webpack prod removes console.log, + minor adjustments

build/webpack.config.prod.js

@@ -3,6 +3,7 @@
 const merge = require('webpack-merge')
 const baseConfig = require('./webpack.config.base')
 const MiniCssExtractPlugin  = require('mini-css-extract-plugin')
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
 
 module.exports = merge(baseConfig, {
   mode: 'production',
@@ -16,6 +17,19 @@ module.exports = merge(baseConfig, {
         },
       },
     },
+    minimizer: [new UglifyJsPlugin({
+      sourceMap:true,
+      cache: true,
+      parallel: true,
+      uglifyOptions:{
+        ecma:8,
+        compress: {
+          // drop_console: true
+          pure_funcs: ['console.log']
+        }
+      },
+      exclude: 'vendor.js',
+    })]
   },
   module: {
     rules: [