install gulp

user/themes/anissabensalah/node_modules/es5-ext/object/keys/implement.js

@@ -0,0 +1,8 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(Object, "keys", { value: require("./shim"),
+		configurable: true,
+enumerable: false,
+writable: true });
+}

user/themes/anissabensalah/node_modules/es5-ext/object/keys/index.js

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

user/themes/anissabensalah/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;
+}
+};

user/themes/anissabensalah/node_modules/es5-ext/object/keys/shim.js

@@ -0,0 +1,9 @@
+"use strict";
+
+var isValue = require("../is-value");
+
+var keys = Object.keys;
+
+module.exports = function (object) {
+	return keys(isValue(object) ? Object(object) : object);
+};