Use new createSlice to replace reducer

src/app/App.test.tsx

@@ -3,7 +3,7 @@ import { createStore } from "redux";
 import { Provider } from "react-redux";
 
 import App from './App';
-import {todoReducer} from "../state/todo/reducers";
+import todoReducer from "../features/todo/todosSlice";
 
 test('renders learn react link', () => {
   const store = createStore(todoReducer);

src/app/App.tsx

@@ -2,23 +2,17 @@ import React, {useState} from 'react';
 import { useSelector, useDispatch } from "react-redux";
 
 import Todo from "../components/todo/Todo";
-import { TodoItem } from "../state/todo/types";
-import { ADD_TODO } from "../state/todo/reducers";
+import { addTodo } from "../features/todo/todosSlice";
+import { RootState } from "./store";
 
 function App() {
     const [text, setText] = useState("");
-    const todos = useSelector((state: { todos: TodoItem[] }) => state.todos);
+    const todos = useSelector((state: RootState) => state.todos.todos);
     const dispatch = useDispatch();
 
     const handleAddTodo = () => {
         if (text.trim() === "") return;
-        const newTodo: TodoItem = {
-            id: todos.length + 1,
-            text: text,
-            completed: false,
-        };
-
-        dispatch({ type: ADD_TODO, payload: newTodo});
+        dispatch(addTodo(text));
         setText("");
     }
 
@@ -33,12 +27,7 @@ function App() {
             <button onClick={handleAddTodo}>Add Todo</button>
             <ul>
                 {todos.map((todo) => (
-                    <Todo
-                        key={todo.id}
-                        id={todo.id}
-                        text={todo.text}
-                        completed={todo.completed}
-                    />
+                    <Todo key={todo.id} todo={todo}/>
                 ))}
             </ul>
         </div>

src/app/store.ts

@@ -0,0 +1,11 @@
+import { configureStore } from "@reduxjs/toolkit";
+
+import todosReducer from '../features/todo/todosSlice';
+
+export const store = configureStore({
+    reducer: {
+        todos: todosReducer,
+    },
+});
+
+export type RootState = ReturnType<typeof store.getState>;

src/components/todo/Todo.test.tsx

@@ -1,53 +1,56 @@
 import React from "react";
-import {screen, render, fireEvent, getByRole} from "@testing-library/react"
-import { createStore } from "redux";
+import {render, fireEvent} from "@testing-library/react"
 import { Provider } from "react-redux";
 
 import Todo from "./Todo";
-import {todoReducer} from "../../state/todo/reducers";
-import {store} from "../../state/store";
+import todoReducer  from '../../features/todo/todosSlice'
+import {configureStore} from "@reduxjs/toolkit";
 
-describe("Todo", () => {
-
-    const props = {
-        id: 1,
-        text: "Buy milk",
-        completed: false,
+const renderWithRedux = (
+    ui: React.ReactElement,
+    { store = configureStore({ reducer: { todos: todoReducer } }) } = {}
+) => {
+    return {
+        ...render(<Provider store={store}>{ui}</Provider>),
+        store,
     };
-
-    it("should render todo text", () => {
-        render(
-            <Provider store={store}>
-                <Todo {...props}/>
-            </Provider>
-        )
-        expect(screen.getByText(props.text)).toBeInTheDocument();
+};
+describe("Todo", () => {
+    it("renders todo text and toggle button", () => {
+        const todo = {
+            id: 1,
+            text: "Test todo",
+            completed: false,
+        };
+        const { getByText, getByRole } = renderWithRedux(<Todo todo={todo} />);
+        const todoText = getByText("Test todo");
+        expect(todoText).toBeInTheDocument();
+        const toggleButton = getByRole("checkbox");
+        expect(toggleButton).toBeInTheDocument();
     });
 
-    it("should call onToggle when checkbox is clicked", () => {
-        render(
-            <Provider store={store}>
-                <Todo {...props} />
-            </Provider>
-        )
-        fireEvent.click(screen.getByRole("checkbox"));
+    it("toggles todo when toggle button is clicked", () => {
+        const todo = {
+            id: 1,
+            text: "Test todo",
+            completed: false,
+        };
+        const { getByRole, store } = renderWithRedux(<Todo todo={todo} />);
+        const toggleButton = getByRole("checkbox");
+        fireEvent.click(toggleButton);
+        expect(store.getState().todos.todos[0].completed).toBe(true);
     });
 
-    it("should call onDelete when delete button is clicked", () => {
-        render(
-            <Provider store={store}>
-                <Todo {...props} />
-            </Provider>
-        )
-        fireEvent.click(screen.getByRole("button"));
-    })
+    it("deletes todo when delete button is clicked", () => {
+        const todo = {
+            id: 1,
+            text: "Test todo",
+            completed: false,
+        };
+        const { getByRole, store } = renderWithRedux(<Todo todo={todo} />);
+        const deleteButton = getByRole("button");
+        fireEvent.click(deleteButton);
+        expect(store.getState().todos.todos).toHaveLength(0);
+    });
 
-    it("should have line-through style when completed is true", () => {
-        render(
-            <Provider store={store}>
-                <Todo {...props} completed={true} />
-            </Provider>
-        )
-        expect(screen.getByText(props.text)).toHaveStyle("text-decoration: line-through");
-    })
 })

src/components/todo/Todo.tsx

@@ -1,28 +1,26 @@
 import React from "react";
 import {useDispatch} from "react-redux";
-import { DELETE_TODO, TOGGLE_TODO } from "../../state/todo/reducers";
+import { toggleTodo, deleteTodo, TodoItem } from "../../features/todo/todosSlice";
 
 interface TodoProps {
-    id: number;
-    text: string;
-    completed: boolean;
+    todo: TodoItem;
 }
 
-const Todo = ( { id, text, completed }: TodoProps) => {
+const Todo = ( { todo }: TodoProps) => {
     const dispatch = useDispatch();
     const handleToggle = () => {
-        dispatch({ type: TOGGLE_TODO, payload: id });
+        dispatch(toggleTodo(todo.id));
     };
 
     const handleDelete = () => {
-        dispatch({ type: DELETE_TODO, payload: id });
+        dispatch(deleteTodo(todo.id));
     };
 
     return (
         <li>
-            <input type="checkbox" checked={completed} onChange={handleToggle} />
-            <span style={{ textDecoration: completed ? "line-through" : "none"}}>
-                {text}
+            <input type="checkbox" checked={todo.completed} onChange={handleToggle} />
+            <span style={{ textDecoration: todo.completed ? "line-through" : "none"}}>
+                {todo.text}
             </span>
             <button onClick={handleDelete}>Delete</button>
         </li>

src/features/todo/todosSlice.ts

@@ -0,0 +1,46 @@
+import { createSlice, PayloadAction } from "@reduxjs/toolkit";
+
+export interface TodoItem {
+    id: number;
+    text: string;
+    completed: boolean;
+}
+
+interface TodoState {
+    todos: TodoItem[];
+}
+
+const initialState: TodoState = {
+    todos: []
+}
+
+export const todosSlice = createSlice({
+    name: 'todo',
+    initialState,
+    reducers: {
+        addTodo: {
+            reducer: (state, action: PayloadAction<TodoItem>) => {
+                state.todos.push(action.payload);
+            },
+            prepare: (text: string) => ({
+                payload: {
+                    id: new Date().getTime(),
+                    text,
+                    completed: false,
+                },
+            }),
+        },
+        toggleTodo: (state, action: PayloadAction<number>) => {
+            const todo = state.todos.find((todo) => todo.id === action.payload);
+            if (todo) {
+                todo.completed = !todo.completed;
+            }
+        },
+        deleteTodo: (state, action: PayloadAction<number>) => {
+            state.todos = state.todos.filter((todo) => todo.id !== action.payload);
+        },
+    },
+})
+
+export const { addTodo, toggleTodo, deleteTodo } = todosSlice.actions;
+export default todosSlice.reducer;

src/index.tsx

@@ -1,7 +1,8 @@
 import React from 'react';
 import ReactDOM from "react-dom";
 import { Provider } from "react-redux";
-import { store } from "./state/store";
+
+import { store } from "./app/store";
 import App from './app/App';
 
 ReactDOM.render(

src/state/store.ts

@@ -1,5 +0,0 @@
-import { createStore } from "redux";
-
-import {todoReducer} from "./todo/reducers";
-
-export const store = createStore(todoReducer);

src/state/todo/reducers.ts

@@ -1,60 +0,0 @@
-import { TodoItem } from "./types";
-
-interface TodoState {
-    todos: TodoItem[];
-}
-
-const initialState: TodoState = {
-    todos: [],
-}
-
-export const ADD_TODO = "ADD_TODO";
-export const TOGGLE_TODO = "TOGGLE_TODO";
-export const DELETE_TODO = "DELETE_TODO";
-
-interface AddTodoAction {
-    type: typeof ADD_TODO;
-    payload: TodoItem;
-}
-
-interface ToggleTodoAction {
-    type: typeof TOGGLE_TODO;
-    payload: number;
-}
-
-interface DeleteTodoAction {
-    type: typeof DELETE_TODO;
-    payload: number;
-}
-
-type TodoActionTypes = AddTodoAction | ToggleTodoAction | DeleteTodoAction;
-
-export function todoReducer(
-    state = initialState,
-    action: TodoActionTypes
-): TodoState {
-    switch (action.type) {
-        case ADD_TODO:
-            return {
-                ...state,
-                todos: [...state.todos, action.payload],
-            };
-        case TOGGLE_TODO:
-            return {
-                ...state,
-                todos: state.todos.map((todo) => {
-                    if (todo.id === action.payload) {
-                        return { ...todo, completed: !todo.completed };
-                    }
-                    return todo;
-                }),
-            };
-        case DELETE_TODO:
-            return {
-                ...state,
-                todos: state.todos.filter((todo) => todo.id !== action.payload),
-            };
-        default:
-            return state;
-    }
-}

src/state/todo/types.ts

@@ -1,5 +0,0 @@
-export interface TodoItem {
-    id: number;
-    text: string;
-    completed: boolean;
-}