Izmjenjena struktura, dodan backand

web/node_modules/fbjs/lib/joinClasses.js.flow

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+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule joinClasses
+ * @typechecks static-only
+ */
+
+'use strict';
+
+/**
+ * Combines multiple className strings into one.
+ * http://jsperf.com/joinclasses-args-vs-array
+ *
+ * @param {...?string} className
+ * @return {string}
+ */
+
+function joinClasses(className /*, ... */) {
+  if (!className) {
+    className = '';
+  }
+  let nextClass;
+  const argLength = arguments.length;
+  if (argLength > 1) {
+    for (let ii = 1; ii < argLength; ii++) {
+      nextClass = arguments[ii];
+      if (nextClass) {
+        className = (className ? className + ' ' : '') + nextClass;
+      }
+    }
+  }
+  return className;
+}
+
+module.exports = joinClasses;