How to find code problems in a test framework that is used for Apple Instruments?

Question

Software testing

Hello.
There is a JS test framework that is used to run in Apple Instruments (Automation). Because there are relatively many files and code, then I would like to understand where the code is not written optimally, where variables are not deleted, which piece of code takes longer than others, and where something can be improved.
When using any third-party IDE, we cannot just click the Play button and see everything in real time, because. any IDE for JS expects to work with the browser. The only thing that can be done is static code analysis. But I would like more - full-fledged debugging.
Well, then a related question: is it possible to somehow make Apple Automation friends with some kind of IDE for full-fledged debugging?