Remove case-sensitive-paths-plugin (#6587)

While this is a nice feature it does filesystem operations to check if the resolved file matches the filesystem.

packages/next/build/webpack-config.ts

 import path from 'path'
 import webpack from 'webpack'
 import resolve from 'resolve'
-import CaseSensitivePathPlugin from 'case-sensitive-paths-webpack-plugin'
 import NextJsSsrImportPlugin from './webpack/plugins/nextjs-ssr-import'
 import NextJsSSRModuleCachePlugin from './webpack/plugins/nextjs-ssr-module-cache'
 import NextJsRequireCacheHotReloader from './webpack/plugins/nextjs-require-cache-hot-reloader'
@@ -252,7 +251,6 @@ export default function getBaseWebpackConfig (dir: string, {dev = false, isServe
       dev && !isServer && new webpack.HotModuleReplacementPlugin(),
       dev && new webpack.NoEmitOnErrorsPlugin(),
       dev && new UnlinkFilePlugin(),
-      dev && new CaseSensitivePathPlugin(), // Since on macOS the filesystem is case-insensitive this will make sure your path are case-sensitive
       !dev && new webpack.HashedModuleIdsPlugin(),
       // Removes server/client code by minifier
       new webpack.DefinePlugin({

packages/next/package.json

@@ -58,7 +58,6 @@
     "babel-plugin-react-require": "3.0.0",
     "babel-plugin-transform-react-remove-prop-types": "0.4.15",
     "cacache": "^11.0.2",
-    "case-sensitive-paths-webpack-plugin": "2.1.2",
     "chalk": "2.4.2",
     "find-cache-dir": "2.0.0",
     "find-up": "2.1.0",
@@ -103,7 +102,6 @@
     "@types/babel__generator": "7.0.1",
     "@types/babel__template": "7.0.1",
     "@types/babel__traverse": "7.0.3",
-    "@types/case-sensitive-paths-webpack-plugin": "2.1.2",
     "@types/cross-spawn": "6.0.0",
     "@types/etag": "1.8.0",
     "@types/fresh": "0.5.0",

yarn.lock

@@ -1558,13 +1558,6 @@
   dependencies:
     "@babel/types" "^7.0.0"
 
-"@types/case-sensitive-paths-webpack-plugin@2.1.2":
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/@types/case-sensitive-paths-webpack-plugin/-/case-sensitive-paths-webpack-plugin-2.1.2.tgz#8fbac6359d31f75861f3c2f93a60768c8293c563"
-  integrity sha512-ah/PG3Iz3CLuHk8bczITiGvDcNLogZQfJDL+e7pcJXKdD/5Qp1FB6lxSjPsfXw8fHbhEfaJIq9om3hK6ir391g==
-  dependencies:
-    "@types/webpack" "*"
-
 "@types/cross-spawn@6.0.0":
   version "6.0.0"
   resolved "https://registry.yarnpkg.com/@types/cross-spawn/-/cross-spawn-6.0.0.tgz#320aaf1d1a12979f1b84fe7a5590a7e860bf3a80"
@@ -3098,11 +3091,6 @@ capture-exit@^1.2.0:
   dependencies:
     rsvp "^3.3.3"
 
-case-sensitive-paths-webpack-plugin@2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/case-sensitive-paths-webpack-plugin/-/case-sensitive-paths-webpack-plugin-2.1.2.tgz#c899b52175763689224571dad778742e133f0192"
-  integrity sha512-oEZgAFfEvKtjSRCu6VgYkuGxwrWXMnQzyBmlLPP7r6PWQVtHxP5Z5N6XsuJvtoVax78am/r7lr46bwo3IVEBOg==
-
 caseless@~0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"