feat: re-introduce css.modules option

BREAKING CHANGE: internal webpack rules for CSS have been changed.

Author: yyx990803

packages/@vue/cli-service/__tests__/css.spec.js

@@ -22,12 +22,15 @@ const genConfig = (pkg = {}, env) => {
   return config
 }
 
-const findRule = (config, lang, index = 2) => {
+const findRule = (config, lang, index = 3) => {
   const baseRule = config.module.rules.find(rule => {
     return rule.test.test(`.${lang}`)
   })
-  // all CSS rules have oneOf with two child rules, one for <style lang="module">
-  // and one for normal imports
+  // all CSS rules have 4 oneOf rules:
+  // - <style lang="module"> in Vue files
+  // - <style> in Vue files
+  // - *.modules.css imports from JS
+  // - *.css imports from JS
   return baseRule.oneOf[index]
 }
 
@@ -76,7 +79,13 @@ test('production defaults', () => {
 })
 
 test('CSS Modules rules', () => {
-  const config = genConfig()
+  const config = genConfig({
+    vue: {
+      css: {
+        modules: true
+      }
+    }
+  })
   LANGS.forEach(lang => {
     const expected = {
       importLoaders: lang === 'css' ? 1 : 2, // no postcss-loader
@@ -85,10 +94,12 @@ test('CSS Modules rules', () => {
       sourceMap: false,
       modules: true
     }
-    // module-query rules
+    // vue-modules rules
     expect(findOptions(config, lang, 'css', 0)).toEqual(expected)
-    // module-ext rules
-    expect(findOptions(config, lang, 'css', 1)).toEqual(expected)
+    // normal-modules rules
+    expect(findOptions(config, lang, 'css', 2)).toEqual(expected)
+    // normal rules
+    expect(findOptions(config, lang, 'css', 3)).toEqual(expected)
   })
 })
 

packages/@vue/cli-service/lib/config/css.js

@@ -14,6 +14,7 @@ module.exports = (api, options) => {
     const getAssetPath = require('../util/getAssetPath')
 
     const {
+      modules = false,
       extract = true,
       sourceMap = false,
       localIdentName = '[name]_[local]_[hash:base64:5]',
@@ -43,15 +44,20 @@ module.exports = (api, options) => {
       const baseRule = webpackConfig.module.rule(lang).test(test)
 
       // rules for <style lang="module">
-      const modulesRule = baseRule.oneOf('modules-query').resourceQuery(/module/)
-      applyLoaders(modulesRule, true)
+      const vueModulesRule = baseRule.oneOf('vue-modules').resourceQuery(/module/)
+      applyLoaders(vueModulesRule, true)
+
+      // rules for <style>
+      const vueNormalRule = baseRule.oneOf('vue').resourceQuery(/\?vue/)
+      applyLoaders(vueNormalRule, false)
 
       // rules for *.module.* files
-      const modulesExtRule = baseRule.oneOf('modules-ext').test(/\.module\.\w+$/)
-      applyLoaders(modulesExtRule, true)
+      const extModulesRule = baseRule.oneOf('normal-modules').test(/\.module\.\w+$/)
+      applyLoaders(extModulesRule, true)
 
+      // rules for normal CSS imports
       const normalRule = baseRule.oneOf('normal')
-      applyLoaders(normalRule, false)
+      applyLoaders(normalRule, modules)
 
       function applyLoaders (rule, modules) {
         if (shouldExtract) {

packages/@vue/cli-service/lib/options.js

@@ -12,6 +12,7 @@ const schema = createSchema(joi => joi.object({
 
   // css
   css: joi.object({
+    modules: joi.boolean(),
     localIdentName: joi.string(),
     extract: joi.alternatives().try(joi.boolean(), joi.object()),
     sourceMap: joi.boolean(),
@@ -66,6 +67,7 @@ exports.defaults = () => ({
 
   css: {
     // extract: true,
+    // modules: false,
     // localIdentName: '[name]_[local]_[hash:base64:5]',
     // sourceMap: false,
     // loaderOptions: {}