From b3cab28cf6d1d4b52afd3d338a58365d12e83efb Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Thu, 16 Jan 2020 23:57:45 -0700
Subject: [PATCH 01/34] Add built-in Sass support

---
 .../build/webpack/config/blocks/css/index.ts  | 173 ++++++++++++++----
 packages/next/package.json                    |   1 +
 2 files changed, 136 insertions(+), 38 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index ef8fb5a60185a..8f050419cc704 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -132,13 +132,58 @@ export const css = curry(async function css(
     true
   )
 
+  function getModuleStyleLoader(
+    cssOptions: webpack.ParserOptions,
+    preProcessor: string
+  ) {
+    const loaders: webpack.RuleSetUseItem[] = [
+      // Resolve CSS `@import`s and `url()`s
+      {
+        loader: require.resolve('css-loader'),
+        options: cssOptions,
+      },
+
+      // Compile CSS
+      {
+        loader: require.resolve('postcss-loader'),
+        options: {
+          ident: '__nextjs_postcss',
+          plugins: postCssPlugins,
+          sourceMap: true,
+        },
+      },
+    ].filter(Boolean)
+
+    // Add appropriate development mode or production mode style loader first
+    if (ctx.isClient) {
+      loaders.unshift(
+        getClientStyleLoader({
+          isDevelopment: ctx.isDevelopment,
+          assetPrefix: ctx.assetPrefix,
+        })
+      )
+    }
+
+    // Add preprocessor loader
+    if (preProcessor) {
+      loaders.push({
+        loader: require.resolve(preProcessor),
+        options: {
+          sourceMap: true,
+        },
+      })
+    }
+
+    return loaders
+  }
+
   // CSS cannot be imported in _document. This comes before everything because
   // global CSS nor CSS modules work in said file.
   fns.push(
     loader({
       oneOf: [
         {
-          test: /\.css$/,
+          test: /\.(css|scss|sass)$/,
           // Use a loose regex so we don't have to crawl the file system to
           // find the real file name (if present).
           issuer: { test: /pages[\\/]_document\./ },
@@ -173,46 +218,62 @@ export const css = curry(async function css(
             exclude: /node_modules/,
           },
 
-          use: ([
-            // Add appropriate development more or production mode style
-            // loader
-            ctx.isClient &&
-              getClientStyleLoader({
-                isDevelopment: ctx.isDevelopment,
-                assetPrefix: ctx.assetPrefix,
-              }),
-
-            // Resolve CSS `@import`s and `url()`s
+          use: getModuleStyleLoader(
             {
-              loader: require.resolve('css-loader'),
-              options: {
-                importLoaders: 1,
-                sourceMap: true,
-                onlyLocals: ctx.isServer,
-                modules: {
-                  // Disallow global style exports so we can code-split CSS and
-                  // not worry about loading order.
-                  mode: 'pure',
-                  // Generate a friendly production-ready name so it's
-                  // reasonably understandable. The same name is used for
-                  // development.
-                  // TODO: Consider making production reduce this to a single
-                  // character?
-                  getLocalIdent: getCssModuleLocalIdent,
-                },
+              importLoaders: 1,
+              sourceMap: true,
+              onlyLocals: ctx.isServer,
+              modules: {
+                // Disallow global style exports so we can code-split CSS and
+                // not worry about loading order.
+                mode: 'pure',
+                // Generate a friendly production-ready name so it's
+                // reasonably understandable. The same name is used for
+                // development.
+                // TODO: Consider making production reduce this to a single
+                // character?
+                getLocalIdent: getCssModuleLocalIdent,
               },
             },
+            'sass-loader'
+          ),
+        },
+        // Opt-in support for SASS (using .scss or .sass extensions).
+        // By default we support SASS Modules with the
+        // extensions .module.scss or .module.sass
+        {
+          // CSS Modules should never have side effects. This setting will
+          // allow unused CSS to be removed from the production build.
+          // We ensure this by disallowing `:global()` CSS at the top-level
+          // via the `pure` mode in `css-loader`.
+          sideEffects: false,
+          test: /\.module\.(scss|sass)$/,
+          // CSS Modules are only supported in the user's application. We're
+          // not yet allowing CSS imports _within_ `node_modules`.
+          issuer: {
+            include: [ctx.rootDirectory],
+            exclude: /node_modules/,
+          },
 
-            // Compile CSS
+          use: getModuleStyleLoader(
             {
-              loader: require.resolve('postcss-loader'),
-              options: {
-                ident: '__nextjs_postcss',
-                plugins: postCssPlugins,
-                sourceMap: true,
+              importLoaders: 2,
+              sourceMap: true,
+              onlyLocals: ctx.isServer,
+              modules: {
+                // Disallow global style exports so we can code-split CSS and
+                // not worry about loading order.
+                mode: 'pure',
+                // Generate a friendly production-ready name so it's
+                // reasonably understandable. The same name is used for
+                // development.
+                // TODO: Consider making production reduce this to a single
+                // character?
+                getLocalIdent: getCssModuleLocalIdent,
               },
             },
-          ] as webpack.RuleSetUseItem[]).filter(Boolean),
+            'sass-loader'
+          ),
         },
       ],
     })
@@ -223,7 +284,7 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: /\.module\.css$/,
+          test: /\.module\.(css|scss|sass)$/,
           use: {
             loader: 'error-loader',
             options: {
@@ -238,7 +299,9 @@ export const css = curry(async function css(
   if (ctx.isServer) {
     fns.push(
       loader({
-        oneOf: [{ test: /\.css$/, use: require.resolve('ignore-loader') }],
+        oneOf: [
+          { test: /\.(css|scss|sass)$/, use: require.resolve('ignore-loader') },
+        ],
       })
     )
   } else if (ctx.customAppFile) {
@@ -254,6 +317,40 @@ export const css = curry(async function css(
             test: /\.css$/,
             issuer: { include: ctx.customAppFile },
 
+            use: [
+              // Add appropriate development more or production mode style
+              // loader
+              getClientStyleLoader({
+                isDevelopment: ctx.isDevelopment,
+                assetPrefix: ctx.assetPrefix,
+              }),
+
+              // Resolve CSS `@import`s and `url()`s
+              {
+                loader: require.resolve('css-loader'),
+                options: { importLoaders: 1, sourceMap: true },
+              },
+
+              // Compile CSS
+              {
+                loader: require.resolve('postcss-loader'),
+                options: {
+                  ident: '__nextjs_postcss',
+                  plugins: postCssPlugins,
+                  sourceMap: true,
+                },
+              },
+            ],
+          },
+          {
+            // A global CSS import always has side effects. Webpack will tree
+            // shake the CSS without this option if the issuer claims to have
+            // no side-effects.
+            // See https://github.com/webpack/webpack/issues/6571
+            sideEffects: true,
+            test: /\.(scss|sass)$/,
+            issuer: { include: ctx.customAppFile },
+
             use: [
               // Add appropriate development more or production mode style
               // loader
@@ -289,7 +386,7 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: /\.css$/,
+          test: /\.(css|scss|sass)$/,
           issuer: { include: [/node_modules/] },
           use: {
             loader: 'error-loader',
@@ -307,7 +404,7 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: /\.css$/,
+          test: /\.(css|scss|sass)$/,
           use: {
             loader: 'error-loader',
             options: {
diff --git a/packages/next/package.json b/packages/next/package.json
index 2ea73069d9756..f2235fdc645c3 100644
--- a/packages/next/package.json
+++ b/packages/next/package.json
@@ -123,6 +123,7 @@
     "raw-body": "2.4.0",
     "react-error-overlay": "5.1.6",
     "react-is": "16.8.6",
+    "sass-loader": "8.0.2",
     "send": "0.17.1",
     "source-map": "0.6.1",
     "string-hash": "1.1.3",

From 49f47aff5204bce374d5a37b9c62f8c88a17d7c5 Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Sun, 19 Jan 2020 11:55:50 +0100
Subject: [PATCH 02/34] Add copy of CSS tests for SCSS

---
 .../3rd-party-module/pages/index.js           |   5 +
 .../3rd-party-module/pages/index.module.scss  |  17 +
 .../.postcssrc.json                           |   3 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../styles/global.scss                        |  14 +
 .../.postcssrc.json                           |   3 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../styles/global.scss                        |  14 +
 .../.postcssrc.json                           |   3 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../styles/global.scss                        |  14 +
 .../.postcssrc.json                           |   3 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../styles/global.scss                        |  14 +
 .../.postcssrc.json                           |   3 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../styles/global.scss                        |  14 +
 .../.postcssrc.json                           |   1 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../styles/global.scss                        |  14 +
 .../.postcssrc.json                           |   3 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../styles/global.scss                        |  14 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../postcss.config.js                         |   3 +
 .../styles/global.scss                        |  14 +
 .../pages/_app.js                             |  12 +
 .../pages/index.js                            |   3 +
 .../postcss.config.js                         |   3 +
 .../styles/global.scss                        |   4 +
 .../bad-custom-configuration/.postcssrc.json  |  13 +
 .../bad-custom-configuration/pages/_app.js    |  12 +
 .../bad-custom-configuration/pages/index.js   |   3 +
 .../styles/global.scss                        |   4 +
 .../scss-fixtures/basic-module/pages/index.js |   9 +
 .../basic-module/pages/index.module.scss      |   3 +
 .../compilation-and-prefixing/pages/_app.js   |  12 +
 .../compilation-and-prefixing/pages/index.js  |   3 +
 .../styles/global.scss                        |   5 +
 .../composes-basic/pages/index.js             |   9 +
 .../composes-basic/pages/index.module.scss    |   9 +
 .../composes-external/pages/index.js          |   9 +
 .../composes-external/pages/index.module.scss |   4 +
 .../composes-external/pages/other.scss        |   4 +
 .../custom-configuration-arr/.postcssrc.json  |  16 +
 .../custom-configuration-arr/pages/_app.js    |  12 +
 .../custom-configuration-arr/pages/index.js   |   3 +
 .../styles/global.scss                        |  14 +
 .../next.config.js                            |  15 +
 .../custom-configuration-legacy/pages/_app.js |  12 +
 .../pages/index.js                            |   3 +
 .../postcss.config.js                         |  10 +
 .../styles/global.scss                        |  11 +
 .../custom-configuration/.postcssrc.json      |  11 +
 .../custom-configuration/pages/_app.js        |  12 +
 .../custom-configuration/pages/index.js       |   3 +
 .../custom-configuration/styles/global.scss   |  11 +
 .../scss-fixtures/dev-module/pages/index.js   |   9 +
 .../dev-module/pages/index.module.scss        |   3 +
 .../scss-fixtures/hmr-module/pages/index.js   |  15 +
 .../hmr-module/pages/index.module.scss        |   3 +
 .../node_modules/example/index.js             |   1 +
 .../node_modules/example/index.mjs            |   1 +
 .../node_modules/example/index.scss           |   3 +
 .../node_modules/example/package.json         |   4 +
 .../invalid-global-module/pages/index.js      |   7 +
 .../invalid-global-with-app/pages/_app.js     |  11 +
 .../invalid-global-with-app/pages/index.js    |   5 +
 .../styles/global.scss                        |   3 +
 .../invalid-global/pages/index.js             |   5 +
 .../invalid-global/styles/global.scss         |   3 +
 .../pages/_document.js                        |  23 +
 .../invalid-module-document/pages/index.js    |   3 +
 .../styles.module.scss                        |   3 +
 .../node_modules/example/index.js             |   1 +
 .../node_modules/example/index.mjs            |   1 +
 .../node_modules/example/index.module.scss    |   3 +
 .../node_modules/example/package.json         |   4 +
 .../invalid-module/pages/index.js             |   7 +
 .../multi-global-reversed/pages/_app.js       |  13 +
 .../multi-global-reversed/pages/index.js      |   3 +
 .../multi-global-reversed/styles/global1.scss |   3 +
 .../multi-global-reversed/styles/global2.scss |   3 +
 .../scss-fixtures/multi-global/pages/_app.js  |  13 +
 .../scss-fixtures/multi-global/pages/index.js |   3 +
 .../multi-global/styles/global1.scss          |   3 +
 .../multi-global/styles/global2.scss          |   3 +
 .../scss-fixtures/multi-module/pages/blue.js  |  20 +
 .../multi-module/pages/blue.module.scss       |   3 +
 .../scss-fixtures/multi-module/pages/none.js  |  19 +
 .../scss-fixtures/multi-module/pages/red.js   |  20 +
 .../multi-module/pages/red.module.scss        |   3 +
 .../scss-fixtures/multi-page/pages/_app.js    |  13 +
 .../scss-fixtures/multi-page/pages/page1.js   |  14 +
 .../scss-fixtures/multi-page/pages/page2.js   |  14 +
 .../multi-page/styles/global1.css             |   1 +
 .../multi-page/styles/global1.scss            |   3 +
 .../multi-page/styles/global2.scss            |   3 +
 .../scss-fixtures/nested-global/pages/_app.js |  13 +
 .../nested-global/pages/index.js              |   3 +
 .../nested-global/styles/global1.scss         |   5 +
 .../nested-global/styles/global1b.scss        |   4 +
 .../nested-global/styles/global2.scss         |   5 +
 .../nested-global/styles/global2b.scss        |   4 +
 test/integration/scss-fixtures/next.config.js |  10 +
 .../node_modules/example/index.js             |   3 +
 .../node_modules/example/index.mjs            |   1 +
 .../node_modules/example/index.module.scss    |   6 +
 .../node_modules/example/other.scss           |   6 +
 .../node_modules/example/other2.scss          |   3 +
 .../node_modules/example/other3.scss          |   3 +
 .../node_modules/example/package.json         |   4 +
 .../nm-module-nested/pages/index.js           |  12 +
 .../nm-module/node_modules/example/index.js   |   3 +
 .../nm-module/node_modules/example/index.mjs  |   1 +
 .../node_modules/example/index.module.scss    |   3 +
 .../node_modules/example/package.json         |   4 +
 .../scss-fixtures/nm-module/pages/index.js    |  12 +
 .../npm-import-bad/pages/_app.js              |  12 +
 .../npm-import-bad/pages/index.js             |   3 +
 .../npm-import-bad/styles/global.scss         |   1 +
 .../node_modules/example/index.js             |   3 +
 .../node_modules/example/index.mjs            |   1 +
 .../node_modules/example/other.scss           |   3 +
 .../node_modules/example/package.json         |   4 +
 .../node_modules/example/test.scss            |   5 +
 .../npm-import-nested/pages/_app.js           |  12 +
 .../npm-import-nested/pages/index.js          |   3 +
 .../npm-import-nested/styles/global.scss      |   1 +
 .../scss-fixtures/npm-import/pages/_app.js    |  12 +
 .../scss-fixtures/npm-import/pages/index.js   |   3 +
 .../npm-import/styles/global.scss             |   1 +
 .../scss-fixtures/prod-module/pages/index.js  |   9 +
 .../prod-module/pages/index.module.scss       |   3 +
 .../single-global-src/src/pages/_app.js       |  12 +
 .../single-global-src/src/pages/index.js      |   3 +
 .../single-global-src/styles/global.scss      |   3 +
 .../scss-fixtures/single-global/pages/_app.js |  12 +
 .../single-global/pages/index.js              |   3 +
 .../single-global/styles/global.scss          |   3 +
 .../scss-fixtures/unused/pages/index.js       |   3 +
 .../assets/light.svg                          |  17 +
 .../url-global-asset-prefix-1/next.config.js  |   5 +
 .../url-global-asset-prefix-1/pages/_app.js   |  13 +
 .../url-global-asset-prefix-1/pages/index.js  |   3 +
 .../url-global-asset-prefix-1/styles/dark.svg |  17 +
 .../styles/dark2.svg                          |  17 +
 .../styles/global1.scss                       |   4 +
 .../styles/global2.scss                       |   5 +
 .../styles/global2b.scss                      |   5 +
 .../assets/light.svg                          |  17 +
 .../url-global-asset-prefix-2/next.config.js  |   5 +
 .../url-global-asset-prefix-2/pages/_app.js   |  13 +
 .../url-global-asset-prefix-2/pages/index.js  |   3 +
 .../url-global-asset-prefix-2/styles/dark.svg |  17 +
 .../styles/dark2.svg                          |  17 +
 .../styles/global1.scss                       |   4 +
 .../styles/global2.scss                       |   5 +
 .../styles/global2b.scss                      |   5 +
 .../scss-fixtures/url-global/assets/light.svg |  17 +
 .../scss-fixtures/url-global/pages/_app.js    |  13 +
 .../scss-fixtures/url-global/pages/index.js   |   3 +
 .../scss-fixtures/url-global/styles/dark.svg  |  17 +
 .../scss-fixtures/url-global/styles/dark2.svg |  17 +
 .../url-global/styles/global1.scss            |   4 +
 .../url-global/styles/global2.scss            |   5 +
 .../url-global/styles/global2b.scss           |   5 +
 .../valid-and-invalid-global/pages/_app.js    |  12 +
 .../valid-and-invalid-global/pages/index.js   |   5 +
 .../styles/global.scss                        |   3 +
 .../with-styled-jsx/pages/_app.js             |  12 +
 .../with-styled-jsx/pages/index.js            |  12 +
 .../with-styled-jsx/styles/global.scss        |   3 +
 .../pages/_app.js                             |   5 +
 .../pages/index.js                            |  38 +
 .../postcss.config.js                         |  13 +
 .../styles/global.scss                        |   3 +
 .../with-tailwindcss/package.json             |   7 +
 .../with-tailwindcss/pages/_app.js            |   5 +
 .../with-tailwindcss/pages/index.js           |   3 +
 .../with-tailwindcss/styles/global.scss       |   3 +
 test/integration/scss/test/index.test.js      | 815 ++++++++++++++++++
 yarn.lock                                     |  35 +
 191 files changed, 2252 insertions(+)
 create mode 100644 test/integration/scss-fixtures/3rd-party-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/3rd-party-module/pages/index.module.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration/pages/index.js
 create mode 100644 test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/basic-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/basic-module/pages/index.module.scss
 create mode 100644 test/integration/scss-fixtures/compilation-and-prefixing/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/compilation-and-prefixing/pages/index.js
 create mode 100644 test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/composes-basic/pages/index.js
 create mode 100644 test/integration/scss-fixtures/composes-basic/pages/index.module.scss
 create mode 100644 test/integration/scss-fixtures/composes-external/pages/index.js
 create mode 100644 test/integration/scss-fixtures/composes-external/pages/index.module.scss
 create mode 100644 test/integration/scss-fixtures/composes-external/pages/other.scss
 create mode 100644 test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration-arr/pages/index.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/next.config.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/custom-configuration/.postcssrc.json
 create mode 100644 test/integration/scss-fixtures/custom-configuration/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration/pages/index.js
 create mode 100644 test/integration/scss-fixtures/custom-configuration/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/dev-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/dev-module/pages/index.module.scss
 create mode 100644 test/integration/scss-fixtures/hmr-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/hmr-module/pages/index.module.scss
 create mode 100644 test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.js
 create mode 100644 test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.mjs
 create mode 100644 test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.scss
 create mode 100644 test/integration/scss-fixtures/invalid-global-module/node_modules/example/package.json
 create mode 100644 test/integration/scss-fixtures/invalid-global-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/invalid-global-with-app/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/invalid-global-with-app/pages/index.js
 create mode 100644 test/integration/scss-fixtures/invalid-global-with-app/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/invalid-global/pages/index.js
 create mode 100644 test/integration/scss-fixtures/invalid-global/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/invalid-module-document/pages/_document.js
 create mode 100644 test/integration/scss-fixtures/invalid-module-document/pages/index.js
 create mode 100644 test/integration/scss-fixtures/invalid-module-document/styles.module.scss
 create mode 100644 test/integration/scss-fixtures/invalid-module/node_modules/example/index.js
 create mode 100644 test/integration/scss-fixtures/invalid-module/node_modules/example/index.mjs
 create mode 100644 test/integration/scss-fixtures/invalid-module/node_modules/example/index.module.scss
 create mode 100644 test/integration/scss-fixtures/invalid-module/node_modules/example/package.json
 create mode 100644 test/integration/scss-fixtures/invalid-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/multi-global-reversed/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/multi-global-reversed/pages/index.js
 create mode 100644 test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss
 create mode 100644 test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss
 create mode 100644 test/integration/scss-fixtures/multi-global/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/multi-global/pages/index.js
 create mode 100644 test/integration/scss-fixtures/multi-global/styles/global1.scss
 create mode 100644 test/integration/scss-fixtures/multi-global/styles/global2.scss
 create mode 100644 test/integration/scss-fixtures/multi-module/pages/blue.js
 create mode 100644 test/integration/scss-fixtures/multi-module/pages/blue.module.scss
 create mode 100644 test/integration/scss-fixtures/multi-module/pages/none.js
 create mode 100644 test/integration/scss-fixtures/multi-module/pages/red.js
 create mode 100644 test/integration/scss-fixtures/multi-module/pages/red.module.scss
 create mode 100644 test/integration/scss-fixtures/multi-page/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/multi-page/pages/page1.js
 create mode 100644 test/integration/scss-fixtures/multi-page/pages/page2.js
 create mode 100644 test/integration/scss-fixtures/multi-page/styles/global1.css
 create mode 100644 test/integration/scss-fixtures/multi-page/styles/global1.scss
 create mode 100644 test/integration/scss-fixtures/multi-page/styles/global2.scss
 create mode 100644 test/integration/scss-fixtures/nested-global/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/nested-global/pages/index.js
 create mode 100644 test/integration/scss-fixtures/nested-global/styles/global1.scss
 create mode 100644 test/integration/scss-fixtures/nested-global/styles/global1b.scss
 create mode 100644 test/integration/scss-fixtures/nested-global/styles/global2.scss
 create mode 100644 test/integration/scss-fixtures/nested-global/styles/global2b.scss
 create mode 100644 test/integration/scss-fixtures/next.config.js
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.js
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.mjs
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/node_modules/example/package.json
 create mode 100644 test/integration/scss-fixtures/nm-module-nested/pages/index.js
 create mode 100644 test/integration/scss-fixtures/nm-module/node_modules/example/index.js
 create mode 100644 test/integration/scss-fixtures/nm-module/node_modules/example/index.mjs
 create mode 100644 test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss
 create mode 100644 test/integration/scss-fixtures/nm-module/node_modules/example/package.json
 create mode 100644 test/integration/scss-fixtures/nm-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/npm-import-bad/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/npm-import-bad/pages/index.js
 create mode 100644 test/integration/scss-fixtures/npm-import-bad/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.js
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.mjs
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/node_modules/example/package.json
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/pages/index.js
 create mode 100644 test/integration/scss-fixtures/npm-import-nested/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/npm-import/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/npm-import/pages/index.js
 create mode 100644 test/integration/scss-fixtures/npm-import/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/prod-module/pages/index.js
 create mode 100644 test/integration/scss-fixtures/prod-module/pages/index.module.scss
 create mode 100644 test/integration/scss-fixtures/single-global-src/src/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/single-global-src/src/pages/index.js
 create mode 100644 test/integration/scss-fixtures/single-global-src/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/single-global/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/single-global/pages/index.js
 create mode 100644 test/integration/scss-fixtures/single-global/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/unused/pages/index.js
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/assets/light.svg
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/next.config.js
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/pages/index.js
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark.svg
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark2.svg
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/assets/light.svg
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/next.config.js
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/pages/index.js
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark.svg
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark2.svg
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss
 create mode 100644 test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss
 create mode 100644 test/integration/scss-fixtures/url-global/assets/light.svg
 create mode 100644 test/integration/scss-fixtures/url-global/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/url-global/pages/index.js
 create mode 100644 test/integration/scss-fixtures/url-global/styles/dark.svg
 create mode 100644 test/integration/scss-fixtures/url-global/styles/dark2.svg
 create mode 100644 test/integration/scss-fixtures/url-global/styles/global1.scss
 create mode 100644 test/integration/scss-fixtures/url-global/styles/global2.scss
 create mode 100644 test/integration/scss-fixtures/url-global/styles/global2b.scss
 create mode 100644 test/integration/scss-fixtures/valid-and-invalid-global/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/valid-and-invalid-global/pages/index.js
 create mode 100644 test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/with-styled-jsx/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/with-styled-jsx/pages/index.js
 create mode 100644 test/integration/scss-fixtures/with-styled-jsx/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/index.js
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss-and-purgecss/postcss.config.js
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss-and-purgecss/styles/global.scss
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss/package.json
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss/pages/_app.js
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss/pages/index.js
 create mode 100644 test/integration/scss-fixtures/with-tailwindcss/styles/global.scss
 create mode 100644 test/integration/scss/test/index.test.js

diff --git a/test/integration/scss-fixtures/3rd-party-module/pages/index.js b/test/integration/scss-fixtures/3rd-party-module/pages/index.js
new file mode 100644
index 0000000000000..57f5707a4c221
--- /dev/null
+++ b/test/integration/scss-fixtures/3rd-party-module/pages/index.js
@@ -0,0 +1,5 @@
+import { foo } from './index.module.scss'
+
+export default function Home() {
+  return <div id="verify-div" className={foo} />
+}
diff --git a/test/integration/scss-fixtures/3rd-party-module/pages/index.module.scss b/test/integration/scss-fixtures/3rd-party-module/pages/index.module.scss
new file mode 100644
index 0000000000000..99d63206009a1
--- /dev/null
+++ b/test/integration/scss-fixtures/3rd-party-module/pages/index.module.scss
@@ -0,0 +1,17 @@
+.foo {
+  position: relative;
+}
+
+.foo :global(.bar),
+.foo :global(.baz) {
+  height: 100%;
+  overflow: hidden;
+}
+
+.foo :global(.lol) {
+  width: 80%;
+}
+
+.foo > :global(.lel) {
+  width: 80%;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json
new file mode 100644
index 0000000000000..ab27508fd95ca
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["postcss-trolling"]]
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json
new file mode 100644
index 0000000000000..c6df57bdda0fa
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["postcss-trolling", null]]
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json
new file mode 100644
index 0000000000000..e886576085efd
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [[5, null]]
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json
new file mode 100644
index 0000000000000..05e159725dc23
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [5]
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json
new file mode 100644
index 0000000000000..1e02e994a48d5
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json
@@ -0,0 +1,3 @@
+{
+  "plugins": null
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json
new file mode 100644
index 0000000000000..0967ef424bce6
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json
@@ -0,0 +1 @@
+{}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json
new file mode 100644
index 0000000000000..561d0cb76ddf9
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json
@@ -0,0 +1,3 @@
+{
+  "plugins": [["postcss-trolling", 5]]
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js
new file mode 100644
index 0000000000000..5f1f2140125eb
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js
@@ -0,0 +1,3 @@
+module.exports = {
+  plugins: [require('postcss-trolling')],
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js b/test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js
new file mode 100644
index 0000000000000..9bf5d079edf9b
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js
@@ -0,0 +1,3 @@
+module.exports = function() {
+  return { plugins: [] }
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss
new file mode 100644
index 0000000000000..e535e1983057d
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss
@@ -0,0 +1,4 @@
+/* this should be transformed to width/height */
+.video {
+  max-size: 400px 300px;
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json
new file mode 100644
index 0000000000000..8c058dc78d1e0
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json
@@ -0,0 +1,13 @@
+{
+  "sourceMap": false,
+  "plugins": {
+    "postcss-modules-extract-imports": {},
+    "postcss-modules-local-by-default": {},
+    "postcss-modules-scope": {},
+    "postcss-modules-values": {},
+    "postcss-modules": {},
+
+    // Test a non-standard feature that wouldn't be normally enabled
+    "postcss-short-size": {}
+  }
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss
new file mode 100644
index 0000000000000..e535e1983057d
--- /dev/null
+++ b/test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss
@@ -0,0 +1,4 @@
+/* this should be transformed to width/height */
+.video {
+  max-size: 400px 300px;
+}
diff --git a/test/integration/scss-fixtures/basic-module/pages/index.js b/test/integration/scss-fixtures/basic-module/pages/index.js
new file mode 100644
index 0000000000000..7b42859a67e32
--- /dev/null
+++ b/test/integration/scss-fixtures/basic-module/pages/index.js
@@ -0,0 +1,9 @@
+import { redText } from './index.module.scss'
+
+export default function Home() {
+  return (
+    <div id="verify-red" className={redText}>
+      This text should be red.
+    </div>
+  )
+}
diff --git a/test/integration/scss-fixtures/basic-module/pages/index.module.scss b/test/integration/scss-fixtures/basic-module/pages/index.module.scss
new file mode 100644
index 0000000000000..08a38e09ef8ea
--- /dev/null
+++ b/test/integration/scss-fixtures/basic-module/pages/index.module.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/compilation-and-prefixing/pages/_app.js b/test/integration/scss-fixtures/compilation-and-prefixing/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/compilation-and-prefixing/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/compilation-and-prefixing/pages/index.js b/test/integration/scss-fixtures/compilation-and-prefixing/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/compilation-and-prefixing/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss b/test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss
new file mode 100644
index 0000000000000..19e8290b4cd41
--- /dev/null
+++ b/test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss
@@ -0,0 +1,5 @@
+@media (480px <= width < 768px) {
+  ::placeholder {
+    color: green;
+  }
+}
diff --git a/test/integration/scss-fixtures/composes-basic/pages/index.js b/test/integration/scss-fixtures/composes-basic/pages/index.js
new file mode 100644
index 0000000000000..0af8621c4649a
--- /dev/null
+++ b/test/integration/scss-fixtures/composes-basic/pages/index.js
@@ -0,0 +1,9 @@
+import { subClass } from './index.module.scss'
+
+export default function Home() {
+  return (
+    <div id="verify-yellow" className={subClass}>
+      This text should be yellow on blue.
+    </div>
+  )
+}
diff --git a/test/integration/scss-fixtures/composes-basic/pages/index.module.scss b/test/integration/scss-fixtures/composes-basic/pages/index.module.scss
new file mode 100644
index 0000000000000..0999b553172d8
--- /dev/null
+++ b/test/integration/scss-fixtures/composes-basic/pages/index.module.scss
@@ -0,0 +1,9 @@
+.className {
+  background: red;
+  color: yellow;
+}
+
+.subClass {
+  composes: className;
+  background: blue;
+}
diff --git a/test/integration/scss-fixtures/composes-external/pages/index.js b/test/integration/scss-fixtures/composes-external/pages/index.js
new file mode 100644
index 0000000000000..0af8621c4649a
--- /dev/null
+++ b/test/integration/scss-fixtures/composes-external/pages/index.js
@@ -0,0 +1,9 @@
+import { subClass } from './index.module.scss'
+
+export default function Home() {
+  return (
+    <div id="verify-yellow" className={subClass}>
+      This text should be yellow on blue.
+    </div>
+  )
+}
diff --git a/test/integration/scss-fixtures/composes-external/pages/index.module.scss b/test/integration/scss-fixtures/composes-external/pages/index.module.scss
new file mode 100644
index 0000000000000..373385ec2f693
--- /dev/null
+++ b/test/integration/scss-fixtures/composes-external/pages/index.module.scss
@@ -0,0 +1,4 @@
+.subClass {
+  composes: className from './other.scss';
+  background: blue;
+}
diff --git a/test/integration/scss-fixtures/composes-external/pages/other.scss b/test/integration/scss-fixtures/composes-external/pages/other.scss
new file mode 100644
index 0000000000000..6c6bc72eae403
--- /dev/null
+++ b/test/integration/scss-fixtures/composes-external/pages/other.scss
@@ -0,0 +1,4 @@
+.className {
+  background: red;
+  color: yellow;
+}
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json b/test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json
new file mode 100644
index 0000000000000..def6136b4cdc8
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json
@@ -0,0 +1,16 @@
+{
+  // Use comments to test JSON5 support
+  "plugins": [
+    "pixrem",
+    ["postcss-pseudoelements", true],
+    // Test a non-standard feature that wouldn't be normally enabled
+    [
+      "postcss-short-size",
+      {
+        // Add a prefix to test that configuration is passed
+        "prefix": "xyz"
+      }
+    ],
+    ["postcss-trolling", false]
+  ]
+}
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js b/test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/pages/index.js b/test/integration/scss-fixtures/custom-configuration-arr/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-arr/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss b/test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss
new file mode 100644
index 0000000000000..78d27f7edd8e4
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss
@@ -0,0 +1,14 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  a::before {
+    content: '';
+  }
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400rem 300rem;
+}
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/next.config.js b/test/integration/scss-fixtures/custom-configuration-legacy/next.config.js
new file mode 100644
index 0000000000000..93bc6a48f6b17
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-legacy/next.config.js
@@ -0,0 +1,15 @@
+const withCSS = require('@zeit/next-css')
+
+module.exports = withCSS({
+  onDemandEntries: {
+    // Make sure entries are not getting disposed.
+    maxInactiveAge: 1000 * 60 * 60,
+  },
+  experimental: {
+    css: true,
+  },
+  webpack(cfg) {
+    cfg.devtool = 'source-map'
+    return cfg
+  },
+})
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js b/test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js b/test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js b/test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js
new file mode 100644
index 0000000000000..c7b7fde03c78c
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js
@@ -0,0 +1,10 @@
+module.exports = {
+  // Use comments to test JSON5 support
+  plugins: [
+    // Test a non-standard feature that wouldn't be normally enabled
+    require('postcss-short-size')({
+      // Add a prefix to test that configuration is passed
+      prefix: 'xyz',
+    }),
+  ],
+}
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss b/test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss
new file mode 100644
index 0000000000000..f942036ad16ef
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss
@@ -0,0 +1,11 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400px 300px;
+}
diff --git a/test/integration/scss-fixtures/custom-configuration/.postcssrc.json b/test/integration/scss-fixtures/custom-configuration/.postcssrc.json
new file mode 100644
index 0000000000000..21cd2f23012bd
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration/.postcssrc.json
@@ -0,0 +1,11 @@
+{
+  // Use comments to test JSON5 support
+  "plugins": {
+    // Test a non-standard feature that wouldn't be normally enabled
+    "postcss-short-size": {
+      // Add a prefix to test that configuration is passed
+      "prefix": "xyz"
+    },
+    "postcss-trolling": false
+  }
+}
diff --git a/test/integration/scss-fixtures/custom-configuration/pages/_app.js b/test/integration/scss-fixtures/custom-configuration/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/custom-configuration/pages/index.js b/test/integration/scss-fixtures/custom-configuration/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/custom-configuration/styles/global.scss b/test/integration/scss-fixtures/custom-configuration/styles/global.scss
new file mode 100644
index 0000000000000..f942036ad16ef
--- /dev/null
+++ b/test/integration/scss-fixtures/custom-configuration/styles/global.scss
@@ -0,0 +1,11 @@
+/* this should pass through untransformed */
+@media (480px <= width < 768px) {
+  ::placeholder {
+    color: green;
+  }
+}
+
+/* this should be transformed to width/height */
+.video {
+  -xyz-max-size: 400px 300px;
+}
diff --git a/test/integration/scss-fixtures/dev-module/pages/index.js b/test/integration/scss-fixtures/dev-module/pages/index.js
new file mode 100644
index 0000000000000..7b42859a67e32
--- /dev/null
+++ b/test/integration/scss-fixtures/dev-module/pages/index.js
@@ -0,0 +1,9 @@
+import { redText } from './index.module.scss'
+
+export default function Home() {
+  return (
+    <div id="verify-red" className={redText}>
+      This text should be red.
+    </div>
+  )
+}
diff --git a/test/integration/scss-fixtures/dev-module/pages/index.module.scss b/test/integration/scss-fixtures/dev-module/pages/index.module.scss
new file mode 100644
index 0000000000000..08a38e09ef8ea
--- /dev/null
+++ b/test/integration/scss-fixtures/dev-module/pages/index.module.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/hmr-module/pages/index.js b/test/integration/scss-fixtures/hmr-module/pages/index.js
new file mode 100644
index 0000000000000..18a31282f756c
--- /dev/null
+++ b/test/integration/scss-fixtures/hmr-module/pages/index.js
@@ -0,0 +1,15 @@
+import { redText } from './index.module.scss'
+
+function Home() {
+  return (
+    <>
+      <div id="verify-red" className={redText}>
+        This text should be red.
+      </div>
+      <br />
+      <input key={'' + Math.random()} id="text-input" type="text" />
+    </>
+  )
+}
+
+export default Home
diff --git a/test/integration/scss-fixtures/hmr-module/pages/index.module.scss b/test/integration/scss-fixtures/hmr-module/pages/index.module.scss
new file mode 100644
index 0000000000000..08a38e09ef8ea
--- /dev/null
+++ b/test/integration/scss-fixtures/hmr-module/pages/index.module.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.js b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.js
new file mode 100644
index 0000000000000..4a5b22813be5a
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.js
@@ -0,0 +1 @@
+require('./index.scss')
diff --git a/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.mjs b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.mjs
new file mode 100644
index 0000000000000..63810a6819f33
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.mjs
@@ -0,0 +1 @@
+import './index.scss'
diff --git a/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.scss b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.scss
new file mode 100644
index 0000000000000..f77fe0ef0bdbe
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/index.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: 'red';
+}
diff --git a/test/integration/scss-fixtures/invalid-global-module/node_modules/example/package.json b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/package.json
new file mode 100644
index 0000000000000..ab5f2cd4a1cf7
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-module/node_modules/example/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "example",
+  "main": "index"
+}
diff --git a/test/integration/scss-fixtures/invalid-global-module/pages/index.js b/test/integration/scss-fixtures/invalid-global-module/pages/index.js
new file mode 100644
index 0000000000000..9a79166027dd7
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-module/pages/index.js
@@ -0,0 +1,7 @@
+import 'example'
+
+function Home() {
+  return <div>This should fail at build time.</div>
+}
+
+export default Home
diff --git a/test/integration/scss-fixtures/invalid-global-with-app/pages/_app.js b/test/integration/scss-fixtures/invalid-global-with-app/pages/_app.js
new file mode 100644
index 0000000000000..68b8ee24d7fd5
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-with-app/pages/_app.js
@@ -0,0 +1,11 @@
+import React from 'react'
+import App from 'next/app'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/invalid-global-with-app/pages/index.js b/test/integration/scss-fixtures/invalid-global-with-app/pages/index.js
new file mode 100644
index 0000000000000..38d46eb2a45eb
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-with-app/pages/index.js
@@ -0,0 +1,5 @@
+import '../styles/global.scss'
+
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/invalid-global-with-app/styles/global.scss b/test/integration/scss-fixtures/invalid-global-with-app/styles/global.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global-with-app/styles/global.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/invalid-global/pages/index.js b/test/integration/scss-fixtures/invalid-global/pages/index.js
new file mode 100644
index 0000000000000..38d46eb2a45eb
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global/pages/index.js
@@ -0,0 +1,5 @@
+import '../styles/global.scss'
+
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/invalid-global/styles/global.scss b/test/integration/scss-fixtures/invalid-global/styles/global.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-global/styles/global.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/invalid-module-document/pages/_document.js b/test/integration/scss-fixtures/invalid-module-document/pages/_document.js
new file mode 100644
index 0000000000000..a14aca67a844d
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module-document/pages/_document.js
@@ -0,0 +1,23 @@
+import Document, { Head, Html, Main, NextScript } from 'next/document'
+import styles from '../styles.module.scss'
+
+class MyDocument extends Document {
+  static async getInitialProps(ctx) {
+    const initialProps = await Document.getInitialProps(ctx)
+    return { ...initialProps }
+  }
+
+  render() {
+    return (
+      <Html>
+        <Head />
+        <body className={styles['red-text']}>
+          <Main />
+          <NextScript />
+        </body>
+      </Html>
+    )
+  }
+}
+
+export default MyDocument
diff --git a/test/integration/scss-fixtures/invalid-module-document/pages/index.js b/test/integration/scss-fixtures/invalid-module-document/pages/index.js
new file mode 100644
index 0000000000000..08fe48e9b56c8
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module-document/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div>Hello</div>
+}
diff --git a/test/integration/scss-fixtures/invalid-module-document/styles.module.scss b/test/integration/scss-fixtures/invalid-module-document/styles.module.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module-document/styles.module.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/invalid-module/node_modules/example/index.js b/test/integration/scss-fixtures/invalid-module/node_modules/example/index.js
new file mode 100644
index 0000000000000..a8023d4c7c1bf
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module/node_modules/example/index.js
@@ -0,0 +1 @@
+module.exports = require('./index.module.scss')
diff --git a/test/integration/scss-fixtures/invalid-module/node_modules/example/index.mjs b/test/integration/scss-fixtures/invalid-module/node_modules/example/index.mjs
new file mode 100644
index 0000000000000..f72c6d4acfbe2
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module/node_modules/example/index.mjs
@@ -0,0 +1 @@
+export * from './index.module.scss'
diff --git a/test/integration/scss-fixtures/invalid-module/node_modules/example/index.module.scss b/test/integration/scss-fixtures/invalid-module/node_modules/example/index.module.scss
new file mode 100644
index 0000000000000..f77fe0ef0bdbe
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module/node_modules/example/index.module.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: 'red';
+}
diff --git a/test/integration/scss-fixtures/invalid-module/node_modules/example/package.json b/test/integration/scss-fixtures/invalid-module/node_modules/example/package.json
new file mode 100644
index 0000000000000..ab5f2cd4a1cf7
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module/node_modules/example/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "example",
+  "main": "index"
+}
diff --git a/test/integration/scss-fixtures/invalid-module/pages/index.js b/test/integration/scss-fixtures/invalid-module/pages/index.js
new file mode 100644
index 0000000000000..83fa4e1381b64
--- /dev/null
+++ b/test/integration/scss-fixtures/invalid-module/pages/index.js
@@ -0,0 +1,7 @@
+import * as classes from 'example'
+
+function Home() {
+  return <div>This should fail at build time {JSON.stringify(classes)}.</div>
+}
+
+export default Home
diff --git a/test/integration/scss-fixtures/multi-global-reversed/pages/_app.js b/test/integration/scss-fixtures/multi-global-reversed/pages/_app.js
new file mode 100644
index 0000000000000..dc344a9bd9d27
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global-reversed/pages/_app.js
@@ -0,0 +1,13 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global2.scss'
+import '../styles/global1.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/multi-global-reversed/pages/index.js b/test/integration/scss-fixtures/multi-global-reversed/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global-reversed/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss b/test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss b/test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss
new file mode 100644
index 0000000000000..9d1af6c0f6db1
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss
@@ -0,0 +1,3 @@
+.blue-text {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/multi-global/pages/_app.js b/test/integration/scss-fixtures/multi-global/pages/_app.js
new file mode 100644
index 0000000000000..29beb9fdb3cc5
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global/pages/_app.js
@@ -0,0 +1,13 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global1.scss'
+import '../styles/global2.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/multi-global/pages/index.js b/test/integration/scss-fixtures/multi-global/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/multi-global/styles/global1.scss b/test/integration/scss-fixtures/multi-global/styles/global1.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global/styles/global1.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/multi-global/styles/global2.scss b/test/integration/scss-fixtures/multi-global/styles/global2.scss
new file mode 100644
index 0000000000000..9d1af6c0f6db1
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-global/styles/global2.scss
@@ -0,0 +1,3 @@
+.blue-text {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/multi-module/pages/blue.js b/test/integration/scss-fixtures/multi-module/pages/blue.js
new file mode 100644
index 0000000000000..1c45c34e41a84
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-module/pages/blue.js
@@ -0,0 +1,20 @@
+import Link from 'next/link'
+import { blueText } from './blue.module.scss'
+
+export default function Blue() {
+  return (
+    <>
+      <div id="verify-blue" className={blueText}>
+        This text should be blue.
+      </div>
+      <br />
+      <Link href="/red" prefetch>
+        <a id="link-red">Red</a>
+      </Link>
+      <br />
+      <Link href="/none" prefetch={false}>
+        <a id="link-none">None</a>
+      </Link>
+    </>
+  )
+}
diff --git a/test/integration/scss-fixtures/multi-module/pages/blue.module.scss b/test/integration/scss-fixtures/multi-module/pages/blue.module.scss
new file mode 100644
index 0000000000000..4c5ac28ce4ef8
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-module/pages/blue.module.scss
@@ -0,0 +1,3 @@
+.blueText {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/multi-module/pages/none.js b/test/integration/scss-fixtures/multi-module/pages/none.js
new file mode 100644
index 0000000000000..f26c2d80b3ae0
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-module/pages/none.js
@@ -0,0 +1,19 @@
+import Link from 'next/link'
+
+export default function None() {
+  return (
+    <>
+      <div id="verify-black" style={{ color: 'black' }}>
+        This text should be black.
+      </div>
+      <br />
+      <Link href="/red" prefetch={false}>
+        <a id="link-red">Red</a>
+      </Link>
+      <br />
+      <Link href="/blue" prefetch={false}>
+        <a id="link-blue">Blue</a>
+      </Link>
+    </>
+  )
+}
diff --git a/test/integration/scss-fixtures/multi-module/pages/red.js b/test/integration/scss-fixtures/multi-module/pages/red.js
new file mode 100644
index 0000000000000..af8b699159986
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-module/pages/red.js
@@ -0,0 +1,20 @@
+import Link from 'next/link'
+import { redText } from './red.module.scss'
+
+export default function Red() {
+  return (
+    <>
+      <div id="verify-red" className={redText}>
+        This text should be red.
+      </div>
+      <br />
+      <Link href="/blue" prefetch={false}>
+        <a id="link-blue">Blue</a>
+      </Link>
+      <br />
+      <Link href="/none" prefetch={false}>
+        <a id="link-none">None</a>
+      </Link>
+    </>
+  )
+}
diff --git a/test/integration/scss-fixtures/multi-module/pages/red.module.scss b/test/integration/scss-fixtures/multi-module/pages/red.module.scss
new file mode 100644
index 0000000000000..08a38e09ef8ea
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-module/pages/red.module.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/multi-page/pages/_app.js b/test/integration/scss-fixtures/multi-page/pages/_app.js
new file mode 100644
index 0000000000000..29beb9fdb3cc5
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-page/pages/_app.js
@@ -0,0 +1,13 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global1.scss'
+import '../styles/global2.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/multi-page/pages/page1.js b/test/integration/scss-fixtures/multi-page/pages/page1.js
new file mode 100644
index 0000000000000..94b9d0f24ca37
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-page/pages/page1.js
@@ -0,0 +1,14 @@
+import Link from 'next/link'
+export default function Page1() {
+  return (
+    <>
+      <div className="red-text">This text should be red.</div>
+      <br />
+      <input key={'' + Math.random()} id="text-input" type="text" />
+      <br />
+      <Link href="/page2">
+        <a>Switch page</a>
+      </Link>
+    </>
+  )
+}
diff --git a/test/integration/scss-fixtures/multi-page/pages/page2.js b/test/integration/scss-fixtures/multi-page/pages/page2.js
new file mode 100644
index 0000000000000..e8e49a87514dc
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-page/pages/page2.js
@@ -0,0 +1,14 @@
+import Link from 'next/link'
+export default function Page2() {
+  return (
+    <>
+      <div className="blue-text">This text should be blue.</div>
+      <br />
+      <input key={'' + Math.random()} id="text-input" type="text" />
+      <br />
+      <Link href="/page1">
+        <a>Switch page</a>
+      </Link>
+    </>
+  )
+}
diff --git a/test/integration/scss-fixtures/multi-page/styles/global1.css b/test/integration/scss-fixtures/multi-page/styles/global1.css
new file mode 100644
index 0000000000000..ec747fa47ddb8
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-page/styles/global1.css
@@ -0,0 +1 @@
+null
\ No newline at end of file
diff --git a/test/integration/scss-fixtures/multi-page/styles/global1.scss b/test/integration/scss-fixtures/multi-page/styles/global1.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-page/styles/global1.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/multi-page/styles/global2.scss b/test/integration/scss-fixtures/multi-page/styles/global2.scss
new file mode 100644
index 0000000000000..9d1af6c0f6db1
--- /dev/null
+++ b/test/integration/scss-fixtures/multi-page/styles/global2.scss
@@ -0,0 +1,3 @@
+.blue-text {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/nested-global/pages/_app.js b/test/integration/scss-fixtures/nested-global/pages/_app.js
new file mode 100644
index 0000000000000..29beb9fdb3cc5
--- /dev/null
+++ b/test/integration/scss-fixtures/nested-global/pages/_app.js
@@ -0,0 +1,13 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global1.scss'
+import '../styles/global2.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/nested-global/pages/index.js b/test/integration/scss-fixtures/nested-global/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/nested-global/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/nested-global/styles/global1.scss b/test/integration/scss-fixtures/nested-global/styles/global1.scss
new file mode 100644
index 0000000000000..c6abef272702d
--- /dev/null
+++ b/test/integration/scss-fixtures/nested-global/styles/global1.scss
@@ -0,0 +1,5 @@
+@import './global1b.scss';
+
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/nested-global/styles/global1b.scss b/test/integration/scss-fixtures/nested-global/styles/global1b.scss
new file mode 100644
index 0000000000000..3902bc9032e31
--- /dev/null
+++ b/test/integration/scss-fixtures/nested-global/styles/global1b.scss
@@ -0,0 +1,4 @@
+.red-text {
+  color: purple;
+  font-weight: bolder;
+}
diff --git a/test/integration/scss-fixtures/nested-global/styles/global2.scss b/test/integration/scss-fixtures/nested-global/styles/global2.scss
new file mode 100644
index 0000000000000..37e7107172397
--- /dev/null
+++ b/test/integration/scss-fixtures/nested-global/styles/global2.scss
@@ -0,0 +1,5 @@
+@import './global2b.scss';
+
+.blue-text {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/nested-global/styles/global2b.scss b/test/integration/scss-fixtures/nested-global/styles/global2b.scss
new file mode 100644
index 0000000000000..56bea0235b8ac
--- /dev/null
+++ b/test/integration/scss-fixtures/nested-global/styles/global2b.scss
@@ -0,0 +1,4 @@
+.blue-text {
+  color: orange;
+  font-weight: bolder;
+}
diff --git a/test/integration/scss-fixtures/next.config.js b/test/integration/scss-fixtures/next.config.js
new file mode 100644
index 0000000000000..2a0ee47afec3c
--- /dev/null
+++ b/test/integration/scss-fixtures/next.config.js
@@ -0,0 +1,10 @@
+module.exports = {
+  onDemandEntries: {
+    // Make sure entries are not getting disposed.
+    maxInactiveAge: 1000 * 60 * 60,
+  },
+  webpack(cfg) {
+    cfg.devtool = 'source-map'
+    return cfg
+  },
+}
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.js b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.js
new file mode 100644
index 0000000000000..7d1fdcb8879d9
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.js
@@ -0,0 +1,3 @@
+const message = 'Why hello there'
+
+module.exports = { message }
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.mjs b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.mjs
new file mode 100644
index 0000000000000..a81498ed3ad53
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.mjs
@@ -0,0 +1 @@
+export const message = 'Why hello there'
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
new file mode 100644
index 0000000000000..aed5852ba6873
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
@@ -0,0 +1,6 @@
+@import 'other2.scss';
+
+.subClass {
+  composes: className from './other.scss';
+  background: blue;
+}
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
new file mode 100644
index 0000000000000..d8eb83346a6ea
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
@@ -0,0 +1,6 @@
+@import 'other3.scss';
+
+.className {
+  background: red;
+  color: yellow;
+}
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
new file mode 100644
index 0000000000000..3edf8b085d62b
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
@@ -0,0 +1,3 @@
+.other2 {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
new file mode 100644
index 0000000000000..3bff2788064f9
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
@@ -0,0 +1,3 @@
+.other3 {
+  color: violet;
+}
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/package.json b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/package.json
new file mode 100644
index 0000000000000..ab5f2cd4a1cf7
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "example",
+  "main": "index"
+}
diff --git a/test/integration/scss-fixtures/nm-module-nested/pages/index.js b/test/integration/scss-fixtures/nm-module-nested/pages/index.js
new file mode 100644
index 0000000000000..897696bd01572
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module-nested/pages/index.js
@@ -0,0 +1,12 @@
+import * as data from 'example'
+import * as classes from 'example/index.module.scss'
+
+function Home() {
+  return (
+    <div id="nm-div">
+      {JSON.stringify(data)} {JSON.stringify(classes)}
+    </div>
+  )
+}
+
+export default Home
diff --git a/test/integration/scss-fixtures/nm-module/node_modules/example/index.js b/test/integration/scss-fixtures/nm-module/node_modules/example/index.js
new file mode 100644
index 0000000000000..7d1fdcb8879d9
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module/node_modules/example/index.js
@@ -0,0 +1,3 @@
+const message = 'Why hello there'
+
+module.exports = { message }
diff --git a/test/integration/scss-fixtures/nm-module/node_modules/example/index.mjs b/test/integration/scss-fixtures/nm-module/node_modules/example/index.mjs
new file mode 100644
index 0000000000000..a81498ed3ad53
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module/node_modules/example/index.mjs
@@ -0,0 +1 @@
+export const message = 'Why hello there'
diff --git a/test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss b/test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss
new file mode 100644
index 0000000000000..f77fe0ef0bdbe
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: 'red';
+}
diff --git a/test/integration/scss-fixtures/nm-module/node_modules/example/package.json b/test/integration/scss-fixtures/nm-module/node_modules/example/package.json
new file mode 100644
index 0000000000000..ab5f2cd4a1cf7
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module/node_modules/example/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "example",
+  "main": "index"
+}
diff --git a/test/integration/scss-fixtures/nm-module/pages/index.js b/test/integration/scss-fixtures/nm-module/pages/index.js
new file mode 100644
index 0000000000000..897696bd01572
--- /dev/null
+++ b/test/integration/scss-fixtures/nm-module/pages/index.js
@@ -0,0 +1,12 @@
+import * as data from 'example'
+import * as classes from 'example/index.module.scss'
+
+function Home() {
+  return (
+    <div id="nm-div">
+      {JSON.stringify(data)} {JSON.stringify(classes)}
+    </div>
+  )
+}
+
+export default Home
diff --git a/test/integration/scss-fixtures/npm-import-bad/pages/_app.js b/test/integration/scss-fixtures/npm-import-bad/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-bad/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/npm-import-bad/pages/index.js b/test/integration/scss-fixtures/npm-import-bad/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-bad/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/npm-import-bad/styles/global.scss b/test/integration/scss-fixtures/npm-import-bad/styles/global.scss
new file mode 100644
index 0000000000000..8e799fdddaeec
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-bad/styles/global.scss
@@ -0,0 +1 @@
+@import 'nprogress/nprogress.scss';
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.js b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.js
new file mode 100644
index 0000000000000..7d1fdcb8879d9
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.js
@@ -0,0 +1,3 @@
+const message = 'Why hello there'
+
+module.exports = { message }
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.mjs b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.mjs
new file mode 100644
index 0000000000000..a81498ed3ad53
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/index.mjs
@@ -0,0 +1 @@
+export const message = 'Why hello there'
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss
new file mode 100644
index 0000000000000..eefdaa510cfa8
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss
@@ -0,0 +1,3 @@
+.other {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/package.json b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/package.json
new file mode 100644
index 0000000000000..ab5f2cd4a1cf7
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "example",
+  "main": "index"
+}
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
new file mode 100644
index 0000000000000..57ac6959e15d3
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
@@ -0,0 +1,5 @@
+@import url('other.scss');
+
+.test {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/npm-import-nested/pages/_app.js b/test/integration/scss-fixtures/npm-import-nested/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/npm-import-nested/pages/index.js b/test/integration/scss-fixtures/npm-import-nested/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/npm-import-nested/styles/global.scss b/test/integration/scss-fixtures/npm-import-nested/styles/global.scss
new file mode 100644
index 0000000000000..fb61b329db5f7
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import-nested/styles/global.scss
@@ -0,0 +1 @@
+@import '~example/test.scss';
diff --git a/test/integration/scss-fixtures/npm-import/pages/_app.js b/test/integration/scss-fixtures/npm-import/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/npm-import/pages/index.js b/test/integration/scss-fixtures/npm-import/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/npm-import/styles/global.scss b/test/integration/scss-fixtures/npm-import/styles/global.scss
new file mode 100644
index 0000000000000..a3bfbdf7d6700
--- /dev/null
+++ b/test/integration/scss-fixtures/npm-import/styles/global.scss
@@ -0,0 +1 @@
+@import '~nprogress/nprogress.scss';
diff --git a/test/integration/scss-fixtures/prod-module/pages/index.js b/test/integration/scss-fixtures/prod-module/pages/index.js
new file mode 100644
index 0000000000000..7b42859a67e32
--- /dev/null
+++ b/test/integration/scss-fixtures/prod-module/pages/index.js
@@ -0,0 +1,9 @@
+import { redText } from './index.module.scss'
+
+export default function Home() {
+  return (
+    <div id="verify-red" className={redText}>
+      This text should be red.
+    </div>
+  )
+}
diff --git a/test/integration/scss-fixtures/prod-module/pages/index.module.scss b/test/integration/scss-fixtures/prod-module/pages/index.module.scss
new file mode 100644
index 0000000000000..08a38e09ef8ea
--- /dev/null
+++ b/test/integration/scss-fixtures/prod-module/pages/index.module.scss
@@ -0,0 +1,3 @@
+.redText {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/single-global-src/src/pages/_app.js b/test/integration/scss-fixtures/single-global-src/src/pages/_app.js
new file mode 100644
index 0000000000000..13558a96f8e8a
--- /dev/null
+++ b/test/integration/scss-fixtures/single-global-src/src/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/single-global-src/src/pages/index.js b/test/integration/scss-fixtures/single-global-src/src/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/single-global-src/src/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/single-global-src/styles/global.scss b/test/integration/scss-fixtures/single-global-src/styles/global.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/single-global-src/styles/global.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/single-global/pages/_app.js b/test/integration/scss-fixtures/single-global/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/single-global/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/single-global/pages/index.js b/test/integration/scss-fixtures/single-global/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/single-global/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/single-global/styles/global.scss b/test/integration/scss-fixtures/single-global/styles/global.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/single-global/styles/global.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/unused/pages/index.js b/test/integration/scss-fixtures/unused/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/unused/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/assets/light.svg b/test/integration/scss-fixtures/url-global-asset-prefix-1/assets/light.svg
new file mode 100644
index 0000000000000..0194cbce06561
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/assets/light.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="113px" height="100px" viewBox="0 0 113 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - White</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="196.572434%" y1="228.815483%" x2="50%" y2="50%" id="linearGradient-1">
+            <stop stop-color="#000000" offset="0%"></stop>
+            <stop stop-color="#FFFFFF" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="White-Triangle" transform="translate(-294.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---White" points="350.5 150 407 250 294 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/next.config.js b/test/integration/scss-fixtures/url-global-asset-prefix-1/next.config.js
new file mode 100644
index 0000000000000..177a5d7903f16
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/next.config.js
@@ -0,0 +1,5 @@
+const config = require('../next.config.js')
+module.exports = {
+  ...config,
+  assetPrefix: '/foo/',
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/pages/_app.js b/test/integration/scss-fixtures/url-global-asset-prefix-1/pages/_app.js
new file mode 100644
index 0000000000000..29beb9fdb3cc5
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/pages/_app.js
@@ -0,0 +1,13 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global1.scss'
+import '../styles/global2.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/pages/index.js b/test/integration/scss-fixtures/url-global-asset-prefix-1/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark.svg b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark.svg
new file mode 100644
index 0000000000000..bdae3d6587872
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="114px" height="100px" viewBox="0 0 114 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - Black</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="100.929941%" y1="181.283245%" x2="41.7687834%" y2="100%" id="linearGradient-1">
+            <stop stop-color="#FFFFFF" offset="0%"></stop>
+            <stop stop-color="#000000" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Black-Triangle" transform="translate(-293.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---Black" points="350 150 407 250 293 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark2.svg b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark2.svg
new file mode 100644
index 0000000000000..bdae3d6587872
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/dark2.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="114px" height="100px" viewBox="0 0 114 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - Black</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="100.929941%" y1="181.283245%" x2="41.7687834%" y2="100%" id="linearGradient-1">
+            <stop stop-color="#FFFFFF" offset="0%"></stop>
+            <stop stop-color="#000000" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Black-Triangle" transform="translate(-293.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---Black" points="350 150 407 250 293 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss
new file mode 100644
index 0000000000000..fdaf9c9476f9c
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss
@@ -0,0 +1,4 @@
+.red-text {
+  color: red;
+  background-image: url('./dark.svg') url(dark2.svg);
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss
new file mode 100644
index 0000000000000..37e7107172397
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss
@@ -0,0 +1,5 @@
+@import './global2b.scss';
+
+.blue-text {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss
new file mode 100644
index 0000000000000..41c015298e5fd
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss
@@ -0,0 +1,5 @@
+.blue-text {
+  color: orange;
+  font-weight: bolder;
+  background-image: url(../assets/light.svg);
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/assets/light.svg b/test/integration/scss-fixtures/url-global-asset-prefix-2/assets/light.svg
new file mode 100644
index 0000000000000..0194cbce06561
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/assets/light.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="113px" height="100px" viewBox="0 0 113 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - White</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="196.572434%" y1="228.815483%" x2="50%" y2="50%" id="linearGradient-1">
+            <stop stop-color="#000000" offset="0%"></stop>
+            <stop stop-color="#FFFFFF" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="White-Triangle" transform="translate(-294.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---White" points="350.5 150 407 250 294 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/next.config.js b/test/integration/scss-fixtures/url-global-asset-prefix-2/next.config.js
new file mode 100644
index 0000000000000..72ff6da7d9adf
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/next.config.js
@@ -0,0 +1,5 @@
+const config = require('../next.config.js')
+module.exports = {
+  ...config,
+  assetPrefix: '/foo',
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/pages/_app.js b/test/integration/scss-fixtures/url-global-asset-prefix-2/pages/_app.js
new file mode 100644
index 0000000000000..29beb9fdb3cc5
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/pages/_app.js
@@ -0,0 +1,13 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global1.scss'
+import '../styles/global2.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/pages/index.js b/test/integration/scss-fixtures/url-global-asset-prefix-2/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark.svg b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark.svg
new file mode 100644
index 0000000000000..bdae3d6587872
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="114px" height="100px" viewBox="0 0 114 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - Black</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="100.929941%" y1="181.283245%" x2="41.7687834%" y2="100%" id="linearGradient-1">
+            <stop stop-color="#FFFFFF" offset="0%"></stop>
+            <stop stop-color="#000000" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Black-Triangle" transform="translate(-293.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---Black" points="350 150 407 250 293 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark2.svg b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark2.svg
new file mode 100644
index 0000000000000..bdae3d6587872
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/dark2.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="114px" height="100px" viewBox="0 0 114 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - Black</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="100.929941%" y1="181.283245%" x2="41.7687834%" y2="100%" id="linearGradient-1">
+            <stop stop-color="#FFFFFF" offset="0%"></stop>
+            <stop stop-color="#000000" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Black-Triangle" transform="translate(-293.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---Black" points="350 150 407 250 293 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss
new file mode 100644
index 0000000000000..fdaf9c9476f9c
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss
@@ -0,0 +1,4 @@
+.red-text {
+  color: red;
+  background-image: url('./dark.svg') url(dark2.svg);
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss
new file mode 100644
index 0000000000000..37e7107172397
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss
@@ -0,0 +1,5 @@
+@import './global2b.scss';
+
+.blue-text {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss
new file mode 100644
index 0000000000000..41c015298e5fd
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss
@@ -0,0 +1,5 @@
+.blue-text {
+  color: orange;
+  font-weight: bolder;
+  background-image: url(../assets/light.svg);
+}
diff --git a/test/integration/scss-fixtures/url-global/assets/light.svg b/test/integration/scss-fixtures/url-global/assets/light.svg
new file mode 100644
index 0000000000000..0194cbce06561
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/assets/light.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="113px" height="100px" viewBox="0 0 113 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - White</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="196.572434%" y1="228.815483%" x2="50%" y2="50%" id="linearGradient-1">
+            <stop stop-color="#000000" offset="0%"></stop>
+            <stop stop-color="#FFFFFF" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="White-Triangle" transform="translate(-294.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---White" points="350.5 150 407 250 294 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global/pages/_app.js b/test/integration/scss-fixtures/url-global/pages/_app.js
new file mode 100644
index 0000000000000..29beb9fdb3cc5
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/pages/_app.js
@@ -0,0 +1,13 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global1.scss'
+import '../styles/global2.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/url-global/pages/index.js b/test/integration/scss-fixtures/url-global/pages/index.js
new file mode 100644
index 0000000000000..5cbac8a153d77
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/url-global/styles/dark.svg b/test/integration/scss-fixtures/url-global/styles/dark.svg
new file mode 100644
index 0000000000000..bdae3d6587872
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/styles/dark.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="114px" height="100px" viewBox="0 0 114 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - Black</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="100.929941%" y1="181.283245%" x2="41.7687834%" y2="100%" id="linearGradient-1">
+            <stop stop-color="#FFFFFF" offset="0%"></stop>
+            <stop stop-color="#000000" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Black-Triangle" transform="translate(-293.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---Black" points="350 150 407 250 293 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global/styles/dark2.svg b/test/integration/scss-fixtures/url-global/styles/dark2.svg
new file mode 100644
index 0000000000000..bdae3d6587872
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/styles/dark2.svg
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="114px" height="100px" viewBox="0 0 114 100" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <!-- Generator: Sketch 51.2 (57519) - http://www.bohemiancoding.com/sketch -->
+    <title>Logotype - Black</title>
+    <desc>Created with Sketch.</desc>
+    <defs>
+        <linearGradient x1="100.929941%" y1="181.283245%" x2="41.7687834%" y2="100%" id="linearGradient-1">
+            <stop stop-color="#FFFFFF" offset="0%"></stop>
+            <stop stop-color="#000000" offset="100%"></stop>
+        </linearGradient>
+    </defs>
+    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Black-Triangle" transform="translate(-293.000000, -150.000000)" fill="url(#linearGradient-1)">
+            <polygon id="Logotype---Black" points="350 150 407 250 293 250"></polygon>
+        </g>
+    </g>
+</svg>
diff --git a/test/integration/scss-fixtures/url-global/styles/global1.scss b/test/integration/scss-fixtures/url-global/styles/global1.scss
new file mode 100644
index 0000000000000..fdaf9c9476f9c
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/styles/global1.scss
@@ -0,0 +1,4 @@
+.red-text {
+  color: red;
+  background-image: url('./dark.svg') url(dark2.svg);
+}
diff --git a/test/integration/scss-fixtures/url-global/styles/global2.scss b/test/integration/scss-fixtures/url-global/styles/global2.scss
new file mode 100644
index 0000000000000..37e7107172397
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/styles/global2.scss
@@ -0,0 +1,5 @@
+@import './global2b.scss';
+
+.blue-text {
+  color: blue;
+}
diff --git a/test/integration/scss-fixtures/url-global/styles/global2b.scss b/test/integration/scss-fixtures/url-global/styles/global2b.scss
new file mode 100644
index 0000000000000..41c015298e5fd
--- /dev/null
+++ b/test/integration/scss-fixtures/url-global/styles/global2b.scss
@@ -0,0 +1,5 @@
+.blue-text {
+  color: orange;
+  font-weight: bolder;
+  background-image: url(../assets/light.svg);
+}
diff --git a/test/integration/scss-fixtures/valid-and-invalid-global/pages/_app.js b/test/integration/scss-fixtures/valid-and-invalid-global/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/valid-and-invalid-global/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/valid-and-invalid-global/pages/index.js b/test/integration/scss-fixtures/valid-and-invalid-global/pages/index.js
new file mode 100644
index 0000000000000..38d46eb2a45eb
--- /dev/null
+++ b/test/integration/scss-fixtures/valid-and-invalid-global/pages/index.js
@@ -0,0 +1,5 @@
+import '../styles/global.scss'
+
+export default function Home() {
+  return <div className="red-text">This text should be red.</div>
+}
diff --git a/test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss b/test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss
new file mode 100644
index 0000000000000..8e1524022baf8
--- /dev/null
+++ b/test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss
@@ -0,0 +1,3 @@
+.red-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/with-styled-jsx/pages/_app.js b/test/integration/scss-fixtures/with-styled-jsx/pages/_app.js
new file mode 100644
index 0000000000000..b89fe16feb731
--- /dev/null
+++ b/test/integration/scss-fixtures/with-styled-jsx/pages/_app.js
@@ -0,0 +1,12 @@
+import React from 'react'
+import App from 'next/app'
+import '../styles/global.scss'
+
+class MyApp extends App {
+  render() {
+    const { Component, pageProps } = this.props
+    return <Component {...pageProps} />
+  }
+}
+
+export default MyApp
diff --git a/test/integration/scss-fixtures/with-styled-jsx/pages/index.js b/test/integration/scss-fixtures/with-styled-jsx/pages/index.js
new file mode 100644
index 0000000000000..ed9aa0621925e
--- /dev/null
+++ b/test/integration/scss-fixtures/with-styled-jsx/pages/index.js
@@ -0,0 +1,12 @@
+export default function Home() {
+  return (
+    <>
+      <div className="my-text">This text should be green.</div>
+      <style jsx global>{`
+        .my-text {
+          color: green;
+        }
+      `}</style>
+    </>
+  )
+}
diff --git a/test/integration/scss-fixtures/with-styled-jsx/styles/global.scss b/test/integration/scss-fixtures/with-styled-jsx/styles/global.scss
new file mode 100644
index 0000000000000..167caa35ea86e
--- /dev/null
+++ b/test/integration/scss-fixtures/with-styled-jsx/styles/global.scss
@@ -0,0 +1,3 @@
+.my-text {
+  color: red;
+}
diff --git a/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/_app.js b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/_app.js
new file mode 100644
index 0000000000000..0e40312aad8ac
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/_app.js
@@ -0,0 +1,5 @@
+import '../styles/global.scss'
+
+export default function MyApp({ Component, pageProps }) {
+  return <Component {...pageProps} />
+}
diff --git a/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/index.js b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/index.js
new file mode 100644
index 0000000000000..ee6a89480a706
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/pages/index.js
@@ -0,0 +1,38 @@
+import Link from 'next/link'
+
+const links = [
+  { href: 'https://github.com/zeit/next.js', label: 'GitHub' },
+  { href: 'https://nextjs.org/docs', label: 'Docs' },
+]
+
+function Nav() {
+  return (
+    <nav>
+      <ul className="flex justify-between items-center p-8">
+        <li>
+          <Link href="/">
+            <a className="text-blue-500 no-underline">Home</a>
+          </Link>
+        </li>
+        <ul className="flex justify-between items-center">
+          {links.map(({ href, label }) => (
+            <li key={`${href}${label}`} className="ml-4">
+              <a href={href} className="btn-blue no-underline">
+                {label}
+              </a>
+            </li>
+          ))}
+        </ul>
+      </ul>
+    </nav>
+  )
+}
+
+export default () => (
+  <div>
+    <Nav />
+    <div className="hero">
+      <h1 className="title">Next.js + Tailwind CSS + PurgeCSS</h1>
+    </div>
+  </div>
+)
diff --git a/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/postcss.config.js b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/postcss.config.js
new file mode 100644
index 0000000000000..b39d3d7ff9d14
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/postcss.config.js
@@ -0,0 +1,13 @@
+const path = require('path')
+module.exports = {
+  plugins: [
+    'tailwindcss',
+    [
+      '@fullhuman/postcss-purgecss',
+      {
+        content: [path.join(__dirname, './pages/**/*.{js,jsx,ts,tsx}')],
+        defaultExtractor: content => content.match(/[A-Za-z0-9-_:/]+/g) || [],
+      },
+    ],
+  ],
+}
diff --git a/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/styles/global.scss b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/styles/global.scss
new file mode 100644
index 0000000000000..b5c61c956711f
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss-and-purgecss/styles/global.scss
@@ -0,0 +1,3 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
diff --git a/test/integration/scss-fixtures/with-tailwindcss/package.json b/test/integration/scss-fixtures/with-tailwindcss/package.json
new file mode 100644
index 0000000000000..50375a78eb20b
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss/package.json
@@ -0,0 +1,7 @@
+{
+  "postcss": {
+    "plugins": {
+      "tailwindcss": {}
+    }
+  }
+}
diff --git a/test/integration/scss-fixtures/with-tailwindcss/pages/_app.js b/test/integration/scss-fixtures/with-tailwindcss/pages/_app.js
new file mode 100644
index 0000000000000..0e40312aad8ac
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss/pages/_app.js
@@ -0,0 +1,5 @@
+import '../styles/global.scss'
+
+export default function MyApp({ Component, pageProps }) {
+  return <Component {...pageProps} />
+}
diff --git a/test/integration/scss-fixtures/with-tailwindcss/pages/index.js b/test/integration/scss-fixtures/with-tailwindcss/pages/index.js
new file mode 100644
index 0000000000000..b3ba78da2d5e1
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss/pages/index.js
@@ -0,0 +1,3 @@
+export default function Home() {
+  return <div />
+}
diff --git a/test/integration/scss-fixtures/with-tailwindcss/styles/global.scss b/test/integration/scss-fixtures/with-tailwindcss/styles/global.scss
new file mode 100644
index 0000000000000..b5c61c956711f
--- /dev/null
+++ b/test/integration/scss-fixtures/with-tailwindcss/styles/global.scss
@@ -0,0 +1,3 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
diff --git a/test/integration/scss/test/index.test.js b/test/integration/scss/test/index.test.js
new file mode 100644
index 0000000000000..59c698114427c
--- /dev/null
+++ b/test/integration/scss/test/index.test.js
@@ -0,0 +1,815 @@
+/* eslint-env jest */
+/* global jasmine */
+import 'flat-map-polyfill'
+import { join } from 'path'
+import { readdir, readFile, remove } from 'fs-extra'
+import {
+  findPort,
+  nextBuild,
+  nextStart,
+  launchApp,
+  killApp,
+  File,
+  waitFor,
+  renderViaHTTP,
+} from 'next-test-utils'
+import webdriver from 'next-webdriver'
+import cheerio from 'cheerio'
+
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 2
+
+const fixturesDir = join(__dirname, '../..', 'scss-fixtures')
+
+describe('SCSS Support', () => {
+  describe('Basic Global Support', () => {
+    const appDir = join(fixturesDir, 'single-global')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      expect(await readFile(join(cssFolder, cssFiles[0]), 'utf8')).toContain(
+        'color:red'
+      )
+    })
+  })
+
+  describe('Basic Global Support with src/ dir', () => {
+    const appDir = join(fixturesDir, 'single-global-src')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      expect(await readFile(join(cssFolder, cssFiles[0]), 'utf8')).toContain(
+        'color:red'
+      )
+    })
+  })
+
+  describe('Multi Global Support', () => {
+    const appDir = join(fixturesDir, 'multi-global')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(`".red-text{color:red}.blue-text{color:#00f}"`)
+    })
+  })
+
+  describe('Nested @import() Global Support', () => {
+    const appDir = join(fixturesDir, 'nested-global')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(
+        `".red-text{color:purple;font-weight:bolder;color:red}.blue-text{color:orange;font-weight:bolder;color:#00f}"`
+      )
+    })
+  })
+
+  describe('CSS Compilation and Prefixing', () => {
+    const appDir = join(fixturesDir, 'compilation-and-prefixing')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've compiled and prefixed`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(
+        `"@media (min-width:480px) and (max-width:767px){::-webkit-input-placeholder{color:green}::-moz-placeholder{color:green}:-ms-input-placeholder{color:green}::-ms-input-placeholder{color:green}::placeholder{color:green}}"`
+      )
+
+      // Contains a source map
+      expect(cssContent).toMatch(/\/\*#\s*sourceMappingURL=(.+\.map)\s*\*\//)
+    })
+
+    it(`should've emitted a source map`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssMapFiles = files.filter(f => /\.css\.map$/.test(f))
+
+      expect(cssMapFiles.length).toBe(1)
+      const cssMapContent = (
+        await readFile(join(cssFolder, cssMapFiles[0]), 'utf8')
+      ).trim()
+
+      const { version, mappings, sourcesContent } = JSON.parse(cssMapContent)
+      expect({ version, mappings, sourcesContent }).toMatchInlineSnapshot(`
+        Object {
+          "mappings": "AAAA,+CACE,4BACE,WACF,CAFA,mBACE,WACF,CAFA,uBACE,WACF,CAFA,wBACE,WACF,CAFA,cACE,WACF,CACF",
+          "sourcesContent": Array [
+            "@media (480px <= width < 768px) {
+          ::placeholder {
+            color: green;
+          }
+        }
+        ",
+          ],
+          "version": 3,
+        }
+      `)
+    })
+  })
+
+  // Tests css ordering
+  describe('Multi Global Support (reversed)', () => {
+    const appDir = join(fixturesDir, 'multi-global-reversed')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(`".blue-text{color:#00f}.red-text{color:red}"`)
+    })
+  })
+
+  describe('Invalid CSS in _document', () => {
+    const appDir = join(fixturesDir, 'invalid-module-document')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should fail to build', async () => {
+      const { stderr } = await nextBuild(appDir, [], {
+        stderr: true,
+      })
+      expect(stderr).toContain('Failed to compile')
+      expect(stderr).toContain('styles.module.css')
+      expect(stderr).toMatch(
+        /CSS.*cannot.*be imported within.*pages[\\/]_document\.js/
+      )
+      expect(stderr).toMatch(/Location:.*pages[\\/]_document\.js/)
+    })
+  })
+
+  describe('Invalid Global CSS', () => {
+    const appDir = join(fixturesDir, 'invalid-global')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should fail to build', async () => {
+      const { stderr } = await nextBuild(appDir, [], {
+        stderr: true,
+      })
+      expect(stderr).toContain('Failed to compile')
+      expect(stderr).toContain('styles/global.css')
+      expect(stderr).toMatch(
+        /Please move all global CSS imports.*?pages(\/|\\)_app/
+      )
+      expect(stderr).toMatch(/Location:.*pages[\\/]index\.js/)
+    })
+  })
+
+  describe('Invalid Global CSS with Custom App', () => {
+    const appDir = join(fixturesDir, 'invalid-global-with-app')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should fail to build', async () => {
+      const { stderr } = await nextBuild(appDir, [], {
+        stderr: true,
+      })
+      expect(stderr).toContain('Failed to compile')
+      expect(stderr).toContain('styles/global.css')
+      expect(stderr).toMatch(
+        /Please move all global CSS imports.*?pages(\/|\\)_app/
+      )
+      expect(stderr).toMatch(/Location:.*pages[\\/]index\.js/)
+    })
+  })
+
+  describe('Valid and Invalid Global CSS with Custom App', () => {
+    const appDir = join(fixturesDir, 'valid-and-invalid-global')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should fail to build', async () => {
+      const { stderr } = await nextBuild(appDir, [], {
+        stderr: true,
+      })
+      expect(stderr).toContain('Failed to compile')
+      expect(stderr).toContain('styles/global.css')
+      expect(stderr).toContain('Please move all global CSS imports')
+      expect(stderr).toMatch(/Location:.*pages[\\/]index\.js/)
+    })
+  })
+
+  describe('Can hot reload CSS without losing state', () => {
+    const appDir = join(fixturesDir, 'multi-page')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should update CSS color without remounting <input>', async () => {
+      let browser
+      try {
+        browser = await webdriver(appPort, '/page1')
+        await waitFor(2000) // ensure application hydrates
+
+        const desiredText = 'hello world'
+        await browser.elementById('text-input').type(desiredText)
+        expect(await browser.elementById('text-input').getValue()).toBe(
+          desiredText
+        )
+
+        const currentColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('.red-text')).color`
+        )
+        expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
+
+        const cssFile = new File(join(appDir, 'styles/global1.css'))
+        try {
+          cssFile.replace('color: red', 'color: purple')
+          await waitFor(2000) // wait for HMR
+
+          const refreshedColor = await browser.eval(
+            `window.getComputedStyle(document.querySelector('.red-text')).color`
+          )
+          expect(refreshedColor).toMatchInlineSnapshot(`"rgb(128, 0, 128)"`)
+
+          // ensure text remained
+          expect(await browser.elementById('text-input').getValue()).toBe(
+            desiredText
+          )
+        } finally {
+          cssFile.restore()
+        }
+      } finally {
+        if (browser) {
+          await browser.close()
+        }
+      }
+    })
+  })
+
+  describe('Has CSS in computed styles in Development', () => {
+    const appDir = join(fixturesDir, 'multi-page')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have CSS for page', async () => {
+      let browser
+      try {
+        browser = await webdriver(appPort, '/page2')
+
+        const currentColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('.blue-text')).color`
+        )
+        expect(currentColor).toMatchInlineSnapshot(`"rgb(0, 0, 255)"`)
+      } finally {
+        if (browser) {
+          await browser.close()
+        }
+      }
+    })
+  })
+
+  describe('Body is not hidden when unused in Development', () => {
+    const appDir = join(fixturesDir, 'unused')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have body visible', async () => {
+      let browser
+      try {
+        browser = await webdriver(appPort, '/')
+        const currentDisplay = await browser.eval(
+          `window.getComputedStyle(document.querySelector('body')).display`
+        )
+        expect(currentDisplay).toBe('block')
+      } finally {
+        if (browser) {
+          await browser.close()
+        }
+      }
+    })
+  })
+
+  describe('Body is not hidden when broken in Development', () => {
+    const appDir = join(fixturesDir, 'unused')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have body visible', async () => {
+      const pageFile = new File(join(appDir, 'pages/index.js'))
+      let browser
+      try {
+        pageFile.replace('<div />', '<div>')
+        await waitFor(2000) // wait for recompile
+
+        browser = await webdriver(appPort, '/')
+        const currentDisplay = await browser.eval(
+          `window.getComputedStyle(document.querySelector('body')).display`
+        )
+        expect(currentDisplay).toBe('block')
+      } finally {
+        pageFile.restore()
+        if (browser) {
+          await browser.close()
+        }
+      }
+    })
+  })
+
+  describe('Has CSS in computed styles in Production', () => {
+    const appDir = join(fixturesDir, 'multi-page')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have CSS for page', async () => {
+      const browser = await webdriver(appPort, '/page2')
+
+      const currentColor = await browser.eval(
+        `window.getComputedStyle(document.querySelector('.blue-text')).color`
+      )
+      expect(currentColor).toMatchInlineSnapshot(`"rgb(0, 0, 255)"`)
+    })
+
+    it(`should've preloaded the CSS file and injected it in <head>`, async () => {
+      const content = await renderViaHTTP(appPort, '/page2')
+      const $ = cheerio.load(content)
+
+      const cssPreload = $('link[rel="preload"][as="style"]')
+      expect(cssPreload.length).toBe(1)
+      expect(cssPreload.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+
+      const cssSheet = $('link[rel="stylesheet"]')
+      expect(cssSheet.length).toBe(1)
+      expect(cssSheet.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+
+      /* ensure CSS preloaded first */
+      const allPreloads = [].slice.call($('link[rel="preload"]'))
+      const styleIndexes = allPreloads.flatMap((p, i) =>
+        p.attribs.as === 'style' ? i : []
+      )
+      expect(styleIndexes).toEqual([0])
+    })
+  })
+
+  describe('CSS URL via `file-loader`', () => {
+    const appDir = join(fixturesDir, 'url-global')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted expected files`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+      const mediaFolder = join(appDir, '.next/static/media')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatch(
+        /^\.red-text\{color:red;background-image:url\(\/_next\/static\/media\/dark\.[a-z0-9]{32}\.svg\) url\(\/_next\/static\/media\/dark2\.[a-z0-9]{32}\.svg\)\}\.blue-text\{color:orange;font-weight:bolder;background-image:url\(\/_next\/static\/media\/light\.[a-z0-9]{32}\.svg\);color:#00f\}$/
+      )
+
+      const mediaFiles = await readdir(mediaFolder)
+      expect(mediaFiles.length).toBe(3)
+      expect(
+        mediaFiles
+          .map(fileName =>
+            /^(.+?)\..{32}\.(.+?)$/
+              .exec(fileName)
+              .slice(1)
+              .join('.')
+          )
+          .sort()
+      ).toMatchInlineSnapshot(`
+        Array [
+          "dark.svg",
+          "dark2.svg",
+          "light.svg",
+        ]
+      `)
+    })
+  })
+
+  describe('CSS URL via `file-loader` and asset prefix (1)', () => {
+    const appDir = join(fixturesDir, 'url-global-asset-prefix-1')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted expected files`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+      const mediaFolder = join(appDir, '.next/static/media')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatch(
+        /^\.red-text\{color:red;background-image:url\(\/foo\/_next\/static\/media\/dark\.[a-z0-9]{32}\.svg\) url\(\/foo\/_next\/static\/media\/dark2\.[a-z0-9]{32}\.svg\)\}\.blue-text\{color:orange;font-weight:bolder;background-image:url\(\/foo\/_next\/static\/media\/light\.[a-z0-9]{32}\.svg\);color:#00f\}$/
+      )
+
+      const mediaFiles = await readdir(mediaFolder)
+      expect(mediaFiles.length).toBe(3)
+      expect(
+        mediaFiles
+          .map(fileName =>
+            /^(.+?)\..{32}\.(.+?)$/
+              .exec(fileName)
+              .slice(1)
+              .join('.')
+          )
+          .sort()
+      ).toMatchInlineSnapshot(`
+        Array [
+          "dark.svg",
+          "dark2.svg",
+          "light.svg",
+        ]
+      `)
+    })
+  })
+
+  describe('CSS URL via `file-loader` and asset prefix (2)', () => {
+    const appDir = join(fixturesDir, 'url-global-asset-prefix-2')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted expected files`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+      const mediaFolder = join(appDir, '.next/static/media')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatch(
+        /^\.red-text\{color:red;background-image:url\(\/foo\/_next\/static\/media\/dark\.[a-z0-9]{32}\.svg\) url\(\/foo\/_next\/static\/media\/dark2\.[a-z0-9]{32}\.svg\)\}\.blue-text\{color:orange;font-weight:bolder;background-image:url\(\/foo\/_next\/static\/media\/light\.[a-z0-9]{32}\.svg\);color:#00f\}$/
+      )
+
+      const mediaFiles = await readdir(mediaFolder)
+      expect(mediaFiles.length).toBe(3)
+      expect(
+        mediaFiles
+          .map(fileName =>
+            /^(.+?)\..{32}\.(.+?)$/
+              .exec(fileName)
+              .slice(1)
+              .join('.')
+          )
+          .sort()
+      ).toMatchInlineSnapshot(`
+        Array [
+          "dark.svg",
+          "dark2.svg",
+          "light.svg",
+        ]
+      `)
+    })
+  })
+
+  describe('Good CSS Import from node_modules', () => {
+    const appDir = join(fixturesDir, 'npm-import')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatch(/nprogress/)
+    })
+  })
+
+  describe('Good Nested CSS Import from node_modules', () => {
+    const appDir = join(fixturesDir, 'npm-import-nested')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(`".other{color:#00f}.test{color:red}"`)
+    })
+  })
+
+  describe('Bad CSS Import from node_modules', () => {
+    const appDir = join(fixturesDir, 'npm-import-bad')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should fail the build', async () => {
+      const { stderr } = await nextBuild(appDir, [], { stderr: true })
+
+      expect(stderr).toMatch(/Can't resolve '[^']*?nprogress[^']*?'/)
+      expect(stderr).toMatch(/Build error occurred/)
+    })
+  })
+
+  describe('Ordering with styled-jsx (dev)', () => {
+    const appDir = join(fixturesDir, 'with-styled-jsx')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have the correct color (css ordering)', async () => {
+      const browser = await webdriver(appPort, '/')
+      await waitFor(2000) // ensure application hydrates
+
+      const currentColor = await browser.eval(
+        `window.getComputedStyle(document.querySelector('.my-text')).color`
+      )
+      expect(currentColor).toMatchInlineSnapshot(`"rgb(0, 128, 0)"`)
+    })
+  })
+
+  describe('Ordering with styled-jsx (prod)', () => {
+    const appDir = join(fixturesDir, 'with-styled-jsx')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have the correct color (css ordering)', async () => {
+      const browser = await webdriver(appPort, '/')
+      await waitFor(2000) // ensure application hydrates
+
+      const currentColor = await browser.eval(
+        `window.getComputedStyle(document.querySelector('.my-text')).color`
+      )
+      expect(currentColor).toMatchInlineSnapshot(`"rgb(0, 128, 0)"`)
+    })
+  })
+
+  describe('Basic Tailwind CSS', () => {
+    const appDir = join(fixturesDir, 'with-tailwindcss')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've compiled and prefixed`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(cssContent).toMatch(/object-right-bottom/) // look for tailwind's CSS
+      expect(cssContent).not.toMatch(/tailwind/) // ensure @tailwind was removed
+
+      // Contains a source map
+      expect(cssContent).toMatch(/\/\*#\s*sourceMappingURL=(.+\.map)\s*\*\//)
+    })
+
+    it(`should've emitted a source map`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssMapFiles = files.filter(f => /\.css\.map$/.test(f))
+
+      expect(cssMapFiles.length).toBe(1)
+    })
+  })
+
+  describe('Tailwind and Purge CSS', () => {
+    const appDir = join(fixturesDir, 'with-tailwindcss-and-purgecss')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should build successfully', async () => {
+      await nextBuild(appDir)
+    })
+
+    it(`should've compiled and prefixed`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(cssContent).not.toMatch(/object-right-bottom/) // this was unused and should be gone
+      expect(cssContent).toMatch(/text-blue-500/) // this was used
+      expect(cssContent).not.toMatch(/tailwind/) // ensure @tailwind was removed
+
+      // Contains a source map
+      expect(cssContent).toMatch(/\/\*#\s*sourceMappingURL=(.+\.map)\s*\*\//)
+    })
+
+    it(`should've emitted a source map`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssMapFiles = files.filter(f => /\.css\.map$/.test(f))
+
+      expect(cssMapFiles.length).toBe(1)
+    })
+  })
+})
diff --git a/yarn.lock b/yarn.lock
index dd3fd79329695..bc8d6031f55ee 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4433,6 +4433,15 @@ clone-deep@^0.3.0:
     kind-of "^3.2.2"
     shallow-clone "^0.1.2"
 
+clone-deep@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/clone-deep/-/clone-deep-4.0.1.tgz#c19fd9bdbbf85942b4fd979c84dcf7d5f07c2387"
+  integrity sha512-neHB9xuzh/wk0dIHweyAXv2aPGZIVk3pLMe+/RNzINf17fe0OG96QroktYAUm7SM1PBnzTabaLboqqxDyMU+SQ==
+  dependencies:
+    is-plain-object "^2.0.4"
+    kind-of "^6.0.2"
+    shallow-clone "^3.0.0"
+
 clone-response@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/clone-response/-/clone-response-1.0.2.tgz#d1dc973920314df67fbeb94223b4ee350239e96b"
@@ -13252,6 +13261,17 @@ sass-loader@6.0.6:
     lodash.tail "^4.1.1"
     pify "^3.0.0"
 
+sass-loader@8.0.2:
+  version "8.0.2"
+  resolved "https://registry.yarnpkg.com/sass-loader/-/sass-loader-8.0.2.tgz#debecd8c3ce243c76454f2e8290482150380090d"
+  integrity sha512-7o4dbSK8/Ol2KflEmSco4jTjQoV988bM82P9CZdmo9hR3RLnvNc0ufMNdMrB0caq38JQ/FgF4/7RcbcfKzxoFQ==
+  dependencies:
+    clone-deep "^4.0.1"
+    loader-utils "^1.2.3"
+    neo-async "^2.6.1"
+    schema-utils "^2.6.1"
+    semver "^6.3.0"
+
 sax@>=0.6.0, sax@^1.2.4, sax@~1.2.4:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
@@ -13282,6 +13302,14 @@ schema-utils@^2.0.0, schema-utils@^2.0.1, schema-utils@^2.6.0:
     ajv "^6.10.2"
     ajv-keywords "^3.4.1"
 
+schema-utils@^2.6.1:
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-2.6.4.tgz#a27efbf6e4e78689d91872ee3ccfa57d7bdd0f53"
+  integrity sha512-VNjcaUxVnEeun6B2fiiUDjXXBtD4ZSH7pdbfIu1pOFwgptDPLMo/z9jr4sUfsjFVPqDCEin/F7IYlq7/E6yDbQ==
+  dependencies:
+    ajv "^6.10.2"
+    ajv-keywords "^3.4.1"
+
 scss-tokenizer@^0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/scss-tokenizer/-/scss-tokenizer-0.2.3.tgz#8eb06db9a9723333824d3f5530641149847ce5d1"
@@ -13439,6 +13467,13 @@ shallow-clone@^0.1.2:
     lazy-cache "^0.2.3"
     mixin-object "^2.0.1"
 
+shallow-clone@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/shallow-clone/-/shallow-clone-3.0.1.tgz#8f2981ad92531f55035b01fb230769a40e02efa3"
+  integrity sha512-/6KqX+GVUdqPuPPd2LxDDxzX6CAbjJehAAOKlNpqqUpAqPM6HeL8f+o3a+JsyGjn2lv0WY8UsTgUJjU9Ok55NA==
+  dependencies:
+    kind-of "^6.0.2"
+
 shebang-command@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"

From 6877b9945395dda4e1bbb1597841043abe4f2af7 Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Sun, 19 Jan 2020 12:53:33 +0100
Subject: [PATCH 03/34] Fix failing tests

---
 test/integration/scss/test/index.test.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/test/integration/scss/test/index.test.js b/test/integration/scss/test/index.test.js
index 59c698114427c..cf6ef28ce989f 100644
--- a/test/integration/scss/test/index.test.js
+++ b/test/integration/scss/test/index.test.js
@@ -217,7 +217,7 @@ describe('SCSS Support', () => {
         stderr: true,
       })
       expect(stderr).toContain('Failed to compile')
-      expect(stderr).toContain('styles.module.css')
+      expect(stderr).toContain('styles.module.scss')
       expect(stderr).toMatch(
         /CSS.*cannot.*be imported within.*pages[\\/]_document\.js/
       )
@@ -237,7 +237,7 @@ describe('SCSS Support', () => {
         stderr: true,
       })
       expect(stderr).toContain('Failed to compile')
-      expect(stderr).toContain('styles/global.css')
+      expect(stderr).toContain('styles/global.scss')
       expect(stderr).toMatch(
         /Please move all global CSS imports.*?pages(\/|\\)_app/
       )
@@ -257,7 +257,7 @@ describe('SCSS Support', () => {
         stderr: true,
       })
       expect(stderr).toContain('Failed to compile')
-      expect(stderr).toContain('styles/global.css')
+      expect(stderr).toContain('styles/global.scss')
       expect(stderr).toMatch(
         /Please move all global CSS imports.*?pages(\/|\\)_app/
       )
@@ -277,7 +277,7 @@ describe('SCSS Support', () => {
         stderr: true,
       })
       expect(stderr).toContain('Failed to compile')
-      expect(stderr).toContain('styles/global.css')
+      expect(stderr).toContain('styles/global.scss')
       expect(stderr).toContain('Please move all global CSS imports')
       expect(stderr).toMatch(/Location:.*pages[\\/]index\.js/)
     })
@@ -317,7 +317,7 @@ describe('SCSS Support', () => {
         )
         expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
 
-        const cssFile = new File(join(appDir, 'styles/global1.css'))
+        const cssFile = new File(join(appDir, 'styles/global1.scss'))
         try {
           cssFile.replace('color: red', 'color: purple')
           await waitFor(2000) // wait for HMR

From 7302fed0047cc1d3d441fccef5dcc9708675370b Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Sun, 19 Jan 2020 13:09:30 +0100
Subject: [PATCH 04/34] Fix url-loader tests

---
 packages/next/build/webpack/config/blocks/css/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index 8f050419cc704..72d55ca12cce2 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -427,7 +427,7 @@ export const css = curry(async function css(
         oneOf: [
           {
             // This should only be applied to CSS files
-            issuer: { test: /\.css$/ },
+            issuer: { test: /\.(css|scss|sass)$/ },
             // Exclude extensions that webpack handles by default
             exclude: [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
             use: {

From 11ce9033d12ce23a375f3f31f8f79712917f138e Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Sun, 19 Jan 2020 13:14:28 +0100
Subject: [PATCH 05/34] Remove css file generated by tests

---
 test/integration/scss-fixtures/multi-page/styles/global1.css | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 test/integration/scss-fixtures/multi-page/styles/global1.css

diff --git a/test/integration/scss-fixtures/multi-page/styles/global1.css b/test/integration/scss-fixtures/multi-page/styles/global1.css
deleted file mode 100644
index ec747fa47ddb8..0000000000000
--- a/test/integration/scss-fixtures/multi-page/styles/global1.css
+++ /dev/null
@@ -1 +0,0 @@
-null
\ No newline at end of file

From 952aba6d98978055ef315b3aeb1f083787d5604d Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Sun, 19 Jan 2020 16:05:10 +0100
Subject: [PATCH 06/34] Fix nprogress import for css file

---
 test/integration/scss-fixtures/npm-import/styles/global.scss | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/integration/scss-fixtures/npm-import/styles/global.scss b/test/integration/scss-fixtures/npm-import/styles/global.scss
index a3bfbdf7d6700..a369dafd92cc4 100644
--- a/test/integration/scss-fixtures/npm-import/styles/global.scss
+++ b/test/integration/scss-fixtures/npm-import/styles/global.scss
@@ -1 +1 @@
-@import '~nprogress/nprogress.scss';
+@import '~nprogress/nprogress.css';

From cd23277fd9ae3a3a455a27d7942bdecd26ca8707 Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Sun, 19 Jan 2020 16:44:34 +0100
Subject: [PATCH 07/34] Fix SCSS modules (still 2 tests that need
 investigating)

---
 .../blocks/css/getCssModuleLocalIdent.ts      |   8 +-
 .../scss-modules/test/index.test.js           | 400 ++++++++++++++++++
 2 files changed, 406 insertions(+), 2 deletions(-)
 create mode 100644 test/integration/scss-modules/test/index.test.js

diff --git a/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts b/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts
index e85e9f93957c1..e2a91edd1050c 100644
--- a/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts
+++ b/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts
@@ -15,8 +15,12 @@ export function getCssModuleLocalIdent(
   // Generate a more meaningful name (parent folder) when the user names the
   // file `index.module.css`.
   const fileNameOrFolder =
-    relativePath.endsWith('index.module.css') &&
-    relativePath !== 'pages/index.module.css'
+    (relativePath.endsWith('index.module.css') ||
+      relativePath.endsWith('index.module.scss') ||
+      relativePath.endsWith('index.module.sass')) &&
+    relativePath !== 'pages/index.module.css' &&
+      relativePath !== 'pages/index.module.scss' &&
+      relativePath !== 'pages/index.module.sass'
       ? '[folder]'
       : '[name]'
 
diff --git a/test/integration/scss-modules/test/index.test.js b/test/integration/scss-modules/test/index.test.js
new file mode 100644
index 0000000000000..242d4eb38762e
--- /dev/null
+++ b/test/integration/scss-modules/test/index.test.js
@@ -0,0 +1,400 @@
+/* eslint-env jest */
+/* global jasmine */
+import { join } from 'path'
+import { remove, readFile, readdir } from 'fs-extra'
+import {
+  nextBuild,
+  nextStart,
+  findPort,
+  killApp,
+  launchApp,
+  waitFor,
+  renderViaHTTP,
+} from 'next-test-utils'
+import cheerio from 'cheerio'
+import webdriver from 'next-webdriver'
+
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 1
+
+const fixturesDir = join(__dirname, '../../scss-fixtures')
+
+describe('SCSS modules', () => {
+  describe('Basic CSS Module Support', () => {
+    const appDir = join(fixturesDir, 'basic-module')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(`".index_redText__2VIiM{color:red}"`)
+    })
+
+    it(`should've injected the CSS on server render`, async () => {
+      const content = await renderViaHTTP(appPort, '/')
+      const $ = cheerio.load(content)
+
+      const cssPreload = $('link[rel="preload"][as="style"]')
+      expect(cssPreload.length).toBe(1)
+      expect(cssPreload.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+
+      const cssSheet = $('link[rel="stylesheet"]')
+      expect(cssSheet.length).toBe(1)
+      expect(cssSheet.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+
+      expect($('#verify-red').attr('class')).toMatchInlineSnapshot(
+        `"index_redText__2VIiM"`
+      )
+    })
+  })
+
+  describe('3rd Party CSS Module Support', () => {
+    const appDir = join(fixturesDir, '3rd-party-module')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(
+        `".index_foo__9_fxH{position:relative}.index_foo__9_fxH .bar,.index_foo__9_fxH .baz{height:100%;overflow:hidden}.index_foo__9_fxH .lol,.index_foo__9_fxH>.lel{width:80%}"`
+      )
+    })
+
+    it(`should've injected the CSS on server render`, async () => {
+      const content = await renderViaHTTP(appPort, '/')
+      const $ = cheerio.load(content)
+
+      const cssPreload = $('link[rel="preload"][as="style"]')
+      expect(cssPreload.length).toBe(1)
+      expect(cssPreload.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+
+      const cssSheet = $('link[rel="stylesheet"]')
+      expect(cssSheet.length).toBe(1)
+      expect(cssSheet.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+
+      expect($('#verify-div').attr('class')).toMatchInlineSnapshot(
+        `"index_foo__9_fxH"`
+      )
+    })
+  })
+
+  describe('Has CSS Module in computed styles in Development', () => {
+    const appDir = join(fixturesDir, 'dev-module')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have CSS for page', async () => {
+      const browser = await webdriver(appPort, '/')
+
+      const currentColor = await browser.eval(
+        `window.getComputedStyle(document.querySelector('#verify-red')).color`
+      )
+      expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
+    })
+  })
+
+  describe('Has CSS Module in computed styles in Production', () => {
+    const appDir = join(fixturesDir, 'prod-module')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it('should have CSS for page', async () => {
+      const browser = await webdriver(appPort, '/')
+
+      const currentColor = await browser.eval(
+        `window.getComputedStyle(document.querySelector('#verify-red')).color`
+      )
+      expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
+    })
+  })
+
+  xdescribe('Can hot reload CSS Module without losing state', () => {
+    const appDir = join(fixturesDir, 'hmr-module')
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    // FIXME: this is broken
+    it('should update CSS color without remounting <input>', async () => {
+      const browser = await webdriver(appPort, '/')
+      await waitFor(2000) // ensure application hydrates
+
+      const desiredText = 'hello world'
+      await browser.elementById('text-input').type(desiredText)
+      expect(await browser.elementById('text-input').getValue()).toBe(
+        desiredText
+      )
+
+      const currentColor = await browser.eval(
+        `window.getComputedStyle(document.querySelector('#verify-red')).color`
+      )
+      expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
+
+      const cssFile = new File(join(appDir, 'pages/index.module.scss'))
+      try {
+        cssFile.replace('color: red', 'color: purple')
+        await waitFor(2000) // wait for HMR
+
+        const refreshedColor = await browser.eval(
+          `window.getComputedStyle(document.querySelector('#verify-red')).color`
+        )
+        expect(refreshedColor).toMatchInlineSnapshot(`"rgb(128, 0, 128)"`)
+
+        // ensure text remained
+        expect(await browser.elementById('text-input').getValue()).toBe(
+          desiredText
+        )
+      } finally {
+        cssFile.restore()
+      }
+    })
+  })
+
+  describe('Invalid CSS Module Usage in node_modules', () => {
+    const appDir = join(fixturesDir, 'invalid-module')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should fail to build', async () => {
+      const { stderr } = await nextBuild(appDir, [], {
+        stderr: true,
+      })
+      expect(stderr).toContain('Failed to compile')
+      expect(stderr).toContain('node_modules/example/index.module.scss')
+      expect(stderr).toMatch(
+        /CSS Modules.*cannot.*be imported from within.*node_modules/
+      )
+      expect(stderr).toMatch(
+        /Location:.*node_modules[\\/]example[\\/]index\.mjs/
+      )
+    })
+  })
+
+  describe('Invalid CSS Module Usage in node_modules', () => {
+    const appDir = join(fixturesDir, 'invalid-global-module')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    it('should fail to build', async () => {
+      const { stderr } = await nextBuild(appDir, [], {
+        stderr: true,
+      })
+      expect(stderr).toContain('Failed to compile')
+      expect(stderr).toContain('node_modules/example/index.scss')
+      expect(stderr).toMatch(
+        /Global CSS.*cannot.*be imported from within.*node_modules/
+      )
+      expect(stderr).toMatch(
+        /Location:.*node_modules[\\/]example[\\/]index\.mjs/
+      )
+    })
+  })
+
+  describe('Valid CSS Module Usage from within node_modules', () => {
+    const appDir = join(fixturesDir, 'nm-module')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it(`should've prerendered with relevant data`, async () => {
+      const content = await renderViaHTTP(appPort, '/')
+      const $ = cheerio.load(content)
+
+      const cssPreload = $('#nm-div')
+      expect(cssPreload.text()).toMatchInlineSnapshot(
+        `"{\\"message\\":\\"Why hello there\\"} {\\"redText\\":\\"example_redText__1hNNA\\"}"`
+      )
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(`".example_redText__1hNNA{color:\\"red\\"}"`)
+    })
+  })
+
+  describe('Valid Nested CSS Module Usage from within node_modules', () => {
+    const appDir = join(fixturesDir, 'nm-module-nested')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+    })
+
+    let appPort
+    let app
+    beforeAll(async () => {
+      await nextBuild(appDir)
+      appPort = await findPort()
+      app = await nextStart(appDir, appPort)
+    })
+    afterAll(async () => {
+      await killApp(app)
+    })
+
+    it(`should've prerendered with relevant data`, async () => {
+      const content = await renderViaHTTP(appPort, '/')
+      const $ = cheerio.load(content)
+
+      const cssPreload = $('#nm-div')
+      expect(cssPreload.text()).toMatchInlineSnapshot(
+        `"{\\"message\\":\\"Why hello there\\"} {\\"subClass\\":\\"example_subClass__2YUgj other_className__bt_-E\\"}"`
+      )
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(
+        `".other3_other3__1f9h7{color:violet}.other_className__bt_-E{background:red;color:#ff0}.other2_other2__2PUfY{color:red}.example_subClass__2YUgj{background:#00f}"`
+      )
+    })
+  })
+
+  describe('CSS Module Composes Usage (Basic)', () => {
+    // This is a very bad feature. Do not use it.
+    const appDir = join(fixturesDir, 'composes-basic')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(
+        `".index_className__2O8Wt{background:red;color:#ff0}.index_subClass__3e6Re{background:#00f}"`
+      )
+    })
+  })
+
+  describe('CSS Module Composes Usage (External)', () => {
+    // This is a very bad feature. Do not use it.
+    const appDir = join(fixturesDir, 'composes-external')
+
+    beforeAll(async () => {
+      await remove(join(appDir, '.next'))
+      await nextBuild(appDir)
+    })
+
+    it(`should've emitted a single CSS file`, async () => {
+      const cssFolder = join(appDir, '.next/static/css')
+
+      const files = await readdir(cssFolder)
+      const cssFiles = files.filter(f => /\.css$/.test(f))
+
+      expect(cssFiles.length).toBe(1)
+      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+
+      expect(
+        cssContent.replace(/\/\*.*?\*\//g, '').trim()
+      ).toMatchInlineSnapshot(
+        `".other_className__2VTl4{background:red;color:#ff0}.index_subClass__3e6Re{background:#00f}"`
+      )
+    })
+  })
+})

From 81a6a800afd95f83befdbab5f7c55a56d6fd3681 Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Sun, 19 Jan 2020 11:20:09 -0700
Subject: [PATCH 08/34] Update documentation for Sass support

---
 docs/basic-features/built-in-css-support.md | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/docs/basic-features/built-in-css-support.md b/docs/basic-features/built-in-css-support.md
index 1bc6a1274659c..4b8f562df384a 100644
--- a/docs/basic-features/built-in-css-support.md
+++ b/docs/basic-features/built-in-css-support.md
@@ -157,10 +157,19 @@ export default HelloWorld
 
 Please see the [styled-jsx documentation](https://github.com/zeit/styled-jsx) for more examples.
 
-## Sass, Less, and Stylus Support
+## Sass Support
 
-To support importing `.scss`, `.less` or `.styl` files you can use the following plugins:
+To enable importing global `.scss` or `.sass` within `pages/_app.js` and component-level CSS Modules with `.module.scss` or `.module.sass` install `node-sass` as a dependency to your project:
+
+```bash
+npm install node-sass
+```
+
+Sass support has the same benefits and restrictions as the built-in CSS support detailed above.
+
+## Less and Stylus Support
+
+To support importing `.less` or `.styl` files you can use the following plugins:
 
-- [@zeit/next-sass](https://github.com/zeit/next-plugins/tree/master/packages/next-sass)
 - [@zeit/next-less](https://github.com/zeit/next-plugins/tree/master/packages/next-less)
 - [@zeit/next-stylus](https://github.com/zeit/next-plugins/tree/master/packages/next-stylus)

From 380319d9d0c4bfb19e28c210262ccd82d19f3556 Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Sun, 19 Jan 2020 16:27:47 -0700
Subject: [PATCH 09/34] Fix plain CSS import test

---
 .../nm-module-nested/node_modules/example/index.module.scss   | 2 +-
 .../nm-module-nested/node_modules/example/other.scss          | 2 +-
 .../node_modules/example/{other2.scss => other2.css}          | 0
 .../node_modules/example/{other3.scss => other3.css}          | 0
 test/integration/scss-modules/test/index.test.js              | 4 ++--
 5 files changed, 4 insertions(+), 4 deletions(-)
 rename test/integration/scss-fixtures/nm-module-nested/node_modules/example/{other2.scss => other2.css} (100%)
 rename test/integration/scss-fixtures/nm-module-nested/node_modules/example/{other3.scss => other3.css} (100%)

diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
index aed5852ba6873..095246f28de48 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
@@ -1,4 +1,4 @@
-@import 'other2.scss';
+@import 'other2.css';
 
 .subClass {
   composes: className from './other.scss';
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
index d8eb83346a6ea..8882484b2304d 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
@@ -1,4 +1,4 @@
-@import 'other3.scss';
+@import 'other3.css';
 
 .className {
   background: red;
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.css
similarity index 100%
rename from test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
rename to test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.css
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.css
similarity index 100%
rename from test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
rename to test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.css
diff --git a/test/integration/scss-modules/test/index.test.js b/test/integration/scss-modules/test/index.test.js
index 242d4eb38762e..94645c769bace 100644
--- a/test/integration/scss-modules/test/index.test.js
+++ b/test/integration/scss-modules/test/index.test.js
@@ -325,7 +325,7 @@ describe('SCSS modules', () => {
 
       const cssPreload = $('#nm-div')
       expect(cssPreload.text()).toMatchInlineSnapshot(
-        `"{\\"message\\":\\"Why hello there\\"} {\\"subClass\\":\\"example_subClass__2YUgj other_className__bt_-E\\"}"`
+        `"{\\"message\\":\\"Why hello there\\"} {\\"subClass\\":\\"example_subClass__2EbKX other_className__E6nd8\\"}"`
       )
     })
 
@@ -341,7 +341,7 @@ describe('SCSS modules', () => {
       expect(
         cssContent.replace(/\/\*.*?\*\//g, '').trim()
       ).toMatchInlineSnapshot(
-        `".other3_other3__1f9h7{color:violet}.other_className__bt_-E{background:red;color:#ff0}.other2_other2__2PUfY{color:red}.example_subClass__2YUgj{background:#00f}"`
+        `".other3_other3__1f9h7{color:violet}.other_className__E6nd8{background:red;color:#ff0}.other2_other2__2PUfY{color:red}.example_subClass__2EbKX{background:#00f}"`
       )
     })
   })

From ac9288d0fd5ec663ede4a10af361d14ba0eec6cf Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Sun, 19 Jan 2020 16:42:28 -0700
Subject: [PATCH 10/34] Fix formatting with prettier fix

---
 .../build/webpack/config/blocks/css/getCssModuleLocalIdent.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts b/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts
index e2a91edd1050c..615710b70a09f 100644
--- a/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts
+++ b/packages/next/build/webpack/config/blocks/css/getCssModuleLocalIdent.ts
@@ -19,8 +19,8 @@ export function getCssModuleLocalIdent(
       relativePath.endsWith('index.module.scss') ||
       relativePath.endsWith('index.module.sass')) &&
     relativePath !== 'pages/index.module.css' &&
-      relativePath !== 'pages/index.module.scss' &&
-      relativePath !== 'pages/index.module.sass'
+    relativePath !== 'pages/index.module.scss' &&
+    relativePath !== 'pages/index.module.sass'
       ? '[folder]'
       : '[name]'
 

From 7095ed581e59290cf435efae9d8b8c1b9b90a989 Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Mon, 20 Jan 2020 13:22:18 +0100
Subject: [PATCH 11/34] Update test output to reflect scss usage

---
 test/integration/scss-modules/test/index.test.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/integration/scss-modules/test/index.test.js b/test/integration/scss-modules/test/index.test.js
index 242d4eb38762e..5432b55a8f6ec 100644
--- a/test/integration/scss-modules/test/index.test.js
+++ b/test/integration/scss-modules/test/index.test.js
@@ -325,7 +325,7 @@ describe('SCSS modules', () => {
 
       const cssPreload = $('#nm-div')
       expect(cssPreload.text()).toMatchInlineSnapshot(
-        `"{\\"message\\":\\"Why hello there\\"} {\\"subClass\\":\\"example_subClass__2YUgj other_className__bt_-E\\"}"`
+        `"{\\"message\\":\\"Why hello there\\"} {\\"other2\\":\\"example_other2__1pnJV\\",\\"subClass\\":\\"example_subClass__2EbKX other_className__E6nd8\\"}"`
       )
     })
 
@@ -341,7 +341,7 @@ describe('SCSS modules', () => {
       expect(
         cssContent.replace(/\/\*.*?\*\//g, '').trim()
       ).toMatchInlineSnapshot(
-        `".other3_other3__1f9h7{color:violet}.other_className__bt_-E{background:red;color:#ff0}.other2_other2__2PUfY{color:red}.example_subClass__2YUgj{background:#00f}"`
+        `".other_other3__ZPN-Y{color:violet}.other_className__E6nd8{background:red;color:#ff0}.example_other2__1pnJV{color:red}.example_subClass__2EbKX{background:#00f}"`
       )
     })
   })

From bd25e8ebb7b61ccd09fe15c4ed6a1a8c0fe9c451 Mon Sep 17 00:00:00 2001
From: Tim Neutkens <timneutkens@me.com>
Date: Mon, 20 Jan 2020 13:24:16 +0100
Subject: [PATCH 12/34] Revert "Fix plain CSS import test"

This reverts commit 380319d9d0c4bfb19e28c210262ccd82d19f3556.

# Conflicts:
#	test/integration/scss-modules/test/index.test.js
---
 .../nm-module-nested/node_modules/example/index.module.scss     | 2 +-
 .../nm-module-nested/node_modules/example/other.scss            | 2 +-
 .../node_modules/example/{other2.css => other2.scss}            | 0
 .../node_modules/example/{other3.css => other3.scss}            | 0
 4 files changed, 2 insertions(+), 2 deletions(-)
 rename test/integration/scss-fixtures/nm-module-nested/node_modules/example/{other2.css => other2.scss} (100%)
 rename test/integration/scss-fixtures/nm-module-nested/node_modules/example/{other3.css => other3.scss} (100%)

diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
index 095246f28de48..aed5852ba6873 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
@@ -1,4 +1,4 @@
-@import 'other2.css';
+@import 'other2.scss';
 
 .subClass {
   composes: className from './other.scss';
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
index 8882484b2304d..d8eb83346a6ea 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
@@ -1,4 +1,4 @@
-@import 'other3.css';
+@import 'other3.scss';
 
 .className {
   background: red;
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.css b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
similarity index 100%
rename from test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.css
rename to test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.css b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
similarity index 100%
rename from test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.css
rename to test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss

From c2715716d48d7ef18d0cbc6dd4cbde1c9bcd58ac Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Mon, 20 Jan 2020 14:18:50 -0700
Subject: [PATCH 13/34] Update loader structure

* Resolve loaders before passing to compile function

* Remove dead filter  code

* Arrange loaders in order and push to array
---
 .../build/webpack/config/blocks/css/index.ts  | 45 ++++++++++---------
 1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index 72d55ca12cce2..837d2267d14c3 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -136,27 +136,11 @@ export const css = curry(async function css(
     cssOptions: webpack.ParserOptions,
     preProcessor: string
   ) {
-    const loaders: webpack.RuleSetUseItem[] = [
-      // Resolve CSS `@import`s and `url()`s
-      {
-        loader: require.resolve('css-loader'),
-        options: cssOptions,
-      },
-
-      // Compile CSS
-      {
-        loader: require.resolve('postcss-loader'),
-        options: {
-          ident: '__nextjs_postcss',
-          plugins: postCssPlugins,
-          sourceMap: true,
-        },
-      },
-    ].filter(Boolean)
+    const loaders: webpack.RuleSetUseItem[] = []
 
     // Add appropriate development mode or production mode style loader first
     if (ctx.isClient) {
-      loaders.unshift(
+      loaders.push(
         getClientStyleLoader({
           isDevelopment: ctx.isDevelopment,
           assetPrefix: ctx.assetPrefix,
@@ -167,13 +151,32 @@ export const css = curry(async function css(
     // Add preprocessor loader
     if (preProcessor) {
       loaders.push({
-        loader: require.resolve(preProcessor),
+        loader: preProcessor,
         options: {
           sourceMap: true,
         },
       })
     }
 
+    // Add remaining loaders
+    loaders.push(
+      // Resolve CSS `@import`s and `url()`s
+      {
+        loader: require.resolve('css-loader'),
+        options: cssOptions,
+      },
+
+      // Compile CSS
+      {
+        loader: require.resolve('postcss-loader'),
+        options: {
+          ident: '__nextjs_postcss',
+          plugins: postCssPlugins,
+          sourceMap: true,
+        },
+      }
+    )
+
     return loaders
   }
 
@@ -235,7 +238,7 @@ export const css = curry(async function css(
                 getLocalIdent: getCssModuleLocalIdent,
               },
             },
-            'sass-loader'
+            require.resolve('sass-loader')
           ),
         },
         // Opt-in support for SASS (using .scss or .sass extensions).
@@ -272,7 +275,7 @@ export const css = curry(async function css(
                 getLocalIdent: getCssModuleLocalIdent,
               },
             },
-            'sass-loader'
+            require.resolve('sass-loader')
           ),
         },
       ],

From 5bc4e720483deaf12caef8a67cf004bf2fc095de Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Mon, 20 Jan 2020 14:38:07 -0700
Subject: [PATCH 14/34] Fix loader order bug

---
 .../build/webpack/config/blocks/css/index.ts  | 22 +++++++++----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index 837d2267d14c3..f764e9b5cc54e 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -148,17 +148,7 @@ export const css = curry(async function css(
       )
     }
 
-    // Add preprocessor loader
-    if (preProcessor) {
-      loaders.push({
-        loader: preProcessor,
-        options: {
-          sourceMap: true,
-        },
-      })
-    }
-
-    // Add remaining loaders
+    // Add main loaders
     loaders.push(
       // Resolve CSS `@import`s and `url()`s
       {
@@ -177,6 +167,16 @@ export const css = curry(async function css(
       }
     )
 
+    // Add preprocessor loader
+    if (preProcessor) {
+      loaders.push({
+        loader: preProcessor,
+        options: {
+          sourceMap: true,
+        },
+      })
+    }
+
     return loaders
   }
 

From 0fa30aca8b379826318ac0e2328073a92f966ad4 Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Mon, 20 Jan 2020 18:39:29 -0700
Subject: [PATCH 15/34] Fix global Sass loader and make module prepocessor
 optional

---
 .../build/webpack/config/blocks/css/index.ts  | 45 ++++++++++---------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index f764e9b5cc54e..2eb8df548aed5 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -134,7 +134,7 @@ export const css = curry(async function css(
 
   function getModuleStyleLoader(
     cssOptions: webpack.ParserOptions,
-    preProcessor: string
+    preProcessor?: string
   ) {
     const loaders: webpack.RuleSetUseItem[] = []
 
@@ -221,25 +221,22 @@ export const css = curry(async function css(
             exclude: /node_modules/,
           },
 
-          use: getModuleStyleLoader(
-            {
-              importLoaders: 1,
-              sourceMap: true,
-              onlyLocals: ctx.isServer,
-              modules: {
-                // Disallow global style exports so we can code-split CSS and
-                // not worry about loading order.
-                mode: 'pure',
-                // Generate a friendly production-ready name so it's
-                // reasonably understandable. The same name is used for
-                // development.
-                // TODO: Consider making production reduce this to a single
-                // character?
-                getLocalIdent: getCssModuleLocalIdent,
-              },
+          use: getModuleStyleLoader({
+            importLoaders: 1,
+            sourceMap: true,
+            onlyLocals: ctx.isServer,
+            modules: {
+              // Disallow global style exports so we can code-split CSS and
+              // not worry about loading order.
+              mode: 'pure',
+              // Generate a friendly production-ready name so it's
+              // reasonably understandable. The same name is used for
+              // development.
+              // TODO: Consider making production reduce this to a single
+              // character?
+              getLocalIdent: getCssModuleLocalIdent,
             },
-            require.resolve('sass-loader')
-          ),
+          }),
         },
         // Opt-in support for SASS (using .scss or .sass extensions).
         // By default we support SASS Modules with the
@@ -365,7 +362,7 @@ export const css = curry(async function css(
               // Resolve CSS `@import`s and `url()`s
               {
                 loader: require.resolve('css-loader'),
-                options: { importLoaders: 1, sourceMap: true },
+                options: { importLoaders: 2, sourceMap: true },
               },
 
               // Compile CSS
@@ -377,6 +374,14 @@ export const css = curry(async function css(
                   sourceMap: true,
                 },
               },
+
+              // Preprocess Sass
+              {
+                loader: require.resolve('sass-loader'),
+                options: {
+                  sourceMap: true,
+                },
+              },
             ],
           },
         ],

From c0fb9368fc07f8ccc2c7dc372da9b0f65d1c2b5e Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 11:16:52 -0500
Subject: [PATCH 16/34] Adjust Sass Modules Implementation

---
 .../build/webpack/config/blocks/css/index.ts  | 132 +++++----------
 .../config/blocks/css/loaders/modules.ts      |  11 +-
 packages/next/package.json                    |   1 +
 yarn.lock                                     | 151 +++++++++++++++++-
 4 files changed, 191 insertions(+), 104 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index 5c7ec76a6addd..eed4184cb483d 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -1,12 +1,11 @@
 import curry from 'lodash.curry'
 import path from 'path'
-import webpack, { Configuration } from 'webpack'
+import { Configuration } from 'webpack'
 import MiniCssExtractPlugin from '../../../plugins/mini-css-extract-plugin'
 import { loader, plugin } from '../../helpers'
 import { ConfigurationContext, ConfigurationFn, pipe } from '../../utils'
-import { getGlobalCssLoader } from './loaders'
+import { getCssModuleLoader, getGlobalCssLoader } from './loaders'
 import { getClientStyleLoader } from './loaders/client'
-import { getCssModuleLocalIdent } from './loaders/getCssModuleLocalIdent'
 import {
   getCustomDocumentError,
   getGlobalImportError,
@@ -15,11 +14,14 @@ import {
 } from './messages'
 import { getPostCssPlugins } from './plugins'
 
-// RegExps for Stylesheets
+// RegExps for Style Sheets
 // const regexCssAll = /\.css$/
 const regexCssGlobal = /(?<!\.module)\.css$/
 const regexCssModules = /\.module\.css$/
 
+// RegExps for Syntactically Awesome Style Sheets
+const regexSassModules = /\.module\.css$/
+
 export const css = curry(async function css(
   enabled: boolean,
   ctx: ConfigurationContext,
@@ -51,55 +53,7 @@ export const css = curry(async function css(
     true
   )
 
-  function getModuleStyleLoader(
-    cssOptions: webpack.ParserOptions,
-    preProcessor?: string
-  ) {
-    const loaders: webpack.RuleSetUseItem[] = []
-
-    // Add appropriate development mode or production mode style loader first
-    if (ctx.isClient) {
-      loaders.push(
-        getClientStyleLoader({
-          isDevelopment: ctx.isDevelopment,
-          assetPrefix: ctx.assetPrefix,
-        })
-      )
-    }
-
-    // Add main loaders
-    loaders.push(
-      // Resolve CSS `@import`s and `url()`s
-      {
-        loader: require.resolve('css-loader'),
-        options: cssOptions,
-      },
-
-      // Compile CSS
-      {
-        loader: require.resolve('postcss-loader'),
-        options: {
-          ident: '__nextjs_postcss',
-          plugins: postCssPlugins,
-          sourceMap: true,
-        },
-      }
-    )
-
-    // Add preprocessor loader
-    if (preProcessor) {
-      loaders.push({
-        loader: preProcessor,
-        options: {
-          sourceMap: true,
-        },
-      })
-    }
-
-    return loaders
-  }
-
-  // CSS cannot be imported in _document. This comes before everything because
+  // CSS cannot be imported in _document. This comes before everything b ecause
   // global CSS nor CSS modules work in said file.
   fns.push(
     loader({
@@ -139,60 +93,46 @@ export const css = curry(async function css(
             include: [ctx.rootDirectory],
             exclude: /node_modules/,
           },
-
-          use: getModuleStyleLoader({
-            importLoaders: 1,
-            sourceMap: true,
-            onlyLocals: ctx.isServer,
-            modules: {
-              // Disallow global style exports so we can code-split CSS and
-              // not worry about loading order.
-              mode: 'pure',
-              // Generate a friendly production-ready name so it's
-              // reasonably understandable. The same name is used for
-              // development.
-              // TODO: Consider making production reduce this to a single
-              // character?
-              getLocalIdent: getCssModuleLocalIdent,
-            },
-          }),
+          use: getCssModuleLoader(ctx, postCssPlugins),
         },
-        // Opt-in support for SASS (using .scss or .sass extensions).
-        // By default we support SASS Modules with the
-        // extensions .module.scss or .module.sass
+
+        // Opt-in support for Sass (using .scss or .sass extensions).
         {
-          // CSS Modules should never have side effects. This setting will
-          // allow unused CSS to be removed from the production build.
-          // We ensure this by disallowing `:global()` CSS at the top-level
+          // Sass Modules should never have side effects. This setting will
+          // allow unused Sass to be removed from the production build.
+          // We ensure this by disallowing `:global()` Sass at the top-level
           // via the `pure` mode in `css-loader`.
           sideEffects: false,
-          test: /\.module\.(scss|sass)$/,
-          // CSS Modules are only supported in the user's application. We're
-          // not yet allowing CSS imports _within_ `node_modules`.
+          // Sass Modules are activated via this specific extension.
+          test: regexSassModules,
+          // Sass Modules are only supported in the user's application. We're
+          // not yet allowing Sass imports _within_ `node_modules`.
           issuer: {
             include: [ctx.rootDirectory],
             exclude: /node_modules/,
           },
-
-          use: getModuleStyleLoader(
+          use: getCssModuleLoader(ctx, postCssPlugins, [
             {
-              importLoaders: 2,
-              sourceMap: true,
-              onlyLocals: ctx.isServer,
-              modules: {
-                // Disallow global style exports so we can code-split CSS and
-                // not worry about loading order.
-                mode: 'pure',
-                // Generate a friendly production-ready name so it's
-                // reasonably understandable. The same name is used for
-                // development.
-                // TODO: Consider making production reduce this to a single
-                // character?
-                getLocalIdent: getCssModuleLocalIdent,
+              loader: require.resolve('sass-loader'),
+              options: {
+                // Source maps are required so that `resolve-url-loader` can
+                // locate files original to their source directory.
+                sourceMap: true,
+              },
+            },
+            // `sass-loader` will pass-through CSS imports as-is instead of
+            // inlining them. Once inlined, the paths are no longer correct.
+            // To fix this, we use `resolve-url-loader` to rewrite the CSS
+            // imports to real file paths.
+            {
+              loader: require.resolve('resolve-url-loader'),
+              options: {
+                // Source maps are not required here, but we may as well emit
+                // them.
+                sourceMap: true,
               },
             },
-            require.resolve('sass-loader')
-          ),
+          ]),
         },
       ],
     })
diff --git a/packages/next/build/webpack/config/blocks/css/loaders/modules.ts b/packages/next/build/webpack/config/blocks/css/loaders/modules.ts
index 7775dae450ff8..9069a1c9680f6 100644
--- a/packages/next/build/webpack/config/blocks/css/loaders/modules.ts
+++ b/packages/next/build/webpack/config/blocks/css/loaders/modules.ts
@@ -6,7 +6,8 @@ import { getCssModuleLocalIdent } from './getCssModuleLocalIdent'
 
 export function getCssModuleLoader(
   ctx: ConfigurationContext,
-  postCssPlugins: postcss.AcceptedPlugin[]
+  postCssPlugins: postcss.AcceptedPlugin[],
+  preProcessors: webpack.RuleSetUseItem[] = []
 ): webpack.RuleSetUseItem[] {
   const loaders: webpack.RuleSetUseItem[] = []
 
@@ -25,7 +26,7 @@ export function getCssModuleLoader(
   loaders.push({
     loader: require.resolve('css-loader'),
     options: {
-      importLoaders: 1,
+      importLoaders: 1 + preProcessors.length,
       sourceMap: true,
       onlyLocals: ctx.isServer,
       modules: {
@@ -52,5 +53,11 @@ export function getCssModuleLoader(
     },
   })
 
+  loaders.push(
+    // Webpack loaders run like a stack, so we need to reverse the natural
+    // order of preprocessors.
+    ...preProcessors.reverse()
+  )
+
   return loaders
 }
diff --git a/packages/next/package.json b/packages/next/package.json
index 67cea8519629e..1e08b792462e4 100644
--- a/packages/next/package.json
+++ b/packages/next/package.json
@@ -122,6 +122,7 @@
     "raw-body": "2.4.0",
     "react-error-overlay": "5.1.6",
     "react-is": "16.8.6",
+    "resolve-url-loader": "3.1.1",
     "sass-loader": "8.0.2",
     "send": "0.17.1",
     "source-map": "0.6.1",
diff --git a/yarn.lock b/yarn.lock
index 04fd7d8499fb0..907b2f185d5e2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3031,6 +3031,17 @@ acorn@^7.1.0:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.0.tgz#949d36f2c292535da602283586c2477c57eb2d6c"
   integrity sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==
 
+adjust-sourcemap-loader@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/adjust-sourcemap-loader/-/adjust-sourcemap-loader-2.0.0.tgz#6471143af75ec02334b219f54bc7970c52fb29a4"
+  integrity sha512-4hFsTsn58+YjrU9qKzML2JSSDqKvN8mUGQ0nNIrfPi8hmIONT4L3uUaT6MKdMsZ9AjsU6D2xDkZxCkbQPxChrA==
+  dependencies:
+    assert "1.4.1"
+    camelcase "5.0.0"
+    loader-utils "1.2.3"
+    object-path "0.11.4"
+    regex-parser "2.2.10"
+
 after-all-results@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/after-all-results/-/after-all-results-2.0.0.tgz#6ac2fc202b500f88da8f4f5530cfa100f4c6a2d0"
@@ -3237,6 +3248,11 @@ args@4.0.0:
     leven "2.1.0"
     mri "1.1.0"
 
+arity-n@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/arity-n/-/arity-n-1.0.4.tgz#d9e76b11733e08569c0847ae7b39b2860b30b745"
+  integrity sha1-2edrEXM+CFacCEeuezmyhgswt0U=
+
 arr-diff@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-2.0.0.tgz#8f3b827f955a8bd669697e4a4256ac3ceae356cf"
@@ -3359,6 +3375,13 @@ assert-plus@1.0.0, assert-plus@^1.0.0:
   resolved "https://registry.yarnpkg.com/assert-plus/-/assert-plus-1.0.0.tgz#f12e0f3c5d77b0b1cdd9146942e4e96c1e4dd525"
   integrity sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=
 
+assert@1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/assert/-/assert-1.4.1.tgz#99912d591836b5a6f5b345c0f07eefc08fc65d91"
+  integrity sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=
+  dependencies:
+    util "0.10.3"
+
 assert@^1.1.1:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/assert/-/assert-1.5.0.tgz#55c109aaf6e0aefdb3dc4b71240c70bf574b18eb"
@@ -4090,6 +4113,11 @@ camelcase@5.0.0:
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.0.0.tgz#03295527d58bd3cd4aa75363f35b2e8d97be2f42"
   integrity sha512-faqwZqnWxbxn+F1d399ygeamQNy3lPp/H9H6rNrqYh4FSVCtcY+3cub1MxA8o9mDd55mM8Aghuu/kuyYA6VTsA==
 
+camelcase@5.3.1, camelcase@^5.0.0, camelcase@^5.3.1:
+  version "5.3.1"
+  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.3.1.tgz#e3c9b31569e106811df242f715725a1f4c494320"
+  integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
+
 camelcase@^2.0.0, camelcase@^2.0.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-2.1.1.tgz#7c1d16d679a1bbe59ca02cacecfb011e201f5a1f"
@@ -4105,11 +4133,6 @@ camelcase@^4.1.0:
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
   integrity sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=
 
-camelcase@^5.0.0, camelcase@^5.3.1:
-  version "5.3.1"
-  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.3.1.tgz#e3c9b31569e106811df242f715725a1f4c494320"
-  integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
-
 caniuse-api@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/caniuse-api/-/caniuse-api-3.0.0.tgz#5e4d90e2274961d46291997df599e3ed008ee4c0"
@@ -4598,6 +4621,13 @@ component-emitter@^1.2.0, component-emitter@^1.2.1:
   resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.3.0.tgz#16e4070fba8ae29b679f2215853ee181ab2eabc0"
   integrity sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg==
 
+compose-function@3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/compose-function/-/compose-function-3.0.3.tgz#9ed675f13cc54501d30950a486ff6a7ba3ab185f"
+  integrity sha1-ntZ18TzFRQHTCVCkhv9qe6OrGF8=
+  dependencies:
+    arity-n "^1.0.4"
+
 compressible@~2.0.16:
   version "2.0.18"
   resolved "https://registry.yarnpkg.com/compressible/-/compressible-2.0.18.tgz#af53cca6b070d4c3c0750fbd77286a6d7cc46fba"
@@ -4801,6 +4831,11 @@ convert-source-map@1.7.0, convert-source-map@^1.4.0, convert-source-map@^1.7.0:
   dependencies:
     safe-buffer "~5.1.1"
 
+convert-source-map@^0.3.3:
+  version "0.3.5"
+  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-0.3.5.tgz#f1d802950af7dd2631a1febe0596550c86ab3190"
+  integrity sha1-8dgClQr33SYxof6+BZZVDIarMZA=
+
 cookie-signature@1.0.6:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/cookie-signature/-/cookie-signature-1.0.6.tgz#e303a882b342cc3ee8ca513a79999734dab3ae2c"
@@ -5144,7 +5179,7 @@ css-what@^3.2.1:
   resolved "https://registry.yarnpkg.com/css-what/-/css-what-3.2.1.tgz#f4a8f12421064621b456755e34a03a2c22df5da1"
   integrity sha512-WwOrosiQTvyms+Ti5ZC5vGEK0Vod3FTt1ca+payZqvKuGJF+dq7bG63DstxtN0dpm6FxY27a/zS3Wten+gEtGw==
 
-css@2.2.4:
+css@2.2.4, css@^2.0.0:
   version "2.2.4"
   resolved "https://registry.yarnpkg.com/css/-/css-2.2.4.tgz#c646755c73971f2bba6a601e2cf2fd71b1298929"
   integrity sha512-oUnjmWpy0niI3x/mPL8dVEI1l7MnG3+HHyRPHf+YFSbK+svOhXpmSOcDURUh2aOCgl2grzrOPt1nHLuCVFULLw==
@@ -5300,6 +5335,14 @@ cyclist@^1.0.1:
   resolved "https://registry.yarnpkg.com/cyclist/-/cyclist-1.0.1.tgz#596e9698fd0c80e12038c2b82d6eb1b35b6224d9"
   integrity sha1-WW6WmP0MgOEgOMK4LW6xs1tiJNk=
 
+d@1, d@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/d/-/d-1.0.1.tgz#8698095372d58dbee346ffd0c7093f99f8f9eb5a"
+  integrity sha512-m62ShEObQ39CfralilEQRjH6oAMtNCV1xJyEx5LpRYUVN+EviphDgUc/F3hnYbADmkiNs67Y+3ylmlG7Lnu+FA==
+  dependencies:
+    es5-ext "^0.10.50"
+    type "^1.0.1"
+
 dargs@^4.0.1:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/dargs/-/dargs-4.1.0.tgz#03a9dbb4b5c2f139bf14ae53f0b8a2a6a86f4e17"
@@ -5854,6 +5897,24 @@ es-to-primitive@^1.2.1:
     is-date-object "^1.0.1"
     is-symbol "^1.0.2"
 
+es5-ext@^0.10.35, es5-ext@^0.10.50:
+  version "0.10.53"
+  resolved "https://registry.yarnpkg.com/es5-ext/-/es5-ext-0.10.53.tgz#93c5a3acfdbef275220ad72644ad02ee18368de1"
+  integrity sha512-Xs2Stw6NiNHWypzRTY1MtaG/uJlwCk8kH81920ma8mvN8Xq1gsfhZvpkImLQArw8AHnv8MT2I45J3c0R8slE+Q==
+  dependencies:
+    es6-iterator "~2.0.3"
+    es6-symbol "~3.1.3"
+    next-tick "~1.0.0"
+
+es6-iterator@2.0.3, es6-iterator@~2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/es6-iterator/-/es6-iterator-2.0.3.tgz#a7de889141a05a94b0854403b2d0a0fbfa98f3b7"
+  integrity sha1-p96IkUGgWpSwhUQDstCg+/qY87c=
+  dependencies:
+    d "1"
+    es5-ext "^0.10.35"
+    es6-symbol "^3.1.1"
+
 es6-promise@^4.0.3, es6-promise@^4.1.1:
   version "4.2.8"
   resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.2.8.tgz#4eb21594c972bc40553d276e510539143db53e0a"
@@ -5866,6 +5927,14 @@ es6-promisify@^5.0.0:
   dependencies:
     es6-promise "^4.0.3"
 
+es6-symbol@^3.1.1, es6-symbol@~3.1.3:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/es6-symbol/-/es6-symbol-3.1.3.tgz#bad5d3c1bcdac28269f4cb331e431c78ac705d18"
+  integrity sha512-NJ6Yn3FuDinBaBRWl/q5X/s4koRHBrgKAu+yGI6JCBeiu3qrcbJhwT2GeR/EXVfylRk8dpQVJoLEFhK+Mu31NA==
+  dependencies:
+    d "^1.0.1"
+    ext "^1.1.2"
+
 escape-goat@1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/escape-goat/-/escape-goat-1.3.0.tgz#bf3ee8ad1e488fbba404b084b2e4a55e09231c64"
@@ -6244,6 +6313,13 @@ express@^4.16.3:
     utils-merge "1.0.1"
     vary "~1.1.2"
 
+ext@^1.1.2:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/ext/-/ext-1.4.0.tgz#89ae7a07158f79d35517882904324077e4379244"
+  integrity sha512-Key5NIsUxdqKg3vIsdw9dSuXpPCQ297y6wBjL30edxwPgt2E44WcWBZey/ZvUc6sERLTxKdyCu4gZFmUbk1Q7A==
+  dependencies:
+    type "^2.0.0"
+
 extend-shallow@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-2.0.1.tgz#51af7d614ad9a9f610ea1bafbb989d6b1c56890f"
@@ -10120,6 +10196,11 @@ nested-error-stacks@^2.0.0, nested-error-stacks@^2.1.0:
   resolved "https://registry.yarnpkg.com/nested-error-stacks/-/nested-error-stacks-2.1.0.tgz#0fbdcf3e13fe4994781280524f8b96b0cdff9c61"
   integrity sha512-AO81vsIO1k1sM4Zrd6Hu7regmJN1NSiAja10gc4bX3F0wd+9rQmcuHQaHVQCYIEC8iFXnE+mavh23GOt7wBgug==
 
+next-tick@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/next-tick/-/next-tick-1.0.0.tgz#ca86d1fe8828169b0120208e3dc8424b9db8342c"
+  integrity sha1-yobR/ogoFpsBICCOPchCS524NCw=
+
 nice-try@^1.0.4:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
@@ -10568,6 +10649,11 @@ object-keys@~0.4.0:
   resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-0.4.0.tgz#28a6aae7428dd2c3a92f3d95f21335dd204e0336"
   integrity sha1-KKaq50KN0sOpLz2V8hM13SBOAzY=
 
+object-path@0.11.4:
+  version "0.11.4"
+  resolved "https://registry.yarnpkg.com/object-path/-/object-path-0.11.4.tgz#370ae752fbf37de3ea70a861c23bba8915691949"
+  integrity sha1-NwrnUvvzfePqcKhhwju6iRVpGUk=
+
 object-visit@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/object-visit/-/object-visit-1.0.1.tgz#f79c4493af0c5377b59fe39d395e41042dd045bb"
@@ -12058,6 +12144,15 @@ postcss-values-parser@^2.0.0, postcss-values-parser@^2.0.1:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
+postcss@7.0.21:
+  version "7.0.21"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.21.tgz#06bb07824c19c2021c5d056d5b10c35b989f7e17"
+  integrity sha512-uIFtJElxJo29QC753JzhidoAhvp/e/Exezkdhfmt8AymWT6/5B7W1WmponYWkHk2eg6sONyTch0A3nkMPun3SQ==
+  dependencies:
+    chalk "^2.4.2"
+    source-map "^0.6.1"
+    supports-color "^6.1.0"
+
 postcss@^5.0.10:
   version "5.2.18"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-5.2.18.tgz#badfa1497d46244f6390f58b319830d9107853c5"
@@ -12731,6 +12826,11 @@ regex-not@^1.0.0, regex-not@^1.0.2:
     extend-shallow "^3.0.2"
     safe-regex "^1.1.0"
 
+regex-parser@2.2.10:
+  version "2.2.10"
+  resolved "https://registry.yarnpkg.com/regex-parser/-/regex-parser-2.2.10.tgz#9e66a8f73d89a107616e63b39d4deddfee912b37"
+  integrity sha512-8t6074A68gHfU8Neftl0Le6KTDwfGAj7IyjPIMSfikI2wJUTHDMaIq42bUsfVnj8mhx0R+45rdUXHGpN164avA==
+
 regexpp@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/regexpp/-/regexpp-2.0.1.tgz#8d19d31cf632482b589049f8281f93dbcba4d07f"
@@ -13038,6 +13138,22 @@ resolve-from@^4.0.0:
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-4.0.0.tgz#4abcd852ad32dd7baabfe9b40e00a36db5f392e6"
   integrity sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==
 
+resolve-url-loader@3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/resolve-url-loader/-/resolve-url-loader-3.1.1.tgz#28931895fa1eab9be0647d3b2958c100ae3c0bf0"
+  integrity sha512-K1N5xUjj7v0l2j/3Sgs5b8CjrrgtC70SmdCuZiJ8tSyb5J+uk3FoeZ4b7yTnH6j7ngI+Bc5bldHJIa8hYdu2gQ==
+  dependencies:
+    adjust-sourcemap-loader "2.0.0"
+    camelcase "5.3.1"
+    compose-function "3.0.3"
+    convert-source-map "1.7.0"
+    es6-iterator "2.0.3"
+    loader-utils "1.2.3"
+    postcss "7.0.21"
+    rework "1.0.1"
+    rework-visit "1.0.0"
+    source-map "0.6.1"
+
 resolve-url@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
@@ -13112,6 +13228,19 @@ reusify@^1.0.0:
   resolved "https://registry.yarnpkg.com/reusify/-/reusify-1.0.4.tgz#90da382b1e126efc02146e90845a88db12925d76"
   integrity sha512-U9nH88a3fc/ekCF1l0/UP1IosiuIjyTh7hBvXVMHYgVcfGvt897Xguj2UOLDeI5BG2m7/uwyaLVT6fbtCwTyzw==
 
+rework-visit@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/rework-visit/-/rework-visit-1.0.0.tgz#9945b2803f219e2f7aca00adb8bc9f640f842c9a"
+  integrity sha1-mUWygD8hni96ygCtuLyfZA+ELJo=
+
+rework@1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/rework/-/rework-1.0.1.tgz#30806a841342b54510aa4110850cd48534144aa7"
+  integrity sha1-MIBqhBNCtUUQqkEQhQzUhTQUSqc=
+  dependencies:
+    convert-source-map "^0.3.3"
+    css "^2.0.0"
+
 rewrite-imports@^1.0.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/rewrite-imports/-/rewrite-imports-1.4.0.tgz#198ebb73f59cfee8d214516c774b6aeef2c54a6e"
@@ -14697,6 +14826,16 @@ type-is@~1.6.17, type-is@~1.6.18:
     media-typer "0.3.0"
     mime-types "~2.1.24"
 
+type@^1.0.1:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/type/-/type-1.2.0.tgz#848dd7698dafa3e54a6c479e759c4bc3f18847a0"
+  integrity sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg==
+
+type@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/type/-/type-2.0.0.tgz#5f16ff6ef2eb44f260494dae271033b29c09a9c3"
+  integrity sha512-KBt58xCHry4Cejnc2ISQAF7QY+ORngsWfxezO68+12hKV6lQY8P/psIkcbjeHWn7MqcgciWJyCCevFMJdIXpow==
+
 typedarray-to-buffer@^3.1.5:
   version "3.1.5"
   resolved "https://registry.yarnpkg.com/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz#a97ee7a9ff42691b9f783ff1bc5112fe3fca9080"

From d54ba9efe16ec3f2fece14f14c10f37d4818d2d6 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 11:18:53 -0500
Subject: [PATCH 17/34] Fix typo

---
 packages/next/build/webpack/config/blocks/css/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index eed4184cb483d..4b57f68a2d91f 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -53,7 +53,7 @@ export const css = curry(async function css(
     true
   )
 
-  // CSS cannot be imported in _document. This comes before everything b ecause
+  // CSS cannot be imported in _document. This comes before everything because
   // global CSS nor CSS modules work in said file.
   fns.push(
     loader({

From 4cb6e9bffd34cfc44702a1d09be6303599a914aa Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 11:20:51 -0500
Subject: [PATCH 18/34] Adjust regexps

---
 packages/next/build/webpack/config/blocks/css/index.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index 4b57f68a2d91f..d57c8282d1c6b 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -14,13 +14,15 @@ import {
 } from './messages'
 import { getPostCssPlugins } from './plugins'
 
+// RegExps for all Style Sheet variants
+const regexLikeCss = /\.(css|scss|sass)$/
+
 // RegExps for Style Sheets
-// const regexCssAll = /\.css$/
 const regexCssGlobal = /(?<!\.module)\.css$/
 const regexCssModules = /\.module\.css$/
 
 // RegExps for Syntactically Awesome Style Sheets
-const regexSassModules = /\.module\.css$/
+const regexSassModules = /\.module\.(scss|sass)$/
 
 export const css = curry(async function css(
   enabled: boolean,
@@ -59,7 +61,7 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: /\.(css|scss|sass)$/,
+          test: regexLikeCss,
           // Use a loose regex so we don't have to crawl the file system to
           // find the real file name (if present).
           issuer: { test: /pages[\\/]_document\./ },

From 20ce297331afddc814eaea1a355af22269a53cd1 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 11:24:22 -0500
Subject: [PATCH 19/34] Use regexes

---
 packages/next/build/webpack/config/blocks/css/index.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index d57c8282d1c6b..8b42ff8a237e4 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -22,6 +22,7 @@ const regexCssGlobal = /(?<!\.module)\.css$/
 const regexCssModules = /\.module\.css$/
 
 // RegExps for Syntactically Awesome Style Sheets
+const regexSassGlobal = /(?<!\.module)\.(scss|sass)$/
 const regexSassModules = /\.module\.(scss|sass)$/
 
 export const css = curry(async function css(
@@ -145,7 +146,7 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: /\.module\.(css|scss|sass)$/,
+          test: [regexCssModules, regexSassModules],
           use: {
             loader: 'error-loader',
             options: {
@@ -231,7 +232,7 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: /\.(css|scss|sass)$/,
+          test: [regexCssGlobal, regexSassGlobal],
           issuer: { include: [/node_modules/] },
           use: {
             loader: 'error-loader',
@@ -249,7 +250,7 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: /\.(css|scss|sass)$/,
+          test: [regexCssGlobal, regexSassGlobal],
           use: {
             loader: 'error-loader',
             options: {
@@ -272,7 +273,7 @@ export const css = curry(async function css(
         oneOf: [
           {
             // This should only be applied to CSS files
-            issuer: { test: /\.(css|scss|sass)$/ },
+            issuer: { test: regexLikeCss },
             // Exclude extensions that webpack handles by default
             exclude: [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
             use: {

From 1039a23d640f94d8464a790748699f5c072b628e Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 11:27:55 -0500
Subject: [PATCH 20/34] Simplify global setup

---
 .../build/webpack/config/blocks/css/index.ts  | 89 ++++++-------------
 .../config/blocks/css/loaders/global.ts       | 11 ++-
 2 files changed, 38 insertions(+), 62 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index 8b42ff8a237e4..7ca81d268b697 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -1,11 +1,10 @@
 import curry from 'lodash.curry'
 import path from 'path'
-import { Configuration } from 'webpack'
+import webpack, { Configuration } from 'webpack'
 import MiniCssExtractPlugin from '../../../plugins/mini-css-extract-plugin'
 import { loader, plugin } from '../../helpers'
 import { ConfigurationContext, ConfigurationFn, pipe } from '../../utils'
 import { getCssModuleLoader, getGlobalCssLoader } from './loaders'
-import { getClientStyleLoader } from './loaders/client'
 import {
   getCustomDocumentError,
   getGlobalImportError,
@@ -34,6 +33,29 @@ export const css = curry(async function css(
     return config
   }
 
+  const sassPreprocessors: webpack.RuleSetUseItem[] = [
+    {
+      loader: require.resolve('sass-loader'),
+      options: {
+        // Source maps are required so that `resolve-url-loader` can
+        // locate files original to their source directory.
+        sourceMap: true,
+      },
+    },
+    // `sass-loader` will pass-through CSS imports as-is instead of
+    // inlining them. Once inlined, the paths are no longer correct.
+    // To fix this, we use `resolve-url-loader` to rewrite the CSS
+    // imports to real file paths.
+    {
+      loader: require.resolve('resolve-url-loader'),
+      options: {
+        // Source maps are not required here, but we may as well emit
+        // them.
+        sourceMap: true,
+      },
+    },
+  ]
+
   const fns: ConfigurationFn[] = [
     loader({
       oneOf: [
@@ -114,28 +136,7 @@ export const css = curry(async function css(
             include: [ctx.rootDirectory],
             exclude: /node_modules/,
           },
-          use: getCssModuleLoader(ctx, postCssPlugins, [
-            {
-              loader: require.resolve('sass-loader'),
-              options: {
-                // Source maps are required so that `resolve-url-loader` can
-                // locate files original to their source directory.
-                sourceMap: true,
-              },
-            },
-            // `sass-loader` will pass-through CSS imports as-is instead of
-            // inlining them. Once inlined, the paths are no longer correct.
-            // To fix this, we use `resolve-url-loader` to rewrite the CSS
-            // imports to real file paths.
-            {
-              loader: require.resolve('resolve-url-loader'),
-              options: {
-                // Source maps are not required here, but we may as well emit
-                // them.
-                sourceMap: true,
-              },
-            },
-          ]),
+          use: getCssModuleLoader(ctx, postCssPlugins, sassPreprocessors),
         },
       ],
     })
@@ -181,46 +182,14 @@ export const css = curry(async function css(
             use: getGlobalCssLoader(ctx, postCssPlugins),
           },
           {
-            // A global CSS import always has side effects. Webpack will tree
-            // shake the CSS without this option if the issuer claims to have
+            // A global Sass import always has side effects. Webpack will tree
+            // shake the Sass without this option if the issuer claims to have
             // no side-effects.
             // See https://github.com/webpack/webpack/issues/6571
             sideEffects: true,
-            test: /\.(scss|sass)$/,
+            test: regexSassGlobal,
             issuer: { include: ctx.customAppFile },
-
-            use: [
-              // Add appropriate development more or production mode style
-              // loader
-              getClientStyleLoader({
-                isDevelopment: ctx.isDevelopment,
-                assetPrefix: ctx.assetPrefix,
-              }),
-
-              // Resolve CSS `@import`s and `url()`s
-              {
-                loader: require.resolve('css-loader'),
-                options: { importLoaders: 2, sourceMap: true },
-              },
-
-              // Compile CSS
-              {
-                loader: require.resolve('postcss-loader'),
-                options: {
-                  ident: '__nextjs_postcss',
-                  plugins: postCssPlugins,
-                  sourceMap: true,
-                },
-              },
-
-              // Preprocess Sass
-              {
-                loader: require.resolve('sass-loader'),
-                options: {
-                  sourceMap: true,
-                },
-              },
-            ],
+            use: getGlobalCssLoader(ctx, postCssPlugins, sassPreprocessors),
           },
         ],
       })
diff --git a/packages/next/build/webpack/config/blocks/css/loaders/global.ts b/packages/next/build/webpack/config/blocks/css/loaders/global.ts
index 133ea5e68120a..a5dcf146ff130 100644
--- a/packages/next/build/webpack/config/blocks/css/loaders/global.ts
+++ b/packages/next/build/webpack/config/blocks/css/loaders/global.ts
@@ -5,7 +5,8 @@ import { getClientStyleLoader } from './client'
 
 export function getGlobalCssLoader(
   ctx: ConfigurationContext,
-  postCssPlugins: postcss.AcceptedPlugin[]
+  postCssPlugins: postcss.AcceptedPlugin[],
+  preProcessors: webpack.RuleSetUseItem[] = []
 ): webpack.RuleSetUseItem[] {
   const loaders: webpack.RuleSetUseItem[] = []
 
@@ -23,7 +24,7 @@ export function getGlobalCssLoader(
   // Resolve CSS `@import`s and `url()`s
   loaders.push({
     loader: require.resolve('css-loader'),
-    options: { importLoaders: 1, sourceMap: true },
+    options: { importLoaders: 1 + preProcessors.length, sourceMap: true },
   })
 
   // Compile CSS
@@ -36,5 +37,11 @@ export function getGlobalCssLoader(
     },
   })
 
+  loaders.push(
+    // Webpack loaders run like a stack, so we need to reverse the natural
+    // order of preprocessors.
+    ...preProcessors.reverse()
+  )
+
   return loaders
 }

From ba5e73f5627c87cf26b32d1afbbaa130f099fb57 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 11:30:21 -0500
Subject: [PATCH 21/34] Adjust comments

---
 .../next/build/webpack/config/blocks/css/index.ts     | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index 7ca81d268b697..a02dc5a7a9bd5 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -34,16 +34,19 @@ export const css = curry(async function css(
   }
 
   const sassPreprocessors: webpack.RuleSetUseItem[] = [
+    // First, process files with `sass-loader`: this inlines content, and
+    // compiles away the proprietary syntax.
     {
       loader: require.resolve('sass-loader'),
       options: {
-        // Source maps are required so that `resolve-url-loader` can
-        // locate files original to their source directory.
+        // Source maps are required so that `resolve-url-loader` can locate
+        // files original to their source directory.
         sourceMap: true,
       },
     },
-    // `sass-loader` will pass-through CSS imports as-is instead of
-    // inlining them. Once inlined, the paths are no longer correct.
+    // Then, `sass-loader` will have passed-through CSS imports as-is instead
+    // of inlining them. Because they were inlined, the paths are no longer
+    // correct.
     // To fix this, we use `resolve-url-loader` to rewrite the CSS
     // imports to real file paths.
     {

From 711837bdae0082b73c0af207a6dfe5f14945cce1 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 11:46:21 -0500
Subject: [PATCH 22/34] fix regex

---
 packages/next/build/webpack/config/blocks/css/index.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index a02dc5a7a9bd5..aa866c1d71b6d 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -166,7 +166,10 @@ export const css = curry(async function css(
     fns.push(
       loader({
         oneOf: [
-          { test: /\.(css|scss|sass)$/, use: require.resolve('ignore-loader') },
+          {
+            test: [regexCssGlobal, regexSassGlobal],
+            use: require.resolve('ignore-loader'),
+          },
         ],
       })
     )

From dca6b50c735356e2d48cd526f7c6fe903bd206e4 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 13:27:53 -0500
Subject: [PATCH 23/34] Simplify identifier file

---
 .../blocks/css/loaders/getCssModuleLocalIdent.ts   | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/packages/next/build/webpack/config/blocks/css/loaders/getCssModuleLocalIdent.ts b/packages/next/build/webpack/config/blocks/css/loaders/getCssModuleLocalIdent.ts
index 615710b70a09f..168574bab0575 100644
--- a/packages/next/build/webpack/config/blocks/css/loaders/getCssModuleLocalIdent.ts
+++ b/packages/next/build/webpack/config/blocks/css/loaders/getCssModuleLocalIdent.ts
@@ -2,6 +2,8 @@ import loaderUtils from 'loader-utils'
 import path from 'path'
 import webpack from 'webpack'
 
+const regexLikeIndexModule = /(?<!pages[\\/])index\.module\.(scss|sass|css)$/
+
 export function getCssModuleLocalIdent(
   context: webpack.loader.LoaderContext,
   _: any,
@@ -14,15 +16,9 @@ export function getCssModuleLocalIdent(
 
   // Generate a more meaningful name (parent folder) when the user names the
   // file `index.module.css`.
-  const fileNameOrFolder =
-    (relativePath.endsWith('index.module.css') ||
-      relativePath.endsWith('index.module.scss') ||
-      relativePath.endsWith('index.module.sass')) &&
-    relativePath !== 'pages/index.module.css' &&
-    relativePath !== 'pages/index.module.scss' &&
-    relativePath !== 'pages/index.module.sass'
-      ? '[folder]'
-      : '[name]'
+  const fileNameOrFolder = regexLikeIndexModule.test(relativePath)
+    ? '[folder]'
+    : '[name]'
 
   // Generate a hash to make the class name unique.
   const hash = loaderUtils.getHashDigest(

From feab92363f8aa47855bba39f176ec004ee1d8a4a Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 13:32:57 -0500
Subject: [PATCH 24/34] Update Sass Instructions

---
 docs/basic-features/built-in-css-support.md | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/docs/basic-features/built-in-css-support.md b/docs/basic-features/built-in-css-support.md
index 4b8f562df384a..62425b01e4919 100644
--- a/docs/basic-features/built-in-css-support.md
+++ b/docs/basic-features/built-in-css-support.md
@@ -159,10 +159,13 @@ Please see the [styled-jsx documentation](https://github.com/zeit/styled-jsx) fo
 
 ## Sass Support
 
-To enable importing global `.scss` or `.sass` within `pages/_app.js` and component-level CSS Modules with `.module.scss` or `.module.sass` install `node-sass` as a dependency to your project:
+Next.js allows you to import Sass using both the `.scss` and `.sass` extensions.
+You can use component-level Sass via CSS Modules and the `.module.scss` or `.module.sass` extension.
+
+Before you can use Next.js' built-in Sass support, be sure to install [`sass`](https://github.com/sass/sass):
 
 ```bash
-npm install node-sass
+npm install sass
 ```
 
 Sass support has the same benefits and restrictions as the built-in CSS support detailed above.

From 251d5f82dd77db8a69265d4587c76bb879559636 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 13:52:01 -0500
Subject: [PATCH 25/34] Remove unneeded fixtures

---
 .../.postcssrc.json                              |  3 ---
 .../bad-custom-configuration-arr-1/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../.postcssrc.json                              |  3 ---
 .../bad-custom-configuration-arr-2/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../.postcssrc.json                              |  3 ---
 .../bad-custom-configuration-arr-3/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../.postcssrc.json                              |  3 ---
 .../bad-custom-configuration-arr-4/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../.postcssrc.json                              |  3 ---
 .../bad-custom-configuration-arr-5/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../.postcssrc.json                              |  1 -
 .../bad-custom-configuration-arr-6/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../.postcssrc.json                              |  3 ---
 .../bad-custom-configuration-arr-7/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../bad-custom-configuration-arr-8/pages/_app.js | 12 ------------
 .../pages/index.js                               |  3 ---
 .../postcss.config.js                            |  3 ---
 .../styles/global.scss                           | 14 --------------
 .../bad-custom-configuration-func/pages/_app.js  | 12 ------------
 .../bad-custom-configuration-func/pages/index.js |  3 ---
 .../postcss.config.js                            |  3 ---
 .../styles/global.scss                           |  4 ----
 .../bad-custom-configuration/.postcssrc.json     | 13 -------------
 .../bad-custom-configuration/pages/_app.js       | 12 ------------
 .../bad-custom-configuration/pages/index.js      |  3 ---
 .../bad-custom-configuration/styles/global.scss  |  4 ----
 .../custom-configuration-arr/.postcssrc.json     | 16 ----------------
 .../custom-configuration-arr/pages/_app.js       | 12 ------------
 .../custom-configuration-arr/pages/index.js      |  3 ---
 .../custom-configuration-arr/styles/global.scss  | 14 --------------
 .../custom-configuration-legacy/next.config.js   | 15 ---------------
 .../custom-configuration-legacy/pages/_app.js    | 12 ------------
 .../custom-configuration-legacy/pages/index.js   |  3 ---
 .../postcss.config.js                            | 10 ----------
 .../styles/global.scss                           | 11 -----------
 .../custom-configuration/.postcssrc.json         | 11 -----------
 .../custom-configuration/pages/_app.js           | 12 ------------
 .../custom-configuration/pages/index.js          |  3 ---
 .../custom-configuration/styles/global.scss      | 11 -----------
 53 files changed, 441 deletions(-)
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-arr/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/next.config.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss
 delete mode 100644 test/integration/scss-fixtures/custom-configuration/.postcssrc.json
 delete mode 100644 test/integration/scss-fixtures/custom-configuration/pages/_app.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration/pages/index.js
 delete mode 100644 test/integration/scss-fixtures/custom-configuration/styles/global.scss

diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json
deleted file mode 100644
index ab27508fd95ca..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/.postcssrc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": [["postcss-trolling"]]
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-1/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json
deleted file mode 100644
index c6df57bdda0fa..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/.postcssrc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": [["postcss-trolling", null]]
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-2/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json
deleted file mode 100644
index e886576085efd..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/.postcssrc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": [[5, null]]
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-3/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json
deleted file mode 100644
index 05e159725dc23..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/.postcssrc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": [5]
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-4/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json
deleted file mode 100644
index 1e02e994a48d5..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/.postcssrc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": null
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-5/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json
deleted file mode 100644
index 0967ef424bce6..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/.postcssrc.json
+++ /dev/null
@@ -1 +0,0 @@
-{}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-6/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json
deleted file mode 100644
index 561d0cb76ddf9..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/.postcssrc.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "plugins": [["postcss-trolling", 5]]
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-7/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js
deleted file mode 100644
index 5f1f2140125eb..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/postcss.config.js
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = {
-  plugins: [require('postcss-trolling')],
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-arr-8/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-func/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-func/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js b/test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js
deleted file mode 100644
index 9bf5d079edf9b..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-func/postcss.config.js
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = function() {
-  return { plugins: [] }
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss
deleted file mode 100644
index e535e1983057d..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration-func/styles/global.scss
+++ /dev/null
@@ -1,4 +0,0 @@
-/* this should be transformed to width/height */
-.video {
-  max-size: 400px 300px;
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json b/test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json
deleted file mode 100644
index 8c058dc78d1e0..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration/.postcssrc.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "sourceMap": false,
-  "plugins": {
-    "postcss-modules-extract-imports": {},
-    "postcss-modules-local-by-default": {},
-    "postcss-modules-scope": {},
-    "postcss-modules-values": {},
-    "postcss-modules": {},
-
-    // Test a non-standard feature that wouldn't be normally enabled
-    "postcss-short-size": {}
-  }
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js b/test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/pages/index.js b/test/integration/scss-fixtures/bad-custom-configuration/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss b/test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss
deleted file mode 100644
index e535e1983057d..0000000000000
--- a/test/integration/scss-fixtures/bad-custom-configuration/styles/global.scss
+++ /dev/null
@@ -1,4 +0,0 @@
-/* this should be transformed to width/height */
-.video {
-  max-size: 400px 300px;
-}
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json b/test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json
deleted file mode 100644
index def6136b4cdc8..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-arr/.postcssrc.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  // Use comments to test JSON5 support
-  "plugins": [
-    "pixrem",
-    ["postcss-pseudoelements", true],
-    // Test a non-standard feature that wouldn't be normally enabled
-    [
-      "postcss-short-size",
-      {
-        // Add a prefix to test that configuration is passed
-        "prefix": "xyz"
-      }
-    ],
-    ["postcss-trolling", false]
-  ]
-}
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js b/test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-arr/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/pages/index.js b/test/integration/scss-fixtures/custom-configuration-arr/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-arr/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss b/test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss
deleted file mode 100644
index 78d27f7edd8e4..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-arr/styles/global.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  a::before {
-    content: '';
-  }
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400rem 300rem;
-}
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/next.config.js b/test/integration/scss-fixtures/custom-configuration-legacy/next.config.js
deleted file mode 100644
index 93bc6a48f6b17..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-legacy/next.config.js
+++ /dev/null
@@ -1,15 +0,0 @@
-const withCSS = require('@zeit/next-css')
-
-module.exports = withCSS({
-  onDemandEntries: {
-    // Make sure entries are not getting disposed.
-    maxInactiveAge: 1000 * 60 * 60,
-  },
-  experimental: {
-    css: true,
-  },
-  webpack(cfg) {
-    cfg.devtool = 'source-map'
-    return cfg
-  },
-})
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js b/test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-legacy/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js b/test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-legacy/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js b/test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js
deleted file mode 100644
index c7b7fde03c78c..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-legacy/postcss.config.js
+++ /dev/null
@@ -1,10 +0,0 @@
-module.exports = {
-  // Use comments to test JSON5 support
-  plugins: [
-    // Test a non-standard feature that wouldn't be normally enabled
-    require('postcss-short-size')({
-      // Add a prefix to test that configuration is passed
-      prefix: 'xyz',
-    }),
-  ],
-}
diff --git a/test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss b/test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss
deleted file mode 100644
index f942036ad16ef..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration-legacy/styles/global.scss
+++ /dev/null
@@ -1,11 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400px 300px;
-}
diff --git a/test/integration/scss-fixtures/custom-configuration/.postcssrc.json b/test/integration/scss-fixtures/custom-configuration/.postcssrc.json
deleted file mode 100644
index 21cd2f23012bd..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration/.postcssrc.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  // Use comments to test JSON5 support
-  "plugins": {
-    // Test a non-standard feature that wouldn't be normally enabled
-    "postcss-short-size": {
-      // Add a prefix to test that configuration is passed
-      "prefix": "xyz"
-    },
-    "postcss-trolling": false
-  }
-}
diff --git a/test/integration/scss-fixtures/custom-configuration/pages/_app.js b/test/integration/scss-fixtures/custom-configuration/pages/_app.js
deleted file mode 100644
index b89fe16feb731..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration/pages/_app.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import React from 'react'
-import App from 'next/app'
-import '../styles/global.scss'
-
-class MyApp extends App {
-  render() {
-    const { Component, pageProps } = this.props
-    return <Component {...pageProps} />
-  }
-}
-
-export default MyApp
diff --git a/test/integration/scss-fixtures/custom-configuration/pages/index.js b/test/integration/scss-fixtures/custom-configuration/pages/index.js
deleted file mode 100644
index b3ba78da2d5e1..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration/pages/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function Home() {
-  return <div />
-}
diff --git a/test/integration/scss-fixtures/custom-configuration/styles/global.scss b/test/integration/scss-fixtures/custom-configuration/styles/global.scss
deleted file mode 100644
index f942036ad16ef..0000000000000
--- a/test/integration/scss-fixtures/custom-configuration/styles/global.scss
+++ /dev/null
@@ -1,11 +0,0 @@
-/* this should pass through untransformed */
-@media (480px <= width < 768px) {
-  ::placeholder {
-    color: green;
-  }
-}
-
-/* this should be transformed to width/height */
-.video {
-  -xyz-max-size: 400px 300px;
-}

From c14c7f0dc41c5bf8206bfff724e4d4b79314beb5 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 14:03:52 -0500
Subject: [PATCH 26/34] Adjust global tests

---
 .../compilation-and-prefixing/styles/global.scss             | 5 +++--
 .../scss-fixtures/npm-import-bad/styles/global.scss          | 2 +-
 .../npm-import-nested/node_modules/example/test.scss         | 2 +-
 test/integration/scss-modules/test/index.test.js             | 3 +--
 test/integration/scss/test/index.test.js                     | 5 +----
 5 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss b/test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss
index 19e8290b4cd41..2cc5c559f728a 100644
--- a/test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss
+++ b/test/integration/scss-fixtures/compilation-and-prefixing/styles/global.scss
@@ -1,5 +1,6 @@
-@media (480px <= width < 768px) {
+$var: red;
+.redText {
   ::placeholder {
-    color: green;
+    color: $var;
   }
 }
diff --git a/test/integration/scss-fixtures/npm-import-bad/styles/global.scss b/test/integration/scss-fixtures/npm-import-bad/styles/global.scss
index 8e799fdddaeec..bc9b10bfd0877 100644
--- a/test/integration/scss-fixtures/npm-import-bad/styles/global.scss
+++ b/test/integration/scss-fixtures/npm-import-bad/styles/global.scss
@@ -1 +1 @@
-@import 'nprogress/nprogress.scss';
+@import 'nprogress/nprogress.css';
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
index 57ac6959e15d3..2d3c0c63b9749 100644
--- a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
@@ -1,4 +1,4 @@
-@import url('other.scss');
+@import 'other.scss';
 
 .test {
   color: red;
diff --git a/test/integration/scss-modules/test/index.test.js b/test/integration/scss-modules/test/index.test.js
index 5432b55a8f6ec..93e793260e399 100644
--- a/test/integration/scss-modules/test/index.test.js
+++ b/test/integration/scss-modules/test/index.test.js
@@ -19,7 +19,7 @@ jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 1
 const fixturesDir = join(__dirname, '../../scss-fixtures')
 
 describe('SCSS modules', () => {
-  describe('Basic CSS Module Support', () => {
+  describe('Basic SCSS Module Support', () => {
     const appDir = join(fixturesDir, 'basic-module')
 
     let appPort
@@ -181,7 +181,6 @@ describe('SCSS modules', () => {
     // FIXME: this is broken
     it('should update CSS color without remounting <input>', async () => {
       const browser = await webdriver(appPort, '/')
-      await waitFor(2000) // ensure application hydrates
 
       const desiredText = 'hello world'
       await browser.elementById('text-input').type(desiredText)
diff --git a/test/integration/scss/test/index.test.js b/test/integration/scss/test/index.test.js
index cf6ef28ce989f..7a2cbc971f0bc 100644
--- a/test/integration/scss/test/index.test.js
+++ b/test/integration/scss/test/index.test.js
@@ -143,7 +143,7 @@ describe('SCSS Support', () => {
       expect(
         cssContent.replace(/\/\*.*?\*\//g, '').trim()
       ).toMatchInlineSnapshot(
-        `"@media (min-width:480px) and (max-width:767px){::-webkit-input-placeholder{color:green}::-moz-placeholder{color:green}:-ms-input-placeholder{color:green}::-ms-input-placeholder{color:green}::placeholder{color:green}}"`
+        `".redText ::-webkit-input-placeholder{color:red}.redText ::-moz-placeholder{color:red}.redText :-ms-input-placeholder{color:red}.redText ::-ms-input-placeholder{color:red}.redText ::placeholder{color:red}"`
       )
 
       // Contains a source map
@@ -304,7 +304,6 @@ describe('SCSS Support', () => {
       let browser
       try {
         browser = await webdriver(appPort, '/page1')
-        await waitFor(2000) // ensure application hydrates
 
         const desiredText = 'hello world'
         await browser.elementById('text-input').type(desiredText)
@@ -703,7 +702,6 @@ describe('SCSS Support', () => {
 
     it('should have the correct color (css ordering)', async () => {
       const browser = await webdriver(appPort, '/')
-      await waitFor(2000) // ensure application hydrates
 
       const currentColor = await browser.eval(
         `window.getComputedStyle(document.querySelector('.my-text')).color`
@@ -729,7 +727,6 @@ describe('SCSS Support', () => {
 
     it('should have the correct color (css ordering)', async () => {
       const browser = await webdriver(appPort, '/')
-      await waitFor(2000) // ensure application hydrates
 
       const currentColor = await browser.eval(
         `window.getComputedStyle(document.querySelector('.my-text')).color`

From e5f3931ee3d137c566e243b48ab3fd5de0e4f66e Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 14:17:52 -0500
Subject: [PATCH 27/34] Remove wrapper

---
 .../scss-modules/test/index.test.js           | 576 +++++++++---------
 1 file changed, 280 insertions(+), 296 deletions(-)

diff --git a/test/integration/scss-modules/test/index.test.js b/test/integration/scss-modules/test/index.test.js
index 93e793260e399..d73f290d379f3 100644
--- a/test/integration/scss-modules/test/index.test.js
+++ b/test/integration/scss-modules/test/index.test.js
@@ -18,382 +18,366 @@ jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 1
 
 const fixturesDir = join(__dirname, '../../scss-fixtures')
 
-describe('SCSS modules', () => {
-  describe('Basic SCSS Module Support', () => {
-    const appDir = join(fixturesDir, 'basic-module')
-
-    let appPort
-    let app
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-      await nextBuild(appDir)
-      appPort = await findPort()
-      app = await nextStart(appDir, appPort)
-    })
-    afterAll(async () => {
-      await killApp(app)
-    })
+describe('Basic SCSS Module Support', () => {
+  const appDir = join(fixturesDir, 'basic-module')
+
+  let appPort
+  let app
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+    await nextBuild(appDir)
+    appPort = await findPort()
+    app = await nextStart(appDir, appPort)
+  })
+  afterAll(async () => {
+    await killApp(app)
+  })
 
-    it(`should've emitted a single CSS file`, async () => {
-      const cssFolder = join(appDir, '.next/static/css')
+  it(`should've emitted a single CSS file`, async () => {
+    const cssFolder = join(appDir, '.next/static/css')
 
-      const files = await readdir(cssFolder)
-      const cssFiles = files.filter(f => /\.css$/.test(f))
+    const files = await readdir(cssFolder)
+    const cssFiles = files.filter(f => /\.css$/.test(f))
 
-      expect(cssFiles.length).toBe(1)
-      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+    expect(cssFiles.length).toBe(1)
+    const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
-      expect(
-        cssContent.replace(/\/\*.*?\*\//g, '').trim()
-      ).toMatchInlineSnapshot(`".index_redText__2VIiM{color:red}"`)
-    })
+    expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
+      `".index_redText__2VIiM{color:red}"`
+    )
+  })
 
-    it(`should've injected the CSS on server render`, async () => {
-      const content = await renderViaHTTP(appPort, '/')
-      const $ = cheerio.load(content)
+  it(`should've injected the CSS on server render`, async () => {
+    const content = await renderViaHTTP(appPort, '/')
+    const $ = cheerio.load(content)
 
-      const cssPreload = $('link[rel="preload"][as="style"]')
-      expect(cssPreload.length).toBe(1)
-      expect(cssPreload.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+    const cssPreload = $('link[rel="preload"][as="style"]')
+    expect(cssPreload.length).toBe(1)
+    expect(cssPreload.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
 
-      const cssSheet = $('link[rel="stylesheet"]')
-      expect(cssSheet.length).toBe(1)
-      expect(cssSheet.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+    const cssSheet = $('link[rel="stylesheet"]')
+    expect(cssSheet.length).toBe(1)
+    expect(cssSheet.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
 
-      expect($('#verify-red').attr('class')).toMatchInlineSnapshot(
-        `"index_redText__2VIiM"`
-      )
-    })
+    expect($('#verify-red').attr('class')).toMatchInlineSnapshot(
+      `"index_redText__2VIiM"`
+    )
   })
+})
 
-  describe('3rd Party CSS Module Support', () => {
-    const appDir = join(fixturesDir, '3rd-party-module')
+describe('3rd Party CSS Module Support', () => {
+  const appDir = join(fixturesDir, '3rd-party-module')
 
-    let appPort
-    let app
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-      await nextBuild(appDir)
-      appPort = await findPort()
-      app = await nextStart(appDir, appPort)
-    })
-    afterAll(async () => {
-      await killApp(app)
-    })
+  let appPort
+  let app
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+    await nextBuild(appDir)
+    appPort = await findPort()
+    app = await nextStart(appDir, appPort)
+  })
+  afterAll(async () => {
+    await killApp(app)
+  })
 
-    it(`should've emitted a single CSS file`, async () => {
-      const cssFolder = join(appDir, '.next/static/css')
+  it(`should've emitted a single CSS file`, async () => {
+    const cssFolder = join(appDir, '.next/static/css')
 
-      const files = await readdir(cssFolder)
-      const cssFiles = files.filter(f => /\.css$/.test(f))
+    const files = await readdir(cssFolder)
+    const cssFiles = files.filter(f => /\.css$/.test(f))
 
-      expect(cssFiles.length).toBe(1)
-      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+    expect(cssFiles.length).toBe(1)
+    const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
-      expect(
-        cssContent.replace(/\/\*.*?\*\//g, '').trim()
-      ).toMatchInlineSnapshot(
-        `".index_foo__9_fxH{position:relative}.index_foo__9_fxH .bar,.index_foo__9_fxH .baz{height:100%;overflow:hidden}.index_foo__9_fxH .lol,.index_foo__9_fxH>.lel{width:80%}"`
-      )
-    })
+    expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
+      `".index_foo__9_fxH{position:relative}.index_foo__9_fxH .bar,.index_foo__9_fxH .baz{height:100%;overflow:hidden}.index_foo__9_fxH .lol,.index_foo__9_fxH>.lel{width:80%}"`
+    )
+  })
 
-    it(`should've injected the CSS on server render`, async () => {
-      const content = await renderViaHTTP(appPort, '/')
-      const $ = cheerio.load(content)
+  it(`should've injected the CSS on server render`, async () => {
+    const content = await renderViaHTTP(appPort, '/')
+    const $ = cheerio.load(content)
 
-      const cssPreload = $('link[rel="preload"][as="style"]')
-      expect(cssPreload.length).toBe(1)
-      expect(cssPreload.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+    const cssPreload = $('link[rel="preload"][as="style"]')
+    expect(cssPreload.length).toBe(1)
+    expect(cssPreload.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
 
-      const cssSheet = $('link[rel="stylesheet"]')
-      expect(cssSheet.length).toBe(1)
-      expect(cssSheet.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
+    const cssSheet = $('link[rel="stylesheet"]')
+    expect(cssSheet.length).toBe(1)
+    expect(cssSheet.attr('href')).toMatch(/^\/_next\/static\/css\/.*\.css$/)
 
-      expect($('#verify-div').attr('class')).toMatchInlineSnapshot(
-        `"index_foo__9_fxH"`
-      )
-    })
+    expect($('#verify-div').attr('class')).toMatchInlineSnapshot(
+      `"index_foo__9_fxH"`
+    )
   })
+})
 
-  describe('Has CSS Module in computed styles in Development', () => {
-    const appDir = join(fixturesDir, 'dev-module')
+describe('Has CSS Module in computed styles in Development', () => {
+  const appDir = join(fixturesDir, 'dev-module')
 
-    let appPort
-    let app
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-      appPort = await findPort()
-      app = await launchApp(appDir, appPort)
-    })
-    afterAll(async () => {
-      await killApp(app)
-    })
+  let appPort
+  let app
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+    appPort = await findPort()
+    app = await launchApp(appDir, appPort)
+  })
+  afterAll(async () => {
+    await killApp(app)
+  })
 
-    it('should have CSS for page', async () => {
-      const browser = await webdriver(appPort, '/')
+  it('should have CSS for page', async () => {
+    const browser = await webdriver(appPort, '/')
 
-      const currentColor = await browser.eval(
-        `window.getComputedStyle(document.querySelector('#verify-red')).color`
-      )
-      expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
-    })
+    const currentColor = await browser.eval(
+      `window.getComputedStyle(document.querySelector('#verify-red')).color`
+    )
+    expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
   })
+})
 
-  describe('Has CSS Module in computed styles in Production', () => {
-    const appDir = join(fixturesDir, 'prod-module')
+describe('Has CSS Module in computed styles in Production', () => {
+  const appDir = join(fixturesDir, 'prod-module')
 
-    let appPort
-    let app
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-      await nextBuild(appDir)
-      appPort = await findPort()
-      app = await nextStart(appDir, appPort)
-    })
-    afterAll(async () => {
-      await killApp(app)
-    })
+  let appPort
+  let app
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+    await nextBuild(appDir)
+    appPort = await findPort()
+    app = await nextStart(appDir, appPort)
+  })
+  afterAll(async () => {
+    await killApp(app)
+  })
 
-    it('should have CSS for page', async () => {
-      const browser = await webdriver(appPort, '/')
+  it('should have CSS for page', async () => {
+    const browser = await webdriver(appPort, '/')
 
-      const currentColor = await browser.eval(
-        `window.getComputedStyle(document.querySelector('#verify-red')).color`
-      )
-      expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
-    })
+    const currentColor = await browser.eval(
+      `window.getComputedStyle(document.querySelector('#verify-red')).color`
+    )
+    expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
   })
+})
 
-  xdescribe('Can hot reload CSS Module without losing state', () => {
-    const appDir = join(fixturesDir, 'hmr-module')
+xdescribe('Can hot reload CSS Module without losing state', () => {
+  const appDir = join(fixturesDir, 'hmr-module')
 
-    let appPort
-    let app
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-      appPort = await findPort()
-      app = await launchApp(appDir, appPort)
-    })
-    afterAll(async () => {
-      await killApp(app)
-    })
+  let appPort
+  let app
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+    appPort = await findPort()
+    app = await launchApp(appDir, appPort)
+  })
+  afterAll(async () => {
+    await killApp(app)
+  })
 
-    // FIXME: this is broken
-    it('should update CSS color without remounting <input>', async () => {
-      const browser = await webdriver(appPort, '/')
+  // FIXME: this is broken
+  it('should update CSS color without remounting <input>', async () => {
+    const browser = await webdriver(appPort, '/')
 
-      const desiredText = 'hello world'
-      await browser.elementById('text-input').type(desiredText)
-      expect(await browser.elementById('text-input').getValue()).toBe(
-        desiredText
-      )
+    const desiredText = 'hello world'
+    await browser.elementById('text-input').type(desiredText)
+    expect(await browser.elementById('text-input').getValue()).toBe(desiredText)
+
+    const currentColor = await browser.eval(
+      `window.getComputedStyle(document.querySelector('#verify-red')).color`
+    )
+    expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
+
+    const cssFile = new File(join(appDir, 'pages/index.module.scss'))
+    try {
+      cssFile.replace('color: red', 'color: purple')
+      await waitFor(2000) // wait for HMR
 
-      const currentColor = await browser.eval(
+      const refreshedColor = await browser.eval(
         `window.getComputedStyle(document.querySelector('#verify-red')).color`
       )
-      expect(currentColor).toMatchInlineSnapshot(`"rgb(255, 0, 0)"`)
-
-      const cssFile = new File(join(appDir, 'pages/index.module.scss'))
-      try {
-        cssFile.replace('color: red', 'color: purple')
-        await waitFor(2000) // wait for HMR
-
-        const refreshedColor = await browser.eval(
-          `window.getComputedStyle(document.querySelector('#verify-red')).color`
-        )
-        expect(refreshedColor).toMatchInlineSnapshot(`"rgb(128, 0, 128)"`)
-
-        // ensure text remained
-        expect(await browser.elementById('text-input').getValue()).toBe(
-          desiredText
-        )
-      } finally {
-        cssFile.restore()
-      }
-    })
+      expect(refreshedColor).toMatchInlineSnapshot(`"rgb(128, 0, 128)"`)
+
+      // ensure text remained
+      expect(await browser.elementById('text-input').getValue()).toBe(
+        desiredText
+      )
+    } finally {
+      cssFile.restore()
+    }
   })
+})
 
-  describe('Invalid CSS Module Usage in node_modules', () => {
-    const appDir = join(fixturesDir, 'invalid-module')
+describe('Invalid CSS Module Usage in node_modules', () => {
+  const appDir = join(fixturesDir, 'invalid-module')
 
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-    })
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+  })
 
-    it('should fail to build', async () => {
-      const { stderr } = await nextBuild(appDir, [], {
-        stderr: true,
-      })
-      expect(stderr).toContain('Failed to compile')
-      expect(stderr).toContain('node_modules/example/index.module.scss')
-      expect(stderr).toMatch(
-        /CSS Modules.*cannot.*be imported from within.*node_modules/
-      )
-      expect(stderr).toMatch(
-        /Location:.*node_modules[\\/]example[\\/]index\.mjs/
-      )
+  it('should fail to build', async () => {
+    const { stderr } = await nextBuild(appDir, [], {
+      stderr: true,
     })
+    expect(stderr).toContain('Failed to compile')
+    expect(stderr).toContain('node_modules/example/index.module.scss')
+    expect(stderr).toMatch(
+      /CSS Modules.*cannot.*be imported from within.*node_modules/
+    )
+    expect(stderr).toMatch(/Location:.*node_modules[\\/]example[\\/]index\.mjs/)
   })
+})
 
-  describe('Invalid CSS Module Usage in node_modules', () => {
-    const appDir = join(fixturesDir, 'invalid-global-module')
+describe('Invalid CSS Module Usage in node_modules', () => {
+  const appDir = join(fixturesDir, 'invalid-global-module')
 
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-    })
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+  })
 
-    it('should fail to build', async () => {
-      const { stderr } = await nextBuild(appDir, [], {
-        stderr: true,
-      })
-      expect(stderr).toContain('Failed to compile')
-      expect(stderr).toContain('node_modules/example/index.scss')
-      expect(stderr).toMatch(
-        /Global CSS.*cannot.*be imported from within.*node_modules/
-      )
-      expect(stderr).toMatch(
-        /Location:.*node_modules[\\/]example[\\/]index\.mjs/
-      )
+  it('should fail to build', async () => {
+    const { stderr } = await nextBuild(appDir, [], {
+      stderr: true,
     })
+    expect(stderr).toContain('Failed to compile')
+    expect(stderr).toContain('node_modules/example/index.scss')
+    expect(stderr).toMatch(
+      /Global CSS.*cannot.*be imported from within.*node_modules/
+    )
+    expect(stderr).toMatch(/Location:.*node_modules[\\/]example[\\/]index\.mjs/)
   })
+})
 
-  describe('Valid CSS Module Usage from within node_modules', () => {
-    const appDir = join(fixturesDir, 'nm-module')
+describe('Valid CSS Module Usage from within node_modules', () => {
+  const appDir = join(fixturesDir, 'nm-module')
 
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-    })
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+  })
 
-    let appPort
-    let app
-    beforeAll(async () => {
-      await nextBuild(appDir)
-      appPort = await findPort()
-      app = await nextStart(appDir, appPort)
-    })
-    afterAll(async () => {
-      await killApp(app)
-    })
+  let appPort
+  let app
+  beforeAll(async () => {
+    await nextBuild(appDir)
+    appPort = await findPort()
+    app = await nextStart(appDir, appPort)
+  })
+  afterAll(async () => {
+    await killApp(app)
+  })
 
-    it(`should've prerendered with relevant data`, async () => {
-      const content = await renderViaHTTP(appPort, '/')
-      const $ = cheerio.load(content)
+  it(`should've prerendered with relevant data`, async () => {
+    const content = await renderViaHTTP(appPort, '/')
+    const $ = cheerio.load(content)
 
-      const cssPreload = $('#nm-div')
-      expect(cssPreload.text()).toMatchInlineSnapshot(
-        `"{\\"message\\":\\"Why hello there\\"} {\\"redText\\":\\"example_redText__1hNNA\\"}"`
-      )
-    })
+    const cssPreload = $('#nm-div')
+    expect(cssPreload.text()).toMatchInlineSnapshot(
+      `"{\\"message\\":\\"Why hello there\\"} {\\"redText\\":\\"example_redText__1hNNA\\"}"`
+    )
+  })
 
-    it(`should've emitted a single CSS file`, async () => {
-      const cssFolder = join(appDir, '.next/static/css')
+  it(`should've emitted a single CSS file`, async () => {
+    const cssFolder = join(appDir, '.next/static/css')
 
-      const files = await readdir(cssFolder)
-      const cssFiles = files.filter(f => /\.css$/.test(f))
+    const files = await readdir(cssFolder)
+    const cssFiles = files.filter(f => /\.css$/.test(f))
 
-      expect(cssFiles.length).toBe(1)
-      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+    expect(cssFiles.length).toBe(1)
+    const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
-      expect(
-        cssContent.replace(/\/\*.*?\*\//g, '').trim()
-      ).toMatchInlineSnapshot(`".example_redText__1hNNA{color:\\"red\\"}"`)
-    })
+    expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
+      `".example_redText__1hNNA{color:\\"red\\"}"`
+    )
   })
+})
 
-  describe('Valid Nested CSS Module Usage from within node_modules', () => {
-    const appDir = join(fixturesDir, 'nm-module-nested')
+describe('Valid Nested CSS Module Usage from within node_modules', () => {
+  const appDir = join(fixturesDir, 'nm-module-nested')
 
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-    })
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+  })
 
-    let appPort
-    let app
-    beforeAll(async () => {
-      await nextBuild(appDir)
-      appPort = await findPort()
-      app = await nextStart(appDir, appPort)
-    })
-    afterAll(async () => {
-      await killApp(app)
-    })
+  let appPort
+  let app
+  beforeAll(async () => {
+    await nextBuild(appDir)
+    appPort = await findPort()
+    app = await nextStart(appDir, appPort)
+  })
+  afterAll(async () => {
+    await killApp(app)
+  })
 
-    it(`should've prerendered with relevant data`, async () => {
-      const content = await renderViaHTTP(appPort, '/')
-      const $ = cheerio.load(content)
+  it(`should've prerendered with relevant data`, async () => {
+    const content = await renderViaHTTP(appPort, '/')
+    const $ = cheerio.load(content)
 
-      const cssPreload = $('#nm-div')
-      expect(cssPreload.text()).toMatchInlineSnapshot(
-        `"{\\"message\\":\\"Why hello there\\"} {\\"other2\\":\\"example_other2__1pnJV\\",\\"subClass\\":\\"example_subClass__2EbKX other_className__E6nd8\\"}"`
-      )
-    })
+    const cssPreload = $('#nm-div')
+    expect(cssPreload.text()).toMatchInlineSnapshot(
+      `"{\\"message\\":\\"Why hello there\\"} {\\"other2\\":\\"example_other2__1pnJV\\",\\"subClass\\":\\"example_subClass__2EbKX other_className__E6nd8\\"}"`
+    )
+  })
 
-    it(`should've emitted a single CSS file`, async () => {
-      const cssFolder = join(appDir, '.next/static/css')
+  it(`should've emitted a single CSS file`, async () => {
+    const cssFolder = join(appDir, '.next/static/css')
 
-      const files = await readdir(cssFolder)
-      const cssFiles = files.filter(f => /\.css$/.test(f))
+    const files = await readdir(cssFolder)
+    const cssFiles = files.filter(f => /\.css$/.test(f))
 
-      expect(cssFiles.length).toBe(1)
-      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+    expect(cssFiles.length).toBe(1)
+    const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
-      expect(
-        cssContent.replace(/\/\*.*?\*\//g, '').trim()
-      ).toMatchInlineSnapshot(
-        `".other_other3__ZPN-Y{color:violet}.other_className__E6nd8{background:red;color:#ff0}.example_other2__1pnJV{color:red}.example_subClass__2EbKX{background:#00f}"`
-      )
-    })
+    expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
+      `".other_other3__ZPN-Y{color:violet}.other_className__E6nd8{background:red;color:#ff0}.example_other2__1pnJV{color:red}.example_subClass__2EbKX{background:#00f}"`
+    )
   })
+})
 
-  describe('CSS Module Composes Usage (Basic)', () => {
-    // This is a very bad feature. Do not use it.
-    const appDir = join(fixturesDir, 'composes-basic')
+describe('CSS Module Composes Usage (Basic)', () => {
+  // This is a very bad feature. Do not use it.
+  const appDir = join(fixturesDir, 'composes-basic')
 
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-      await nextBuild(appDir)
-    })
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+    await nextBuild(appDir)
+  })
 
-    it(`should've emitted a single CSS file`, async () => {
-      const cssFolder = join(appDir, '.next/static/css')
+  it(`should've emitted a single CSS file`, async () => {
+    const cssFolder = join(appDir, '.next/static/css')
 
-      const files = await readdir(cssFolder)
-      const cssFiles = files.filter(f => /\.css$/.test(f))
+    const files = await readdir(cssFolder)
+    const cssFiles = files.filter(f => /\.css$/.test(f))
 
-      expect(cssFiles.length).toBe(1)
-      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+    expect(cssFiles.length).toBe(1)
+    const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
-      expect(
-        cssContent.replace(/\/\*.*?\*\//g, '').trim()
-      ).toMatchInlineSnapshot(
-        `".index_className__2O8Wt{background:red;color:#ff0}.index_subClass__3e6Re{background:#00f}"`
-      )
-    })
+    expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
+      `".index_className__2O8Wt{background:red;color:#ff0}.index_subClass__3e6Re{background:#00f}"`
+    )
   })
+})
 
-  describe('CSS Module Composes Usage (External)', () => {
-    // This is a very bad feature. Do not use it.
-    const appDir = join(fixturesDir, 'composes-external')
+describe('CSS Module Composes Usage (External)', () => {
+  // This is a very bad feature. Do not use it.
+  const appDir = join(fixturesDir, 'composes-external')
 
-    beforeAll(async () => {
-      await remove(join(appDir, '.next'))
-      await nextBuild(appDir)
-    })
+  beforeAll(async () => {
+    await remove(join(appDir, '.next'))
+    await nextBuild(appDir)
+  })
 
-    it(`should've emitted a single CSS file`, async () => {
-      const cssFolder = join(appDir, '.next/static/css')
+  it(`should've emitted a single CSS file`, async () => {
+    const cssFolder = join(appDir, '.next/static/css')
 
-      const files = await readdir(cssFolder)
-      const cssFiles = files.filter(f => /\.css$/.test(f))
+    const files = await readdir(cssFolder)
+    const cssFiles = files.filter(f => /\.css$/.test(f))
 
-      expect(cssFiles.length).toBe(1)
-      const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
+    expect(cssFiles.length).toBe(1)
+    const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
-      expect(
-        cssContent.replace(/\/\*.*?\*\//g, '').trim()
-      ).toMatchInlineSnapshot(
-        `".other_className__2VTl4{background:red;color:#ff0}.index_subClass__3e6Re{background:#00f}"`
-      )
-    })
+    expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
+      `".other_className__2VTl4{background:red;color:#ff0}.index_subClass__3e6Re{background:#00f}"`
+    )
   })
 })

From 6196d9acb90a53f23f6cb422ea2655001a33357f Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 14:34:36 -0500
Subject: [PATCH 28/34] Update source maps

---
 test/integration/scss/test/index.test.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/test/integration/scss/test/index.test.js b/test/integration/scss/test/index.test.js
index 7a2cbc971f0bc..7696ca5648d1b 100644
--- a/test/integration/scss/test/index.test.js
+++ b/test/integration/scss/test/index.test.js
@@ -164,11 +164,12 @@ describe('SCSS Support', () => {
       const { version, mappings, sourcesContent } = JSON.parse(cssMapContent)
       expect({ version, mappings, sourcesContent }).toMatchInlineSnapshot(`
         Object {
-          "mappings": "AAAA,+CACE,4BACE,WACF,CAFA,mBACE,WACF,CAFA,uBACE,WACF,CAFA,wBACE,WACF,CAFA,cACE,WACF,CACF",
+          "mappings": "AACA,qCAEI,SAHK,CACT,4BAEI,SAHK,CACT,gCAEI,SAHK,CACT,iCAEI,SAHK,CACT,uBAEI,SAHK",
           "sourcesContent": Array [
-            "@media (480px <= width < 768px) {
+            "$var: red;
+        .redText {
           ::placeholder {
-            color: green;
+            color: $var;
           }
         }
         ",

From 34500ace1bd4bec0319bb10ca93a3907e771f217 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 14:41:29 -0500
Subject: [PATCH 29/34] Flag scss behavior

---
 packages/next/build/webpack-config.ts         |  1 +
 .../build/webpack/config/blocks/css/index.ts  | 92 ++++++++++++-------
 packages/next/build/webpack/config/index.ts   |  4 +-
 packages/next/next-server/server/config.ts    |  1 +
 4 files changed, 65 insertions(+), 33 deletions(-)

diff --git a/packages/next/build/webpack-config.ts b/packages/next/build/webpack-config.ts
index 777213d13dc68..ab38642e45bf4 100644
--- a/packages/next/build/webpack-config.ts
+++ b/packages/next/build/webpack-config.ts
@@ -834,6 +834,7 @@ export default async function getBaseWebpackConfig(
     isDevelopment: dev,
     isServer,
     hasSupportCss: !!config.experimental.css,
+    hasSupportScss: !!config.experimental.scss,
     assetPrefix: config.assetPrefix || '',
   })
 
diff --git a/packages/next/build/webpack/config/blocks/css/index.ts b/packages/next/build/webpack/config/blocks/css/index.ts
index aa866c1d71b6d..0ba6ec7051db3 100644
--- a/packages/next/build/webpack/config/blocks/css/index.ts
+++ b/packages/next/build/webpack/config/blocks/css/index.ts
@@ -26,6 +26,7 @@ const regexSassModules = /\.module\.(scss|sass)$/
 
 export const css = curry(async function css(
   enabled: boolean,
+  scssEnabled: boolean,
   ctx: ConfigurationContext,
   config: Configuration
 ) {
@@ -123,34 +124,44 @@ export const css = curry(async function css(
           },
           use: getCssModuleLoader(ctx, postCssPlugins),
         },
-
-        // Opt-in support for Sass (using .scss or .sass extensions).
-        {
-          // Sass Modules should never have side effects. This setting will
-          // allow unused Sass to be removed from the production build.
-          // We ensure this by disallowing `:global()` Sass at the top-level
-          // via the `pure` mode in `css-loader`.
-          sideEffects: false,
-          // Sass Modules are activated via this specific extension.
-          test: regexSassModules,
-          // Sass Modules are only supported in the user's application. We're
-          // not yet allowing Sass imports _within_ `node_modules`.
-          issuer: {
-            include: [ctx.rootDirectory],
-            exclude: /node_modules/,
-          },
-          use: getCssModuleLoader(ctx, postCssPlugins, sassPreprocessors),
-        },
       ],
     })
   )
+  if (scssEnabled) {
+    fns.push(
+      loader({
+        oneOf: [
+          // Opt-in support for Sass (using .scss or .sass extensions).
+          {
+            // Sass Modules should never have side effects. This setting will
+            // allow unused Sass to be removed from the production build.
+            // We ensure this by disallowing `:global()` Sass at the top-level
+            // via the `pure` mode in `css-loader`.
+            sideEffects: false,
+            // Sass Modules are activated via this specific extension.
+            test: regexSassModules,
+            // Sass Modules are only supported in the user's application. We're
+            // not yet allowing Sass imports _within_ `node_modules`.
+            issuer: {
+              include: [ctx.rootDirectory],
+              exclude: /node_modules/,
+            },
+            use: getCssModuleLoader(ctx, postCssPlugins, sassPreprocessors),
+          },
+        ],
+      })
+    )
+  }
 
   // Throw an error for CSS Modules used outside their supported scope
   fns.push(
     loader({
       oneOf: [
         {
-          test: [regexCssModules, regexSassModules],
+          test: [
+            regexCssModules,
+            (scssEnabled && regexSassModules) as RegExp,
+          ].filter(Boolean),
           use: {
             loader: 'error-loader',
             options: {
@@ -167,7 +178,10 @@ export const css = curry(async function css(
       loader({
         oneOf: [
           {
-            test: [regexCssGlobal, regexSassGlobal],
+            test: [
+              regexCssGlobal,
+              (scssEnabled && regexSassGlobal) as RegExp,
+            ].filter(Boolean),
             use: require.resolve('ignore-loader'),
           },
         ],
@@ -187,19 +201,27 @@ export const css = curry(async function css(
             issuer: { include: ctx.customAppFile },
             use: getGlobalCssLoader(ctx, postCssPlugins),
           },
-          {
-            // A global Sass import always has side effects. Webpack will tree
-            // shake the Sass without this option if the issuer claims to have
-            // no side-effects.
-            // See https://github.com/webpack/webpack/issues/6571
-            sideEffects: true,
-            test: regexSassGlobal,
-            issuer: { include: ctx.customAppFile },
-            use: getGlobalCssLoader(ctx, postCssPlugins, sassPreprocessors),
-          },
         ],
       })
     )
+    if (scssEnabled) {
+      fns.push(
+        loader({
+          oneOf: [
+            {
+              // A global Sass import always has side effects. Webpack will tree
+              // shake the Sass without this option if the issuer claims to have
+              // no side-effects.
+              // See https://github.com/webpack/webpack/issues/6571
+              sideEffects: true,
+              test: regexSassGlobal,
+              issuer: { include: ctx.customAppFile },
+              use: getGlobalCssLoader(ctx, postCssPlugins, sassPreprocessors),
+            },
+          ],
+        })
+      )
+    }
   }
 
   // Throw an error for Global CSS used inside of `node_modules`
@@ -207,7 +229,10 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: [regexCssGlobal, regexSassGlobal],
+          test: [
+            regexCssGlobal,
+            (scssEnabled && regexSassGlobal) as RegExp,
+          ].filter(Boolean),
           issuer: { include: [/node_modules/] },
           use: {
             loader: 'error-loader',
@@ -225,7 +250,10 @@ export const css = curry(async function css(
     loader({
       oneOf: [
         {
-          test: [regexCssGlobal, regexSassGlobal],
+          test: [
+            regexCssGlobal,
+            (scssEnabled && regexSassGlobal) as RegExp,
+          ].filter(Boolean),
           use: {
             loader: 'error-loader',
             options: {
diff --git a/packages/next/build/webpack/config/index.ts b/packages/next/build/webpack/config/index.ts
index 3d60123601e49..8df1fffe08efa 100644
--- a/packages/next/build/webpack/config/index.ts
+++ b/packages/next/build/webpack/config/index.ts
@@ -11,6 +11,7 @@ export async function build(
     isDevelopment,
     isServer,
     hasSupportCss,
+    hasSupportScss,
     assetPrefix,
   }: {
     rootDirectory: string
@@ -18,6 +19,7 @@ export async function build(
     isDevelopment: boolean
     isServer: boolean
     hasSupportCss: boolean
+    hasSupportScss: boolean
     assetPrefix: string
   }
 ): Promise<webpack.Configuration> {
@@ -35,6 +37,6 @@ export async function build(
       : '',
   }
 
-  const fn = pipe(base(ctx), css(hasSupportCss, ctx))
+  const fn = pipe(base(ctx), css(hasSupportCss, hasSupportScss, ctx))
   return fn(config)
 }
diff --git a/packages/next/next-server/server/config.ts b/packages/next/next-server/server/config.ts
index 57a50d0df8b0b..564742f40bf6c 100644
--- a/packages/next/next-server/server/config.ts
+++ b/packages/next/next-server/server/config.ts
@@ -42,6 +42,7 @@ const defaultConfig: { [key: string]: any } = {
         (os.cpus() || { length: 1 }).length) - 1
     ),
     css: true,
+    scss: false,
     documentMiddleware: false,
     granularChunks: true,
     modern: false,

From 703b7adaa61eb8db90a1171785c1ce118390027a Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Wed, 22 Jan 2020 12:11:02 -0700
Subject: [PATCH 30/34] Fix css property value

---
 .../nm-module/node_modules/example/index.module.css             | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/integration/css-fixtures/nm-module/node_modules/example/index.module.css b/test/integration/css-fixtures/nm-module/node_modules/example/index.module.css
index f77fe0ef0bdbe..08a38e09ef8ea 100644
--- a/test/integration/css-fixtures/nm-module/node_modules/example/index.module.css
+++ b/test/integration/css-fixtures/nm-module/node_modules/example/index.module.css
@@ -1,3 +1,3 @@
 .redText {
-  color: 'red';
+  color: red;
 }

From cf6834f8d1fe0e4b27de6c9355b785c47b198043 Mon Sep 17 00:00:00 2001
From: alejalapeno <alexander@dreith.com>
Date: Wed, 22 Jan 2020 12:21:58 -0700
Subject: [PATCH 31/34] Update fixtures with Sass vars

---
 .../scss-fixtures/basic-module/pages/index.module.scss         | 3 ++-
 .../scss-fixtures/composes-basic/pages/index.module.scss       | 3 ++-
 .../scss-fixtures/composes-external/pages/index.module.scss    | 3 ++-
 .../scss-fixtures/composes-external/pages/other.scss           | 3 ++-
 .../scss-fixtures/dev-module/pages/index.module.scss           | 3 ++-
 .../scss-fixtures/hmr-module/pages/index.module.scss           | 3 ++-
 .../scss-fixtures/multi-global-reversed/styles/global1.scss    | 3 ++-
 .../scss-fixtures/multi-global-reversed/styles/global2.scss    | 3 ++-
 .../integration/scss-fixtures/multi-global/styles/global1.scss | 3 ++-
 .../integration/scss-fixtures/multi-global/styles/global2.scss | 3 ++-
 .../scss-fixtures/multi-module/pages/blue.module.scss          | 3 ++-
 .../scss-fixtures/multi-module/pages/red.module.scss           | 3 ++-
 test/integration/scss-fixtures/multi-page/styles/global1.scss  | 3 ++-
 test/integration/scss-fixtures/multi-page/styles/global2.scss  | 3 ++-
 .../scss-fixtures/nested-global/styles/global1.scss            | 3 ++-
 .../scss-fixtures/nested-global/styles/global1b.scss           | 3 ++-
 .../scss-fixtures/nested-global/styles/global2.scss            | 3 ++-
 .../scss-fixtures/nested-global/styles/global2b.scss           | 3 ++-
 .../nm-module-nested/node_modules/example/index.module.scss    | 3 ++-
 .../nm-module-nested/node_modules/example/other.scss           | 3 ++-
 .../nm-module-nested/node_modules/example/other2.scss          | 3 ++-
 .../nm-module-nested/node_modules/example/other3.scss          | 3 ++-
 .../nm-module/node_modules/example/index.module.scss           | 3 ++-
 .../npm-import-nested/node_modules/example/other.scss          | 3 ++-
 .../npm-import-nested/node_modules/example/test.scss           | 3 ++-
 .../scss-fixtures/prod-module/pages/index.module.scss          | 3 ++-
 .../scss-fixtures/single-global-src/styles/global.scss         | 3 ++-
 .../integration/scss-fixtures/single-global/styles/global.scss | 3 ++-
 .../url-global-asset-prefix-1/styles/global1.scss              | 3 ++-
 .../url-global-asset-prefix-1/styles/global2.scss              | 3 ++-
 .../url-global-asset-prefix-1/styles/global2b.scss             | 3 ++-
 .../url-global-asset-prefix-2/styles/global1.scss              | 3 ++-
 .../url-global-asset-prefix-2/styles/global2.scss              | 3 ++-
 .../url-global-asset-prefix-2/styles/global2b.scss             | 3 ++-
 test/integration/scss-fixtures/url-global/styles/global1.scss  | 3 ++-
 test/integration/scss-fixtures/url-global/styles/global2.scss  | 3 ++-
 test/integration/scss-fixtures/url-global/styles/global2b.scss | 3 ++-
 .../scss-fixtures/valid-and-invalid-global/styles/global.scss  | 3 ++-
 .../scss-fixtures/with-styled-jsx/styles/global.scss           | 3 ++-
 39 files changed, 78 insertions(+), 39 deletions(-)

diff --git a/test/integration/scss-fixtures/basic-module/pages/index.module.scss b/test/integration/scss-fixtures/basic-module/pages/index.module.scss
index 08a38e09ef8ea..eb8bb05c73aca 100644
--- a/test/integration/scss-fixtures/basic-module/pages/index.module.scss
+++ b/test/integration/scss-fixtures/basic-module/pages/index.module.scss
@@ -1,3 +1,4 @@
+$var: red;
 .redText {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/composes-basic/pages/index.module.scss b/test/integration/scss-fixtures/composes-basic/pages/index.module.scss
index 0999b553172d8..e3c6430bd6f70 100644
--- a/test/integration/scss-fixtures/composes-basic/pages/index.module.scss
+++ b/test/integration/scss-fixtures/composes-basic/pages/index.module.scss
@@ -1,5 +1,6 @@
+$var: red;
 .className {
-  background: red;
+  background: $var;
   color: yellow;
 }
 
diff --git a/test/integration/scss-fixtures/composes-external/pages/index.module.scss b/test/integration/scss-fixtures/composes-external/pages/index.module.scss
index 373385ec2f693..196db5d888917 100644
--- a/test/integration/scss-fixtures/composes-external/pages/index.module.scss
+++ b/test/integration/scss-fixtures/composes-external/pages/index.module.scss
@@ -1,4 +1,5 @@
+$var: blue;
 .subClass {
   composes: className from './other.scss';
-  background: blue;
+  background: $var;
 }
diff --git a/test/integration/scss-fixtures/composes-external/pages/other.scss b/test/integration/scss-fixtures/composes-external/pages/other.scss
index 6c6bc72eae403..382dd3097baa0 100644
--- a/test/integration/scss-fixtures/composes-external/pages/other.scss
+++ b/test/integration/scss-fixtures/composes-external/pages/other.scss
@@ -1,4 +1,5 @@
+$var: red;
 .className {
-  background: red;
+  background: $var;
   color: yellow;
 }
diff --git a/test/integration/scss-fixtures/dev-module/pages/index.module.scss b/test/integration/scss-fixtures/dev-module/pages/index.module.scss
index 08a38e09ef8ea..eb8bb05c73aca 100644
--- a/test/integration/scss-fixtures/dev-module/pages/index.module.scss
+++ b/test/integration/scss-fixtures/dev-module/pages/index.module.scss
@@ -1,3 +1,4 @@
+$var: red;
 .redText {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/hmr-module/pages/index.module.scss b/test/integration/scss-fixtures/hmr-module/pages/index.module.scss
index 08a38e09ef8ea..eb8bb05c73aca 100644
--- a/test/integration/scss-fixtures/hmr-module/pages/index.module.scss
+++ b/test/integration/scss-fixtures/hmr-module/pages/index.module.scss
@@ -1,3 +1,4 @@
+$var: red;
 .redText {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss b/test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss
index 8e1524022baf8..da7b3d1417b1b 100644
--- a/test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss
+++ b/test/integration/scss-fixtures/multi-global-reversed/styles/global1.scss
@@ -1,3 +1,4 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss b/test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss
index 9d1af6c0f6db1..3dd5eeaf6db92 100644
--- a/test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss
+++ b/test/integration/scss-fixtures/multi-global-reversed/styles/global2.scss
@@ -1,3 +1,4 @@
+$var: blue;
 .blue-text {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-global/styles/global1.scss b/test/integration/scss-fixtures/multi-global/styles/global1.scss
index 8e1524022baf8..da7b3d1417b1b 100644
--- a/test/integration/scss-fixtures/multi-global/styles/global1.scss
+++ b/test/integration/scss-fixtures/multi-global/styles/global1.scss
@@ -1,3 +1,4 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-global/styles/global2.scss b/test/integration/scss-fixtures/multi-global/styles/global2.scss
index 9d1af6c0f6db1..3dd5eeaf6db92 100644
--- a/test/integration/scss-fixtures/multi-global/styles/global2.scss
+++ b/test/integration/scss-fixtures/multi-global/styles/global2.scss
@@ -1,3 +1,4 @@
+$var: blue;
 .blue-text {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-module/pages/blue.module.scss b/test/integration/scss-fixtures/multi-module/pages/blue.module.scss
index 4c5ac28ce4ef8..a227734ba1db1 100644
--- a/test/integration/scss-fixtures/multi-module/pages/blue.module.scss
+++ b/test/integration/scss-fixtures/multi-module/pages/blue.module.scss
@@ -1,3 +1,4 @@
+$var: blue;
 .blueText {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-module/pages/red.module.scss b/test/integration/scss-fixtures/multi-module/pages/red.module.scss
index 08a38e09ef8ea..eb8bb05c73aca 100644
--- a/test/integration/scss-fixtures/multi-module/pages/red.module.scss
+++ b/test/integration/scss-fixtures/multi-module/pages/red.module.scss
@@ -1,3 +1,4 @@
+$var: red;
 .redText {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-page/styles/global1.scss b/test/integration/scss-fixtures/multi-page/styles/global1.scss
index 8e1524022baf8..da7b3d1417b1b 100644
--- a/test/integration/scss-fixtures/multi-page/styles/global1.scss
+++ b/test/integration/scss-fixtures/multi-page/styles/global1.scss
@@ -1,3 +1,4 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/multi-page/styles/global2.scss b/test/integration/scss-fixtures/multi-page/styles/global2.scss
index 9d1af6c0f6db1..3dd5eeaf6db92 100644
--- a/test/integration/scss-fixtures/multi-page/styles/global2.scss
+++ b/test/integration/scss-fixtures/multi-page/styles/global2.scss
@@ -1,3 +1,4 @@
+$var: blue;
 .blue-text {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/nested-global/styles/global1.scss b/test/integration/scss-fixtures/nested-global/styles/global1.scss
index c6abef272702d..096036b10f2dd 100644
--- a/test/integration/scss-fixtures/nested-global/styles/global1.scss
+++ b/test/integration/scss-fixtures/nested-global/styles/global1.scss
@@ -1,5 +1,6 @@
 @import './global1b.scss';
 
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/nested-global/styles/global1b.scss b/test/integration/scss-fixtures/nested-global/styles/global1b.scss
index 3902bc9032e31..e288c3ca0d12e 100644
--- a/test/integration/scss-fixtures/nested-global/styles/global1b.scss
+++ b/test/integration/scss-fixtures/nested-global/styles/global1b.scss
@@ -1,4 +1,5 @@
+$var: purple;
 .red-text {
-  color: purple;
+  color: $var;
   font-weight: bolder;
 }
diff --git a/test/integration/scss-fixtures/nested-global/styles/global2.scss b/test/integration/scss-fixtures/nested-global/styles/global2.scss
index 37e7107172397..4b659d369c561 100644
--- a/test/integration/scss-fixtures/nested-global/styles/global2.scss
+++ b/test/integration/scss-fixtures/nested-global/styles/global2.scss
@@ -1,5 +1,6 @@
 @import './global2b.scss';
 
+$var: blue;
 .blue-text {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/nested-global/styles/global2b.scss b/test/integration/scss-fixtures/nested-global/styles/global2b.scss
index 56bea0235b8ac..cc1554c3c8334 100644
--- a/test/integration/scss-fixtures/nested-global/styles/global2b.scss
+++ b/test/integration/scss-fixtures/nested-global/styles/global2b.scss
@@ -1,4 +1,5 @@
+$var: orange;
 .blue-text {
-  color: orange;
+  color: $var;
   font-weight: bolder;
 }
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
index aed5852ba6873..d2d4babe01664 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/index.module.scss
@@ -1,6 +1,7 @@
 @import 'other2.scss';
 
+$var: blue;
 .subClass {
   composes: className from './other.scss';
-  background: blue;
+  background: $var;
 }
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
index d8eb83346a6ea..eb0f82f7aacb4 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other.scss
@@ -1,6 +1,7 @@
 @import 'other3.scss';
 
+$var: red;
 .className {
-  background: red;
+  background: $var;
   color: yellow;
 }
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
index 3edf8b085d62b..7525334516ec4 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other2.scss
@@ -1,3 +1,4 @@
+$var: red;
 .other2 {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
index 3bff2788064f9..ecbdacff019d8 100644
--- a/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
+++ b/test/integration/scss-fixtures/nm-module-nested/node_modules/example/other3.scss
@@ -1,3 +1,4 @@
+$var: violet;
 .other3 {
-  color: violet;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss b/test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss
index f77fe0ef0bdbe..eb8bb05c73aca 100644
--- a/test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss
+++ b/test/integration/scss-fixtures/nm-module/node_modules/example/index.module.scss
@@ -1,3 +1,4 @@
+$var: red;
 .redText {
-  color: 'red';
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss
index eefdaa510cfa8..b2a7622386198 100644
--- a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/other.scss
@@ -1,3 +1,4 @@
+$var: blue;
 .other {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
index 2d3c0c63b9749..2db9b0627d1ef 100644
--- a/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
+++ b/test/integration/scss-fixtures/npm-import-nested/node_modules/example/test.scss
@@ -1,5 +1,6 @@
 @import 'other.scss';
 
+$var: red;
 .test {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/prod-module/pages/index.module.scss b/test/integration/scss-fixtures/prod-module/pages/index.module.scss
index 08a38e09ef8ea..eb8bb05c73aca 100644
--- a/test/integration/scss-fixtures/prod-module/pages/index.module.scss
+++ b/test/integration/scss-fixtures/prod-module/pages/index.module.scss
@@ -1,3 +1,4 @@
+$var: red;
 .redText {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/single-global-src/styles/global.scss b/test/integration/scss-fixtures/single-global-src/styles/global.scss
index 8e1524022baf8..da7b3d1417b1b 100644
--- a/test/integration/scss-fixtures/single-global-src/styles/global.scss
+++ b/test/integration/scss-fixtures/single-global-src/styles/global.scss
@@ -1,3 +1,4 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/single-global/styles/global.scss b/test/integration/scss-fixtures/single-global/styles/global.scss
index 8e1524022baf8..da7b3d1417b1b 100644
--- a/test/integration/scss-fixtures/single-global/styles/global.scss
+++ b/test/integration/scss-fixtures/single-global/styles/global.scss
@@ -1,3 +1,4 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss
index fdaf9c9476f9c..24f6145a7a6fa 100644
--- a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global1.scss
@@ -1,4 +1,5 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
   background-image: url('./dark.svg') url(dark2.svg);
 }
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss
index 37e7107172397..4b659d369c561 100644
--- a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2.scss
@@ -1,5 +1,6 @@
 @import './global2b.scss';
 
+$var: blue;
 .blue-text {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss
index 41c015298e5fd..0fe57600718f5 100644
--- a/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-1/styles/global2b.scss
@@ -1,5 +1,6 @@
+$var: orange;
 .blue-text {
-  color: orange;
+  color: $var;
   font-weight: bolder;
   background-image: url(../assets/light.svg);
 }
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss
index fdaf9c9476f9c..24f6145a7a6fa 100644
--- a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global1.scss
@@ -1,4 +1,5 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
   background-image: url('./dark.svg') url(dark2.svg);
 }
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss
index 37e7107172397..4b659d369c561 100644
--- a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2.scss
@@ -1,5 +1,6 @@
 @import './global2b.scss';
 
+$var: blue;
 .blue-text {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss
index 41c015298e5fd..0fe57600718f5 100644
--- a/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss
+++ b/test/integration/scss-fixtures/url-global-asset-prefix-2/styles/global2b.scss
@@ -1,5 +1,6 @@
+$var: orange;
 .blue-text {
-  color: orange;
+  color: $var;
   font-weight: bolder;
   background-image: url(../assets/light.svg);
 }
diff --git a/test/integration/scss-fixtures/url-global/styles/global1.scss b/test/integration/scss-fixtures/url-global/styles/global1.scss
index fdaf9c9476f9c..24f6145a7a6fa 100644
--- a/test/integration/scss-fixtures/url-global/styles/global1.scss
+++ b/test/integration/scss-fixtures/url-global/styles/global1.scss
@@ -1,4 +1,5 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
   background-image: url('./dark.svg') url(dark2.svg);
 }
diff --git a/test/integration/scss-fixtures/url-global/styles/global2.scss b/test/integration/scss-fixtures/url-global/styles/global2.scss
index 37e7107172397..4b659d369c561 100644
--- a/test/integration/scss-fixtures/url-global/styles/global2.scss
+++ b/test/integration/scss-fixtures/url-global/styles/global2.scss
@@ -1,5 +1,6 @@
 @import './global2b.scss';
 
+$var: blue;
 .blue-text {
-  color: blue;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/url-global/styles/global2b.scss b/test/integration/scss-fixtures/url-global/styles/global2b.scss
index 41c015298e5fd..0fe57600718f5 100644
--- a/test/integration/scss-fixtures/url-global/styles/global2b.scss
+++ b/test/integration/scss-fixtures/url-global/styles/global2b.scss
@@ -1,5 +1,6 @@
+$var: orange;
 .blue-text {
-  color: orange;
+  color: $var;
   font-weight: bolder;
   background-image: url(../assets/light.svg);
 }
diff --git a/test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss b/test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss
index 8e1524022baf8..da7b3d1417b1b 100644
--- a/test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss
+++ b/test/integration/scss-fixtures/valid-and-invalid-global/styles/global.scss
@@ -1,3 +1,4 @@
+$var: red;
 .red-text {
-  color: red;
+  color: $var;
 }
diff --git a/test/integration/scss-fixtures/with-styled-jsx/styles/global.scss b/test/integration/scss-fixtures/with-styled-jsx/styles/global.scss
index 167caa35ea86e..30a5d888c5011 100644
--- a/test/integration/scss-fixtures/with-styled-jsx/styles/global.scss
+++ b/test/integration/scss-fixtures/with-styled-jsx/styles/global.scss
@@ -1,3 +1,4 @@
+$var: red;
 .my-text {
-  color: red;
+  color: $var;
 }

From 30006435b2610ee0706eb35f27c3670a3678fc58 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 14:57:19 -0500
Subject: [PATCH 32/34] Turn on Scss support

---
 test/integration/scss-fixtures/next.config.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/integration/scss-fixtures/next.config.js b/test/integration/scss-fixtures/next.config.js
index 2a0ee47afec3c..b97156a83b09e 100644
--- a/test/integration/scss-fixtures/next.config.js
+++ b/test/integration/scss-fixtures/next.config.js
@@ -3,6 +3,7 @@ module.exports = {
     // Make sure entries are not getting disposed.
     maxInactiveAge: 1000 * 60 * 60,
   },
+  experimental: { scss: true },
   webpack(cfg) {
     cfg.devtool = 'source-map'
     return cfg

From 825d79039d539c9dcfcb75e659589763f04f0395 Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 14:59:16 -0500
Subject: [PATCH 33/34] fix HMR test

---
 test/integration/scss/test/index.test.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/integration/scss/test/index.test.js b/test/integration/scss/test/index.test.js
index 7696ca5648d1b..aca8a733f9951 100644
--- a/test/integration/scss/test/index.test.js
+++ b/test/integration/scss/test/index.test.js
@@ -319,7 +319,7 @@ describe('SCSS Support', () => {
 
         const cssFile = new File(join(appDir, 'styles/global1.scss'))
         try {
-          cssFile.replace('color: red', 'color: purple')
+          cssFile.replace('$var: red', '$var: purple')
           await waitFor(2000) // wait for HMR
 
           const refreshedColor = await browser.eval(

From 7572109c23876ffec066878de00b7d432fa57ebb Mon Sep 17 00:00:00 2001
From: Joe Haddad <joe.haddad@zeit.co>
Date: Wed, 22 Jan 2020 15:14:37 -0500
Subject: [PATCH 34/34] Fix snapshots

---
 test/integration/css-modules/test/index.test.js  | 2 +-
 test/integration/scss-modules/test/index.test.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/integration/css-modules/test/index.test.js b/test/integration/css-modules/test/index.test.js
index 3c0d865fd44dc..e990a2e04624c 100644
--- a/test/integration/css-modules/test/index.test.js
+++ b/test/integration/css-modules/test/index.test.js
@@ -286,7 +286,7 @@ describe('Valid CSS Module Usage from within node_modules', () => {
     const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
     expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
-      `".example_redText__1rb5g{color:\\"red\\"}"`
+      `".example_redText__1rb5g{color:red}"`
     )
   })
 })
diff --git a/test/integration/scss-modules/test/index.test.js b/test/integration/scss-modules/test/index.test.js
index d73f290d379f3..751ef2e07889c 100644
--- a/test/integration/scss-modules/test/index.test.js
+++ b/test/integration/scss-modules/test/index.test.js
@@ -286,7 +286,7 @@ describe('Valid CSS Module Usage from within node_modules', () => {
     const cssContent = await readFile(join(cssFolder, cssFiles[0]), 'utf8')
 
     expect(cssContent.replace(/\/\*.*?\*\//g, '').trim()).toMatchInlineSnapshot(
-      `".example_redText__1hNNA{color:\\"red\\"}"`
+      `".example_redText__1hNNA{color:red}"`
     )
   })
 })