Sitemap generation GetServerSideProps

getServerSideProps.tsx

import { GetServerSideProps } from 'next';
import fs from 'fs';
import path from 'path';

export default function Sitemap() {}

type Url = {
  host: string;
  route: string;
  date?: Date;
};

const excludedRoutes: Array<string> = ['/sitemap', '/404'];

export const getServerSideProps: GetServerSideProps = async ({ res }) => {
  const basePath: string = process.cwd();
  const routes_manifest: object = ReadManifestFile(basePath);
  const host: string = "https://example.com"

  let routes: Array<Url> = GetPathsFromManifest(routes_manifest, host);
  const pagesPath = path.join(basePath + '/.next/server/pages/');
  routes = routes.concat(GetPathsFromBuildFolder(pagesPath, [], host, pagesPath));

  routes = routes.filter((el) => !excludedRoutes.includes(el.route));
  const sitemap: string = GetSitemapXml(routes);

  res.setHeader('Content-Type', 'text/xml');
  res.write(sitemap);
  res.end();
  return { props: {} };
};