# aggregationFn_uniqueCount

# Variable: aggregationFn\_uniqueCount

```ts
const aggregationFn_uniqueCount: AggregationFnDef<any, any, unknown, number>;
```

Defined in: [features/row-aggregation/aggregationFns.ts:303](https://github.com/TanStack/table/blob/main/packages/table-core/src/features/row-aggregation/aggregationFns.ts#L303)

Counts distinct row values using JavaScript `Set` semantics.