# DuplexStream

> **Function** in `langgraph`

📖 [View in docs](https://reference.langchain.com/python/langgraph/pregel/_loop/DuplexStream)

## Signature

```python
DuplexStream(
    *streams: StreamProtocol = (),
) -> StreamProtocol
```

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[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/0a26b471d34da94186bee8c48d0c463b5a3bd0a0/libs/langgraph/langgraph/pregel/_loop.py#L139)