Actually turn on production mode: env vars need to be explicitly passed through

webpack.config.js

@@ -19,7 +19,12 @@ module.exports = {
         },
     },
     plugins: [
-        new webpack.IgnorePlugin(/^olm/)
+        new webpack.IgnorePlugin(/^olm/),
+        new webpack.DefinePlugin({
+            'process.env': {
+                NODE_ENV: JSON.stringify(process.env.NODE_ENV)
+            }
+        })
     ],
     devtool: 'source-map'
 };