Single part at the root, COMPOSE_FILE in .env

template/{{ part_dir }}/{% if serve == 'static' %}serve.ts{% endif %}.jinja

@@ -0,0 +1,36 @@
+const ROOT = `${import.meta.dir}/build`;
+const PORT = Number(Bun.env.PORT ?? 3000);
+const IMMUTABLE = "/_app/immutable/";
+
+const fallback = Bun.file(`${ROOT}/index.html`);
+
+function headersFor(pathname: string): HeadersInit {
+  if (pathname.startsWith(IMMUTABLE)) {
+    return { "Cache-Control": "public, max-age=31536000, immutable" };
+  }
+  return { "Cache-Control": "no-cache" };
+}
+
+Bun.serve({
+  async fetch(request) {
+    const { pathname } = new URL(request.url);
+
+    if (pathname.includes("..")) {
+      return new Response("Bad Request", { status: 400 });
+    }
+
+    const file = Bun.file(`${ROOT}${pathname}`);
+    if (await file.exists()) {
+      return new Response(file, { headers: headersFor(pathname) });
+    }
+
+    return new Response(fallback, {
+      headers: {
+        "Cache-Control": "no-cache",
+        "Content-Type": "text/html; charset=utf-8",
+      },
+    });
+  },
+  idleTimeout: 30,
+  port: PORT,
+});