vercel-ai-sdk-durable-transport

AI SDK, Next.js, and OpenAI Chat Example

This example shows how to use the Vercel AI SDK with Next.js and OpenAI streaming chat demo with the Durable Streams transport.

The key code is in app/page.tsx:

import { useEffect } from 'react'
import { useChat } from '@ai-sdk/react'
import { durableTransport } from '@durable-streams/ai-transport'

const { durableSession, initialMessages } = durableTransport(
  `demo`,
  { proxyUrl },
  { api: `/api/chat` }
)

export default function Chat() {
  const { error, status, sendMessage, messages, setMessages, regenerate, stop } = useChat({
    ...durableSession
  })

  useEffect(() => setMessages(initialMessages), [setMessages])

  // ...
}

This configures the default useChat hook to use a durable transport adapter with local message persistence. It supports persistent chat history, resumability of active generations and tolerates tab backgrounding and patchy network connectivity.

It doesn't demonstrate server-side message persistence (only the raw active generation streams are persistent) and it doesn't work with multi-tab or multi-user.