fix build env

packages/auth/src/server.ts

@@ -4,26 +4,29 @@ import { drizzleAdapter } from 'better-auth/adapters/drizzle'
 import { magicLink } from 'better-auth/plugins'
 import { Resend } from 'resend'
 
-if (!process.env.BETTER_AUTH_SECRET) {
+let _auth: ReturnType<typeof betterAuth> | null = null
+
+function getAuth() {
+  if (!_auth) {
+    const betterAuthSecret = process.env.BETTER_AUTH_SECRET
+    const betterAuthUrl = process.env.BETTER_AUTH_URL
+
+    if (!betterAuthSecret) {
       throw new Error(
-    'Missing BETTER_AUTH_SECRET environment variable. Generate one with: openssl rand -base64 32',
+        'Missing BETTER_AUTH_SECRET environment variable. Please configure it in your deployment settings or .env.local file. Generate one with: openssl rand -base64 32',
       )
     }
 
-if (!process.env.BETTER_AUTH_URL) {
+    if (!betterAuthUrl) {
       throw new Error(
-    'Missing BETTER_AUTH_URL environment variable. Set it to your app URL (e.g., http://localhost:3000)',
+        'Missing BETTER_AUTH_URL environment variable. Please configure it in your deployment settings or .env.local file. Set it to your app URL (e.g., http://localhost:3000 or https://yourdomain.com)',
       )
     }
 
     // Initialize Resend for email sending
     const resend = process.env.RESEND_API_KEY ? new Resend(process.env.RESEND_API_KEY) : null
 
-/**
- * Better Auth server instance
- * Configured with PostgreSQL database (Supabase) and magic link authentication
- */
-export const auth = betterAuth({
+    _auth = betterAuth({
       database: drizzleAdapter(db, {
         provider: 'pg',
         usePlural: true,
@@ -34,8 +37,8 @@ export const auth = betterAuth({
           generateId: false, // Use our prefixed nanoid IDs from schema
         },
       },
-  secret: process.env.BETTER_AUTH_SECRET,
-  baseURL: process.env.BETTER_AUTH_URL,
+      secret: betterAuthSecret,
+      baseURL: betterAuthUrl,
       plugins: [
         magicLink({
           sendMagicLink: async ({ email, url }) => {
@@ -83,6 +86,21 @@ export const auth = betterAuth({
         },
       },
     })
+  }
+  return _auth
+}
+
+/**
+ * Better Auth server instance
+ * Configured with PostgreSQL database (Supabase) and magic link authentication
+ *
+ * Initialized lazily to avoid requiring env vars at build time
+ */
+export const auth = new Proxy({} as ReturnType<typeof betterAuth>, {
+  get(_target, prop) {
+    return Reflect.get(getAuth(), prop)
+  },
+})
 
 /**
  * Type helpers for better-auth session