fix: Use standalone uglify plugin

Author: finom

package-lock.json

@@ -10,8 +10,8 @@
     "build-eslint": "rimraf eslint && npm run clone-eslint && npm run webpackify-eslint && cd eslint && npm install --production",
     "clone-eslint": "git clone https://github.com/eslint/eslint.git eslint",
     "webpackify-eslint": "node tools/webpackify-eslint",
-    "develop": "NODE_ENV=development PORT=8014 concurrently --kill-others 'nodemon ./packages/backend --watch packages/backend' 'webpack-dev-server --no-info --config webpack'",
-    "build": "NODE_ENV=production webpack --config webpack --display-error-details",
+    "develop": "NODE_ENV=development PORT=8014 concurrently --kill-others 'nodemon ./packages/backend --watch packages/backend' 'webpack-dev-server --no-info --config webpack --mode=development'",
+    "build": "NODE_ENV=production webpack --config webpack --display-error-details --mode=production",
     "upgrade": "rimraf package-lock.json && ncu -a -x eslint-plugin-jsx-a11y,semantic-release && npm install && lerna exec --concurrency 1 -- rimraf package-lock.json && lerna exec --concurrency 1 -- ncu -a && lerna exec -- npm install",
     "semantic-release": "semantic-release pre && ssh-keyscan 192.241.157.86 >> ~/.ssh/known_hosts && npm run deploy && semantic-release post",
     "deploy": "pm2 deploy ecosystem.config.js production --force",
@@ -90,6 +90,7 @@
     "semantic-release": "^6.3.6",
     "semver": "^5.5.0",
     "style-loader": "^0.21.0",
+    "uglifyjs-webpack-plugin": "^1.2.5",
     "validate-commit-msg": "^2.14.0",
     "webpack": "^4.9.1",
     "webpack-cli": "^2.1.4",

package.json

@@ -3,6 +3,7 @@ const CopyWebpackPlugin = require('copy-webpack-plugin');
 const OpenBrowserPlugin = require('open-browser-webpack-plugin');
 const HtmlWebpackPlugin = require('html-webpack-plugin');
 const ExtractTextPlugin = require('extract-text-webpack-plugin');
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
 
 const { isDevelopment, isProduction, devPort } = require('./env');
 
@@ -32,11 +33,7 @@ if (isDevelopment) {
         })
     );
 } else if (isProduction) {
-    plugins.push(new webpack.optimize.UglifyJsPlugin({
-        compress: {
-            warnings: false
-        }
-    }));
+    plugins.push(new UglifyJsPlugin());
 }
 
 plugins.push(new CopyWebpackPlugin([{