tanstack

# TanStack Match the task to one or more Branches rows and read every listed file **in full** before producing output — those references are the contract; the tripwires below are only a final self-check. ## Branches | When you are… | Read in full | | --- | --- | | Defining or changing query keys / factories | `references/query-keys.md` | | Setting staleTime, gcTime, invalidation, placeholder/initial data | `references/query-caching.md` | | Writing mutations, optimistic updates, or mutation state | `references/query-mutations.md` | | Prefetching, parallel queries, infinite queries, or cancellation | `references/query-fetch-patterns.md` | | SSR dehydrate/hydrate, offline networkMode, or query persistence | `references/query-ssr-offline.md` | | Query error boundaries or select/performance | `references/query-errors-performance.md` | | Registering the router, `from` typing, virtual routes, or router defaults | `references/router-type-and-org.md` | | Route loaders, ensureQueryData, or parallel route loading | `references/router-data-loading.md` | | Search params, Link/navigate, route masks, or preload | `references/router-search-nav.md` | | Lazy routes, not-found, route context, or auth beforeLoad | `references/router-split-errors-context.md` | | TanStack Form hooks, Zod validators, or field components | `references/form.md` | *Done when:* every matched reference was read, the change follows its patterns, and no tripwire is violated. ## Tripwires **Query** — array keys that include every dependency; invalidate (or optimistically update with rollback) after mutations; never put non-serializable values in keys. **Router** — register the router type; validate search with defaults (`.catch()`); use `ensureQueryData` in loaders when pairing with Query; `throw redirect(...)` not `return`. **Form** — complete `defaultValues` for inference; Zod at form/field level; debounce async validators (≥500ms); `role="alert"` on field errors; `preventDefault` on submit.