So siehts ganz gut aus !

node_modules/es5-ext/string/#/contains/shim.js

@@ -0,0 +1,7 @@
+"use strict";
+
+var indexOf = String.prototype.indexOf;
+
+module.exports = function (searchString/*, position*/) {
+	return indexOf.call(this, searchString, arguments[1]) > -1;
+};