From 0dfcd2bffe65c65f38b71f3462715f220b061430 Mon Sep 17 00:00:00 2001
From: Rafael Weinstein <rafaelw@chromium.org>
Date: Thu, 12 Sep 2013 14:34:37 -0700
Subject: [PATCH] dont assume document on global

---
 src/observe.js | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/observe.js b/src/observe.js
index 918b55c..944de74 100644
--- a/src/observe.js
+++ b/src/observe.js
@@ -37,18 +37,26 @@
 
   var hasObserve = detectObjectObserve();
 
-  // don't test for eval if document has CSP securityPolicy object and we can see that
-  // eval is not supported. This avoids an error message in console even when the exception
-  // is caught
-  var hasEval =  ! ('securityPolicy' in document) || document.securityPolicy.allowsEval;
-  if (hasEval) {
+  function detectEval() {
+    // don't test for eval if document has CSP securityPolicy object and we can see that
+    // eval is not supported. This avoids an error message in console even when the exception
+    // is caught
+    if (global.document &&
+        'securityPolicy' in global.document &&
+        !global.document.securityPolicy.allowsEval) {
+      return false;
+    }
+
     try {
       var f = new Function('', 'return true;');
-      hasEval = f();
+      return f();
     } catch (ex) {
+      return false;
     }
   }
 
+  var hasEval = detectEval();
+
   function isIndex(s) {
     return +s === s >>> 0;
   }