From 70cd01015df406e7cd02c3bfa04f76dbe312a878 Mon Sep 17 00:00:00 2001
From: Reuben <4957964+reubn@users.noreply.github.com>
Date: Wed, 23 Feb 2022 12:28:17 +0000
Subject: [PATCH] Fix CSS Loader Detection False Positives (#34584)

`test.css`, `test.scss` etc. will falsely match on a loader that searches for the string `test`


fixes #34583



## Bug

- [x] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [x] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`
---
 packages/next/build/webpack-config.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/next/build/webpack-config.ts b/packages/next/build/webpack-config.ts
index f030cf3139e4337..abd2b01a08296b7 100644
--- a/packages/next/build/webpack-config.ts
+++ b/packages/next/build/webpack-config.ts
@@ -1848,11 +1848,11 @@ export default async function getBaseWebpackConfig(
     }
 
     const fileNames = [
-      '/tmp/test.css',
-      '/tmp/test.scss',
-      '/tmp/test.sass',
-      '/tmp/test.less',
-      '/tmp/test.styl',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.css',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.scss',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.sass',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.less',
+      '/tmp/NEXTJS_CSS_DETECTION_FILE.styl',
     ]
 
     if (rule instanceof RegExp && fileNames.some((input) => rule.test(input))) {