# TreeGrid.isExpanded

Tests membership in expandedIds without touching the DOM; this is the Tree helper exposed from
the TreeGrid entrypoint.

## Signatures

```ts
export declare const isExpanded: typeof Tree.isExpanded;
```



## Examples

```ts
import * as TreeGrid from "@typed/ui/TreeGrid";

const expanded = TreeGrid.isExpanded({ activeId: null, expandedIds: ["parent"], loop: true }, "parent");
```