Flag to prevent registration of events facebook#954

Flag on EventPluginHub to disable event registration.
For the purposes of server side rendering not registering events.
Could be cleaner if used a transaction with an optional step.
Alternatively could be an ExecutionEnvironment variable.
Could also be flag passed to mount component, however non DOM
components have no comprehension of events.

src/environment/ReactServerRendering.js

@@ -22,6 +22,8 @@ var ReactComponent = require('ReactComponent');
 var ReactInstanceHandles = require('ReactInstanceHandles');
 var ReactMarkupChecksum = require('ReactMarkupChecksum');
 var ReactReconcileTransaction = require('ReactReconcileTransaction');
+var ExecutionEnvironment = require('ExecutionEnvironment');
+var EventPluginHub = require('EventPluginHub');
 
 var invariant = require('invariant');
 
@@ -48,7 +50,10 @@ function renderComponentToString(component, callback) {
   transaction.reinitializeTransaction();
   try {
     transaction.perform(function() {
+      var registrationEnabled = EventPluginHub.isRegistrationEnabled();
+      EventPluginHub.setRegistrationEnabled(false);
       var markup = component.mountComponent(id, transaction, 0);
+      EventPluginHub.setRegistrationEnabled(registrationEnabled);
       markup = ReactMarkupChecksum.addChecksumToMarkup(markup);
       callback(markup);
     }, null);

src/event/EventPluginHub.js

@@ -31,6 +31,11 @@ var isEventSupported = require('isEventSupported');
  */
 var listenerBank = {};
 
+/**
+ *  Allow disabling listener registration
+ */
+var registrationEnabled = true;
+
 /**
  * Internal queue of events that have accumulated their dispatches and are
  * waiting to have their dispatches executed.
@@ -98,6 +103,14 @@ function validateInstanceHandle() {
  */
 var EventPluginHub = {
 
+  setRegistrationEnabled: function(enabled) {
+    registrationEnabled = enabled;
+  },
+
+  isRegistrationEnabled: function() {
+    return registrationEnabled;
+  },
+
   /**
    * Methods for injecting dependencies.
    */
@@ -158,9 +171,11 @@ var EventPluginHub = {
         console.warn('This browser doesn\'t support the `onScroll` event');
       }
     }
-    var bankForRegistrationName =
-      listenerBank[registrationName] || (listenerBank[registrationName] = {});
-    bankForRegistrationName[id] = listener;
+    if(registrationEnabled) {
+      var bankForRegistrationName =
+        listenerBank[registrationName] || (listenerBank[registrationName] = {});
+      bankForRegistrationName[id] = listener;
+    }
   },
 
   /**