From 7e308f934087337dc3f278563fd752627c1b8731 Mon Sep 17 00:00:00 2001
From: Pooya Parsa <pooya@pi0.ir>
Date: Fri, 23 Mar 2018 01:00:51 +0430
Subject: [PATCH] perf: speed up uglify-js by using parallel and cache options

---
 lib/builder/webpack/client.mjs | 15 ++++++++++++++-
 package.json                   |  1 +
 yarn.lock                      |  2 +-
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/lib/builder/webpack/client.mjs b/lib/builder/webpack/client.mjs
index adf8b463cd..a88b3a866d 100644
--- a/lib/builder/webpack/client.mjs
+++ b/lib/builder/webpack/client.mjs
@@ -4,6 +4,7 @@ import webpack from 'webpack'
 import HTMLPlugin from 'html-webpack-plugin'
 import BundleAnalyzer from 'webpack-bundle-analyzer'
 import MiniCssExtractPlugin from 'mini-css-extract-plugin'
+import UglifyJsWebpackPlugin from 'uglifyjs-webpack-plugin'
 
 import VueSSRClientPlugin from './plugins/vue/client'
 import BaseConfig from './base'
@@ -105,8 +106,20 @@ export default class WebpackClientConfig extends BaseConfig {
       }
     }
 
+    // Make uglifyjs faster
+    if (!this.options.dev && !config.optimization.minimizer) {
+      // https://github.com/webpack-contrib/uglifyjs-webpack-plugin
+      config.optimization.minimizer = [
+        new UglifyJsWebpackPlugin({
+          parallel: true,
+          cache: true,
+          sourceMap: false
+        })
+      ]
+    }
+
+    // Add HMR support
     if (this.options.dev) {
-      // Add HMR support
       config.entry = [
         // https://github.com/glenjamin/webpack-hot-middleware#config
         `webpack-hot-middleware/client?name=client&reload=true&timeout=30000&path=${
diff --git a/package.json b/package.json
index 37b67cb1e4..7ee8f782de 100644
--- a/package.json
+++ b/package.json
@@ -102,6 +102,7 @@
     "source-map": "^0.7.2",
     "style-resources-loader": "^1.1.0",
     "time-fix-plugin": "^2.0.0",
+    "uglifyjs-webpack-plugin": "^1.2.4",
     "upath": "^1.0.2",
     "url-loader": "^1.0.1",
     "vue": "^2.5.16",
diff --git a/yarn.lock b/yarn.lock
index a176a89d68..c3097abb67 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7115,7 +7115,7 @@ uglify-to-browserify@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz#6e0924d6bda6b5afe349e39a6d632850a0f882b7"
 
-uglifyjs-webpack-plugin@^1.1.1:
+uglifyjs-webpack-plugin@^1.1.1, uglifyjs-webpack-plugin@^1.2.4:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.4.tgz#5eec941b2e9b8538be0a20fc6eda25b14c7c1043"
   dependencies: