Background Fetch and sync with cache.

[rajasekarm]

Use case

Imagine Data is already fetched and cached, there are few data which is always changing. So if we have an option to return the cached data and trigger a query in the background and sync the data in cache will be useful.

  const { data, isBackgroundSyncing} = useQuery("repoData", () => {}, {backgroundSync: true});

isBackgroundSyncing helps to indicate the user that update is happening in the data.

[tannerlinsley]

You can already do this by setting a staleTime on your query option and using the isFetching property on the resulting query info object.