fix(next-plugin): build not outputting css on windows

.changeset/wise-oranges-talk.md

@@ -0,0 +1,6 @@
+---
+"@vanilla-extract/next-plugin": patch
+"@vanilla-extract/webpack-plugin": patch
+---
+
+Fixes Next.js 13 CSS output on Windows when using React Server Components

.gitignore

@@ -9,4 +9,5 @@ test-results
 
 .pnp.*
 .next
-.DS_Store
+.DS_Store
+.idea

packages/next-plugin/package.json

@@ -4,6 +4,11 @@
   "description": "Zero-runtime Stylesheets-in-TypeScript",
   "main": "dist/vanilla-extract-next-plugin.cjs.js",
   "module": "dist/vanilla-extract-next-plugin.esm.js",
+  "preconstruct": {
+    "entrypoints": [
+      "index.ts"
+    ]
+  },
   "files": [
     "/dist"
   ],
@@ -15,8 +20,7 @@
   "author": "SEEK",
   "license": "MIT",
   "dependencies": {
-    "@vanilla-extract/webpack-plugin": "^2.3.0",
-    "browserslist": "^4.19.1"
+    "@vanilla-extract/webpack-plugin": "^2.3.0"
   },
   "peerDependencies": {
     "next": ">=12.1.7"

packages/next-plugin/src/index.ts

@@ -1,40 +1,45 @@
-import { VanillaExtractPlugin } from '@vanilla-extract/webpack-plugin';
-import browserslist from 'browserslist';
-import { lazyPostCSS } from 'next/dist/build/webpack/config/blocks/css';
+// @ts-expect-error
+import browserslist from 'next/dist/compiled/browserslist';
+import NextMiniCssExtractPluginDefault from 'next/dist/build/webpack/plugins/mini-css-extract-plugin';
+import { VanillaExtractPlugin } from '@vanilla-extract/webpack-plugin/next';
 import { findPagesDir } from 'next/dist/lib/find-pages-dir';
+import { lazyPostCSS } from 'next/dist/build/webpack/config/blocks/css';
 import { cssFileResolve } from 'next/dist/build/webpack/config/blocks/css/loaders/file-resolve';
-import NextMiniCssExtractPluginDefault from 'next/dist/build/webpack/plugins/mini-css-extract-plugin';
 
 import type webpack from 'webpack';
-import type { NextConfig } from 'next/types';
-import type { WebpackConfigContext } from 'next/dist/server/config-shared';
+import type {
+  NextConfig,
+  WebpackConfigContext,
+} from 'next/dist/server/config-shared';
+
+type PluginOptions = ConstructorParameters<typeof VanillaExtractPlugin>[0];
 
 const NextMiniCssExtractPlugin = NextMiniCssExtractPluginDefault as any;
 
-function getSupportedBrowsers(dir: any, isDevelopment: any) {
-  let browsers;
+// Adopted from https://github.com/vercel/next.js/blob/1f1632979c78b3edfe59fd85d8cce62efcdee688/packages/next/build/webpack-config.ts#L60-L72
+function getSupportedBrowsers(dir: string, isDevelopment: boolean) {
   try {
-    browsers = browserslist.loadConfig({
+    return browserslist.loadConfig({
       path: dir,
       env: isDevelopment ? 'development' : 'production',
     });
-  } catch {}
-
-  return browsers;
+  } catch (_) {
+    return undefined;
+  }
 }
 
-type PluginOptions = ConstructorParameters<typeof VanillaExtractPlugin>[0];
-
-// https://github.com/vercel/next.js/blob/canary/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L7
+// Adopt from Next.js' getGlobalCssLoader
+// https://github.com/vercel/next.js/blob/6e5b935fd7a61497f6854a81aec7df3a5dbf61ac/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L7
 const getVanillaExtractCssLoaders = (
   options: WebpackConfigContext,
   assetPrefix: string,
 ) => {
   const loaders: webpack.RuleSetUseItem[] = [];
 
-  // https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L14
+  // Adopt from Next.js' getClientStyleLoader
+  // https://github.com/vercel/next.js/blob/6e5b935fd7a61497f6854a81aec7df3a5dbf61ac/packages/next/src/build/webpack/config/blocks/css/loaders/client.ts#L3
   if (!options.isServer) {
-    // https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/client.ts#L44
+    // https://github.com/vercel/next.js/blob/6e5b935fd7a61497f6854a81aec7df3a5dbf61ac/packages/next/src/build/webpack/config/blocks/css/loaders/client.ts#L44
     // next-style-loader will mess up css order in development mode.
     // Next.js appDir doesn't use next-style-loader either.
     // So we always use css-loader here, to simplify things and get proper order of output CSS
@@ -54,7 +59,7 @@ const getVanillaExtractCssLoaders = (
       undefined,
     );
 
-  // https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L28
+  // https://github.com/vercel/next.js/blob/6e5b935fd7a61497f6854a81aec7df3a5dbf61ac/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L28
   loaders.push({
     loader: require.resolve('next/dist/build/webpack/loaders/css-loader/src'),
     options: {
@@ -76,7 +81,7 @@ const getVanillaExtractCssLoaders = (
     },
   });
 
-  // https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L43
+  // https://github.com/vercel/next.js/blob/6e5b935fd7a61497f6854a81aec7df3a5dbf61ac/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L29-L38
   loaders.push({
     loader: require.resolve(
       'next/dist/build/webpack/loaders/postcss-loader/src',
@@ -86,102 +91,109 @@ const getVanillaExtractCssLoaders = (
     },
   });
 
+  // https://github.com/SukkaW/style9-webpack/blob/f51c46bbcd95ea3b988d3559c3b35cc056874366/src/next-appdir/index.ts#L103-L105
+  loaders.push({
+    loader: VanillaExtractPlugin.loader,
+  });
+
   return loaders;
 };
 
-export const createVanillaExtractPlugin =
-  (pluginOptions: PluginOptions = {}) =>
-  (nextConfig: NextConfig = {}): NextConfig =>
-    Object.assign({}, nextConfig, {
-      webpack(config: any, options: WebpackConfigContext) {
-        const { dir, dev, isServer, config: resolvedNextConfig } = options;
-        const findPagesDirResult = findPagesDir(
-          dir,
-          resolvedNextConfig.experimental?.appDir,
-        );
-
-        // https://github.com/vercel/next.js/blob/1fb4cad2a8329811b5ccde47217b4a6ae739124e/packages/next/build/index.ts#L336
-        // https://github.com/vercel/next.js/blob/1fb4cad2a8329811b5ccde47217b4a6ae739124e/packages/next/build/webpack-config.ts#L626
-        // https://github.com/vercel/next.js/pull/43916
-        const hasAppDir =
-          // on Next.js 12, findPagesDirResult is a string. on Next.js 13, findPagesDirResult is an object
-          !!resolvedNextConfig.experimental?.appDir &&
-          !!(findPagesDirResult && findPagesDirResult.appDir);
-
-        const outputCss = hasAppDir
-          ? // Always output css since Next.js App Router needs to collect Server CSS from React Server Components
-            true
-          : // There is no appDir, do not output css on server build
-            !isServer;
-
-        const cssRules = config.module.rules.find(
-          (rule: any) =>
-            Array.isArray(rule.oneOf) &&
-            rule.oneOf.some(
-              ({ test }: any) =>
-                typeof test === 'object' &&
-                typeof test.test === 'function' &&
-                test.test('filename.css'),
-            ),
-        ).oneOf;
-
-        cssRules.unshift({
-          test: /\.vanilla\.css$/i,
-          sideEffects: true,
-          use: getVanillaExtractCssLoaders(
-            options,
-            resolvedNextConfig.assetPrefix,
+export const createVanillaExtractPlugin = (
+  pluginOptions: PluginOptions = {},
+) => {
+  return (nextConfig: NextConfig = {}): NextConfig => ({
+    ...nextConfig,
+    webpack(config: any, options: WebpackConfigContext) {
+      const { dir, dev, isServer, config: resolvedNextConfig } = options;
+
+      // https://github.com/vercel/next.js/blob/1fb4cad2a8329811b5ccde47217b4a6ae739124e/packages/next/build/index.ts#L336
+      // https://github.com/vercel/next.js/blob/1fb4cad2a8329811b5ccde47217b4a6ae739124e/packages/next/build/webpack-config.ts#L626
+      // https://github.com/vercel/next.js/pull/43916
+      // on Next.js 12, findPagesDirResult is a string. on Next.js 13, findPagesDirResult is an object
+      const findPagesDirResult = findPagesDir(
+        dir,
+        resolvedNextConfig.experimental?.appDir ?? false,
+      );
+      const hasAppDir =
+        !!resolvedNextConfig.experimental?.appDir &&
+        !!(findPagesDirResult && findPagesDirResult.appDir);
+
+      const outputCss = hasAppDir
+        ? // Always output css since Next.js App Router needs to collect Server CSS from React Server Components
+          true
+        : // There is no appDir, do not output css on server build
+          !isServer;
+
+      // https://github.com/vercel/next.js/blob/6e5b935fd7a61497f6854a81aec7df3a5dbf61ac/packages/next/src/build/webpack/config/helpers.ts#L12-L21
+      const cssRules = config.module.rules.find(
+        (rule: any) =>
+          Array.isArray(rule.oneOf) &&
+          rule.oneOf.some(
+            ({ test }: any) =>
+              typeof test === 'object' &&
+              typeof test.test === 'function' &&
+              test.test('filename.css'),
           ),
-        });
-
-        // vanilla-extract need to emit the css file on both server and client, both during the
-        // development and production.
-        // However, Next.js only add MiniCssExtractPlugin on pages dir + client build + production mode.
-        //
-        // To simplify the logic at our side, we will add MiniCssExtractPlugin based on
-        // the "instanceof" check (We will only add our required MiniCssExtractPlugin if
-        // Next.js hasn't added it yet).
-        // This also prevent multiple MiniCssExtractPlugin being added (which will cause
-        // RealContentHashPlugin to panic)
-        if (
-          !config.plugins.some(
-            (plugin: any) => plugin instanceof NextMiniCssExtractPlugin,
-          )
-        ) {
-          // HMR reloads the CSS file when the content changes but does not use
-          // the new file name, which means it can't contain a hash.
-          const filename = dev
-            ? 'static/css/[name].css'
-            : 'static/css/[contenthash].css';
-
-          config.plugins.push(
-            new NextMiniCssExtractPlugin({
-              filename,
-              chunkFilename: filename,
-              // Next.js guarantees that CSS order "doesn't matter", due to imposed
-              // restrictions:
-              // 1. Global CSS can only be defined in a single entrypoint (_app)
-              // 2. CSS Modules generate scoped class names by default and cannot
-              //    include Global CSS (:global() selector).
-              //
-              // While not a perfect guarantee (e.g. liberal use of `:global()`
-              // selector), this assumption is required to code-split CSS.
-              //
-              // If this warning were to trigger, it'd be unactionable by the user,
-              // but likely not valid -- so just disable it.
-              ignoreOrder: true,
-            }),
-          );
-        }
+      ).oneOf;
+
+      // https://github.com/SukkaW/style9-webpack/blob/f51c46bbcd95ea3b988d3559c3b35cc056874366/src/next-appdir/index.ts#L187-L190
+      cssRules.unshift({
+        test: /vanilla\.virtual\.css/i,
+        sideEffects: true,
+        use: getVanillaExtractCssLoaders(
+          options,
+          resolvedNextConfig.assetPrefix,
+        ),
+      });
+
+      // vanilla-extract need to emit the css file on both server and client, both during the
+      // development and production.
+      // However, Next.js only add MiniCssExtractPlugin on pages dir + client build + production mode.
+      //
+      // To simplify the logic at our side, we will add MiniCssExtractPlugin based on
+      // the "instanceof" check (We will only add our required MiniCssExtractPlugin if
+      // Next.js hasn't added it yet).
+      // This also prevent multiple MiniCssExtractPlugin being added (which will cause
+      // RealContentHashPlugin to panic)
+      if (
+        !config.plugins.some((p: any) => p instanceof NextMiniCssExtractPlugin)
+      ) {
+        // HMR reloads the CSS file when the content changes but does not use
+        // the new file name, which means it can't contain a hash.
+        const filename = dev
+          ? 'static/css/[name].css'
+          : 'static/css/[contenthash].css';
 
         config.plugins.push(
-          new VanillaExtractPlugin({ outputCss, ...pluginOptions }),
+          new NextMiniCssExtractPlugin({
+            filename,
+            chunkFilename: filename,
+            // Next.js guarantees that CSS order "doesn't matter", due to imposed
+            // restrictions:
+            // 1. Global CSS can only be defined in a single entrypoint (_app)
+            // 2. CSS Modules generate scoped class names by default and cannot
+            //    include Global CSS (:global() selector).
+            //
+            // While not a perfect guarantee (e.g. liberal use of `:global()`
+            // selector), this assumption is required to code-split CSS.
+            //
+            // If this warning were to trigger, it'd be unactionable by the user,
+            // but likely not valid -- so just disable it.
+            ignoreOrder: true,
+          }),
         );
+      }
 
-        if (typeof nextConfig.webpack === 'function') {
-          return nextConfig.webpack(config, options);
-        }
+      config.plugins.push(
+        new VanillaExtractPlugin({ outputCss, ...pluginOptions }),
+      );
 
-        return config;
-      },
-    });
+      if (typeof nextConfig.webpack === 'function') {
+        return nextConfig.webpack(config, options);
+      }
+
+      return config;
+    },
+  });
+};

packages/webpack-plugin/next/package.json

@@ -0,0 +1,4 @@
+{
+  "main": "dist/vanilla-extract-webpack-plugin-next.cjs.js",
+  "module": "dist/vanilla-extract-webpack-plugin-next.esm.js"
+}

packages/webpack-plugin/package.json

@@ -17,20 +17,33 @@
     "./virtualFileLoader": {
       "module": "./virtualFileLoader/dist/vanilla-extract-webpack-plugin-virtualFileLoader.esm.js",
       "default": "./virtualFileLoader/dist/vanilla-extract-webpack-plugin-virtualFileLoader.cjs.js"
+    },
+    "./next": {
+      "module": "./next/dist/vanilla-extract-webpack-plugin-next.esm.js",
+      "default": "./next/dist/vanilla-extract-webpack-plugin-next.cjs.js"
+    },
+    "./virtualNextFileLoader": {
+      "module": "./virtualNextFileLoader/dist/vanilla-extract-webpack-plugin-virtualNextFileLoader.esm.js",
+      "default": "./virtualNextFileLoader/dist/vanilla-extract-webpack-plugin-virtualNextFileLoader.cjs.js"
     }
   },
   "preconstruct": {
     "entrypoints": [
       "index.ts",
       "loader.ts",
-      "virtualFileLoader.ts"
+      "virtualFileLoader.ts",
+      "next.ts",
+      "virtualNextFileLoader.ts"
     ]
   },
   "files": [
     "/dist",
     "/loader",
     "/virtualFileLoader",
-    "extracted.js"
+    "/next",
+    "/virtualNextFileLoader",
+    "extracted.js",
+    "vanilla.virtual.css"
   ],
   "repository": {
     "type": "git",