module-server

I'm reminded of https://github.com/google/module-server/blob/master/README.m... from a (linked) 2012 presentation. I believe I found it in 2013, there might be other more recent talks. If I recall, the unique feature of the proposed Google loader was that it would dynamically take into consideration a dependency graph of the next JS to load and serve up just enough to show whatever page you needed, and if the next page in the graph had different dependencies, it would load just the ones you didn't already have. Can't remember the details right now, it's been a few years. Made tremendous sense at the time, but the implementation might need to be improved a bit given HTTP/2 and more modern JS loaders, including a WhatWG spec.

Yeah, there is a bit of an overhead with that. Module server - https://github.com/google/module-server seems like quite a good solution. Though I'd agree, for a large number of sites it's far better to bundle them up.