So siehts ganz gut aus !

node_modules/es5-ext/string/#/starts-with/implement.js

@@ -0,0 +1,9 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(String.prototype, "startsWith",
+		{ value: require("./shim"),
+configurable: true,
+enumerable: false,
+			writable: true });
+}

node_modules/es5-ext/string/#/starts-with/index.js

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = require("./is-implemented")()
+	? String.prototype.startsWith
+	: require("./shim");

node_modules/es5-ext/string/#/starts-with/is-implemented.js

@@ -0,0 +1,9 @@
+"use strict";
+
+var str = "razdwatrzy";
+
+module.exports = function () {
+	if (typeof str.startsWith !== "function") return false;
+	return (str.startsWith("trzy") === false) &&
+		(str.startsWith("raz") === true);
+};

node_modules/es5-ext/string/#/starts-with/shim.js

@@ -0,0 +1,12 @@
+"use strict";
+
+var value     = require("../../../object/valid-value")
+  , toInteger = require("../../../number/to-integer")
+
+  , max = Math.max, min = Math.min;
+
+module.exports = function (searchString/*, position*/) {
+	var start, self = String(value(this));
+	start = min(max(toInteger(arguments[1]), 0), self.length);
+	return self.indexOf(searchString, start) === start;
+};