Codes.php

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<?php
namespace Magento\Framework\Locale\Deployed;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Filesystem;
use Magento\Framework\Locale\AvailableLocalesInterface;
use Magento\Framework\View\Design\Theme\FlyweightFactory;
use Magento\Framework\View\DesignInterface;

class Codes implements AvailableLocalesInterface
{
    private $fileSystem;

    private $flyweightFactory;

    public function __construct(
        FlyweightFactory $flyweightFactory,
        Filesystem $fileSystem
    ) {
        $this->fileSystem = $fileSystem;
        $this->flyweightFactory = $flyweightFactory;
    }

    public function getList($code, $area = DesignInterface::DEFAULT_AREA)
    {
        try {
            $theme = $this->flyweightFactory->create($code, $area);
            $reader = $this->fileSystem->getDirectoryRead(DirectoryList::STATIC_VIEW);
            $dirs = $reader->read($theme->getFullPath());
        } catch (\Exception $e) {
            return [];
        }

        return array_map('basename', $dirs);
    }
}