From 762e3f0f9a01e4434320fa880299d21f7c66c307 Mon Sep 17 00:00:00 2001
From: onmax <maximogarciamtnez@gmail.com>
Date: Tue, 23 Jun 2026 15:10:39 +0200
Subject: [PATCH] fix: pass runtime config to schema auth factory

---
 src/module/schema.ts                                |  2 +-
 src/schema-generator.ts                             |  3 ++-
 test/cases/auth-schema-export/nuxt.config.ts        |  5 ++++-
 test/cases/auth-schema-export/server/auth.config.ts |  6 +++---
 test/schema-generator.test.ts                       | 11 +++++++++++
 5 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/src/module/schema.ts b/src/module/schema.ts
index a16ccb33..08c71a3c 100644
--- a/src/module/schema.ts
+++ b/src/module/schema.ts
@@ -73,7 +73,7 @@ async function loadAuthOptions(context: SchemaContext) {
       .filter(([, value]) => typeof value === 'string')
       .map(([key, value]) => [key, value as string]),
   )
-  const userConfig = await loadUserAuthConfig(configFile, isProduction, alias)
+  const userConfig = await loadUserAuthConfig(configFile, isProduction, alias, context.nuxt.options.runtimeConfig)
 
   const extendedConfig: { plugins?: BetterAuthPlugin[] } = {}
   await context.nuxt.callHook('better-auth:config:extend', extendedConfig)
diff --git a/src/schema-generator.ts b/src/schema-generator.ts
index d7517e1b..45b1c78e 100644
--- a/src/schema-generator.ts
+++ b/src/schema-generator.ts
@@ -68,6 +68,7 @@ export async function loadUserAuthConfig(
   configPath: string,
   throwOnError = false,
   alias?: Record<string, string>,
+  runtimeConfig: unknown = {},
 ): Promise<Partial<BetterAuthOptions>> {
   const { createJiti } = await import('jiti')
   const { defineServerAuth: runtimeDefineServerAuth } = await import('./runtime/config')
@@ -87,7 +88,7 @@ export async function loadUserAuthConfig(
     const mod = await jiti.import(configPath) as { default?: unknown }
     const configFn = mod.default
     if (typeof configFn === 'function') {
-      return configFn({ runtimeConfig: {}, db: null })
+      return configFn({ runtimeConfig, db: null })
     }
     consola.warn('[@onmax/nuxt-better-auth] auth.config.ts does not export default. Expected: export default defineServerAuth(...)')
     if (throwOnError) {
diff --git a/test/cases/auth-schema-export/nuxt.config.ts b/test/cases/auth-schema-export/nuxt.config.ts
index a60a66d0..1dc86ae4 100644
--- a/test/cases/auth-schema-export/nuxt.config.ts
+++ b/test/cases/auth-schema-export/nuxt.config.ts
@@ -5,6 +5,9 @@ export default defineNuxtConfig({
 
   runtimeConfig: {
     betterAuthSecret: 'test-secret-for-testing-only-32chars!',
-    public: { siteUrl: 'http://localhost:3000' },
+    public: {
+      app: { routes: { signUp: '/auth/sign-up' } },
+      siteUrl: 'http://localhost:3000',
+    },
   },
 })
diff --git a/test/cases/auth-schema-export/server/auth.config.ts b/test/cases/auth-schema-export/server/auth.config.ts
index b2590c36..9707e0cf 100644
--- a/test/cases/auth-schema-export/server/auth.config.ts
+++ b/test/cases/auth-schema-export/server/auth.config.ts
@@ -1,6 +1,6 @@
 import { defineServerAuth } from '../../../../src/runtime/config'
 
-export default defineServerAuth({
-  appName: 'Auth Schema Export Test',
+export default defineServerAuth(({ runtimeConfig }) => ({
+  appName: runtimeConfig.public.app.routes.signUp,
   emailAndPassword: { enabled: true },
-})
+}))
diff --git a/test/schema-generator.test.ts b/test/schema-generator.test.ts
index 1ae3a930..89ef4e53 100644
--- a/test/schema-generator.test.ts
+++ b/test/schema-generator.test.ts
@@ -149,6 +149,17 @@ describe('loadUserAuthConfig', () => {
 
     expect(result).toEqual({ plugins: [] })
   })
+
+  it('passes runtime config to function syntax during schema generation', async () => {
+    const configPath = join(TEST_DIR, 'runtime-config.ts')
+    writeFileSync(configPath, `export default defineServerAuth(({ runtimeConfig }) => ({ appName: runtimeConfig.public.app.routes.signUp }))`)
+
+    const result = await loadUserAuthConfig(configPath, false, undefined, {
+      public: { app: { routes: { signUp: '/auth/sign-up' } } },
+    })
+
+    expect(result).toEqual({ appName: '/auth/sign-up' })
+  })
 })
 
 describe('defineServerAuth', () => {