feat: integrate @t3-oss/env for environment variable management across the application

packages/db/src/index.ts

@@ -1,17 +1,15 @@
 import { drizzle } from "drizzle-orm/postgres-js";
 import postgres from "postgres";
 import * as schema from "./schema";
+import { keys } from "./keys";
 
+const { DATABASE_URL } = keys();
 // Create a lazy database instance that only initializes when accessed
 let _db: ReturnType<typeof drizzle> | null = null;
 
 function getDb() {
-  if (!process.env.DATABASE_URL) {
-    throw new Error("DATABASE_URL is not set");
-  }
-
   if (!_db) {
-    const client = postgres(process.env.DATABASE_URL);
+    const client = postgres(DATABASE_URL);
     _db = drizzle(client, { schema });
   }
 

packages/db/src/keys.ts

@@ -0,0 +1,19 @@
+import { createEnv } from "@t3-oss/env-nextjs";
+import { z } from "zod";
+
+export const keys = () =>
+  createEnv({
+    server: {
+      NODE_ENV: z
+        .enum(["development", "production", "test"])
+        .default("development"),
+      DATABASE_URL: z
+        .string()
+        .startsWith("postgres://")
+        .or(z.string().startsWith("postgresql://")),
+    },
+    runtimeEnv: {
+      NODE_ENV: process.env.NODE_ENV,
+      DATABASE_URL: process.env.DATABASE_URL,
+    },
+  });