private function configureDirs()
    {
        // Configure dirs from environment variables and composer extra values.
        foreach ($this->resolver->names() as $name) {
            $default = $this->resolver->raw($name);
            $path = $this->options->get($name . '-dir', $default);
            if ($path !== $default) {
                $this->verbose("Setting <info>$name</> path to <info>$path</>.");
                $this->resolver->define($name, $path);
            }
        }

        if ($this->io->confirm("Do you want to use Bolt's standard folder structure?")) {
            return;
        }

        (new PathCustomizer($this->resolver, $this->io))->run();

        $this->io->writeln("\n<info>Customizing!</info>\n");
    }