Assuming I did bring in an 80mb js library into a web app wouldn't there be something in the build process that removes unreachable code? I mostly have backend

Assuming I did bring in an 80mb js library into a web app wouldn't there be something in the build process that removes unreachable code? I mostly have backend and mobile experience with only a little frontend experience. But I agree many modern pages are way larger then they really need to be.