refined design

app/sitemap.ts

@@ -0,0 +1,61 @@
+// app/sitemap.ts
+import { getAllTags, getSortedPostsData } from '@/lib/posts';
+import { MetadataRoute } from 'next';
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const baseUrl = 'https://steffenillium.de';
+
+  // Improvement 1: Fetch all posts with a single, more efficient call
+  const allPosts = getSortedPostsData();
+  const postUrls: MetadataRoute.Sitemap = allPosts.map((post) => ({
+    url: `${baseUrl}/${post.href}`,
+    lastModified: new Date(post.date),
+    changeFrequency: 'yearly',
+    priority: 0.7,
+  }));
+
+
+  const allTags = getAllTags(2);
+  const tagUrls: MetadataRoute.Sitemap = allTags.map((tag) => ({
+    url: `${baseUrl}/tags/${tag.name}`,
+    lastModified: new Date(),
+    changeFrequency: 'monthly',
+    priority: 0.5,
+  }));
+
+  // The types for changeFrequency and lastModified will now be correctly inferred
+  const staticRoutes: MetadataRoute.Sitemap = [
+    {
+      url: baseUrl,
+      lastModified: new Date(),
+      priority: 1,
+      changeFrequency: 'monthly',
+    },
+    {
+      url: `${baseUrl}/experience`,
+      lastModified: new Date(),
+      priority: 0.8,
+      changeFrequency: 'monthly',
+    },
+    {
+      url: `${baseUrl}/research`,
+      lastModified: new Date(),
+      priority: 0.9,
+      changeFrequency: 'yearly',
+    },
+    {
+      url: `${baseUrl}/publications`,
+      lastModified: new Date(),
+      priority: 0.9,
+      changeFrequency: 'yearly',
+    },
+    {
+      url: `${baseUrl}/tags`,
+      lastModified: new Date(),
+      priority: 0.7,
+      changeFrequency: 'monthly',
+    },
+  ];
+
+  return [...staticRoutes, ...postUrls, ...tagUrls];
+}