Webpack update for fixing Gutenberg translations.

webpack.config.js

@@ -110,7 +110,7 @@ module.exports = {
 };
 
 // Change to true for production mode
-const production = false;
+const production = true;
 
 if (production === true) {
     const TerserPlugin = require('terser-webpack-plugin');
@@ -129,7 +129,18 @@ if (production === true) {
         }),
         new TerserPlugin({
             parallel: true,
-            sourceMap: false
+            sourceMap: false,
+            cache: true,
+            terserOptions: {
+                // We preserve function names that start with capital letters as
+                // they're _likely_ component names, and these are useful to have
+                // in tracebacks and error messages.
+                keep_fnames: /__|_x|_n|_nx|sprintf|^[A-Z].+$/,
+                output: {
+                    comments: /translators:/i,
+                },
+            },
+            extractComments: false,
         }),
         new webpack.LoaderOptionsPlugin({
             minimize: true