Provide initialData in queryFn via QueryFunctionContext

[mydesweb]

Would be great to have acces on my initialData in queryFn via QueryFunctionContext, since this function should return a promise that will either resolve data or throw an error.

For example if there are no changes on the server (a 304 status code) I would prefer to simply return my initialData stored in my local db.. and useQuery should know that and not trigger a new render, since there are no actual changes.

[TkDodo]

we inject the client and the queryKey, so you can do:

queryFn: async ({ client, queryKey }) => {
  const response = await makeRequest(queryKey)
  if (is304(response)) {
    return client.getQueryData(queryKey)
  }

  return response.data
}

[mydesweb]

@TkDodo your solution is working as I need. Thank you!