feat: express app setup

src/env.ts

@@ -0,0 +1,17 @@
+import "dotenv/config";
+import { z } from "zod";
+
+const schema = z.object({
+  PORT: z.coerce.number(),
+});
+const result = schema.safeParse(process.env);
+if (!result.success) {
+  console.error("ERROR: Environment variable validation failed:");
+  for (const issue of result.error.issues) {
+    console.error(`- ${issue.path.join(".")}: ${issue.message}`);
+  }
+
+  process.exit(1);
+}
+
+export const env = result.data;

src/index.ts

@@ -0,0 +1,10 @@
+import express from "express";
+import { env } from "./env";
+
+const app = express();
+
+app.use(express.json());
+
+app.listen(env.PORT, () => {
+  console.log(`Server running on port ${env.PORT}`);
+});