feat:(env type safe) - add zod validation & declare type

.gitignore

@@ -1,3 +1,4 @@
 dist
 node_modules
 .vscode
+.env

package.json

@@ -22,6 +22,7 @@
     "prettier": "^3.2.4",
     "rimraf": "^5.0.5",
     "tsconfig-paths": "^4.2.0",
-    "typescript": "^5.3.3"
+    "typescript": "^5.3.3",
+    "zod": "^3.22.4"
   }
 }

src/index.ts

@@ -4,6 +4,8 @@ const FASTIFY_PORT = Number(process.env.FASTIFY_PORT) || 3006;
 
 app.listen({ port: FASTIFY_PORT });
 
-console.log(`🚀  Fastify server running on port http://localhost:${FASTIFY_PORT}`);
+console.log(
+  `🚀  Fastify server running on port http://localhost:${FASTIFY_PORT}`
+);
 console.log(`Route index: /`);
 console.log(`Route user: /api/v1/user`);

tsconfig.json

@@ -18,6 +18,7 @@
     "node_modules"
   ],
   "include": [
-    "./src/**/*.ts"
+    "./src/**/*.ts",
+    "type.env.ts"
   ]
 }

type.env.ts

@@ -0,0 +1,22 @@
+/**
+ *
+ * Simple configuration that enables type-safe reading of environment variables
+ * & provides auto-completion support in VSCode.
+ * Matt Pocock did a video explaining how you can implement this approach:
+ * see https://www.youtube.com/watch?v=q1im-hMlKhM
+ */
+
+import z from "zod";
+
+const envVariables = z.object({
+  FASTIFY_PORT: z.string(),
+  DATABASE_URL: z.string(),
+});
+
+envVariables.parse(process.env);
+
+declare global {
+  namespace NodeJS {
+    interface ProcessEnv extends z.infer<typeof envVariables> {}
+  }
+}