Get registered variables (that are currently set)

Rel #1

vars/registered.js

@@ -0,0 +1,35 @@
+export default function compute() {
+
+function walkElements(node, callback) {
+	if (Array.isArray(node)) {
+		for (let n of node) {
+			walkElements(n, callback);
+		}
+	}
+	else {
+		callback(node);
+
+		if (node.children) {
+			walkElements(node.children, callback);
+		}
+	}
+}
+
+let ret = new Set();
+
+walkElements(vars.computed, node => {
+	if (node.declarations) {
+		for (let property in node.declarations) {
+			let value;
+			let o = node.declarations[property];
+
+			if (property.startsWith("--") && o.type) {
+				ret.add(property);
+			}
+		}
+	}
+});
+
+return [...ret];
+
+}

vars/root.js

@@ -24,7 +24,6 @@ let ret = {
 walkElements(vars.computed, node => {
 	if (node.declarations) {
 		for (let property in node.declarations) {
-			let value;
 			let o = node.declarations[property];
 
 			if (property.startsWith("--")) {