Sourced from @​reduxjs/toolkit's releases.

v1.9.0

This feature release adds several new options for RTK Query's createApi and fetchBaseQuery APIs, adds a new upsertQueryData util, rewrites RTKQ's internals for improved performance, adds a new autoBatchEnhancer, deprecates the "object" syntax for createReducer and createSlice.extraReducers, deprecates and removes broken utils for getting running query promises, improves TS inference, exports additional types, and fixes a number of reported issues.

npm i @reduxjs/toolkit@latest
yarn add @​reduxjs/toolkit@​latest

We plan to start work on RTK 2.0 in the next few weeks. RTK 2.0 will focus on dropping legacy build compatibility and deprecated APIs, with some potential new features. See the linked discussion thread and give us feedback on ideas!

Deprecations and Removals

Object Argument for createReducer and createSlice.extraReducers

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 intend to remove the "object" form for both createReducer and createSlice.extraReducers in RTK 2.0. The builder callback form is effectively the same number of lines of code, and works much better with TypeScript.

Starting with this release, RTK will print a one-time runtime warning for both createReducer and createSlice.extraReducers if you pass in an object argument.

As an example, this:

const todoAdded = createAction('todos/todoAdded');
createReducer(initialState, {
[todoAdded]: (state, action) => {}
})
createSlice({
name,
initialState,
reducers: {/* case reducers here */},
extraReducers: {
[todoAdded]: (state, action) => {}
}
})

should be migrated to:

createReducer(initialState, builder => {
  builder.addCase(todoAdded, (state, action) => {})
})
createSlice({
name,
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• f7a8282 Release 1.9.0
• 2425f02 Merge pull request #2401 from reduxjs/v1.9-integration
• ed75be0 Merge pull request #2859 from reduxjs/feature/final-v1.9-tweaks
• 5e4ad31 Bump dependencies
• 8f30d43 Add TS 4.9 RC to the test matrix
• 35f7e6d Switch autobatch default method to 'raf'
• 48fe9e1 Release 1.9.0-rc.1
• fdc1c50 Merge pull request #2857 from reduxjs/feature/autobatch-timing
• f178b94 Make autobatching notification queueing configurable
• b12b22c Merge branch 'master' into v1.9-integration
• Additional commits viewable in compare view

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