Persisted State Migrations

Persisted State Migrations Overview

At its core, persisted state migrations is about doing one thing well in Redux. Once you understand the pattern, you can apply it consistently across projects and teams.

Good persisted state migrations pays off across the whole project: fewer surprises, easier collaboration, and smoother onboarding. The snippet below is a solid starting point.

import { persistStore, persistReducer } from 'redux-persist';
import storage from 'redux-persist/lib/storage';

const persistedReducer = persistReducer(
  { key: 'root', storage },
  rootReducer,
);

redux-persist saves slices of state to storage so they survive page reloads.

Persisted State Migrations Example

const slice = createSlice({ name, initialState, reducers });
const store = configureStore({ reducer: { key: slice.reducer } });
// dispatch(slice.actions.something())

• Start from a minimal Persisted State Migrations example and grow it only as needed.
• Keep things explicit so Persisted State Migrations behaves the same for everyone on the team.
• Name things clearly so teammates understand your Persisted State Migrations at a glance.
• Verify Persisted State Migrations works as expected before relying on it in important work.

Redux Cheatsheet

Quick Redux Toolkit reference related to persisted state migrations.

How Persisted State Migrations Works in Redux

Persisted State Migrations follows Redux's predictable data flow: components dispatch actions, reducers compute the next state from the previous state and the action, and subscribed components re-render.

redux-persist saves slices of state to storage so they survive page reloads.

• State lives in a single, read-only store.
• Actions are the only way to describe a change.
• Reducers are pure functions that return the next state.
• Redux Toolkit removes most boilerplate with slices and thunks.

Practical Guidance for Persisted State Migrations

In modern apps, persisted state migrations should use Redux Toolkit rather than hand-written Redux. Keep state minimal, colocate logic in slices, and use RTK Query for server data.

Common Mistakes

• Skipping edge cases and error handling when using persisted state migrations.
• Not verifying the result of persisted state migrations before moving on.
• Over-complicating persisted state migrations before you actually need the extra flexibility.
• Ignoring documentation, which makes persisted state migrations hard for the next person to follow.

Key Takeaways

• Persisted State Migrations is a core part of working effectively with Redux.
• Start small and keep persisted state migrations focused on a single goal.
• Apply consistent patterns so persisted state migrations scales across your project.
• Practise and document persisted state migrations to keep your workflow maintainable.