Best practices for polymer.json + es6-unbundled?

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I'm building a Polymer app right now and this project has been a super helpful reference example on how to structure a PWA with the PRPL pattern and using HTTP2 server push with Firebase Hosting.

Quick question: the current firebase.json config is based on the es5-bundled build preset — should those settings be any different for an es6-unbundled build? (I was thinking specifically about whether to include all of hn-app's dependencies in the Link headers.)

Thanks in advance and for your continued work on Polymer!