next-ai-draw-io/app/api/chat/route.ts

import { google } from "@ai-sdk/google";
import { streamText } from "ai";

export const maxDuration = 30;

export async function POST(req: Request) {
  const { messages } = await req.json();
  const result = streamText({
    model: google("gemini-2.0-flash"),
    messages,
  });
  return result.toDataStreamResponse();
}