Tracking down javascript errors is still very outdated even though it is considered to be the lingua franca of the internet. Having a ton of experience in debugging javascript codebase ranging from small client side code to large scale node.js applications I know how frustrating it can get when you're trying to figure out what's wrong with a piece of code or why the error message isn't making any sense at all.
I am here to help you fix it and keeping you from pulling your hair. So if you need an extra pair of eyes that has seen a lot of errors and seen how to overcome those with efficient solutions, get in touch.