# HeapObjectId

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

Runtime heap object identifier.

```ds title="HeapObjectId"
export newtype HeapObjectId = uint64
```

[language/library/src/runtime/heap.ds:18](https://github.com/destack-sh/destack/blob/main/language/library/src/runtime/heap.ds#L18)