How to understand what is not needed in bundle.js?

Question

JavaScript

I always order adaptive layout on freelance.
But this time I was given an adaptive layout of only 5 html pages with bundle.js, which is not only obfuscated, but also hangs 2.6mb.

How can it be reduced? as I understand it, he assembled a webpack with just everything that is possible and 90% of it is not used in layout from there?
ps I never worked with vp, I always got a ready-made layout, the maximum bundle hung 300-400kb, and then bang 2.6mb.
Briefly explain, if possible, how to cut out everything unnecessary from it?

Answer 1

To figure out what he stuffed there, you need the source code, since the bundle is equivalent to a binary, it is impossible to work with it, this is the final product. And webpack has nothing to do with it, it's a great tool. Yes, it slightly increases the size of the script, but this is not significant. So look for the sources and see what modules are present in them