DocReader.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\GraphQlSchemaStitching\GraphQlReader\MetaReader;

class DocReader
{
    public function read(\GraphQL\Language\AST\NodeList $directives) : string
    {
        foreach ($directives as $directive) {
            if ($directive->name->value == 'doc') {
                foreach ($directive->arguments as $directiveArgument) {
                    if ($directiveArgument->name->value == 'description') {
                        return $directiveArgument->value->value;
                    }
                }
            }
        }
        return '';
    }
}