react app

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

@@ -0,0 +1,100 @@
+/**
+ * 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 ReactPerf
+ * @typechecks static-only
+ */
+
+'use strict';
+
+/**
+ * ReactPerf is a general AOP system designed to measure performance. This
+ * module only has the hooks: see ReactDefaultPerf for the analysis tool.
+ */
+var ReactPerf = {
+  /**
+   * Boolean to enable/disable measurement. Set to false by default to prevent
+   * accidental logging and perf loss.
+   */
+  enableMeasure: false,
+
+  /**
+   * Holds onto the measure function in use. By default, don't measure
+   * anything, but we'll override this if we inject a measure function.
+   */
+  storedMeasure: _noMeasure,
+
+  /**
+   * @param {object} object
+   * @param {string} objectName
+   * @param {object<string>} methodNames
+   */
+  measureMethods: function(object, objectName, methodNames) {
+    if ("production" !== process.env.NODE_ENV) {
+      for (var key in methodNames) {
+        if (!methodNames.hasOwnProperty(key)) {
+          continue;
+        }
+        object[key] = ReactPerf.measure(
+          objectName,
+          methodNames[key],
+          object[key]
+        );
+      }
+    }
+  },
+
+  /**
+   * Use this to wrap methods you want to measure. Zero overhead in production.
+   *
+   * @param {string} objName
+   * @param {string} fnName
+   * @param {function} func
+   * @return {function}
+   */
+  measure: function(objName, fnName, func) {
+    if ("production" !== process.env.NODE_ENV) {
+      var measuredFunc = null;
+      var wrapper = function() {
+        if (ReactPerf.enableMeasure) {
+          if (!measuredFunc) {
+            measuredFunc = ReactPerf.storedMeasure(objName, fnName, func);
+          }
+          return measuredFunc.apply(this, arguments);
+        }
+        return func.apply(this, arguments);
+      };
+      wrapper.displayName = objName + '_' + fnName;
+      return wrapper;
+    }
+    return func;
+  },
+
+  injection: {
+    /**
+     * @param {function} measure
+     */
+    injectMeasure: function(measure) {
+      ReactPerf.storedMeasure = measure;
+    }
+  }
+};
+
+/**
+ * Simply passes through the measured function, without measuring it.
+ *
+ * @param {string} objName
+ * @param {string} fnName
+ * @param {function} func
+ * @return {function}
+ */
+function _noMeasure(objName, fnName, func) {
+  return func;
+}
+
+module.exports = ReactPerf;