i dont know

src/App.jsx

@@ -1,44 +1,44 @@
-import React from 'react'
+import { useMutation, QueryClientProvider, QueryClient } from '@tanstack/react-query'
+import PostAddForm from './components/PostAddForm'
 
-class Clock extends React.Component {
+/*
-    constructor(props) {
+const mutation = useMutation({
-        super(props)
+    mutationFn: newUser => {
-        this.state = { time: new Date().toLocaleTimeString() }
+        fetch('https://jsonplaceholder.typicode.com/users', {
+            method: 'GET',
+            headers: {'Content-type':'application/json'},
+            body: JSON.stringify(newUser),
+        }).then(res => res.json())
     }
+})
+*/
 
-    componentDidMount() {
+const createQueryClient = () => {
-        this.timerId = setInterval(()=>{
+    new QueryClient({
-            this.setState({ time: new Date().toLocaleTimeString() })
+        defaultOptions: {
-        }, 1000);
+            queries: {
-        console.log('Таймер смонтирован')
+                staleTime: 5 * 60*1000,
-    }
+                retry: 1,
-    
+                gcTime: 10*60*1000,
-    componentDidUpdate(prevProps,prevState) {
+                refetchOnWindowFocus: false,
-        console.log('Компонент обнвлен')
+            },
-    }
+            mutations: {
-    
+                retry:0,
-    componentWillUnmount() {
+                onError: error => {console.error('Mutation error:',error.message)}
-        clearInterval(this.timerId)
+            }
-        console.log('Компонент таймера размонтирован')
+        }
-    }
+    })
-    
-    render() {
-        return <div>
-            <h2>Текущее время: {this.state.time}</h2>
-            </div>
-    }
 }
 
 function App() {
-    const [showClock, setShowClock] = React.useState(true);
-    
 	return (
 		<>
-			<h1>Жизненный цикл компонента часов</h1>
+			{/* Добавьте тестовый контент для проверки */}
-            <button onClick={()=> setShowClock(!showClock)}>
+			<h1>Hello, React!</h1>
-                {showClock ? 'Скрыть часы' : 'Показать часы' }
+        <QueryClientProvider client={createQueryClient}>
-            </button>
+            <PostAddForm />
-            {showClock && <Clock />}
+        </QueryClientProvider>
+            
 		</>
 	)
 }

src/main.jsx

@@ -4,5 +4,7 @@ import { createRoot } from 'react-dom/client'
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(
+	<StrictMode>
 		<App />
+	</StrictMode>
 )