public function getContents(): string
    {
        set_error_handler(function ($type, $msg) use (&$error) { $error = $msg; });
        try {
            $content = file_get_contents($this->getPathname());
        } finally {
            restore_error_handler();
        }
        if (false === $content) {
            throw new \RuntimeException($error);
        }

        return $content;
    }