':
                return (int)$size;
            case 'MB':
                return (int)$size * 1024;
            default:
                return (int)($size / 1024);
        }
    }

    public function getExcludedDirectories($area, $theme)
    {
        return $this->getConfig($area, $theme)->getExcludedDir();
    }

    public function getExcludedFiles($area, $theme)
    {
        return $this->getConfig($area, $theme)->getExcludedFiles();
    }

    private function getConfig($area, $theme)
    {
        $themePath = $area . '/' . $theme;
        if (!isset($this->config[$themePath])) {
            $this->config[$themePath] = $this->viewConfig->getViewConfig([
                'area' => $area,
                'themeModel' => $this->themeProvider->getThemeByFullPath($themePath)
            ]);
        }
        return $this->config[$themePath];
    }
}