Dynamic XML Sitemaps and Robots Configuration

1// app/sitemap.ts
2import { MetadataRoute } from 'next';
3
4export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
5  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'https://faangprep.com';
6
7  // 1. Static marketing routes
8  const staticRoutes: MetadataRoute.Sitemap = [
9    {
10      url: baseUrl,
11      lastModified: new Date(),
12      changeFrequency: 'daily',
13      priority: 1.0,
14    },
15    {
16      url: `${baseUrl}/nextjs`,
17      lastModified: new Date(),
18      changeFrequency: 'weekly',
19      priority: 0.9,
20    },
21  ];
22
23  // 2. Dynamic content routes fetched from CMS/DB
24  const lessons = await fetch('https://api.cms.com/lessons').then(res => res.json());
25  const lessonRoutes: MetadataRoute.Sitemap = lessons.map((l: any) => ({
26    url: `${baseUrl}/nextjs/${l.category}/${l.slug}`,
27    lastModified: new Date(l.updatedAt),
28    changeFrequency: 'monthly',
29    priority: 0.8,
30  }));
31
32  return [...staticRoutes, ...lessonRoutes];
33}