Function select

packages/query-core/src/__tests__/queryObserver.test.tsx:426–429

(data: ReturnType<typeof queryFn>)

    const results: Array<QueryObserverResult> = []
    const queryFn = () => ({ count: 1 })
    const select = (data: ReturnType<typeof queryFn>) => {
      count++
      return { myCount: data.count }
    }
    const observer = new QueryObserver(queryClient, {
      queryKey: key,
      queryFn,