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diff --git a/node_modules/fbjs/lib/keyOf.js.flow b/node_modules/fbjs/lib/keyOf.js.flow
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+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule keyOf
+ */
+
+/**
+ * Allows extraction of a minified key. Let's the build system minify keys
+ * without losing the ability to dynamically use key strings as values
+ * themselves. Pass in an object with a single key/val pair and it will return
+ * you the string key of that single record. Suppose you want to grab the
+ * value for a key 'className' inside of an object. Key/val minification may
+ * have aliased that key to be 'xa12'. keyOf({className: null}) will return
+ * 'xa12' in that case. Resolve keys you want to use once at startup time, then
+ * reuse those resolutions.
+ */
+var keyOf = function (oneKeyObj) {
+  var key;
+  for (key in oneKeyObj) {
+    if (!oneKeyObj.hasOwnProperty(key)) {
+      continue;
+    }
+    return key;
+  }
+  return null;
+};
+
+module.exports = keyOf;
+\ No newline at end of file