Platformsh\Cli\Local\Toolstack\Composer::build PHP Метод

    public function build()
    {
        $buildDir = $this->copyToBuildDir();
        // The composer.json file may not exist at this stage, if the user has
        // manually specified a Composer toolstack (e.g. php:symfony).
        if (file_exists($buildDir . '/composer.json')) {
            $this->output->writeln("Found a composer.json file; installing dependencies");
            $args = [$this->shellHelper->resolveCommand('composer'), 'install', '--no-progress', '--prefer-dist', '--optimize-autoloader', '--no-interaction', '--no-ansi'];
            if ($this->output->getVerbosity() >= OutputInterface::VERBOSITY_DEBUG) {
                $args[] = '-vvv';
            } elseif ($this->output->getVerbosity() >= OutputInterface::VERBOSITY_VERY_VERBOSE) {
                $args[] = '-vv';
            } elseif ($this->output->getVerbosity() >= OutputInterface::VERBOSITY_VERBOSE) {
                $args[] = '-v';
            }
            $this->shellHelper->execute($args, $buildDir, true, false);
        }
        $this->processSpecialDestinations();
    }