vercel-ai-sdklisted

# Vercel AI SDK The Vercel AI SDK provides React hooks and server utilities for building streaming chat interfaces with support for tool calls, file attachments, and multi-step reasoning. ## Quick Reference ### Basic useChat Setup ```typescript import { useChat } from '@ai-sdk/react'; const { messages, status, sendMessage, stop, regenerate } = useChat({ id: 'chat-id', messages: initialMessages, onFinish: ({ message, messages, isAbort, isError }) => { console.log('Chat finished'); }, onError: (error) => { console.error('Chat error:', error); } }); // Send a message sendMessage({ text: 'Hello', metadata: { createdAt: Date.now() } }); // Send with files sendMessage({ text: 'Analyze this', files: fileList // FileList or FileUIPart[] }); ``` ### ChatStatus States The `status` field indicates the current state of the chat: - **`ready`**: Chat is idle and ready to accept new messages - **`submitted`**: Message sent to API, awaiting response stream start - **`streaming`**: Response actively streaming from the API - **`error`**: An error occurred during the request ### Message Structure Messages use the `UIMessage` type with a parts-based structure: ```typescript interface UIMessage { id: string; role: 'system' | 'user' | 'assistant'; metadata?: unknown; parts: Array<UIMessagePart>; // text, file, tool-*, reasoning, etc. } ``` Part types include: - `text`: Text content with optional streaming state - `file`: File attachments (images, docum