# aggregationFn_count

# Variable: aggregationFn\_count

```ts
const aggregationFn_count: AggregationFn<any, any>;
```

Defined in: [fns/aggregationFns.ts:234](https://github.com/TanStack/table/blob/main/packages/table-core/src/fns/aggregationFns.ts#L234)

Counts the number of leaf rows in the group.

The column id is ignored because the result is based only on group size.