Method trackResult

packages/query-core/src/queryObserver.ts:331–342

* Wraps a `QueryObserverResult` in a `Proxy` that records which properties are read, via * QueryObserver#trackProp (and an optional `onPropTracked` callback). Used by framework * adapters when `notifyOnChangeProps` is not set, to implement its default "only re-render on * properties

(
    result: QueryObserverResult<TData, TError>,
    onPropTracked?: (key: keyof QueryObserverResult) => void,
  )

   * properties you actually read" behavior.
   */
  trackResult(
    result: QueryObserverResult<TData, TError>,
    onPropTracked?: (key: keyof QueryObserverResult) => void,
  ): QueryObserverResult<TData, TError> {
    return new Proxy(result, {
      get: (target, key) => {
        this.trackProp(key as keyof QueryObserverResult)
        onPropTracked?.(key as keyof QueryObserverResult)
        return Reflect.get(target, key)
      },
    })
  }

  /**
   * Records that the given `QueryObserverResult` property was read, so a subsequent update only