module.exports = {
  plugins: [
    require("cssnano")({
      preset: "advanced"
    })
  ]
};

@@ -1,8 +1,58 @@
+const licenseBanner = require(%22./build/banner%22);%0A%0A
 module.e
@@ -132,15 +132,111 @@
 %0A    %7D)%0A
+    ,%0A    require(%22postcss-banner%22)(%7B%0A      banner: licenseBanner,%0A      important: true%0A    %7D)%0A
   %5D%0A%7D;%0A

add postcss-banner plugin