Ничего не сделали

package.json

@@ -10,7 +10,7 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "@tanstack/react-query": "^5.100.14",
+    "info": "^1.0.0",
     "react": "^19.1.0",
     "react-dom": "^19.1.0"
   },
@@ -23,6 +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

@@ -1,93 +1,29 @@
-import React, {useState, useEffect, useRef } from 'react'
-//import { useQuery } from '@tanstack/react-query'
+import styles from './styles/App.module.scss'
+import React, { useState, useCallback } from 'react'
 
-function useWindowWidth() {
-    const [width,setWidth] = useState(window.innerWidth)
-    
-    useEffect(() => {
-        const handleResize = () => setWidth(window.innerWidth);
-        window.addEventListener('resize',handleResize);
-        return () => window.removeEventListener('resize',handleResize);
-    },[])
-    
-    return width
-}
-
-function useLocalStorage(key, initValue) {
-    const [value, setValue] = useState(()=>{
-        const stored = localStorage.getItem(key);
-        return stored !== null ? JSON.parse(stored) : initValue
-    })
-    
-    useEffect(() => {
-        localStorage.setItem(key, JSON.stringify(value))
-    },[key, value])
-    
-    return [value,setValue]
-}
-/*
-function useUserData(userId) {
-    return useQuery(
-        ['user',userId],
-        () => fetch(`/api/user/${userId}`).then(res => res.json()),
-        {refetchOnWindowFocus: false}
+function CounterButton({label, onClick}) {
+    return (
+        <button onClick={onClick} className={styles.counter_button}>{label}</button>
     )
-}*/
-
-function useInput(initValue, validate) {
-    const [value, setValue] = useState(initValue);
-    const [error, setError] = useState(null);
-    
-    const onChange = e => {
-        const newValue = e.target.value
-        setValue(newValue)
-        if (validate) {
-            const validationResult = validate(newValue)
-            setError(validationResult)
 }
-    }
-    
-    return { value, error, onChange }
-}
-
-function useInterval(callback, delay) {
-    const savedCallback = useRef()
-    
-    useEffect(()=>{
-        savedCallback.current = callback
-    },[callback]);
-    
-    useEffect(()=>{
-        if (delay == null) return
-        const id = setInterval(()=>{
-            savedCallback.current()
-        },delay);
-        return () => clearInterval(id);
-    },[delay])
+function CounterDisplay({value}) {
+    return (<div className={styles.counter_display}>
+            Значение счетчика: <b>{value}</b>
+    </div>)
 }
 
 function App() {
-    const width = useWindowWidth();
-    const [theme, setTheme] = useLocalStorage('theme','light');
+    const [counter,setCounter] = useState(0);
     
-    const username = useInput(
-        '',
-        value => value.length < 3 ? 'минимум 3 символа' : null
-    )
+    const increment = () => setCounter(prev => prev + 1);
+    const decrement = () => setCounter(prev => prev - 1);
     
 	return (
 		<>
-			<h1>Hello, React!{width}</h1>
-            <button onClick={()=>{
-                setTheme(theme === 'light' ? 'dark' : 'light')
-            }}>
-                Сменить тему
-            </button>
-            <p><input type="text" 
-                value={username.value} 
-                onChange={username.onChange} />
-                { username.error ? username.error : '' }
-            </p>
+            <h2>Практика по созданию счетчика с колбэками</h2>
+            <CounterButton label="Увеличить" onClick={increment} />
+            <CounterButton label="уменьшить" onClick={decrement} />
+            <CounterDisplay value={counter} />
 		</>
 	)
 }

src/main.jsx

@@ -1,6 +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

@@ -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;
+    }
+}