# edge

`import { edge } from "destack:topology";`

Mark a declaration as a topology edge.

```ds title="edge"
export newtype edge<T = unknown> = EdgeOptions<T>
```

[language/library/src/topology/decorator.ds:37](https://github.com/destack-sh/destack/blob/main/language/library/src/topology/decorator.ds#L37)