Redux Migration

Migration Overview

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

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

import { configureStore } from '@reduxjs/toolkit';
import { Provider } from 'react-redux';

const store = configureStore({ reducer: rootReducer });

function App() {
  return (
    <Provider store={store}>
      <Root />
    </Provider>
  );
}

A Provider makes the single Redux store available to every component in the tree.

Migration Example

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

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

Redux Cheatsheet

Quick Redux Toolkit reference related to migration.

How Migration Works in Redux

Migration 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.

A Provider makes the single Redux store available to every component in the tree.

• 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 Migration

In modern apps, migration 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 migration.
• Not verifying the result of migration before moving on.
• Over-complicating migration before you actually need the extra flexibility.
• Ignoring documentation, which makes migration hard for the next person to follow.

Key Takeaways

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