Ничего не сделали

package.json

@@ -4,12 +4,13 @@
   "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"
   },
@@ -22,6 +23,8 @@
     "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

@@ -1,98 +1,29 @@
-import { useState, useRef, useEffect } from 'react'
+import styles from './styles/App.module.scss'
+import React, { useState, useCallback } from 'react'
 
-function Example() {
-    const myRef = useRef(null);
-    const counterRef = useRef(0);
-    const [text, setText] = useState('');
-    
-    useEffect(() => {
-        myRef.current?.focus();
-    },[]);
-        
-    const handlerFocus = () => {
-        if(myRef.current) {
-            myRef.current.focus();
-        }
-    };
-    
-    const handlerChange = (event) => {
-        setText(event.target.value);
-    }
-    counterRef.current += 1;
-    return <div>
-        <input ref={myRef} text="text" /><br />
-        Количество рендров: {counterRef.current}<br />
-        <input text="text" onChange={handlerChange} value={text} />
-        <button onClick={handlerFocus}>Поставить фокус на поле</button>
-    </div>
-}
-
-function ClickCounter() {
-    const countRef = useRef(0);
-    
-    function handlerClick() {
-        countRef.current += 1;
-        //alert(`Нажали ${countRef.current} раз.`);
-    }
-    return <button onClick={handlerClick}>Нажать</button>;
-}
-
-function TimerComponent() {
-    const timerIdRef = useRef(null);
-    
-    useEffect(() => {
-        timerIdRef.current = setTimeout(() => {
-            alert("Прошло 3 секунды");
-        }, 3000);
-        return () => {
-            clearTimeout(timerIdRef.current);
-        }
-    },[]);
-}
-
-function PrevValue({ value }) {
-    const prevValueRef = useRef();
-    
-    useEffect(() => {
-        prevValueRef.current = value;
-    });
+function CounterButton({label, onClick}) {
     return (
-        <div>
-            Текущее значение: {value} <br />
-            Предыдущее значение: {prevValueRef.current}
-        </div>
+        <button onClick={onClick} className={styles.counter_button}>{label}</button>
     )
 }
-
-function ScrollList() {
-    const listRef = useRef(null);
-    
-    const scrollToBottom = () => {
-        if(listRef.current) {
-            listRef.current.scrollTop = listRef.current.scrollHeight;
-        }
-    }
-        
-    return (
-        <>
-            <div ref={listRef} 
-               style={{height: 200, overflowY: 'auto', border: '1px solid black'}}>
-                {[...Array(20)].map((_,i)=>(
-                    <div key={i}>Элемент № {i + 1}</div>
-                ))}
-            </div>
-            <button onClick={scrollToBottom}>Прокрутить вниз</button>
-        </>
-    )
+function CounterDisplay({value}) {
+    return (<div className={styles.counter_display}>
+            Значение счетчика: <b>{value}</b>
+    </div>)
 }
-        
+
 function App() {
+    const [counter,setCounter] = useState(0);
     
+    const increment = () => setCounter(prev => prev + 1);
+    const decrement = () => setCounter(prev => prev - 1);
     
 	return (
 		<>
-			<h1>Hello, React!</h1>
-            <ScrollList />
+            <h2>Практика по созданию счетчика с колбэками</h2>
+            <CounterButton label="Увеличить" onClick={increment} />
+            <CounterButton label="уменьшить" onClick={decrement} />
+            <CounterDisplay value={counter} />
 		</>
 	)
 }

src/main.jsx

@@ -1,8 +1,10 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
-// удаляем import './index.css'
+
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(
+	<StrictMode>
 		<App />
+	</StrictMode>
 )

src/styles/App.module.scss

@@ -0,0 +1,22 @@
+.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;
+    }
+}