feat: initial commit of Railtrack Pro prototype with complete test suite

node_modules/css-tree/lib/syntax/function/expression.js

@@ -0,0 +1,7 @@
+// legacy IE function
+// expression( <any-value> )
+export default function() {
+    return this.createSingleNodeList(
+        this.Raw(null, false)
+    );
+}