feat: add sitemap generation for static, docs, and blog routes

src/app/sitemap.ts

@@ -0,0 +1,58 @@
+import fs from "fs";
+import path from "path";
+import { MetadataRoute } from "next";
+import { docsCollection } from "@/docs-collection";
+import { getAllPostFileNames, postFileNameToPath } from "@/blog-helpers";
+import docsConfig from "../../docs-config";
+
+export const dynamic = "force-static";
+
+function getStaticAppRoutes(): string[] {
+  const appDir = path.join(process.cwd(), "src/app");
+  const routes: string[] = [];
+
+  function walk(dir: string) {
+    for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+      const fullPath = path.join(dir, entry.name);
+      if (entry.isDirectory()) {
+        if (!entry.name.includes("[")) {
+          walk(fullPath);
+        }
+      } else if (entry.name === "page.tsx" || entry.name === "page.ts") {
+        const rel = path.relative(appDir, dir);
+        routes.push(rel === "" ? "/" : `/${rel}/`);
+      }
+    }
+  }
+
+  walk(appDir);
+  return routes;
+}
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const base = docsConfig.siteUrl;
+
+  const staticEntries: MetadataRoute.Sitemap = getStaticAppRoutes().map(
+    (route) => ({ url: `${base}${route}` })
+  );
+
+  const docsEntries: MetadataRoute.Sitemap = Object.values(docsCollection)
+    .filter((doc) => {
+      if (doc.type === "local-doc") {
+        return true;
+      }
+      if (doc.version === doc.latestVersion) {
+        return true;
+      }
+      return docsConfig.ltsVersions[doc.repo]?.includes(doc.version) ?? false;
+    })
+    .map((doc) => ({ url: `${base}/docs/${doc.slug}/` }));
+
+  const blogEntries: MetadataRoute.Sitemap = getAllPostFileNames().map(
+    (fileName) => ({
+      url: `${base}${postFileNameToPath(fileName)}`,
+    })
+  );
+
+  return [...staticEntries, ...docsEntries, ...blogEntries];
+}