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docs(sdk-js): improve resumability docs

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Tat Dat Duong
2025-06-02 02:09:43 +02:00
parent 624c688013
commit 5973fcb0ae
1 changed files with 4 additions and 4 deletions
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docs/docs/cloud/how-tos/use_stream_react.md
+4 -4
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@@ -115,7 +115,7 @@ export default function App() {
### Resume a stream after page refresh
The `useStream()` hook can automatically resume an already ongoing run on mount by passing `reconnectOnMount: true`. This is useful for resuming an ongoing stream after a full page refresh without losing any messages that were generated in the meantime.
The `useStream()` hook can automatically resume an ongoing run upon mounting by setting `reconnectOnMount: true`. This is useful for continuing a stream after a page refresh, ensuring no messages and events generated during the downtime are lost.
```tsx
const thread = useStream<{ messages: Message[] }>({
@@ -125,7 +125,7 @@ const thread = useStream<{ messages: Message[] }>({
});
```
By default the ID of the created run is stored in `window.sessionStorage` under `lg:stream:${threadId}` key. This can be swapped by passing a custom storage in `reconnectOnMount`.
By default the ID of the created run is stored in `window.sessionStorage`, which can be swapped by passing a custom storage in `reconnectOnMount` instead. The storage is used to persist the in-flight run ID for a thread (under `lg:stream:${threadId}` key).
```tsx
const thread = useStream<{ messages: Message[] }>({
@@ -135,7 +135,7 @@ const thread = useStream<{ messages: Message[] }>({
});
```
Finally, you can manually handle the lifecycle of stream resuming by using the run callbacks and `joinStream` method. Make sure to pass `streamResumable: true` and `onDisconnect: "continue"` when creating the run.
You can also manually manage the resuming process by using the run callbacks to persist the run metadata and the `joinStream` function to resume the stream. Make sure to pass `streamResumable: true` when creating the run; otherwise some events might be lost.
````tsx
import type { Message } from "@langchain/langgraph-sdk";
@@ -186,7 +186,7 @@ export default function App() {
>
<div>
{thread.messages.map((message) => (
<div key={message.id}>{JSON.stringify(message.content)}</div>
<div key={message.id}>{message.content as string}</div>
))}
</div>
<input type="text" name="message" />