Merge pull request #2032 from overleaf/as-upgrade-webpack

Upgrade webpack to v4

GitOrigin-RevId: a92c487fee79c29c5314273bf05439c9dbb0ce4d

services/web/webpack.config.prod.js

@@ -1,30 +1,15 @@
 const path = require('path')
-const webpack = require('webpack')
 const merge = require('webpack-merge')
 
 const base = require('./webpack.config')
 
 module.exports = merge(base, {
+  mode: 'production',
+
   devtool: false,
 
   output: {
     // Override output path to minjs dir
-    path: path.join(__dirname, '/public/minjs/es'),
-  },
-
-  plugins: [
-    // Use UglifyJS to minimise output
-    new webpack.optimize.UglifyJsPlugin({
-      // Enable compression (options here are UglifyJS options)
-      compress: {
-        drop_console: true, // Remove console logs
-        warnings: false // Silence Uglify warnings
-      },
-      output: {
-        comments: false // Remove comments
-      },
-      // Prevent source map files from being stripped out of bundle
-      sourceMap: true
-    })
-  ]
+    path: path.join(__dirname, '/public/minjs/es')
+  }
 })