ModularConfigSource.php

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<?php
namespace Magento\Config\App\Config\Source;

use Magento\Framework\App\Config\ConfigSourceInterface;
use Magento\Framework\DataObject;
use Magento\Framework\App\Config\Initial\Reader;

class ModularConfigSource implements ConfigSourceInterface
{
    private $reader;

    public function __construct(Reader $reader)
    {
        $this->reader = $reader;
    }

    public function get($path = '')
    {
        $data = new DataObject($this->reader->read());
        if ($path !== '') {
            $path = '/' . $path;
        }
        return $data->getData('data' . $path) ?: [];
    }
}