From 7af44b573775696c6e22a990c3f19095f74b93d8 Mon Sep 17 00:00:00 2001
From: lprnmns <manasalperen@gmail.com>
Date: Sun, 30 Aug 2026 04:42:31 +0300
Subject: [PATCH] fix: allow autoConfig callbacks without global options

Signed-off-by: lprnmns <manasalperen@gmail.com>
---
 index.js                                     |  2 +-
 test/commonjs/auto-config-no-global.js       | 23 ++++++++++++++++++++
 test/commonjs/auto-config-no-global/route.js |  7 ++++++
 3 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 test/commonjs/auto-config-no-global.js
 create mode 100644 test/commonjs/auto-config-no-global/route.js

diff --git a/index.js b/index.js
index 1d130676..6e884f03 100644
--- a/index.js
+++ b/index.js
@@ -247,7 +247,7 @@ function registerPlugin (fastify, meta, allPlugins, parentPlugins = {}) {
   meta.registered = true
 }
 
-function loadPluginOptions (content, overrideConfig) {
+function loadPluginOptions (content, overrideConfig = {}) {
   const pluginConfig = (content.default?.autoConfig) || content.autoConfig || {}
   if (typeof pluginConfig === 'function') {
     const pluginOptions = (fastify) => ({ ...pluginConfig(fastify), ...overrideConfig })
diff --git a/test/commonjs/auto-config-no-global.js b/test/commonjs/auto-config-no-global.js
new file mode 100644
index 00000000..421ad312
--- /dev/null
+++ b/test/commonjs/auto-config-no-global.js
@@ -0,0 +1,23 @@
+'use strict'
+
+const { describe, it } = require('node:test')
+const assert = require('node:assert')
+const path = require('node:path')
+const Fastify = require('fastify')
+const autoLoad = require('../../')
+
+describe('callback autoConfig without global options', function () {
+  it('loads a plugin when the global options object is omitted', async function (t) {
+    const app = Fastify()
+    t.after(() => app.close())
+
+    app.register(autoLoad, {
+      dir: path.join(__dirname, 'auto-config-no-global')
+    })
+    await app.ready()
+
+    const res = await app.inject({ url: '/' })
+    assert.strictEqual(res.statusCode, 200)
+    assert.deepStrictEqual(res.json(), { loaded: true })
+  })
+})
diff --git a/test/commonjs/auto-config-no-global/route.js b/test/commonjs/auto-config-no-global/route.js
new file mode 100644
index 00000000..a1dec345
--- /dev/null
+++ b/test/commonjs/auto-config-no-global/route.js
@@ -0,0 +1,7 @@
+'use strict'
+
+module.exports = async function (app) {
+  app.get('/', async () => ({ loaded: true }))
+}
+
+module.exports.autoConfig = () => ({})