npm and error messages

node_modules/es5-ext/array/#/@@iterator/is-implemented.js

@@ -0,0 +1,16 @@
+"use strict";
+
+var iteratorSymbol = require("es6-symbol").iterator;
+
+module.exports = function () {
+	var arr = ["foo", 1], iterator, result;
+	if (typeof arr[iteratorSymbol] !== "function") return false;
+	iterator = arr[iteratorSymbol]();
+	if (!iterator) return false;
+	if (typeof iterator.next !== "function") return false;
+	result = iterator.next();
+	if (!result) return false;
+	if (result.value !== "foo") return false;
+	if (result.done !== false) return false;
+	return true;
+};