npm and error messages

node_modules/csso/lib/compressor/clean/Identifier.js

@@ -0,0 +1,9 @@
+module.exports = function cleanIdentifier(node, item, list) {
+    // remove useless universal selector
+    if (this.selector !== null && node.name === '*') {
+        // remove when universal selector isn't last
+        if (item.next && item.next.data.type !== 'Combinator') {
+            list.remove(item);
+        }
+    }
+};