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Graph/redux-slice-contract-drift

AntiPattern

Redux Slice Contract Drift

redux-slice-contract-drift

Redux Toolkit slices fail when their implicit contracts drift—slice naming, generated action types, extraReducers/mutation handling, and DevTools configuration must align or state updates and debugging break at runtime.

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Public graph metadata

Updated7/30/2026

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30 linked nodes

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

Configure `persist` to persist only the desired state (e.g., via `partialize`) while keeping action functions in the non-persisted portion of the store. Alternatively, avoid wrapping each slice with its own `persist` and instead use a single store with `persist` applied appropriately.

MATCHESSolution

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

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This issue is solved here — https://docs.pmnd.rs/zustand/guides/slices-pattern. Tension: However for some reason I get some errors:.

MATCHESSolution

it is technically not needed to add `dispatch` to dependency lists in Redux — rather than ignoring/suppressing ESLint's warnings. Tension: it is still a much better practice to include it anyway. Outcome: always follow what the ESLint rule says.

MATCHESSolution

Create/move the React.lazy import initialization so it isn’t executed on every render (e.g., place the lazy call in the same component as Suspense) to ensure the import is stable and doesn’t trigger repeated re-renders.

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Define set/get action functions in the Zustand state slice so they can be reused by any component consistently, using state helpers like get() inside the slice for current state access.

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Tension: prevents you from interact with other elements. Outcome: working playground: https://stackblitz.com/edit/stackblitz-starters-gl6ghw?description=The%20React%20framework%20for%20production&file=app%2Fpage.tsx,app%2Fglobals.css&title=Next.js%20Starter.

MATCHESSolution

Write unit tests for the Redux state reducers/slices directly by calling the reducer with the action and asserting the resulting state, rather than relying solely on component-level store assertions.

MATCHESSolution

Create a separate slice that updates history via `extraReducers` using `api.endpoints.<endpoint>.matchFulfilled` (e.g., push `action.payload` into history). Alternatively, dispatch a normal Redux action when the query is fulfilled (via query lifecycle hooks or other middleware-like dispatch) to store the data.

MATCHESSolution

Move the `router.post` logout call and `onFinish` handling into an async action (e.g., `createAsyncThunk`), then update `isLogouting`/`isOpeLogoutDialogue` in the slice via `extraReducers` on pending/fulfilled/rejected to ensure the flags are reset.

MATCHESSolution

Align the state interface with the real thunk payload types (use `Goal[]` instead of `[]`) and explicitly type/cast the thunk `fulfilled` payload and the reducer `action` (including casting `action.error` to `string`).

MATCHESSolution

Create a root reducer with `combineReducers({ addUser: addUserSlice.reducer })`, pass that into `persistReducer` with `whitelist: ['addUser']`, and ensure the component uses `persistor` via `PersistGate`.

MATCHESSolution

Tension: cannot itself access any Redux context because none is provided to it from higher up the ReactTree. Outcome: so it can access the provided Redux context.

MATCHESSolution

You are not allowed in Redux, ever, to dispatch from inside a reducer. — Reducer logic has to be a pure synchronous function without side effects. Tension: You might want to do the logic you are currently doing in a thunk or with the listener middleware instead. Outcome: You have to use `createAsyncThunk` for that.

MATCHESSolution

Install the Redux DevTools browser extension and rerun the app so `composeWithDevTools` can work correctly.

MATCHESSolution

Redux-Toolkit also ships with Thunk middleware included and enabled by default — If you needed to configure and/or add middleware, use the `getDefaultMiddleware` utility.

MATCHESSolution

Do not reset the entire API slice state during the mutation lifecycle; instead rely on the sendLogout trigger promise/unwrap (or on isSuccess without resetting) to run navigate("/") after the mutation succeeds.

MATCHESSolution

convert the object into the builder callback syntax — createSlice({ name, initialState, reducers: { /* case reducers here */ },. Tension: object syntax for `createSlice.extraReducers` has been deprecated. Outcome: builder => { builder.addCase(todoAdded, (state, action) => {}) }.

MATCHESSolution

resolve npm install @reduxjs/toolkit@^1.9.6 — in my Expo project. Tension: createSlice is not a function (it is undefined). Outcome: npm install @reduxjs/toolkit@^1.9.6.

MATCHESSolution

Move the `Auth()` invocation into a thunk action (or call it from the component) and have the reducer handle only state updates based on the thunk’s dispatched success/failure actions.

MATCHESSolution

Use `state.books = state.books.filter(...)` (ensuring the assignment happens) or prefer a mutating approach like `splice()` that directly updates the array in the reducer.

MATCHESSolution

Use the reducer exported by createSlice in configureStore; the store gets the initial state from that reducer

MATCHESSolution

Update the reducer logic to access into `action.payload.applicationUser` property. — Redux-Toolkit slice reducers. Tension: the reducer is accessing some `user` property that doesn't exist in the response object. Outcome: Mutate state directly.

MATCHESSolution

You don't need to use the same name for both. Tension: it also ships with a new `combineSlices` api. Outcome: in most cases you probably shouldn't deviate unless you have a reason.

MATCHESSolution

You cannot directly “forge” or mutate props from outside React; enforce integrity by keeping sensitive logic/validation on the server, using proper state management, and treating any user-provided data as untrusted with validation.

MATCHESSolution

The bundler needs to bridge those two formats. Tension: Slider becomes an object like { __esModule: true, default: function Slider() {} } instead of the `function Slider()` React expects. Outcome: React gets a Wrapper Object.

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A workaround to this issue is to explicitly read the default export. — This works in all bundlers and safe for both ESM and CJS. Tension: Then use ``. Outcome: const Slider = SliderImport.default ?? SliderImport;.

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

It's also stated in the upgraded note to switch — to React 19 RC to try out some of its features and mitigate breaking changes ahead of time. Outcome: If you’re using `propTypes`, we recommend migrating to TypeScript or another type-checking solution.

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