feat: optimize minification

Author: yyx990803

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

@@ -35,6 +35,9 @@ module.exports = (api, options) => {
         .add(api.resolve('node_modules'))
         .add(resolveLocal('node_modules'))
 
+    webpackConfig.module
+      .noParse(/^(vue|vue-router|vuex|vuex-router-sync)$/)
+
     // js is handled by cli-plugin-bable
 
     webpackConfig.module

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

@@ -49,6 +49,37 @@ module.exports = (api, options) => {
             .use(require('uglifyjs-webpack-plugin'), [{
               uglifyOptions: {
                 compress: {
+                  // turn off flags with small gains to speed up minification
+                  arrows: false,
+                  collapse_vars: false, // 0.3kb
+                  comparisons: false,
+                  computed_props: false,
+                  hoist_funs: false,
+                  hoist_props: false,
+                  hoist_vars: false,
+                  inline: false,
+                  loops: false,
+                  negate_iife: false,
+                  properties: false,
+                  reduce_funcs: false,
+                  reduce_vars: false,
+                  switches: false,
+                  toplevel: false,
+                  typeofs: false,
+
+                  // a few flags with noticable gains/speed ratio
+                  // numbers based on out of the box vendor bundle
+                  booleans: true, // 0.7kb
+                  if_return: true, // 0.4kb
+                  sequences: true, // 0.7kb
+                  unused: true, // 2.3kb
+
+                  // required features to drop conditional branches
+                  conditionals: true,
+                  dead_code: true,
+                  evaluate: true,
+
+                  // turn off warnings when dropping dead code
                   warnings: false
                 }
               },