config webpack for compiler

apps/solidity-compiler/webpack.config.js

 const nxWebpack = require('@nrwl/react/plugins/webpack')
+const TerserPlugin = require('terser-webpack-plugin')
 
 module.exports = config => {
   const nxWebpackConfig = nxWebpack(config)
-
-    return {
+  const webpackConfig = {
     ...nxWebpackConfig,
     node: {
       fs: 'empty',
@@ -14,4 +14,18 @@ module.exports = config => {
       child_process: 'empty'
     }
   }
+
+  if (process.env.NODE_ENV === 'production') {
+    return {
+      ...webpackConfig,
+      mode: 'production',
+      devtool: 'source-map',
+      optimization: {
+        minimize: true,
+        minimizer: [new TerserPlugin()]
+      }
+    }
+  } else {
+    return webpackConfig
+  }
 }