Deploy Slack's Bolt.js to Vercel with @vercel/slack-bolt

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import { App } from "@slack/bolt";
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import { generateText } from "ai";
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import { VercelReceiver, createHandler } from "@vercel/slack-bolt";
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const receiver = new VercelReceiver();
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const app = new App({
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  token: process.env.SLACK_BOT_TOKEN,
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  signingSecret: process.env.SLACK_SIGNING_SECRET,
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  receiver,
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  deferInitialization: true,
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});
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// listening to Slack messages
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app.event("message", async ({ say, message }) => {
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  const { text } = await generateText({
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    model: "openai/gpt-5",
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    prompt: `Respond to the user's message: ${message.text}`,
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  });
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  // responding to Slack
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  await say(text);
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});
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export const POST = createHandler(app, receiver);