# FrameSlotId

`import { FrameSlotId } from "destack:runtime";`

Runtime frame slot identifier.

```ds title="FrameSlotId"
export newtype FrameSlotId = uint32
```

[language/library/src/runtime/frame.ds:43](https://github.com/destack-sh/destack/blob/main/language/library/src/runtime/frame.ds#L43)