Add sitemap generation

sitemap.mjs

@@ -0,0 +1,54 @@
+import path from 'node:path';
+import fs from 'node:fs/promises';
+
+async function getRoadmapIds() {
+  return fs.readdir(path.join(process.cwd(), 'src/roadmaps'));
+}
+
+export function shouldIndexPage(page) {
+  return ![
+    'https://roadmap.sh/404/',
+    'https://roadmap.sh/terms/',
+    'https://roadmap.sh/privacy/',
+  ].includes(page);
+}
+
+export async function serializeSitemap(item) {
+  const highPriorityPages = [
+    'https://roadmap.sh/',
+    'https://roadmap.sh/about/',
+    'https://roadmap.sh/roadmaps/',
+    'https://roadmap.sh/guides/',
+    'https://roadmap.sh/videos/',
+    ...(await getRoadmapIds()).map((id) => `https://roadmap.sh/${id}/`),
+  ];
+
+  // Roadmaps and other high priority pages
+  for (let pageUrl of highPriorityPages) {
+    if (item.url === pageUrl) {
+      return {
+        ...item,
+        // @ts-ignore
+        changefreq: 'monthly',
+        priority: 1,
+        lastmod: new Date().toISOString(),
+      };
+    }
+  }
+
+  // Guide and video pages
+  if (
+    item.url.startsWith('https://roadmap.sh/guides/') ||
+    item.url.startsWith('https://roadmap.sh/videos/')
+  ) {
+    return {
+      ...item,
+      // @ts-ignore
+      changefreq: 'monthly',
+      priority: 0.9,
+      lastmod: new Date().toISOString(),
+    };
+  }
+
+  return undefined;
+}