I am NOT interested in error boundaries (which are client-side only), error responses from API routes, or anything like that
I'm fine with an answer involving implementation details that might break tomorrow
I want to format specific kinds of uncaught exceptions that happen either in the pure node context or the RSC rendering context using my own custom JavaScript code. I want to be able to break on these errors by introducing a debugger statement.

In other words, I want to run code wherever nextjs processes exceptions. As far as I can tell, nextjs does not have this kind of feature.

In almost all cases, there is a function I can overwrite for doing this, like a function for internal exception formatting. Or maybe there is an (undocumented?) event I can listen to. If all else fails I can edit the source code somewhere. My question is where.

Alternatively, if I've missed this feature, please point me towards the documentation.