src/Composer/Console/Application.php
public function run(InputInterface $input = null, OutputInterface $output = null)
    {
        if (null === $output) {
            $output = Factory::createOutput();
        }

        return parent::run($input, $output);
    }
public function run(InputInterface $input = null, OutputInterface $output = null)
    {
        if (null === $output) {
            $output = Factory::createOutput();
        }

        return parent::run($input, $output);
    }
{@inheritDoc}