Add Express service with health endpoint

.gitignore

@@ -0,0 +1,2 @@
+node_modules
+dist

package.json

@@ -2,8 +2,19 @@
   "name": "demo-repo",
   "version": "0.2.0",
   "description": "A sample package.json",
+  "scripts": {
+    "dev": "ts-node src/index.ts",
+    "build": "tsc",
+    "start": "node dist/index.js"
+  },
   "dependencies": {
-    "@primer/css": "17.0.1"
+    "@primer/css": "17.0.1",
+    "express": "^4.19.2"
+  },
+  "devDependencies": {
+    "@types/express": "^4.17.21",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.6.2"
   },
   "license": "MIT"
 }

src/index.ts

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+import express from "express";
+import path from "path";
+import health from "./routes/health";
+
+const app = express();
+
+app.use(health);
+
+app.get("/", (_req, res) => {
+  res.sendFile(path.join(__dirname, "../index.html"));
+});
+
+const port = Number(process.env.PORT) || 8080;
+
+app.listen(port, "0.0.0.0", () => {
+  console.log(`[blackroad-os-demo] listening on http://0.0.0.0:${port}`);
+});

src/routes/health.ts

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+import { Router } from "express";
+
+const r = Router();
+
+r.get("/health", (_req, res) => {
+  res.status(200).json({ status: "ok", service: "blackroad-os-demo" });
+});
+
+export default r;

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2019",
+    "module": "CommonJS",
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "skipLibCheck": true
+  },
+  "include": ["src/**/*"]
+}