improve prod chunk splitting

lib/builder/webpack/client.js

@@ -113,7 +113,15 @@ export default class WebpackClientConfig extends WebpackBaseConfig {
         new UglifyJsWebpackPlugin({
           parallel: true,
           cache: this.options.build.cache,
-          sourceMap: false
+          sourceMap: false,
+          extractComments: {
+            filename: 'LICENSES'
+          },
+          uglifyOptions: {
+            output: {
+              comments: /^\**!|@preserve|@license|@cc_on/
+            }
+          }
         })
       ]
     }

lib/common/nuxt.config.js

@@ -58,6 +58,7 @@ export default {
       splitChunks: {
         chunks: 'all',
         automaticNameDelimiter: '.',
+        name: undefined,
         cacheGroups: {}
       }
     },

lib/common/options.js

@@ -177,6 +177,12 @@ Options.from = function (_options) {
     options.generate.fallback = '404.html'
   }
 
+  // Enable [name] when analyze or dev mode
+  if (options.build.optimization.splitChunks.name === undefined &&
+    (options.dev || options.build.analyze)) {
+    options.build.optimization.splitChunks.name = true
+  }
+
   // TODO: remove when mini-css-extract-plugin supports HMR
   if (options.dev) {
     options.build.extractCSS = false