From fc9c595dbbd51bd5d9880c150ff0bb0f1a1af54b Mon Sep 17 00:00:00 2001
From: Devin Rhode <devinrhode2@gmail.com>
Date: Tue, 16 Jul 2013 14:10:12 -0700
Subject: [PATCH 1/3] Allow an old onerror function to tell TraceKit to not
 notify handlers

Hopefully no build errors this time :)
---
 tracekit.js | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/tracekit.js b/tracekit.js
index 78bb33b..554b0f4 100644
--- a/tracekit.js
+++ b/tracekit.js
@@ -180,10 +180,17 @@ TraceKit.report = (function reportModuleWrapper() {
             };
         }
 
-        notifyHandlers(stack, 'from window.onerror');
-
         if (_oldOnerrorHandler) {
-            return _oldOnerrorHandler.apply(this, arguments);
+            var _oldOnerrorReturn = _oldOnerrorHandler.apply(this, arguments);
+            
+            // if there is no return value or that return value has notifyHandlers set to something truthy, notifyHandlers
+            if (!_oldOnerrorReturn || _oldOnerrorReturn.notifyHandlers) {
+                notifyHandlers(stack, 'from window.onerror');
+            }
+
+            return _oldOnerrorReturn; // preserve any potential return behavior of the old onerror function.
+        } else {
+            notifyHandlers(stack, 'from window.onerror');
         }
 
         return false;

From bad90312d0de524ed997641bbcb2bfdf317388ac Mon Sep 17 00:00:00 2001
From: Devin Rhode <devinrhode2@gmail.com>
Date: Tue, 16 Jul 2013 14:14:44 -0700
Subject: [PATCH 2/3] Docs for letting an old onerror function tell TraceKit to
 not notify handlers

---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index 7d5aac0..5d97c22 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,11 @@ You can also tell TraceKit to ignore global window errors with:
 TraceKit.collectWindowErrors = false;
 ```
 
+### Existing `window.onerror` function?
+
+TraceKit installs it's own window.onerror function, but your will still get called normally.
+If you don't want TraceKit to notify subscribers, then `return {notifyHandlers: false};` from your window.onerror function.
+
 View the source for more details and examples.
 
 ![Stacktrace or GTFO](http://i.imgur.com/jacoj.jpg)

From dd6d425608495ae1db5710384476954d410c6b4e Mon Sep 17 00:00:00 2001
From: Devin Rhode <devinrhode2@gmail.com>
Date: Tue, 16 Jul 2013 14:17:38 -0700
Subject: [PATCH 3/3] typo

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 5d97c22..719e5ac 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ TraceKit.collectWindowErrors = false;
 
 ### Existing `window.onerror` function?
 
-TraceKit installs it's own window.onerror function, but your will still get called normally.
+TraceKit installs it's own window.onerror function, but yours will still get called normally.
 If you don't want TraceKit to notify subscribers, then `return {notifyHandlers: false};` from your window.onerror function.
 
 View the source for more details and examples.