export default (conf, env, options) => {
  // ....
-  conf.optimization = {
-    ...conf.optimization,
-    splitChunks: {
-      cacheGroups: {
-        refractor: {
-          test: /[\\/]node_modules[\\/](refractor)[\\/]/,
-          name: 'refractor-vendor',
-          chunks: 'all',
-        },
-      },
-    },
-  };
-  conf.output = { ...conf.output, publicPath: './' };
+  if (env === 'production') {
+    conf.optimization = {
+      ...conf.optimization,
+      splitChunks: {
+        cacheGroups: {
+          refractor: {
+            test: /[\\/]node_modules[\\/](refractor)[\\/]/,
+            name: 'refractor-vendor',
+            chunks: 'all',
+          },
+        },
+      },
+    };
+    conf.output = { ...conf.output, publicPath: './' };
+  }
  return conf;
}