onError handler ?

[edbras]

How can I set a (global) onError handler/listener such that I am informed about exceptions that occur during tween updates?

Sorry, it might be in the doc's but I couldn't find it.

- Ed

[GreenSock]

There is no such thing as a global onError because:

1. It could significantly slow things down. try/catch blocks are notoriously S-L-O-W.
2. Frankly, I've never needed that, nor has anyone requested it (that I can remember at least). If you're worried about creating tweens that generate errors, it's good to use something like Chrome Dev Tools and watch for them, but honestly they're pretty rare unless you try tweening a non-existent property or a null target, but those would generate errors anyway which you can easily detect in Dev Tools (or similar). 
3. We try very hard to keep the file size to an absolutely minimum, so we don't want to sprinkle a bunch of error-sensing (and responding) code into the core.

You're welcome to add try...catch blocks around the main rendering loops in GSAP, but I really wouldn't recommend that due to the performance penalty. 

[edbras]

Thanks for the clear insight. I wasn't aware of this impact.

Didn't know that try/catch was so slow in JS...