[HOW TO?] Call trpc endpoints from vanilla nextJs api routes

import { NextApiRequest, NextApiResponse } from "next";
import { appRouter } from "@acme/api";
import { getHTTPStatusCodeFromError } from "@trpc/server/http";
import { TRPCError } from "@trpc/server";

const handler = async (req: NextApiRequest, res: NextApiResponse) => {
  const caller = appRouter.createCaller({});

  try {
    const result = await caller.post.all();
    res.status(200).json(result);
  } catch (e) {
    console.error(e);
    const code = e instanceof TRPCError ? getHTTPStatusCodeFromError(e) : 500;
    res.status(code).json({ error: e });
  }
};

export default handler;