Common/Model/NotificationTypes.php
static public function isValidType($type, $throw = true)
    {
        if (in_array($type, static::getTypes(), true)) {
            return true;
        }

        if ($throw) {
            throw new InvalidArgumentException('Invalid notification type.');
        }

        return false;
    }
static public function isValidType($type, $throw = true)
    {
        if (in_array($type, static::getTypes(), true)) {
            return true;
        }

        if ($throw) {
            throw new InvalidArgumentException('Invalid notification type.');
        }

        return false;
    }
Returns whether the given type is valid or not.

@param string $type
@param bool   $throw

@return bool