TL;DR

Redux Toolkit now includes learning resources (skills files) via TanStack Intent, helping developers quickly learn and adopt modern RTK practices.

New

• TanStack Intent Skills: Access interactive learning files directly within Redux Toolkit to improve your RTK knowledge. (TanStack Intent: AI-powered learning platform)
• RTK Query Hook Types: RTK Query hook options types are now exported for easier reuse in custom code.

Fixes Worth Knowing

• Infinite query isSuccess flag is now handled correctly, preventing UI flashes.
• Auto-batching now works reliably in background browser tabs with a timeout fallback.

TL;DR

RTK-Query OpenAPI Codegen now offers greater customization, allowing developers to override endpoint behavior, configure Prettier formatting, and handle default return schemas for more precise API integration (code generation).

New

• Enhanced Customization: Override endpoints and configure Prettier formatting during code generation.
• Default Schema Support: Handle default return schemas within your OpenAPI definitions.

Fixes Worth Knowing

• Fixed issues with optional types and parameter overrides during code generation.
• Improved error messages when running the codegen tool without TypeScript support (tool for building API clients).
• Resolved build issues and improved test reliability.

TL;DR

RTK-Query OpenAPI Codegen now generates more accurate TypeScript types from your OpenAPI specifications, including handling for read-only properties and duplicate parameter names.

Breaking

• Read-only properties now split types (may require updating your existing type references).
• Requires TypeScript 5.x (previously 4.1-4.5).

New

• Generate true TypeScript enums (instead of string unions) for improved type safety.
• Improved compatibility with recent OpenAPI specifications.

Fixes Worth Knowing

• Handles duplicate parameter names in queries and parameters by prefixing them.
• Addresses circular type generation issues with oazapfts.

TL;DR

Redux Toolkit 1.9 introduces an “auto-batching” store enhancer that can improve UI performance, particularly with RTK Query (a data fetching and caching tool), by delaying subscriber notifications for certain actions.

Breaking

• serializeQueryArgs option for RTK Query endpoints now accepts objects or numbers in addition to strings, changing how cache keys are generated.

New

• Auto-Batching Enhancer: A new store enhancer delays notifications for actions tagged with action.meta[SHOULD_AUTOBATCH] = true, improving performance by reducing unnecessary re-renders.
• Global fetchBaseQuery Options: You can now set responseHandler, validateStatus, and timeout globally for all RTK Query requests.

Fixes Worth Knowing

• forceRefetch with object cache keys in RTK Query now functions correctly.
• RTK Query now correctly identifies missing middleware setup, preventing potential persistence issues.

Before You Upgrade

• If you are using serializeQueryArgs, review its behavior as it now accepts more data types, potentially impacting your cache keys.

TL;DR

Redux Toolkit now requires a name field when using createSlice, and defaults to void payload types for createAction, improving type safety and preventing action type collisions.

Breaking

• createSlice requires a name field (previously optional slice).
• createAction defaults to void payload type; specify types explicitly (e.g., createAction<string>).

New

• createSlice now exports caseReducers, providing direct access to individual reducer functions.

Fixes Worth Knowing

• Resolved TypeScript issues affecting cross-version compatibility.
• Fixed a broken re-export of Redux types (Action, etc.).

Before You Upgrade

• Update all createSlice calls to use name instead of slice, and add name if it was previously omitted.
• Explicitly define payload types when using createAction (e.g., createAction<MyType>).

TL;DR

Redux Toolkit is undergoing a TypeScript rewrite, available as redux-starter-kit@ts-next for testing with TypeScript projects.

Before You Upgrade

If using TypeScript, test your application with redux-starter-kit@ts-next and report any issues encountered with the new TypeScript definitions.