Do I need to run postbuild step if I have server generated sitemap?

[alexandros-megas]

I'm in the process of upgrading the version of NextJS I'm using, and running into the following error with the "postbuild": "next-sitemap" step:

$ cross-env next-sitemap
 ❌ [next-sitemap] Unable to find export-maker.
Make sure to build the project using `next build` command

node:internal/process/promises:279
            triggerUncaughtException(err, true /* fromPromise */);
            ^

[Error: ENOENT: no such file or directory, stat '/app/.next/export-marker.json'] {
  errno: -2,
  code: 'ENOENT',
  syscall: 'stat',
  path: '/app/.next/export-marker.json'
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

The postbuild step was setup by someone who is no longer with our team, so I wonder if I even need this, since our project also has the following in pages/server-sitemap.xml.tsx:

export const getServerSideProps: GetServerSideProps = async (ctx) => {
  return getServerSideSitemap(ctx, [...]);
};

// Default export to prevent next.js errors
export default (): void => {};

If not, I can get around the error by simply removing the postbuild step.

[iamvishnusankar]

@alexandros-megas No, you don't need postbuild script if your use case is only server side sitemap generation.