import type { InferUITool, UIMessage } from "ai";import { z } from "zod";import type { ArtifactKind } from "@/components/chat/artifact";import type { createDocument } from "./ai/tools/create-document";import type { getWeather } from "./ai/tools/get-weather";import type { requestSuggestions } from "./ai/tools/request-suggestions";import type { updateDocument } from "./ai/tools/update-document";import type { Suggestion } from "./db/schema"; export const messageMetadataSchema = z.object({  createdAt: z.string(),}); export type MessageMetadata = z.infer<typeof messageMetadataSchema>; type weatherTool = InferUITool<typeof getWeather>;type createDocumentTool = InferUITool<ReturnType<typeof createDocument>>;type updateDocumentTool = InferUITool<ReturnType<typeof updateDocument>>;type requestSuggestionsTool = InferUITool<  ReturnType<typeof requestSuggestions>>; export type ChatTools = {  getWeather: weatherTool;  createDocument: createDocumentTool;  updateDocument: updateDocumentTool;  requestSuggestions: requestSuggestionsTool;}; export type CustomUIDataTypes = {  textDelta: string;  imageDelta: string;  sheetDelta: string;  codeDelta: string;  suggestion: Suggestion;  appendMessage: string;  id: string;  title: string;  kind: ArtifactKind;  clear: null;  finish: null;  "chat-title": string;}; export type ChatMessage = UIMessage<  MessageMetadata,  CustomUIDataTypes,  ChatTools>; export type Attachment = {  name: string;  url: string;  contentType: string;};