From e92cd9a9c14b254401a0dcaa6033e7aecee3363d Mon Sep 17 00:00:00 2001
From: JJ Kasper <jj@jjsweb.site>
Date: Fri, 1 Nov 2019 16:28:53 -0500
Subject: [PATCH] Handle backslashes for plugins

---
 packages/next/build/plugins/collect-plugins.ts | 2 +-
 packages/next/build/webpack-config.ts          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/next/build/plugins/collect-plugins.ts b/packages/next/build/plugins/collect-plugins.ts
index a0d3af2f6313f..df5985a4a9ef7 100644
--- a/packages/next/build/plugins/collect-plugins.ts
+++ b/packages/next/build/plugins/collect-plugins.ts
@@ -126,7 +126,7 @@ async function collectPluginMeta(
 
   return {
     middleware,
-    directory: pkgDir,
+    directory: pkgDir.replace(/\\/g, '/'),
     requiredEnv: pluginMetaData['required-env'],
     version: pluginPackageJson.version,
     pluginName: pluginMetaData.name,
diff --git a/packages/next/build/webpack-config.ts b/packages/next/build/webpack-config.ts
index 982c3401127c6..4451df4d8e1a3 100644
--- a/packages/next/build/webpack-config.ts
+++ b/packages/next/build/webpack-config.ts
@@ -118,7 +118,7 @@ export default async function getBaseWebpackConfig(
     /next[\\/]dist[\\/]pages/,
     /[\\/](strip-ansi|ansi-regex)[\\/]/,
     ...(config.experimental.plugins
-      ? VALID_MIDDLEWARE.map(name => new RegExp(`src/${name}`))
+      ? VALID_MIDDLEWARE.map(name => new RegExp(`src(\\\\|/)${name}`))
       : []),
   ]