Sourced from @​reduxjs/toolkit's releases.

v2.0.0

This major release :

• Removes the deprecated object syntax from createSlice and createReducer
• Removes other deprecated options
• Updates the middleware and enhancers options of configureStore to require callbacks
• Updates the packaging for better ESM/CJS compatibility and modernizes the build output
• Includes all changes to Redux core 5.0, Reselect 5.0, and Redux Thunk 3.0
• Updates RTKQ default subscription behavior
• Adds a new combineSlices method with support for lazy-loading slice reducers
• Adds a new "dynamic middleware" middleware with support for adding middleware at runtime
• Adds a new callback syntax to createSlice.reducers, with optional support for defining thunks inside of createSlice
• Adds the autoBatchEnhancer to configureStore by default
• Has many additional TS tweaks and improvements

This release has breaking changes. (Note: v2.0.1 was released with a couple hotfixes for Reselect and Redux Thunk right as this was being finalized.)

This release is part of a wave of major versions of all the Redux packages: Redux Toolkit 2.0, Redux core 5.0, React-Redux 9.0, Reselect 5.0, and Redux Thunk 3.0.

For full details on all of the breaking changes and other significant changes to all of those packages, see the "Migrating to RTK 2.0 and Redux 5.0" migration guide in the Redux docs.

[!NOTE] The Redux core, Reselect, and Redux Thunk packages are included as part of Redux Toolkit, and RTK users do not need to manually upgrade them - you'll get them as part of the upgrade to RTK 2.0. (If you're not using Redux Toolkit yet, please start migrating your existing legacy Redux code to use Redux Toolkit today!)

# RTK
npm install @reduxjs/toolkit
yarn add @reduxjs/toolkit

Changelog

Object syntax for createSlice.extraReducers and createReducer removed

RTK's createReducer API was originally designed to accept a lookup table of action type strings to case reducers, like { "ADD_TODO": (state, action) => {} }. We later added the "builder callback" form to allow more flexibility in adding "matchers" and a default handler, and did the same for createSlice.extraReducers.

We have removed the "object" form for both createReducer and createSlice.extraReducers in RTK 2.0, as the builder callback form is effectively the same number of lines of code, and works much better with TypeScript.

As an example, this:

const todoAdded = createAction('todos/todoAdded')
createReducer(initialState, {
[todoAdded]: (state, action) => {},
})
createSlice({
name,
initialState,
</tr></table>

... (truncated)

• cf29e62 Release 2.0.1
• 6bcedea Merge pull request #3944 from reduxjs/bugfix/2.0-hotfixes
• 2dbb71c Hotfix dep updates
• ca2c99c Release 2.0.0
• 78f033d Merge pull request #3941 from reduxjs/feature/2.0-final-deps-update
• 2472e03 Final deps update
• 350e79f Merge pull request #3089 from reduxjs/v2.0-integration
• 0fa46d4 Add missing docs paragraphs
• 7532c9b Merge pull request #3939 from reduxjs/docs/2.0-final-migration-polish
• cf167c3 Final migration tweaks
• Additional commits viewable in compare view

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