react app

react-app/node_modules/react/lib/cloneWithProps.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.
+ *
+ * @typechecks static-only
+ * @providesModule cloneWithProps
+ */
+
+'use strict';
+
+var ReactElement = require("./ReactElement");
+var ReactPropTransferer = require("./ReactPropTransferer");
+
+var keyOf = require("./keyOf");
+var warning = require("./warning");
+
+var CHILDREN_PROP = keyOf({children: null});
+
+/**
+ * Sometimes you want to change the props of a child passed to you. Usually
+ * this is to add a CSS class.
+ *
+ * @param {ReactElement} child child element you'd like to clone
+ * @param {object} props props you'd like to modify. className and style will be
+ * merged automatically.
+ * @return {ReactElement} a clone of child with props merged in.
+ */
+function cloneWithProps(child, props) {
+  if ("production" !== process.env.NODE_ENV) {
+    ("production" !== process.env.NODE_ENV ? warning(
+      !child.ref,
+      'You are calling cloneWithProps() on a child with a ref. This is ' +
+      'dangerous because you\'re creating a new child which will not be ' +
+      'added as a ref to its parent.'
+    ) : null);
+  }
+
+  var newProps = ReactPropTransferer.mergeProps(props, child.props);
+
+  // Use `child.props.children` if it is provided.
+  if (!newProps.hasOwnProperty(CHILDREN_PROP) &&
+      child.props.hasOwnProperty(CHILDREN_PROP)) {
+    newProps.children = child.props.children;
+  }
+
+  // The current API doesn't retain _owner and _context, which is why this
+  // doesn't use ReactElement.cloneAndReplaceProps.
+  return ReactElement.createElement(child.type, newProps);
+}
+
+module.exports = cloneWithProps;