15 — Redux Toolkit (RTK)

Redux Toolkit is the official, recommended way to write Redux. It eliminates boilerplate and includes best practices by default.

Core Concepts

Concept	Description
Store	Single source of truth for global state
Slice	A piece of state + its reducers (auto-generates action creators)
Action	An object describing what happened { type, payload }
Reducer	Pure function that updates state based on action
Dispatch	Send an action to the store
Selector	Extract data from the store
Thunk	Async logic (API calls, side effects)

RTK vs Classic Redux

Classic Redux	Redux Toolkit
switch statements	createSlice (auto-generates)
Manual action creators	Auto-generated from slice
Immutable updates by hand	Uses Immer under the hood
Separate files for actions/reducers	Everything in one slice
Manual thunk setup	createAsyncThunk built-in

File

• redux-toolkit.tsx — configureStore, createSlice, createAsyncThunk, RTK Query basics, typed hooks, selectors