update

node_modules/postcss-values-parser/lib/function.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const Container = require('./container');
+
+class FunctionNode extends Container {
+  constructor (opts) {
+    super(opts);
+    this.type = 'func';
+    // start off at -1 so we know there haven't been any parens added
+    this.unbalanced = -1;
+  }
+};
+
+Container.registerWalker(FunctionNode);
+
+module.exports = FunctionNode;