Redux Code Splitting

Code Splitting Overview

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

Good code splitting 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.

Code Splitting Example

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

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

Redux Cheatsheet

Quick Redux Toolkit reference related to code splitting.

How Code Splitting Works in Redux

Code Splitting 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 Code Splitting

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

Key Takeaways

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