Function isStale

packages/query-core/src/queryObserver.ts:784–792

(
  query: Query<any, any, any, any>,
  options: QueryObserverOptions<any, any, any, any, any>,
)

}

function isStale(
  query: Query<any, any, any, any>,
  options: QueryObserverOptions<any, any, any, any, any>,
): boolean {
  return (
    resolveQueryBoolean(options.enabled, query) !== false &&
    query.isStaleByTime(resolveStaleTime(options.staleTime, query))
  )
}

// this function would decide if we will update the observer's 'current'
// properties after an optimistic reading via getOptimisticResult