Run postcss for webpack bundle

webpack.prod.js

@@ -4,16 +4,16 @@ const merge = require("webpack-merge");
 
 module.exports = merge(common, {
     mode: "production",
-    output: {
-        filename: "bundle.js",
-        path: path.resolve(__dirname, "dist"),
-        libraryTarget: "amd-require"
-    },
     module: {
         rules: [
+            {
+                test: /\.js$/,
+                exclude: /node_modules/,
+                loader: "babel-loader"
+            },
             {
                 test: /\.css$/i,
-                use: ["style-loader", "css-loader"]
+                use: ["style-loader", "css-loader", "postcss-loader"]
             },
             {
                 test: /\.(png|jpg|gif)$/i,