feat: production server build

webpack.common.config.js

@@ -2,8 +2,10 @@ const path = require('path');
 
 const webpack = require('webpack');
 
+const isProduction = !!process.argv.find((arg) => '--production' === arg);
+
 const config = {
-  mode: 'development',
+  mode: isProduction ? 'production' : 'development',
   module: {
     rules: [
       {
@@ -53,6 +55,7 @@ const config = {
     ],
   },
   output: {
+    // Worker happiness.
     globalObject: `(typeof self === 'undefined' ? this : self)`,
     path: path.resolve(__dirname, 'dist'),
     filename: '[name].js',