Equip\Responder\FormattedResponder::assertValid PHP Метод

    protected function assertValid(array $classes)
    {
        parent::assertValid($classes);
        foreach ($classes as $formatter => $quality) {
            if (!is_subclass_of($formatter, FormatterInterface::class)) {
                throw FormatterException::invalidClass($formatter);
            }
            if (!is_float($quality)) {
                throw FormatterException::needsQuality($formatter);
            }
        }
    }