use minify

node_modules/minify/lib/css.js

@@ -0,0 +1,27 @@
+/* сжимаем код через clean-css */
+'use strict';
+
+const assert = require('assert');
+const Clean = require('clean-css');
+
+/**
+ * minify css data.
+ *
+ * @param data
+ */
+module.exports = (data) => {
+    assert(data);
+    
+    const {
+        styles,
+        errors,
+    } = new Clean().minify(data);
+    
+    const [error] = errors;
+    
+    if (error)
+        throw error;
+    
+    return styles;
+};
+