npm and error messages

node_modules/csso/lib/compressor/compress/Value.js

@@ -0,0 +1,18 @@
+var resolveName = require('../../utils/names.js').property;
+var handlers = {
+    'font': require('./property/font.js'),
+    'font-weight': require('./property/font-weight.js'),
+    'background': require('./property/background.js')
+};
+
+module.exports = function compressValue(node) {
+    if (!this.declaration) {
+        return;
+    }
+
+    var property = resolveName(this.declaration.property.name);
+
+    if (handlers.hasOwnProperty(property.name)) {
+        handlers[property.name](node);
+    }
+};