View file core/libs/s3/vendor/composer/installers/src/Composer/Installers/LavaLiteInstaller.php

<?php
namespace Composer\Installers;

class LavaLiteInstaller extends BaseInstaller
{
    protected $locations = array(
        'package' => 'packages/{$vendor}/{$name}/',
        'theme'   => 'public/themes/{$name}/',
    );
}