I've been working on something similar as a side project. A serverless Discord Bot solution that runs a custom made SDK. We take a very similar approach to Cloudflare Workers where we run user's applications in v8 isolates.

I'm the only person working on this, and mostly in my spare time, but check it out: https://pylon.bot/

Here's the SDK docs so you can see the breadth of what's possible:

- https://pylon.bot/docs/intro - https://pylon.bot/docs/reference/index.html

We're still in beta, but a lot of people are using the bot today. One thing that's great is that you can rapidly iterate on your code without "restarting" the bot because of how the infrastructure is set up. Deploy of your script takes less than a second. And, we support more than just what appears to be registering a single slash command :P