PhpCsFixer\Config::setFinder PHP Method

    public function setFinder($finder)
    {
        if (false === is_array($finder) && false === $finder instanceof \Traversable) {
            throw new \InvalidArgumentException(sprintf('Argument must be an array or a Traversable, got "%s".', is_object($finder) ? get_class($finder) : gettype($finder)));
        }
        $this->finder = $finder;
        return $this;
    }