Kraken\Promise\PromiseFulfilled::done PHP Method

    public function done(callable $onFulfilled = null, callable $onRejected = null, callable $onCancel = null)
    {
        if (null === $onFulfilled) {
            return;
        }
        $result = $onFulfilled($this->getValue());
        if ($result instanceof PromiseInterface) {
            $result->done();
        }
    }