This will be available on our CDN as cdn.ably.io/lib/your-company.min.js for example. It is then your responsibility to proxy that to your own CDN or bundle it in your asset builds.
Please note that references to [a-e].ably-realtime.com will still exist in the library for fallback host support.
Custom domains (CNAME)
Most customers who are interested in our white-label browser libraries also require a custom CNAME domain so that their clients connect to a realtime endpoint that is subdomain of one of their domains. Find out more about custom CNAME domains.