ComposerJsonFinder.php

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<?php
namespace Magento\Framework\Composer;

use Magento\Framework\App\Filesystem\DirectoryList;

class ComposerJsonFinder
{
    private $directoryList;

    public function __construct(DirectoryList $directoryList)
    {
        $this->directoryList = $directoryList;
    }

    public function findComposerJson()
    {
        $composerJson = $this->directoryList->getPath(DirectoryList::ROOT) . '/composer.json';

        $composerJson = realpath($composerJson);

        if ($composerJson === false) {
            throw new \Exception('Composer file not found');
        }

        return $composerJson;
    }
}