From d4bef88b2b8132b5b892ddf31b5944871dd5f31e Mon Sep 17 00:00:00 2001
From: Sophia Willows <20146550+sophiabits@users.noreply.github.com>
Date: Fri, 18 Feb 2022 11:22:52 +1300
Subject: [PATCH] Only log experiments warning if user actually opted in to an
 experiment(s) (#34413)

Currently if you have a Next config like the following:

```js
module.exports = {
  experimental: {},
},
```

You are presented with the warning for experimental features, even though you haven't actually enabled any experiments. This PR checks there's at least one key in the `experimental` object before logging the warning.
---
 packages/next/server/config.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/next/server/config.ts b/packages/next/server/config.ts
index 1250ea0dfe38004..2e334084a915830 100644
--- a/packages/next/server/config.ts
+++ b/packages/next/server/config.ts
@@ -67,8 +67,9 @@ function assignDefaults(userConfig: { [key: string]: any }) {
 
       if (
         key === 'experimental' &&
-        value !== undefined &&
-        value !== defaultConfig[key]
+        value !== defaultConfig[key] &&
+        typeof value === 'object' &&
+        Object.keys(value).length > 0
       ) {
         experimentalWarning()
       }