So siehts ganz gut aus !

node_modules/es5-ext/object/keys/implement.js

@@ -0,0 +1,10 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(Object, "keys", {
+		value: require("./shim"),
+		configurable: true,
+		enumerable: false,
+		writable: true
+	});
+}

node_modules/es5-ext/object/keys/index.js

@@ -0,0 +1,3 @@
+"use strict";
+
+module.exports = require("./is-implemented")() ? Object.keys : require("./shim");

node_modules/es5-ext/object/keys/is-implemented.js

@@ -0,0 +1,10 @@
+"use strict";
+
+module.exports = function () {
+	try {
+		Object.keys("primitive");
+		return true;
+	} catch (e) {
+		return false;
+	}
+};

node_modules/es5-ext/object/keys/shim.js

@@ -0,0 +1,7 @@
+"use strict";
+
+var isValue = require("../is-value");
+
+var keys = Object.keys;
+
+module.exports = function (object) { return keys(isValue(object) ? Object(object) : object); };