feat: add env validation

env.mjs

@@ -0,0 +1,15 @@
+import { createEnv } from "@t3-oss/env-nextjs"
+import { z } from "zod"
+
+export const env = createEnv({
+  server: {
+    ANALYZE: z
+      .enum(["true", "false"])
+      .optional()
+      .transform((value) => value === "true"),
+  },
+  client: {},
+  runtimeEnv: {
+    ANALYZE: process.env.ANALYZE,
+  },
+})

next.config.mjs

@@ -1,10 +1,11 @@
 import withBundleAnalyzer from "@next/bundle-analyzer"
 import withPlugins from "next-compose-plugins"
+import { env } from "./env.mjs"
 
 /**
  * @type {import('next').NextConfig}
  */
-const config = withPlugins([[withBundleAnalyzer({ enabled: process.env.ANALYZE === "true" })]], {
+const config = withPlugins([[withBundleAnalyzer({ enabled: env.ANALYZE })]], {
   reactStrictMode: true,
   experimental: { instrumentationHook: true },
   rewrites() {