add some babel stuff

node_modules/define-properties/index.js

@@ -0,0 +1,56 @@
+'use strict';
+
+var keys = require('object-keys');
+var foreach = require('foreach');
+var hasSymbols = typeof Symbol === 'function' && typeof Symbol() === 'symbol';
+
+var toStr = Object.prototype.toString;
+
+var isFunction = function (fn) {
+	return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
+};
+
+var arePropertyDescriptorsSupported = function () {
+	var obj = {};
+	try {
+		Object.defineProperty(obj, 'x', { enumerable: false, value: obj });
+        /* eslint-disable no-unused-vars, no-restricted-syntax */
+        for (var _ in obj) { return false; }
+        /* eslint-enable no-unused-vars, no-restricted-syntax */
+		return obj.x === obj;
+	} catch (e) { /* this is IE 8. */
+		return false;
+	}
+};
+var supportsDescriptors = Object.defineProperty && arePropertyDescriptorsSupported();
+
+var defineProperty = function (object, name, value, predicate) {
+	if (name in object && (!isFunction(predicate) || !predicate())) {
+		return;
+	}
+	if (supportsDescriptors) {
+		Object.defineProperty(object, name, {
+			configurable: true,
+			enumerable: false,
+			value: value,
+			writable: true
+		});
+	} else {
+		object[name] = value;
+	}
+};
+
+var defineProperties = function (object, map) {
+	var predicates = arguments.length > 2 ? arguments[2] : {};
+	var props = keys(map);
+	if (hasSymbols) {
+		props = props.concat(Object.getOwnPropertySymbols(map));
+	}
+	foreach(props, function (name) {
+		defineProperty(object, name, map[name], predicates[name]);
+	});
+};
+
+defineProperties.supportsDescriptors = !!supportsDescriptors;
+
+module.exports = defineProperties;