Since Deno has been released stable build just a few days ago, Is there a possible way to use firebase-admin with Deno?
At the time of this post, both Google documentation and Firebase repositories have no Deno support.
https://firebase.google.com/docs/admin/setup
https://github.com/firebase?q=firebase-admin
Maybe they are already working on it, I can't know. You can reach out to them and do a feature request and ask how you can help.