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fix(nextjs-plugin): properly handles css loader (#1105)
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‎.changeset/witty-ties-bow.md

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---
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'@vanilla-extract/next-plugin': minor
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---
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Fix #1101. Correctly handle Next.js configuration.

‎examples/next/package.json

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@@ -9,7 +9,7 @@
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"start": "next start"
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},
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"dependencies": {
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"next": "^12.0.5",
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"next": "12.3.4",
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"react": "^17.0.2",
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"react-dom": "^17.0.2"
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},

‎packages/next-plugin/package.json

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@@ -19,9 +19,10 @@
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"browserslist": "^4.19.1"
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},
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"peerDependencies": {
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"next": ">=12.0.5"
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"next": ">=12.1.7"
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},
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"devDependencies": {
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"next": "^12.0.5"
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"next": "12.3.4",
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"webpack": "^5.36.1"
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}
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}

‎packages/next-plugin/src/index.ts

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import { VanillaExtractPlugin } from '@vanilla-extract/webpack-plugin';
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import browserslist from 'browserslist';
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import { lazyPostCSS } from 'next/dist/build/webpack/config/blocks/css';
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import { getGlobalCssLoader } from 'next/dist/build/webpack/config/blocks/css/loaders';
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import { findPagesDir } from 'next/dist/lib/find-pages-dir';
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import nextMiniCssExtractPluginExports from 'next/dist/build/webpack/plugins/mini-css-extract-plugin';
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import type webpack from 'webpack';
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import type { NextConfig } from 'next/types';
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import type { WebpackConfigContext } from 'next/dist/server/config-shared';
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// Next.js' built-in mini-css-extract-plugin has a very terrible type definition, let's just use any
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const NextMiniCssExtractPlugin: any =
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// @ts-expect-error -- Next.js' precompilation does add "__esModule: true", but doesn't add an actual default exports
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nextMiniCssExtractPluginExports.default;
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function getSupportedBrowsers(dir: any, isDevelopment: any) {
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let browsers;
@@ -18,12 +27,82 @@ function getSupportedBrowsers(dir: any, isDevelopment: any) {
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type PluginOptions = ConstructorParameters<typeof VanillaExtractPlugin>[0];
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// https://github.com/vercel/next.js/blob/canary/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L7
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const getVanillaExtractCssLoaders = (
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options: WebpackConfigContext,
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assetPrefix: string,
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) => {
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const loaders: webpack.RuleSetUseItem[] = [];
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// https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L14
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if (!options.isServer) {
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// https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/client.ts#L44
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// next-style-loader will mess up css order in development mode.
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// Next.js appDir doesn't use next-style-loader either.
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// So we always use css-loader here, to simplify things and get proper order of output CSS
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loaders.push({
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loader: NextMiniCssExtractPlugin.loader,
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options: {
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publicPath: `${assetPrefix}/_next/`,
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esModule: false,
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},
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});
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}
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const postcss = () =>
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lazyPostCSS(
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options.dir,
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getSupportedBrowsers(options.dir, options.dev),
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undefined,
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);
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// https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L28
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loaders.push({
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loader: require.resolve('next/dist/build/webpack/loaders/css-loader/src'),
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options: {
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postcss,
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importLoaders: 1,
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modules: false,
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},
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});
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// https://github.com/vercel/next.js/blob/a4f2bbbe2047d4ed88e9b6f32f6b0adfc8d0c46a/packages/next/src/build/webpack/config/blocks/css/loaders/global.ts#L43
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loaders.push({
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loader: require.resolve(
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'next/dist/build/webpack/loaders/postcss-loader/src',
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),
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options: {
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postcss,
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},
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});
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return loaders;
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};
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export const createVanillaExtractPlugin =
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(pluginOptions: PluginOptions = {}) =>
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(nextConfig: NextConfig = {}): NextConfig =>
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Object.assign({}, nextConfig, {
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webpack(config: any, options: any) {
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webpack(config: any, options: WebpackConfigContext) {
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const { dir, dev, isServer, config: resolvedNextConfig } = options;
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const findPagesDirResult = findPagesDir(
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dir,
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resolvedNextConfig.experimental?.appDir,
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);
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// https://github.com/vercel/next.js/blob/1fb4cad2a8329811b5ccde47217b4a6ae739124e/packages/next/build/index.ts#L336
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// https://github.com/vercel/next.js/blob/1fb4cad2a8329811b5ccde47217b4a6ae739124e/packages/next/build/webpack-config.ts#L626
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// https://github.com/vercel/next.js/pull/43916
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const hasAppDir =
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// on Next.js 12, findPagesDirResult is a string. on Next.js 13, findPagesDirResult is an object
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!!resolvedNextConfig.experimental?.appDir &&
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!!(findPagesDirResult && findPagesDirResult.appDir);
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const outputCss = hasAppDir
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? // Always output css since Next.js App Router needs to collect Server CSS from React Server Components
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true
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: // There is no appDir, do not output css on server build
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!isServer;
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const cssRules = config.module.rules.find(
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(rule: any) =>
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cssRules.unshift({
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test: /\.vanilla\.css$/i,
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sideEffects: true,
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use: getGlobalCssLoader(
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{
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assetPrefix: config.assetPrefix,
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isClient: !isServer,
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isServer,
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isDevelopment: dev,
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future: resolvedNextConfig.future || {},
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experimental: resolvedNextConfig.experimental || {},
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// @ts-ignore -- 'appDir' config is in beta
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hasAppDir: resolvedNextConfig.experimental?.appDir,
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} as any,
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() => lazyPostCSS(dir, getSupportedBrowsers(dir, dev), undefined),
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[],
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use: getVanillaExtractCssLoaders(
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options,
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resolvedNextConfig.assetPrefix,
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),
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});
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// vanilla-extract need to emit the css file on both server and client, both during the
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// development and production.
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// However, Next.js only add MiniCssExtractPlugin on pages dir + client build + production mode.
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//
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// To simplify the logic at our side, we will add MiniCssExtractPlugin based on
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// the "instanceof" check (We will only add our required MiniCssExtractPlugin if
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// Next.js hasn't added it yet).
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// This also prevent multiple MiniCssExtractPlugin being added (which will cause
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// RealContentHashPlugin to panic)
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if (
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!config.plugins.some(
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(plugin: any) => plugin instanceof NextMiniCssExtractPlugin,
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)
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) {
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// HMR reloads the CSS file when the content changes but does not use
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// the new file name, which means it can't contain a hash.
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const filename = dev
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? 'static/css/[name].css'
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: 'static/css/[contenthash].css';
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config.plugins.push(
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new NextMiniCssExtractPlugin({
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filename,
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chunkFilename: filename,
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// Next.js guarantees that CSS order "doesn't matter", due to imposed
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// restrictions:
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// 1. Global CSS can only be defined in a single entrypoint (_app)
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// 2. CSS Modules generate scoped class names by default and cannot
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// include Global CSS (:global() selector).
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//
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// While not a perfect guarantee (e.g. liberal use of `:global()`
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// selector), this assumption is required to code-split CSS.
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//
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// If this warning were to trigger, it'd be unactionable by the user,
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// but likely not valid -- so just disable it.
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ignoreOrder: true,
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}),
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);
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}
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config.plugins.push(
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new VanillaExtractPlugin({ outputCss: !isServer, ...pluginOptions }),
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new VanillaExtractPlugin({ outputCss, ...pluginOptions }),
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);
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if (typeof nextConfig.webpack === 'function') {

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