Сделали несколько кастомных хуков

package-lock.json

@@ -8,6 +8,7 @@
       "name": "store-client",
       "version": "0.0.0",
       "dependencies": {
+        "@tanstack/react-query": "^5.100.14",
         "react": "^19.1.0",
         "react-dom": "^19.1.0"
       },
@@ -1304,6 +1305,32 @@
         "win32"
       ]
     },
+    "node_modules/@tanstack/query-core": {
+      "version": "5.100.14",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.100.14.tgz",
+      "integrity": "sha512-5X41dGpxgeaHISCRW2oYwcSycZeULZzAunaudXT9ov1KOTj9xwt0CH6hbwqP1/z74ZWF7rYFnDpyYH07XFcZew==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/react-query": {
+      "version": "5.100.14",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.100.14.tgz",
+      "integrity": "sha512-oOr6aRdSFEwWhzxEkD/9ZcItM3+LjBSkeVmadWKwUssAHTsqd/7bOjWrX4AbvEkoEhgAxzN0Xk6H/aYzXiYBAw==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/query-core": "5.100.14"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": "^18 || ^19"
+      }
+    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "resolved": "https://registry.npmjs.org/@types/babel__core/-/babel__core-7.20.5.tgz",

package.json

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

src/App.jsx

@@ -1,111 +1,93 @@
-import React from 'react'
+import React, {useState, useEffect, useRef } from 'react'
+//import { useQuery } from '@tanstack/react-query'
 
-class ErrorBoundary extends React.Component {
+function useWindowWidth() {
-    constructor(props) {
+    const [width,setWidth] = useState(window.innerWidth)
-        super(props);
+    
-        this.state = {hasError: false};
+    useEffect(() => {
+        const handleResize = () => setWidth(window.innerWidth);
+        window.addEventListener('resize',handleResize);
+        return () => window.removeEventListener('resize',handleResize);
+    },[])
+    
+    return width
 }
 
-    static getDerivedStateFromError(error) {
+function useLocalStorage(key, initValue) {
-        return { hasError: true }
+    const [value, setValue] = useState(()=>{
-    }
+        const stored = localStorage.getItem(key);
-    
+        return stored !== null ? JSON.parse(stored) : initValue
-    componentDidCatch(error,info) {
-        console.log(error,info);
-    }
-    
-    handlerReset = () => {
-        this.setState({hasError: false});
-    }
-    
-    render() {
-        if (this.state.hasError) {
-            return (
-                <div>
-                    <h1>Что то поломалось</h1>
-                    <button onClick={this.handlerReset}>Повторить</button>
-                </div>)
-        }
-        return this.props.children;
-    }
-}
-
-class AdvancedErrorBoundary extends React.Component {
-    constructor(props) {
-        super(props);
-        this.state = {
-            hasError: false,
-            error: null,
-            errorInfo: null
-        }
-    }
-    
-    static getDerivedStateFromError(error) {
-        return { hasErorr: true }
-    }
-    
-    componentDidCatch(error, info) {
-        this.setState({ 
-            error: error,
-            errorInfo: info
     })
-    }
     
-    handleReset = () => {
+    useEffect(() => {
-        this.setState({
+        localStorage.setItem(key, JSON.stringify(value))
-            hasError:false,
+    },[key, value])
-            error: null,
-            errorInfo:null
-        });
-    }
     
-    render() {
+    return [value,setValue]
-        if(this.state.hasError) {
+}
-            console.log('Error');
+/*
-            return (
+function useUserData(userId) {
-                <div>
+    return useQuery(
-                    <h2>Произошла ошибка</h2>
+        ['user',userId],
-                    <p>Извеняемся, работаем, исправляем. Разработчика привязали к батарее</p>
+        () => fetch(`/api/user/${userId}`).then(res => res.json()),
-                    <button onClick={this.handleReset}>Попробовать снова</button>
+        {refetchOnWindowFocus: false}
-                </div>
     )
-        }
+}*/
-        //Если ошибок нет, то рендрим дочерние объекты
+
-        return this.props.children
+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)
         }
     }
     
-function ProblemComponent() {
+    return { value, error, onChange }
-    const [counter,setCounter] = React.useState(0)
-    
-    const handlerClick = () => setCounter(counter + 1)
-    
-    React.useEffect(() => {
-        if (counter > 5) {
-            throw new Error("Ошибка в компоненте");
 }
-    },[counter]);
+
-    return (
+function useInterval(callback, delay) {
-        <div>
+    const savedCallback = useRef()
-            <h2>Счетчик: {counter}</h2>
+    
-            <button onClick={handlerClick}>Прибавить</button>
+    useEffect(()=>{
-        </div>
+        savedCallback.current = callback
-    )
+    },[callback]);
+    
+    useEffect(()=>{
+        if (delay == null) return
+        const id = setInterval(()=>{
+            savedCallback.current()
+        },delay);
+        return () => clearInterval(id);
+    },[delay])
 }
 
 function App() {
+    const width = useWindowWidth();
+    const [theme, setTheme] = useLocalStorage('theme','light');
+    
+    const username = useInput(
+        '',
+        value => value.length < 3 ? 'минимум 3 символа' : null
+    )
+    
 	return (
 		<>
-			<h1>Обработка ошибок в компонентах</h1>
+			<h1>Hello, React!{width}</h1>
-            <ErrorBoundary>
+            <button onClick={()=>{
-                <ProblemComponent />
+                setTheme(theme === 'light' ? 'dark' : 'light')
-            </ErrorBoundary>
+            }}>
-            <ErrorBoundary>
+                Сменить тему
-                <ProblemComponent />
+            </button>
-            </ErrorBoundary>
+            <p><input type="text" 
-            <ErrorBoundary>
+                value={username.value} 
-                <ProblemComponent />
+                onChange={username.onChange} />
-            </ErrorBoundary>
+                { username.error ? username.error : '' }
+            </p>
 		</>
 	)
 }