npm and error messages

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

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