react app

react-app/node_modules/react/lib/flattenChildren.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 flattenChildren
+ */
+
+'use strict';
+
+var traverseAllChildren = require("./traverseAllChildren");
+var warning = require("./warning");
+
+/**
+ * @param {function} traverseContext Context passed through traversal.
+ * @param {?ReactComponent} child React child component.
+ * @param {!string} name String name of key path to child.
+ */
+function flattenSingleChildIntoContext(traverseContext, child, name) {
+  // We found a component instance.
+  var result = traverseContext;
+  var keyUnique = !result.hasOwnProperty(name);
+  if ("production" !== process.env.NODE_ENV) {
+    ("production" !== process.env.NODE_ENV ? warning(
+      keyUnique,
+      'flattenChildren(...): Encountered two children with the same key, ' +
+      '`%s`. Child keys must be unique; when two children share a key, only ' +
+      'the first child will be used.',
+      name
+    ) : null);
+  }
+  if (keyUnique && child != null) {
+    result[name] = child;
+  }
+}
+
+/**
+ * Flattens children that are typically specified as `props.children`. Any null
+ * children will not be included in the resulting object.
+ * @return {!object} flattened children keyed by name.
+ */
+function flattenChildren(children) {
+  if (children == null) {
+    return children;
+  }
+  var result = {};
+  traverseAllChildren(children, flattenSingleChildIntoContext, result);
+  return result;
+}
+
+module.exports = flattenChildren;