InitialConfigSource.php

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

use Magento\Framework\App\DeploymentConfig\Reader;
use Magento\Framework\DataObject;

class InitialConfigSource implements ConfigSourceInterface
{
    private $reader;

    private $configType;

    private $fileKey;

    public function __construct(Reader $reader, $configType, $fileKey = null)
    {
        $this->reader = $reader;
        $this->configType = $configType;
        $this->fileKey = $fileKey;
    }

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