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Throttle onUpdate to 50ms #2182

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Throttle onUpdate to 50ms #2182

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11 changes: 7 additions & 4 deletions packages/react/src/use-chat.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ import {
} from '@ai-sdk/ui-utils';
import { useCallback, useEffect, useId, useRef, useState } from 'react';
import useSWR, { KeyedMutator } from 'swr';
import { throttle } from 'lodash';

export type { CreateMessage, Message, UseChatOptions };

Expand Down Expand Up @@ -129,6 +130,11 @@ const getStreamedResponse = async (
}),
);

const onUpdate = throttle((merged, data) => {
mutate([...chatRequest.messages, ...merged], false);
mutateStreamData([...(existingData || []), ...(data || [])], false);
}, 50);

return await callChatApi({
api,
body: experimental_prepareRequestBody?.({
Expand Down Expand Up @@ -164,10 +170,7 @@ const getStreamedResponse = async (
mutate(previousMessages, false);
},
onResponse,
onUpdate(merged, data) {
mutate([...chatRequest.messages, ...merged], false);
mutateStreamData([...(existingData || []), ...(data || [])], false);
},
onUpdate,
onToolCall,
onFinish,
generateId,
Expand Down