add i18n

package-lock.json

@@ -9,7 +9,8 @@
       "version": "0.0.0",
       "dependencies": {
         "react": "^19.1.0",
-        "react-dom": "^19.1.0"
+        "react-dom": "^19.1.0",
+        "react-intl": "^10.1.13"
       },
       "devDependencies": {
         "@eslint/js": "^9.25.0",
@@ -898,6 +899,38 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       }
     },
+    "node_modules/@formatjs/fast-memoize": {
+      "version": "3.1.6",
+      "resolved": "https://registry.npmjs.org/@formatjs/fast-memoize/-/fast-memoize-3.1.6.tgz",
+      "integrity": "sha512-H5aexk1Le7T9TPmscacZ+1pR6CTa2n1wq+HDVGXhH8TzUlQQpeXzZs91dRtmFHrbeNbjPFPfQujUqm7MHgVoXQ==",
+      "license": "MIT"
+    },
+    "node_modules/@formatjs/icu-messageformat-parser": {
+      "version": "3.5.11",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-3.5.11.tgz",
+      "integrity": "sha512-NVsuNsc2dUVG9+4HBJ/srScxtA/18LqGgwtop/tuN/OIBjVl6QA+0KhfZQddDD9sEh2LeVjLFPGVU3ixa3blcA==",
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/icu-skeleton-parser": "2.1.10"
+      }
+    },
+    "node_modules/@formatjs/icu-skeleton-parser": {
+      "version": "2.1.10",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-skeleton-parser/-/icu-skeleton-parser-2.1.10.tgz",
+      "integrity": "sha512-XuSva+8ZGawk8VnD5VD6UeH8KarQ/Z022zgjHDoHmlNiAewstXuuzXc0Hk5pGFSdG+nNw5bfJKXqj1ZXHn9yUA==",
+      "license": "MIT"
+    },
+    "node_modules/@formatjs/intl": {
+      "version": "4.1.13",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl/-/intl-4.1.13.tgz",
+      "integrity": "sha512-dufOl09iREq8V+laVdlGuyoqNmuzqDvyeA3O3k+0XQfvKJgK8bBWFKqYYWejFMKeOij/4LuPKJA+LsshpXQ4sw==",
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "3.1.6",
+        "@formatjs/icu-messageformat-parser": "3.5.11",
+        "intl-messageformat": "11.2.8"
+      }
+    },
     "node_modules/@humanfs/core": {
       "version": "0.19.1",
       "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
@@ -1367,7 +1400,6 @@
       "version": "19.1.6",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-19.1.6.tgz",
       "integrity": "sha512-JeG0rEWak0N6Itr6QUx+X60uQmN+5t3j9r/OVDtWzFXKaj6kD1BwJzOksD0FF6iWxZlbE1kB0q9vtnU2ekqa1Q==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "csstype": "^3.0.2"
@@ -1619,7 +1651,6 @@
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.1.3.tgz",
       "integrity": "sha512-M1uQkMl8rQK/szD0LNhtqxIPLpimGm8sOBwU7lLnCpSbTyY3yeU1Vc7l4KT5zT4s/yOxHH5O7tIuuLOCnLADRw==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/debug": {
@@ -2081,6 +2112,16 @@
         "node": ">=0.8.19"
       }
     },
+    "node_modules/intl-messageformat": {
+      "version": "11.2.8",
+      "resolved": "https://registry.npmjs.org/intl-messageformat/-/intl-messageformat-11.2.8.tgz",
+      "integrity": "sha512-l323RCl3qJDVQ8U9j74ut/hVMdg3VPsOHpVMDvFfz9qiq4dPO5ooVYFNVUzzrpgG39a+RLzcXyJb8VFgIU+tUA==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@formatjs/fast-memoize": "3.1.6",
+        "@formatjs/icu-messageformat-parser": "3.5.11"
+      }
+    },
     "node_modules/is-extglob": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
@@ -2461,6 +2502,21 @@
         "react": "^19.1.0"
       }
     },
+    "node_modules/react-intl": {
+      "version": "10.1.13",
+      "resolved": "https://registry.npmjs.org/react-intl/-/react-intl-10.1.13.tgz",
+      "integrity": "sha512-3aKnIOIPN6CWsu3jqPpYMlJZ2U0Qnxhd42xGWQNdGIknK/gBudWOHSIx9vN4XKkITokJLr7YTgs4yLUGtbvP9g==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@formatjs/icu-messageformat-parser": "3.5.11",
+        "@formatjs/intl": "4.1.13",
+        "intl-messageformat": "11.2.8"
+      },
+      "peerDependencies": {
+        "@types/react": "19",
+        "react": "19"
+      }
+    },
     "node_modules/react-refresh": {
       "version": "0.17.0",
       "resolved": "https://registry.npmjs.org/react-refresh/-/react-refresh-0.17.0.tgz",

package.json

@@ -11,7 +11,8 @@
   },
   "dependencies": {
     "react": "^19.1.0",
-    "react-dom": "^19.1.0"
+    "react-dom": "^19.1.0",
+    "react-intl": "^10.1.13"
   },
   "devDependencies": {
     "@eslint/js": "^9.25.0",

src/App.jsx

@@ -1,45 +1,30 @@
-import React, { useMemo, useCallback, useState } from 'react'
-
-const TodoItem = React.memo(({ item, onToggle, onDelete }) => {
-    console.log(`rendred ${item.id}`);
-    return <li>
-            {item.name}
-            <button onClick={() => onToggle(item.id)}>Done</button>
-            <button onClick={() => onDelete(item.id)}>remove</button>
-        </li>
-})
-
-function ItemList({ items }) {
-
-    const handleToggle = useCallback(id => {
-        items.done = true;
-        console.log(`Item ${id} done`)
-        console.log(id)
-    },[]);
-    
-    const handleDelete = useCallback(id => {
-        items.pop(id);
-    },[]);
-    return (
-        <>
-            <h3>List items</h3>
-            {items.map(item => (
-             <TodoItem key={item.id} item={item}
-              onToggle={handleToggle} onDelete={handleDelete} />
-             ))}
-        </>
-    )
-}
+import { IntlProvider,
+        FormattedMessage,
+        FormattedNumber,
+        FormattedDate,
+        FormattedTime,
+        FormattedDateTimeRange } from 'react-intl'
+import messageRu from './translations/ru.json'
+import messageEn from './translations/en.json'
 
 function App() {
+    const locale = 'ru';
+    const messages = messageEn;
+    
 	return (
 		<>
-			{/* Добавьте тестовый контент для проверки */}
-			<h1>Hello, React!</h1>
-            <ItemList items={[
-                {id:1,name:'Первый',done:false},
-                {id:2,name:'Второй',done:false}
-            ]} />
+            <IntlProvider locale={locale} messages={messages}>
+			    <h1><FormattedMessage id='app.welcome' /></h1>
+                <h2><FormattedMessage id='app.userGreeting' values={{ name: <u>Alex</u> }} /></h2>
+                <p><FormattedMessage id='app.notifications' values= {{count: 25}} /></p>
+                <p><FormattedMessage id='app.lastLogin' values={{ date: new Date(), time: new Date()}} /></p>
+                <p><FormattedNumber value={ 999.99 } style='currency' currency='RUB' /></p>
+                <p><FormattedNumber value={0.56} style='percent' /></p>
+                <p><FormattedNumber value={1234.567} minimumFractionDigits={2} maximumFractionDigits={2} /></p>
+                <p><FormattedDate value={new Date()} weekday='long' /></p>
+                <p><FormattedTime value={new Date()} hour='2-digit' minute='2-digit' second='2-digit' /></p>
+                <p><FormattedDateTimeRange from={new Date(2026,6,1,10,0)} to={new Date(2026,6,10,9,0)} /></p>
+            </IntlProvider>
 		</>
 	)
 }

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>
 )

src/translations/en.json

@@ -0,0 +1,6 @@
+{
+    "app.welcome": "welcome to React application",
+    "app.userGreeting": "Hello, {name}",
+    "app.notifications": "You have {count, plural, one {# a notification} few {# are notifications} many {# уведомлений} other {# уведомления}}",
+    "app.lastLogin": "Last login was {date,date,long} in {time,time,short}"
+}

src/translations/ru.json

@@ -0,0 +1,6 @@
+{
+    "app.welcome": "добро пожаловать в приложение React",
+    "app.userGreeting": "Здравствуйте, {name}",
+    "app.notifications": "У вас {count, plural, one {# уведомление} few {# уведомления} many {# уведомлений} other {# уведомления}}",
+    "app.lastLogin": "Последний вход был {date,date,long} в {time,time,short}"
+}