From eedd14f3cdb01a871c86b15d33fb27dc4244f83d Mon Sep 17 00:00:00 2001
From: psiservices-justin-sullard
 <70025273+psiservices-justin-sullard@users.noreply.github.com>
Date: Wed, 12 Jan 2022 15:47:50 -0600
Subject: [PATCH] Ensure posix compliant joins for urls in middleware (#11640)

---
 packages/react-dev-utils/noopServiceWorkerMiddleware.js  | 2 +-
 packages/react-dev-utils/redirectServedPathMiddleware.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/react-dev-utils/noopServiceWorkerMiddleware.js b/packages/react-dev-utils/noopServiceWorkerMiddleware.js
index 4e660b57643..0ca939ac562 100644
--- a/packages/react-dev-utils/noopServiceWorkerMiddleware.js
+++ b/packages/react-dev-utils/noopServiceWorkerMiddleware.js
@@ -11,7 +11,7 @@ const path = require('path');
 
 module.exports = function createNoopServiceWorkerMiddleware(servedPath) {
   return function noopServiceWorkerMiddleware(req, res, next) {
-    if (req.url === path.join(servedPath, 'service-worker.js')) {
+    if (req.url === path.posix.join(servedPath, 'service-worker.js')) {
       res.setHeader('Content-Type', 'text/javascript');
       res.send(
         `// This service worker file is effectively a 'no-op' that will reset any
diff --git a/packages/react-dev-utils/redirectServedPathMiddleware.js b/packages/react-dev-utils/redirectServedPathMiddleware.js
index a71578f0a9f..2fda106b04d 100644
--- a/packages/react-dev-utils/redirectServedPathMiddleware.js
+++ b/packages/react-dev-utils/redirectServedPathMiddleware.js
@@ -19,7 +19,7 @@ module.exports = function createRedirectServedPathMiddleware(servedPath) {
     ) {
       next();
     } else {
-      const newPath = path.join(servedPath, req.path !== '/' ? req.path : '');
+      const newPath = path.posix.join(servedPath, req.path !== '/' ? req.path : '');
       res.redirect(newPath);
     }
   };