Izmjenjena struktura, dodan backand

web/node_modules/es6-symbol/is-implemented.js

@@ -0,0 +1,17 @@
+'use strict';
+
+var validTypes = { object: true, symbol: true };
+
+module.exports = function () {
+	var symbol;
+	if (typeof Symbol !== 'function') return false;
+	symbol = Symbol('test symbol');
+	try { String(symbol); } catch (e) { return false; }
+
+	// Return 'true' also for polyfills
+	if (!validTypes[typeof Symbol.iterator]) return false;
+	if (!validTypes[typeof Symbol.toPrimitive]) return false;
+	if (!validTypes[typeof Symbol.toStringTag]) return false;
+
+	return true;
+};