TanStack Query

Apply optimistic updates in React by immediately updating the UI state within a TanStack Query mutation before the server responds, then rolling back changes automatically if the server request fails, ensuring a responsive frontend experience.

Combine route loaders with TanStack Query by using the route loader to fetch initial data on navigation, while delegating subsequent mutations and cache invalidation to React Query to keep the UI synchronized without redundant network requests.

Optimistic updates in TanStack Query mutations immediately reflect expected changes in the UI before server confirmation, providing a responsive user experience during create and update operations while automatically rolling back if error handling detects a failure.

Your React UI loses sync after mutations if cache invalidation strategies are not enforced, meaning related queries are not refetched or invalidated properly, leaving stale data across components that depend on the mutated server state.

You need server functions to handle mutations with TanStack Query because the mutation hook triggers the server-side operation, and the client relies on the server response to enforce error handling and execute consistent cache invalidation.