feat: add caching for babel

Author: yyx990803

packages/@vue/cli-plugin-babel/index.js

@@ -1,4 +1,6 @@
 module.exports = api => {
+  const cacheDirectory = api.resolve('node_modules/.cache/cache-loader')
+
   api.chainWebpack(webpackConfig => {
     webpackConfig.module
       .rule('js')
@@ -7,7 +9,26 @@ module.exports = api => {
           .add(api.resolve('src'))
           .add(api.resolve('test'))
           .end()
+        .use('cache-loader')
+          .loader(require.resolve('cache-loader'))
+          .options({ cacheDirectory })
+          .end()
         .use('babel-loader')
           .loader(require.resolve('babel-loader'))
+
+    webpackConfig.module
+      .rule('vue')
+        .use('vue-loader')
+        .tap(options => {
+          options.loaders = options.loaders || {}
+          options.loaders.js = [
+            {
+              loader: 'cache-loader',
+              options: { cacheDirectory }
+            },
+            'babel-loader'
+          ]
+          return options
+        })
   })
 }

packages/@vue/cli-plugin-babel/package.json

@@ -20,7 +20,8 @@
   "homepage": "https://github.com/vuejs/vue-cli/packages/@vue/cli-plugin-babel#readme",
   "dependencies": {
     "@babel/core": "^7.0.0-0",
-    "babel-loader": "^7.1.2"
+    "babel-loader": "^7.1.2",
+    "cache-loader": "^1.2.0"
   },
   "publishConfig": {
     "access": "public"

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

@@ -150,7 +150,20 @@ module.exports = (api, options) => {
             ignore: ['index.html', '.*']
           }]])
 
-      // TODO investigate happypack/cache-loader/DLL plugin options
+      // TODO parallelazation
+      // thread-loader doesn't seem to have obvious effect because vue-loader
+      // offloads most of the work to other loaders. We may need to re-think
+      // vue-loader implementation in order to better take advantage of
+      // parallelazation
+
+      // webpackConfig.module
+      //   .rule('vue')
+      //     .use('thread-loader')
+      //       .before('vue-loader')
+      //       .loader('thread-loader')
+      //       .options({ name: 'vue' })
+
+      // TODO DLL
     }
   })
 }

yarn.lock

@@ -1590,6 +1590,15 @@ cache-base@^1.0.1:
     union-value "^1.0.0"
     unset-value "^1.0.0"
 
+cache-loader@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/cache-loader/-/cache-loader-1.2.0.tgz#cdc313ae53b3c13ce8ee0c9296cf16c736b15252"
+  dependencies:
+    async "^2.4.1"
+    loader-utils "^1.1.0"
+    mkdirp "^0.5.1"
+    schema-utils "^0.4.2"
+
 caller-path@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/caller-path/-/caller-path-0.1.0.tgz#94085ef63581ecd3daa92444a8fe94e82577751f"