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Separate Text Parts with Merged Streams in processChatResponse #5435

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BrianHung opened this issue Mar 28, 2025 · 1 comment
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Separate Text Parts with Merged Streams in processChatResponse #5435

BrianHung opened this issue Mar 28, 2025 · 1 comment
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ai/ui enhancement New feature or request

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@BrianHung
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Feature Description

I'm merging data streams of individual streamTexts to enable a multi-step workflow.
https://x.com/aisdk/status/1896946680081302007

Right now, the behavior of processChatResponse is to accumulate the text parts and reasoning text parts of separate streams into the same part.

So for multiple streams, parts would always be [TextPart, ToolCallPart, ToolCallPart].

What I'm looking for is, [TextPart, ToolCallPart, TextPart, ToolCallPart].

Use Cases

With merged streams, we want to keep the text interweaved and not accumulate.

Before

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After

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Additional context

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@BrianHung BrianHung added the enhancement New feature or request label Mar 28, 2025
@BrianHung BrianHung mentioned this issue Mar 28, 2025
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@lgrammel lgrammel added the ai/ui label Mar 29, 2025
@BrianHung
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Turns out latest version of vercel ai already has this implemented here:
https://github.com/vercel/ai/blame/4dece70cbc9606ea0c0c7921b10f43b8cce96791/packages/ui-utils/src/process-chat-response.ts#L361-L364

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@lgrammel @BrianHung