public function debuggees(array $extras = [])
    {
        $res = $this->connection->listDebuggees(['project' => $this->projectId] + $extras);
        if (is_array($res) && array_key_exists('debuggees', $res)) {
            return array_map(function ($info) {
                return new Debuggee($this->connection, $info);
            }, $res['debuggees']);
        }
        return [];
    }