Что то доделали. Надо сменить ветку

package.json

@@ -4,13 +4,12 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "vite",
+    "dev": "vite", 
     "build": "vite build",
     "lint": "eslint .",
     "preview": "vite preview"
   },
   "dependencies": {
-    "info": "^1.0.0",
     "react": "^19.1.0",
     "react-dom": "^19.1.0"
   },
@@ -23,8 +22,6 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.19",
     "globals": "^16.0.0",
-    "sass": "^1.99.0",
-    "sass-embedded": "^1.99.0",
     "vite": "^6.3.5"
   }
 }

src/App.jsx

@@ -1,29 +1,96 @@
-import styles from './styles/App.module.scss'
+import React from 'react'
-import React, { useState, useCallback } from 'react'
+import styles from './App.module.scss'
 
-function CounterButton({label, onClick}) {
+class Clock extends React.Component {
-    return (
+    constructor(props) {
-        <button onClick={onClick} className={styles.counter_button}>{label}</button>
+        super(props);
-    )
+        this.state = { date: new Date() };
+    }
+    componentDidMount() {
+        this.timerId = setInterval( () => this.tick(), 1000);
+    }
+    componentWillUnmount() {
+        clearInterval(this.timerId)
+    }
+    tick() {
+        this.setState({ date: new Date() })
+    }
+    render() {
+        return <div>{this.state.date.toLocaleTimeString()}</div>
+    }
 }
-function CounterDisplay({value}) {
+
-    return (<div className={styles.counter_display}>
+function Clock2() {
-            Значение счетчика: <b>{value}</b>
+    const [date, setDate] = React.useState(new Date());
-    </div>)
+    
+    React.useEffect(()=>{
+        const timerId = setInterval(()=> setDate(new Date()),1000);
+        return () => clearInterval(timerId);
+    },[])
+    
+    return <div>{date.toLocaleTimeString()}</div>
+}
+
+function MouseTracker() {
+    const [x,setX] = React.useState(0);
+    const [y,setY] = React.useState(0);
+    
+    const mouseMoveHandler = event => {
+        setX(event.clientX);
+        setY(event.clientY);
+    }
+    
+    React.useEffect(()=>{
+        document.addEventListener('mousemove', mouseMoveHandler);
+        return () => {
+            document.removeEventListener('mousemove',mouseMoveHandler);
+        }
+    },[]);
+    
+    return <div className={styles.container}>
+        <p>Координаты мыши:<br /> X:<b>{x}</b>, Y:<b>{y}</b></p>
+        </div>
+}
+
+function DataFetcher() {
+    const [posts,setPosts] = React.useState([]);
+    const [users,setUsers] = React.useState([]);
+    
+    const getPosts = async () => {
+        const response = await fetch('https://jsonplaceholder.typicode.com/posts');
+        const data = await response.json();
+        setUsers(data.reduce((acc, value) => {
+            if (!(value.userId in acc))
+                return [...acc,value.userId]
+            return acc
+        }))
+        console.log(users);
+        setPosts(data.slice(1,10));
+        
+    }
+    
+    React.useEffect(() => {
+        console.log("Компонент создан");
+        getPosts();
+        return () => {console.log("Компонент удален");setPosts([])};
+    },[])
+    
+    return <div><ol>{posts.map(post => <li id={post.id}>{post.title}</li>)}</ol></div>
 }
 
 function App() {
-    const [counter,setCounter] = useState(0);
+    const [tracker,setTracker] = React.useState(false);
-    
+    const [dataFetcher,setDataFetcher] = React.useState(false);
-    const increment = () => setCounter(prev => prev + 1);
-    const decrement = () => setCounter(prev => prev - 1);
     
 	return (
 		<>
-            <h2>Практика по созданию счетчика с колбэками</h2>
+			<h1>Hello, React!</h1>
-            <CounterButton label="Увеличить" onClick={increment} />
+            <Clock />
-            <CounterButton label="уменьшить" onClick={decrement} />
+            <Clock2 />
-            <CounterDisplay value={counter} />
+            <button onClick={() => setTracker(!tracker)}>Показать/Скрыть трекер</button>
+            { tracker && <MouseTracker /> }
+            <button onClick={() => setDataFetcher(!dataFetcher)}>Показать/Скрыть посты</button>
+            { dataFetcher && <DataFetcher /> }
 		</>
 	)
 }

src/App.module.scss

@@ -0,0 +1,11 @@
+.container {
+    width: 300px;
+    height: 200px;
+    border: 2px dashed grey;
+    margin: 10px;
+    text-align: center;
+    p {
+        margin-top: 20%;
+    }
+}
+

src/main.jsx

@@ -1,6 +1,6 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
-
+// удаляем import './index.css'
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(

src/styles/App.module.scss

@@ -1,22 +0,0 @@
-.container {
-    display:flex;
-    flex-direction: row;
-    border: 1px solid black;
-    border-radius: 5px;
-    margin-bottom: 10px;
-    p {
-        padding: 5px 10px;
-    }
-}
-.counter {
-    &_display{
-        border: 1px solid black;
-        border-width: 3px;
-        border-radius: 10px;
-        padding: 10px;
-        width: 300px;
-    }
-    &_button{
-        padding: 10px;
-    }
-}