Switch to uglifyjs-webpack-plugin (vuejs-templates#1119)

Author: sudo-suhas

README.md

@@ -33,7 +33,7 @@ The development server will run on port 8080 by default. If that port is already
   - Source maps
 
 - `npm run build`: Production ready build.
-  - JavaScript minified with [UglifyJS](https://github.com/mishoo/UglifyJS2).
+  - JavaScript minified with [UglifyJS v3](https://github.com/mishoo/UglifyJS2/tree/harmony).
   - HTML minified with [html-minifier](https://github.com/kangax/html-minifier).
   - CSS across all components extracted into a single file and minified with [cssnano](https://github.com/ben-eb/cssnano).
   - Static assets compiled with version hashes for efficient long-term caching, and an auto-generated production `index.html` with proper URLs to these generated assets.

template/build/webpack.prod.conf.js

@@ -9,6 +9,7 @@ const CopyWebpackPlugin = require('copy-webpack-plugin')
 const HtmlWebpackPlugin = require('html-webpack-plugin')
 const ExtractTextPlugin = require('extract-text-webpack-plugin')
 const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
 
 const env = {{#if_or unit e2e}}process.env.NODE_ENV === 'testing'
   ? require('../config/test.env')
@@ -34,10 +35,11 @@ const webpackConfig = merge(baseWebpackConfig, {
     new webpack.DefinePlugin({
       'process.env': env
     }),
-    // UglifyJs do not support ES6+, you can also use babel-minify for better treeshaking: https://github.com/babel/minify
-    new webpack.optimize.UglifyJsPlugin({
-      compress: {
-        warnings: false
+    new UglifyJsPlugin({
+      uglifyOptions: {
+        compress: {
+          warnings: false
+        }
       },
       sourceMap: config.build.productionSourceMap,
       parallel: true

template/package.json

@@ -89,6 +89,7 @@
     "optimize-css-assets-webpack-plugin": "^3.2.0",
     "ora": "^1.2.0",
     "rimraf": "^2.6.0",
+    "uglifyjs-webpack-plugin": "^1.1.1",
     "url-loader": "^0.5.8",
     "vue-loader": "^13.3.0",
     "vue-style-loader": "^3.0.1",