Make sure MutationObserver is used in Safari as well (#488)

* make sure MutationObserver is used in Safari as well * explicitly check for 'undefined' instead of using 'window'
cujojs · Apr 28, 2016 · 8a7785a · 8a7785a
1 parent f9fa814
commit 8a7785a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/lib/env.js b/lib/env.js
@@ -47,8 +47,8 @@ define(function(require) {
 	}
 
 	function hasMutationObserver () {
-		return (typeof MutationObserver === 'function' && MutationObserver) ||
-			(typeof WebKitMutationObserver === 'function' && WebKitMutationObserver);
+	    return (typeof MutationObserver !== 'undefined' && MutationObserver) ||
+			(typeof WebKitMutationObserver !== 'undefined' && WebKitMutationObserver);
 	}
 
 	function initMutationObserver(MutationObserver) {