lib/promise-adapter/src/Adapter/GuzzleHttpPromiseAdapter.php
public function createAll($promisesOrValues)
    {
        $promise = empty($promisesOrValues) ? $this->createFulfilled($promisesOrValues) : \GuzzleHttp\Promise\all($promisesOrValues);

        return $promise;
    }
public function createAll($promisesOrValues)
    {
        $promise = empty($promisesOrValues) ? $this->createFulfilled($promisesOrValues) : \GuzzleHttp\Promise\all($promisesOrValues);

        return $promise;
    }
{@inheritdoc}

@return Promise