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Frameworks & web · #redux
Learn how to use Redux Thunk to handle async actions, see a step‑by‑step example, and avoid common pitfalls like state mutation or infinite loops.
I'm wiring up RTK Query (via createApi in Redux Toolkit) and want queries to refetch when the browser window regains focus. The documentation describes refetchOnFocus as opt-in, and that setupListeners(store.dispatch) must be called for focus/reconnect events to reach the store. My uncertainty is about how the pieces interact before I commit to a configurati
State Consistency in Redux Reducers When implementing state restoration logic in Redux, the behavior of combineReducers regarding undefined return values can impact the integrity of the recovered state tree. In standard operation, if a reducer returns undefined for a specific key, that key may be omitted from the resulting state object. This creates a discre
Goal In a large application, each feature defines a Redux Toolkit slice with a name that prefixes all generated action types. The intent is to isolate actions by feature, but the Toolkit does not enforce that these names are globally unique. Uncertainty When two slices share the same name , their action type strings collide (e.g., counter/increment from both
Redux Listener Middleware and React‑Toastify: Deciding Alert Logic Placement The goal is to choose a location for alert‑generating logic that keeps UI concerns decoupled from state updates while preserving testability and avoiding excessive re‑renders. Constraints include ensuring that throttling/deduplication middleware runs after async thunks but before lo
Background Redux 5.0.0 moved to a pure ESM package with a conditional exports field. The require condition points to a generated CommonJS wrapper that re-exports the ESM module via dynamic import() . This wrapper cannot be resolved synchronously in environments that lack top-level await or async module resolution. Constraints Affected tooling includes Webpac
Transitioning to createSlice Architecture Migrating a legacy Redux codebase to Redux Toolkit (RTK) involves shifting from manual action-type constants and switch-case reducers to the createSlice API. While RTK integrates Immer to allow mutating-style logic, legacy reducers still require strict immutability to prevent state corruption. A technical uncertainty
Goal When paging through a large dataset with Redux Toolkit’s createEntityAdapter , the store keeps every fetched entity. The adapter’s API exposes removeAll and removeOne , but it lacks a built‑in mechanism to automatically drop entities that fall outside a desired window of pages. Constraints • The adapter normalizes data into an ids array and an entityMap
CreateSlice serializability enforcement – missing constraint When building a Redux Toolkit store, the createSlice API accepts any JavaScript value as initialState and reducer logic, yet it does not automatically verify that those values are serializable. This omission can lead to silent failures in dev‑tools logging, persistence layers, and production builds
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