vendor/illuminate/support/Composer.php

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<?php

namespace Illuminate\Support;

use Illuminate\Filesystem\Filesystem;
use Symfony\Component\Process\Process;
use Symfony\Component\Process\PhpExecutableFinder;

class Composer
{
    /**
     * The filesystem instance.
     *
     * @var \Illuminate\Filesystem\Filesystem
     */
    protected $files;

    /**
     * The working path to regenerate from.
     *
     * @var string|null
     */
    protected $workingPath;

    /**
     * Create a new Composer manager instance.
     *
     * @param  \Illuminate\Filesystem\Filesystem  $files
     * @param  string|null  $workingPath
     * @return void
     */
    public function __construct(Filesystem $files, $workingPath = null)
    {
        $this->files = $files;
        $this->workingPath = $workingPath;
    }

    /**
     * Regenerate the Composer autoloader files.
     *
     * @param  string|array  $extra
     * @return void
     */
    public function dumpAutoloads($extra = '')
    {
        $extra = $extra ? (array) $extra : [];

        $command = array_merge($this->findComposer(), ['dump-autoload'], $extra);

        $this->getProcess($command)->run();
    }

    /**
     * Regenerate the optimized Composer autoloader files.
     *
     * @return void
     */
    public function dumpOptimized()
    {
        $this->dumpAutoloads('--optimize');