From a21979404c93d5e548ebe6e372e4c80b0eacf625 Mon Sep 17 00:00:00 2001
From: cpojer <christoph.pojer@gmail.com>
Date: Tue, 4 Feb 2014 15:09:41 -0800
Subject: [PATCH] Add canUseEventListeners to ExecutionEnvironment.

---
 src/vendor/core/ExecutionEnvironment.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/vendor/core/ExecutionEnvironment.js b/src/vendor/core/ExecutionEnvironment.js
index e03557cbe6..6ab8715d8d 100644
--- a/src/vendor/core/ExecutionEnvironment.js
+++ b/src/vendor/core/ExecutionEnvironment.js
@@ -34,6 +34,9 @@ var ExecutionEnvironment = {
 
   canUseWorkers: typeof Worker !== 'undefined',
 
+  canUseEventListeners:
+    canUseDOM && (window.addEventListener || window.attachEvent),
+
   isInWorker: !canUseDOM // For now, this is true - might change in the future.
 
 };