tanstack-ai

@octanejs/tanstack-ai

TanStack AI bindings for the Octane UI framework.

This package ports @tanstack/ai-react@0.17.0 onto Octane while reusing @tanstack/ai and @tanstack/ai-client unchanged. The runtime export surface matches the React adapter, so migration starts by changing the package import:

// before
import { useChat } from '@tanstack/ai-react'

// after
import { useChat } from '@octanejs/tanstack-ai'

The renderer-bearing hook modules are authored as .tsrx and compiled by Octane. Matching .tsrx.d.ts companions are checked declaration emits of those implementations, preserving the complete generic surface for TypeScript consumers.

Install

pnpm add @octanejs/tanstack-ai @tanstack/ai @tanstack/ai-client octane

Usage

import { useState } from 'octane'
import { useChat } from '@octanejs/tanstack-ai'

export function Chat() @{
  const [input, setInput] = useState('')
  const chat = useChat({
    fetcher: myFetcher,
  })

  <div>
    @for (const message of chat.messages; key message.id) {
      <p>
        {(message.role +
          ': ' +
          message.parts
            .map((part) => (part.type === 'text' ? part.content : ''))
            .join('')) as string}
      </p>
    }
    <input
      value={input}
      onInput={(event) => setInput(event.currentTarget.value)}
    />
    <button
      onClick={() => {
        void chat.sendMessage(input)
        setInput('')
      }}
    >
      Send
    </button>
  </div>
}

useChat has no input state of its own — hold the text box value in a local useState and pass it to sendMessage. Note the onInput handler: Octane drives text controls per keystroke through the native input event, not a synthetic onChange.

API

The adapter includes useChat, useRealtimeChat, useMcpAppBridge, useGeneration, useGenerateImage, useGenerateAudio, useGenerateSpeech, useGenerateVideo, useTranscription, useSummarize, and useAudioRecorder. It also re-exports all 30 @tanstack/ai-client convenience helpers and types (fetchServerSentEvents, fetchHttpStream, xhrServerSentEvents, xhrHttpStream, stream, rpcStream, createChatClientOptions, createMcpAppBridge, and their associated types) unchanged, mirroring the upstream @tanstack/ai-react index.

Server rendering through octane/server is supported. useChat renders its initial message snapshot without browser-only setup.

Divergences from @tanstack/ai-react

• The ./mcp-apps subpath and its MCPAppResource component are not ported: they render AppRenderer from the React-only @mcp-ui/client, which has no Octane equivalent. The framework-agnostic useMcpAppBridge hook is ported and available on the main entry.
• Octane uses native events: text/file/recorder inputs drive updates via onInput; there is no synthetic onChange layer.
• Octane has no StrictMode double-invoke and always provides useId, so no random-id fallback is needed.
• Realtime reconnects and token refreshes use the latest getToken and adapter supplied to the hook; upstream captures the first render's callbacks.
• The declared realtime onStatusChange callback is invoked alongside the hook's state update; upstream 0.17.0 currently drops the external callback.
• One upstream useChat test case ("auto-resume on mount / when the browser comes back online") is omitted: it targets ChatClient.prototype.maybeAutoResume, an API absent from the pinned (and latest published) @tanstack/ai-client@0.21.0 and never invoked by useChat. It is untestable in this binding until that dependency ships the method.

Verification

The port runs TanStack AI's React adapter tests against Octane across all eleven hooks, with no skipped, todo, or expected-failure cases (except the untestable auto-resume case above). A differential test compiles a shared chat fixture for Octane and React and compares streamed output after each step; output is byte-equal against real @tanstack/ai-react@0.17.0. An SSR fixture and the upstream compile-time type tests are also included.

Current scope and verification status are tracked in the generated bindings status table, sourced from this package's status.json.

License

MIT — contains source derived from TanStack AI (MIT), adapted for Octane.