ConfigurationScanner.php

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<?php
namespace Magento\Setup\Module\Di\Code\Scanner;

use Magento\Framework\App\Area;

class ConfigurationScanner
{
    public function __construct(
        \Magento\Framework\App\Config\FileResolver $fileResolver,
        \Magento\Framework\App\AreaList $areaList
    ) {
        $this->fileResolver = $fileResolver;
        $this->areaList = $areaList;
    }

    public function scan($fileName)
    {
        $files = [];
        $areaCodes = array_merge(
            ['primary', Area::AREA_GLOBAL],
            $this->areaList->getCodes()
        );
        foreach ($areaCodes as $area) {
            $files = array_merge_recursive(
                $files,
                $this->fileResolver->get($fileName, $area)->toArray()
            );
        }
        return array_keys($files);
    }
}