Primary.php

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<?php
namespace Magento\Framework\App\Arguments\FileResolver;

use Magento\Framework\App\Filesystem\DirectoryList;

class Primary implements \Magento\Framework\Config\FileResolverInterface
{
    protected $configDirectory;

    protected $iteratorFactory;

    public function __construct(
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Framework\Config\FileIteratorFactory $iteratorFactory
    ) {
        $this->configDirectory = $filesystem->getDirectoryRead(DirectoryList::CONFIG);
        $this->iteratorFactory = $iteratorFactory;
    }

    public function get($filename, $scope)
    {
        $configPaths = $this->configDirectory->search('{*' . $filename . ',*/*' . $filename . '}');
        $configAbsolutePaths = [];
        foreach ($configPaths as $configPath) {
            $configAbsolutePaths[] = $this->configDirectory->getAbsolutePath($configPath);
        }
        return $this->iteratorFactory->create($configAbsolutePaths);
    }
}