react app

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

@@ -0,0 +1,47 @@
+/**
+ * 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 ReactComponentWithPureRenderMixin
+*/
+
+'use strict';
+
+var shallowEqual = require("./shallowEqual");
+
+/**
+ * If your React component's render function is "pure", e.g. it will render the
+ * same result given the same props and state, provide this Mixin for a
+ * considerable performance boost.
+ *
+ * Most React components have pure render functions.
+ *
+ * Example:
+ *
+ *   var ReactComponentWithPureRenderMixin =
+ *     require('ReactComponentWithPureRenderMixin');
+ *   React.createClass({
+ *     mixins: [ReactComponentWithPureRenderMixin],
+ *
+ *     render: function() {
+ *       return <div className={this.props.className}>foo</div>;
+ *     }
+ *   });
+ *
+ * Note: This only checks shallow equality for props and state. If these contain
+ * complex data structures this mixin may have false-negatives for deeper
+ * differences. Only mixin to components which have simple props and state, or
+ * use `forceUpdate()` when you know deep data structures have changed.
+ */
+var ReactComponentWithPureRenderMixin = {
+  shouldComponentUpdate: function(nextProps, nextState) {
+    return !shallowEqual(this.props, nextProps) ||
+           !shallowEqual(this.state, nextState);
+  }
+};
+
+module.exports = ReactComponentWithPureRenderMixin;