Fix.

node_modules/is-data-descriptor/index.js

@@ -0,0 +1,55 @@
+/*!
+ * is-data-descriptor <https://github.com/jonschlinkert/is-data-descriptor>
+ *
+ * Copyright (c) 2015, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+'use strict';
+
+var typeOf = require('kind-of');
+
+// data descriptor properties
+var data = {
+  configurable: 'boolean',
+  enumerable: 'boolean',
+  writable: 'boolean'
+};
+
+function isDataDescriptor(obj, prop) {
+  if (typeOf(obj) !== 'object') {
+    return false;
+  }
+
+  if (typeof prop === 'string') {
+    var val = Object.getOwnPropertyDescriptor(obj, prop);
+    return typeof val !== 'undefined';
+  }
+
+  if (!('value' in obj) && !('writable' in obj)) {
+    return false;
+  }
+
+  for (var key in obj) {
+    if (key === 'value') continue;
+
+    if (!data.hasOwnProperty(key)) {
+      continue;
+    }
+
+    if (typeOf(obj[key]) === data[key]) {
+      continue;
+    }
+
+    if (typeof obj[key] !== 'undefined') {
+      return false;
+    }
+  }
+  return true;
+}
+
+/**
+ * Expose `isDataDescriptor`
+ */
+
+module.exports = isDataDescriptor;