Merge module rules with custom webpack config

README.md

@@ -101,6 +101,23 @@ module.exports = function(env, args) {
 };
 ```
 
+If you want to adapt predefined rules or add new ones you may do so by matching `test`-expression:
+
+```Javascript
+module.exports = function(env, args) {
+  return {
+    module: {
+      rules: [
+        {
+          test: /\.(sass|scss)$/,  // use same expression if you want to modify rule
+          ...
+        }
+      ]
+    },
+  };
+};
+```
+
 To remove entry points from webpack, you can set them to null in your own configuration
 
 ## Using modernizr

helpers/configHelpers.js

@@ -32,7 +32,16 @@ function buildCustomConfiguration(environment) {
   const customConfig = getCustomWebpackConfiguration();
 
   return function (env, args) {
-    return mergeWithCustomize({
+    return mergeWithRules({
+      module: {
+        rules : {
+          test: "match",
+          use: {
+            loader: "match",
+            options: "replace"
+          }
+        }
+      },
       customizeObject(a, b, key) {
         if (key === 'entry') {
           Object.keys(a).forEach((key) => {