Kraken\Filesystem\FilesystemManager::isFile PHP Method

    public function isFile($path)
    {
        list($prefix, $path) = $this->filterPrefix($path);
        if (($fs = $this->getFilesystem($prefix)) === null) {
            throw new ReadException("No filesystem saved under prefix [{$prefix}].");
        }
        return $fs->isFile($path);
    }