> ## Documentation Index
> Fetch the complete documentation index at: https://bunnynet-cb9733c2-burrow-origin-shield.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Runtime

> The runtime APIs available on the bunny.net platform.

## Runtime

The bunny.net EdgeScript Runtime is based on Deno, so you can use a subset of what
is available from Deno or Node. Given the environment where we run
EdgeScripts, we also provide functions you can use to alter the behavior of
the script or bind to other bunny.net Services.

### waitUntil

The `waitUntil` function allows you to extend the duration of the isolate
running a request. It can be useful when you want a script to continue doing
work after the request it answered has finished. Even if no other requests are
being routed to this script, it will extend the duration of this script
invocation.

It can be quite useful if you want to maintain [WebSocket](./websockets)
connections.

<Note>
  You can call `waitUntil` multiple times; the script will only be evicted once
  every given promise has been resolved.
</Note>

## References

* [WebSocket](./websockets)