Update Dockerfile and package.json to include environment variables, expose port, and add server entry point; add server implementation in src/server.ts with health check and greeting endpoint.

Dockerfile

@@ -6,9 +6,12 @@ COPY package.json package-lock.json* tsconfig.json ./
 RUN npm install --no-audit --progress=false
 
 COPY src ./src
+COPY .env* ./
 
 RUN npm run build && npm pack
 
-CMD ["node", "dist/index.js"]
+ENV PORT=3000
+EXPOSE 3000
+CMD ["node", "dist/server.js"]
 
 

package.json

@@ -8,7 +8,9 @@
   "scripts": {
     "clean": "rimraf dist",
     "build": "npm run clean && tsc -p tsconfig.json",
-    "test": "vitest run"
+    "test": "vitest run",
+    "start": "node dist/server.js",
+    "dev": "tsx watch src/server.ts"
   },
   "files": [
     "dist",
@@ -17,6 +19,22 @@
   "engines": {
     "node": ">=20"
   },
-  "license": "MIT"
+  "license": "MIT",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.19.2",
+    "helmet": "^7.1.0",
+    "morgan": "^1.10.0"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.17",
+    "@types/express": "^4.17.21",
+    "@types/morgan": "^1.9.7",
+    "@types/node": "^20.14.12",
+    "rimraf": "^5.0.7",
+    "tsx": "^4.19.1",
+    "typescript": "^5.5.4",
+    "vitest": "^1.6.0"
+  }
 }
 

src/server.ts

@@ -0,0 +1,53 @@
+import express, { Request, Response, NextFunction } from "express";
+import cors from "cors";
+import morgan from "morgan";
+import helmet from "helmet";
+import { Greeter } from "./core/Greeter";
+
+const app = express();
+
+// Middlewares
+app.use(helmet());
+app.use(cors());
+app.use(express.json());
+app.use(morgan("dev"));
+
+// Health check
+app.get("/health", (_req: Request, res: Response) => {
+  res.status(200).json({ status: "ok" });
+});
+
+// Greeting endpoint
+app.get("/greet", (req: Request, res: Response) => {
+  const name = (req.query.name as string) ?? "";
+  const prefix = (req.query.prefix as string) ?? undefined;
+  const greeter = new Greeter(prefix);
+  const message = greeter.greet(name);
+  res.json({ message });
+});
+
+// 404 handler
+app.use((_req: Request, res: Response) => {
+  res.status(404).json({ error: "Not Found" });
+});
+
+// Error handler
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+app.use((err: unknown, _req: Request, res: Response, _next: NextFunction) => {
+  // eslint-disable-next-line no-console
+  console.error(err);
+  res.status(500).json({ error: "Internal Server Error" });
+});
+
+const port = Number(process.env.PORT ?? 3000);
+
+if (require.main === module) {
+  app.listen(port, () => {
+    // eslint-disable-next-line no-console
+    console.log(`Server listening on http://localhost:${port}`);
+  });
+}
+
+export default app;
+
+