<?php

namespace Composer\Downloader;

use Composer\Package\PackageInterface;

/**
 * VCS Capable Downloader interface.
 *
 * @author Steve Buzonas <steve@fancyguy.com>
 */
interface VcsCapableDownloaderInterface
{
    /**
     * Gets the VCS Reference for the package at path
     *
     * @param  PackageInterface $package package directory
     * @param  string           $path    package directory
     * @return string|null      reference or null
     */
    public function getVcsReference(PackageInterface $package, string $path): ?string;
}
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