Sending the source map out of the main JS file to reduce size

front/webpack.prod.js

@@ -0,0 +1,7 @@
+const merge = require('webpack-merge');
+const common = require('./webpack.config.js');
+
+module.exports = merge(common, {
+  mode: 'production',
+  devtool: 'source-map'
+});