Reading the manifest file.

readmanifest.tsx

const ReadManifestFile = (basePath: string): object => {
  const routes_manifest_path = path.join(basePath + '/.next/server/pages-manifest.json');

  // Read from the file
  if (fs.existsSync(routes_manifest_path)) {
    const raw_json = fs.readFileSync(routes_manifest_path);
    return JSON.parse(raw_json.toString());
  } else return null;
};