react app

react-app/node_modules/react/lib/getReactRootElementInContainer.js

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+/**
+ * Copyright 2013-2015, 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 getReactRootElementInContainer
+ */
+
+'use strict';
+
+var DOC_NODE_TYPE = 9;
+
+/**
+ * @param {DOMElement|DOMDocument} container DOM element that may contain
+ *                                           a React component
+ * @return {?*} DOM element that may have the reactRoot ID, or null.
+ */
+function getReactRootElementInContainer(container) {
+  if (!container) {
+    return null;
+  }
+
+  if (container.nodeType === DOC_NODE_TYPE) {
+    return container.documentElement;
+  } else {
+    return container.firstChild;
+  }
+}
+
+module.exports = getReactRootElementInContainer;