Video: What's New in Redux Toolkit 2.0

Redux Toolkit 2.0 is the latest version of Redux Toolkit, a library that simplifies standard Redux patterns like creating stores, writing reducers, and data fetching. It includes new features, modernized JavaScript build artifacts, and updated TypeScript types.

Redux Toolkit 2.0 includes features such as combineSlices for lazy loading reducers, the ability to define selectors and thunks inside the createSlice API, and integration of the latest version of the EMER immutable update library.

Redux Toolkit 2.0 was released to modernize JavaScript build artifacts, improve ES module and common JS compatibility, add new features, remove deprecated APIs, and update TypeScript types for better type safety and user experience.

The major breaking changes include the removal of object syntax in methods like createSlice and createReducer, which is replaced by a callback syntax for better TypeScript support, and the dropping of UMD build artifacts. Most breaking changes are related to TypeScript improvements.

RTK Query is a sub-piece of Redux Toolkit specifically designed to simplify data fetching in Redux applications. It wraps around the Redux core APIs and aims to make data fetching more efficient and easier to manage.

RTK 1.0 was released in October 2019.

The goals of Redux Toolkit 2.0 include correct ES module and common JS compatibility, modernizing JavaScript build artifacts, adding new features, removing deprecated APIs, and shipping updated TypeScript types.

UMD build artifacts were dropped because very few people use them, and they are mostly used for simple use cases like a code pen script. The focus is on modern JavaScript, and users needing IE11 support should handle the compiling themselves.

combineSlices is a new feature in Redux Toolkit 2.0 that allows for lazy loading of reducers in a Redux application, enabling code splitting and dynamic reducer injection.

New documentation for using Redux with Next.js and a migration guide for upgrading to Redux Toolkit 2.0 are available to help users transition smoothly and take advantage of the new features.