fix: use srcDir/serverDir instead of hardcoded paths

Author: onmax

docs/content/1.getting-started/3.configuration.md

@@ -36,7 +36,7 @@ export default defineNuxtConfig({
 
 ## Server Configuration
 
-The core of your authentication logic resides in `server/auth.config.ts`. This file allows you to configure Better Auth plugins, providers, and settings.
+The core of your authentication logic resides in `<serverDir>/auth.config.ts`. By default, this is `server/auth.config.ts`. This file allows you to configure Better Auth plugins, providers, and settings.
 
 ### defineServerAuth
 

docs/content/1.getting-started/4.client-setup.md

@@ -5,7 +5,10 @@ description: Configure the client-side authentication client.
 
 ## Create the Client Factory
 
-Create a file at `app/auth.client.ts` (or `.js`) and export a `createAppAuthClient` function.
+Create a file at `<srcDir>/auth.client.ts` (or `.js`) and export a `createAppAuthClient` function.
+
+- **Nuxt 4** (default): `app/auth.client.ts`
+- **Nuxt 3**: `auth.client.ts` (at project root)
 
 ```ts [app/auth.client.ts]
 import { createAuthClient } from 'better-auth/vue'
@@ -28,7 +31,7 @@ This file is required because Better Auth plugins often have a client-side count
 
 ## Using Plugins
 
-If you added a plugin in `server/auth.config.ts`, make sure to add its client equivalent here.
+If you added a plugin in your server config (`auth.config.ts`), make sure to add its client equivalent here.
 
 ```ts [app/auth.client.ts]
 import { createAuthClient } from 'better-auth/vue'

src/module.ts

@@ -21,16 +21,16 @@ export default defineNuxtModule<BetterAuthModuleOptions>({
   async setup(options, nuxt) {
     const resolver = createResolver(import.meta.url)
 
-    const serverConfigPath = resolver.resolve(nuxt.options.rootDir, 'server/auth.config')
-    const clientConfigPath = resolver.resolve(nuxt.options.rootDir, 'app/auth.client')
+    const serverConfigPath = resolver.resolve(nuxt.options.serverDir, 'auth.config')
+    const clientConfigPath = resolver.resolve(nuxt.options.srcDir, 'auth.client')
 
     const serverConfigExists = existsSync(`${serverConfigPath}.ts`) || existsSync(`${serverConfigPath}.js`)
     const clientConfigExists = existsSync(`${clientConfigPath}.ts`) || existsSync(`${clientConfigPath}.js`)
 
     if (!serverConfigExists)
-      throw new Error('[@onmax/nuxt-better-auth] Missing server/auth.config.ts - create with defineServerAuth()')
+      throw new Error(`[@onmax/nuxt-better-auth] Missing ${serverConfigPath}.ts - create with defineServerAuth()`)
     if (!clientConfigExists)
-      throw new Error('[@onmax/nuxt-better-auth] Missing app/auth.client.ts - export createAppAuthClient()')
+      throw new Error(`[@onmax/nuxt-better-auth] Missing ${clientConfigPath}.ts - export createAppAuthClient()`)
 
     const hub = (nuxt.options as unknown as Record<string, unknown>).hub as { db?: boolean | string | object, kv?: boolean } | undefined
     const hasDb = !!hub?.db