Feat(sitemap): add external url (nodejs#5821)

* Chore(next-const): add EXTERNAL_LINKS_SITMAP

* add more descripton

* Update sitemap.ts

* update from feedback

* Update sitemap.ts

app/sitemap.ts

@@ -5,6 +5,7 @@ import {
   DYNAMIC_GENERATED_ROUTES,
   BASE_PATH,
   BASE_URL,
+  EXTERNAL_LINKS_SITEMAP,
 } from '@/next.constants.mjs';
 import type { MetadataRoute } from 'next';
 
@@ -27,9 +28,12 @@ const sitemap = (): MetadataRoute.Sitemap => {
   // The current date of this request
   const currentDate = new Date().toISOString();
 
-  // This maps the URL routes into Sitemap entries
-  return [...dynamicRoutes, ...staticPaths].sort().map(route => ({
-    url: `${baseUrlAndPath}/${route}`,
+  const appRoutes = [...dynamicRoutes, ...staticPaths]
+    .sort()
+    .map(route => `${baseUrlAndPath}/${route}`);
+
+  return [...appRoutes, ...EXTERNAL_LINKS_SITEMAP].map(route => ({
+    url: route,
     lastModified: currentDate,
     changeFrequency: 'always',
   }));

next.constants.mjs

@@ -139,3 +139,17 @@ export const DYNAMIC_ROUTES_REWRITES = [
 export const DYNAMIC_GENERATED_ROUTES = () => [
   ...blogData.pagination.map(year => `en/blog/year-${year}`),
 ];
+
+/***
+ * This is a list of all external links that are used on website sitemap.
+ * @see https://github.com/nodejs/nodejs.org/issues/5813 for more context
+ */
+export const EXTERNAL_LINKS_SITEMAP = [
+  'https://terms-of-use.openjsf.org/',
+  'https://privacy-policy.openjsf.org/',
+  'https://bylaws.openjsf.org/',
+  'https://code-of-conduct.openjsf.org/',
+  'https://trademark-policy.openjsf.org/',
+  'https://trademark-list.openjsf.org/',
+  'https://www.linuxfoundation.org/cookies',
+];