Audience question: can you package a Rails engine that uses Webpacker, and can the host app also have Webpacker? Adrian: yes, Avo used to do this. You can hook into the host's asset pipeline for dev, and still pre-compile in production/build time to ship compiled assets. It's not easy — you have to add some middleware to hook into Webpacker — but it's doable, and he can share the code.