Scaffold Docker-only Node 24 + TypeScript EJS web backend

src/app.ts

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+import { createServer, type Server } from "node:http";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import * as ejs from "ejs";
+import { serveStatic } from "./static.ts";
+
+const rootDir = join(dirname(fileURLToPath(import.meta.url)), "..");
+
+export interface AppOptions {
+  publicDir?: string;
+  viewsDir?: string;
+}
+
+export function createApp(options: AppOptions = {}): Server {
+  const publicDir = options.publicDir ?? join(rootDir, "public");
+  const viewsDir = options.viewsDir ?? join(rootDir, "views");
+
+  const render = (view: string, data: Record<string, unknown>): Promise<string> =>
+    ejs.renderFile(join(viewsDir, `${view}.ejs`), data);
+
+  return createServer(async (req, res) => {
+    try {
+      if (req.method !== "GET" && req.method !== "HEAD") {
+        res.writeHead(405, { "content-type": "text/plain; charset=utf-8" }).end("Method Not Allowed");
+        return;
+      }
+
+      const { pathname } = new URL(req.url ?? "/", "http://localhost");
+
+      if (pathname.startsWith("/public/")) {
+        await serveStatic(publicDir, pathname.slice("/public/".length), res);
+        return;
+      }
+
+      if (pathname === "/") {
+        res.writeHead(200, { "content-type": "text/html; charset=utf-8" });
+        res.end(await render("index", { title: "Plainpages" }));
+        return;
+      }
+
+      res.writeHead(404, { "content-type": "text/html; charset=utf-8" });
+      res.end(await render("404", { title: "Not found" }));
+    } catch (err) {
+      console.error(err);
+      if (!res.headersSent) res.writeHead(500, { "content-type": "text/plain; charset=utf-8" });
+      res.end("Internal Server Error");
+    }
+  });
+}