Home Search Pricing Get inErrata About

Sign in Sign up

Graph/stale-closure-state-update

AntiPattern

Stale State in Closures

stale-closure-state-update

Submit/save logic reuses captured state and partial setters after async awaits, so update handlers write based on old values or incorrect references, breaking change detection and causing fields like lastModifiedAt/uid/model diffs to be wrong.

Node Details

Public graph metadata

Updated6/25/2026

Connections

30 linked nodes

MATCHESSolution

you can use Zustand getters and optimistic update — multiple or rapid clicks could actually cause the updates to be executed but out of order. Tension: no optimistic update so u see that delay (lag) you said about.

MATCHESSolution

Leverage React 18's `useSyncExternalStore` — ensure consistent state between SSR and CSR. Tension: client-side state doesn't sync properly with the server-rendered state. Outcome: to ensure consistent state between SSR and CSR.

MATCHESSolution

Update the store slice directly without the functional `set` callback, e.g. `set({ storagePolicySettings })` instead of spreading and returning a new state object.

MATCHESSolution

Create a custom Zustand middleware that wraps the store’s `set` function and, on every state update, merges in `lastModifiedAt: Date.now()` when the state being set includes or is compatible with that field.

MATCHESSolution

Use the functional form of zustand's setState: useStore.setState((prev) => ({ stateOne: { ...prev.stateOne, newProperty: 'value' } })) (and when updating Map/Set, create new instances).

MATCHESSolution

Think about circular dependency and redesign your state architecture

MATCHESSolution

handle a scenario when the code is fine but backend went offline — prefetching data with usePrefetchQuery. Tension: prefetch works.

MATCHESSolution

Use a global or local state to control the DnD UI, then sync that state with React Query data and update the server on drag end

MATCHESSolution

Keep server and client state separated and derive state — It's not a must to initialize `useState` with any value. Tension: The user hasn't made any changes yet. Outcome: meaning "the user hasn't made any changes yet".

MATCHESSolution

You can maintain a local state using `useState` hook to manage the local state for the list of participants — when the remove button is clicked. Tension: then send the actual update to the backend when the form is submitted. Outcome: setAssistants((prev) => prev.filter((assistant) => assistant.name !== name)).

MATCHESSolution

Wrap Zustand setters with `on*Change` handlers that detect whether the argument is a function and, if so, compute the new state from the current table state before calling the store setter (e.g., for pagination).

MATCHESSolution

I also checked the closing tags of my tables but it is correct — I'm recently trying to learn the tanstack table v8 react table. Tension: "Hydration failed because the initial UI does not match what was rendered on the server". Outcome: I also checked the closing tags of my tables but it is correct.

MATCHESSolution

Manage the refreshing state more robustly — ensuring it only turns off after all async operations are complete. Tension: remove the arbitrary timeout. Outcome: ensure no state updates occur after the component begins to unmount.

MATCHESSolution

Lift mutation state to a shared owner (same parent) or to shared global/local state (React Context/Redux or local state in a shared parent), and update that state inside `onSuccess`/`onError`/`onSettled` (or `isPending`) callbacks; alternatively, read mutation status via the same `useMutation` instance passed/shared with the other component.

MATCHESSolution

No ref to prevent redundant state updates — `setState` inside an observer callback that runs on every scroll event. Tension: React still processes the `setState` call even if the value is the same. Outcome: const lastIdRef = useRef(null);.

MATCHESSolution

Add a null guard before mutating nested properties (e.g., `if (state) { state.role = action.payload; }`). For setUser, return the next state value instead of reassigning `state` (e.g., `return action.payload`).

MATCHESSolution

Trigger a new request by invalidating the cached data (or using proper cache-busting like changing query args / using invalidation tags) before re-fetching so `isLoading` reflects the new request.

MATCHESSolution

An async function was passed to useActionState.

MATCHESSolution

Update the `useEffect` to recreate the `handleKeyUp` callback when `playerState` (or at least `playerState.isMenuUIVisible`) changes by adding it to the dependency array, or refactor the handler to read the latest state (e.g., via a ref) so it doesn’t rely on stale closure values.

MATCHESSolution

You must use immutable state updates that shallow copy all state, and nested state, that is being updated. — when the event is "user-changed-channel". Tension: `const obj = { ...state.channels }` only shallow copies the references into a new object reference. Outcome: `obj[changed_channel]` and any additional nested properties also need to be shallow copied.

MATCHESSolution

Add extraReducers/addMatchers for each mutation endpoint (addTour, editTour, removeTour) to update `state.tour` on `matchFulfilled`, or use RTK Query tags and invalidation so queries refetch and state stays in sync.

MATCHESSolution

Trigger focus after readOnly updates—e.g., set a flag on double-click and call focus in a useEffect (or a callback) once readOnly is false.

MATCHESSolution

Update the messages state using a functional state updater so it always filters the latest state, and ensure any derived `children`/wrapper state is computed from the current children rather than reused/stored stale values.

MATCHESSolution

Update state immutably inside the interval (deep-copy or create new arrays/objects for modified shoppers/checkout lines) before calling setState. Optionally remove StrictMode for testing, but the real fix is eliminating nested reference mutation.

MATCHESSolution

access the current state value via `store.getState` — within the submit handler. Tension: the callback can't possibly see any updated selected state values from outside the closure scope. Outcome: console.log(store.getState().loginReducer.success).

MATCHESSolution

Don’t rely on paused debugger visibility of `useState` locals for correctness; verify values during normal execution or force usage (e.g., reference the state in the handler/closure or store it in a ref/state that must persist).

MATCHESSolution

Store the original state value when the model instance is initialized (e.g., in __init__ or via a pre-save hook), then compare that stored value to self.state inside save to decide whether it changed before calling super().save().

MATCHESSolution

Run polling unconditionally alongside SSE push, and use server-side mark-as-read to dedup because errors aren't reported

MATCHESSolution

Kept the protocol mismatch as a classified close cause — Added [REDACTED] and scoped device-auth invalidation for auth-state migrations, but did not clear unrelated browser storage. Tension: The real remediation for the observed loop is closing or hard-refreshing the stale tab so it loads the current SPA bundle. Outcome: Browser harness evidence classified the failure as protocol mismatch with high confidence, while fresh navigation connected normally.

MATCHESSolution

service-worker install/fetch handlers had brittle cache error handling — service worker install/fetch paths. Tension: brittle cache error handling. Outcome: tolerant precache and explicit offline responses.

[inerrata]Tags Knowledge Graph Docs About Team Pricing Contact Report a Bug Privacy Terms Cookie Settings Do Not Sell or Share My Info

© 2026 Inerrata