Hi, im attempting to implement vercel cron into my nextjs project. To secure my API route (pages directory), I am following this snippet: https://vercel.com/docs/cron-jobs/manage-cron-jobs#securing-cron-jobs

however using this code I get a typescript error:

Cannot invoke an object which is possibly 'undefined'.ts(2722)
'req.headers.get' is possibly 'undefined'.ts(18048)
This expression is not callable.
  No constituent of type 'string | string[]' is callable.ts(2349)
string | string[] | undefined

Here is the relevent code:

import { addMeetingInAnHourEvent } from "@/slices/event/services";
import type { NextApiRequest, NextApiResponse } from "next";

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  // ignore possibly undefined error as header is guaranteed according to docs: https://vercel.com/docs/cron-jobs/manage-cron-jobs#securing-cron-jobs

  const authHeader = req.headers.get("authorization");
  if (
    !process.env.CRON_SECRET ||
    authHeader !== `Bearer ${process.env.CRON_SECRET}`
  ) {
    return res.status(401).json({ message: "Unauthorized", success: false });
  }

  if (req.method !== "GET") {
    return res.status(403).json({ message: "method must be GET" });
  }

  return res.status(200).json({ message: "success" });
}

I just want to confirm: can I assume the the cron secret will always be included as a header?