// app/router/index.tsx import createBrowserRouter from 'react-router-dom'; import lazy, Suspense from 'react'; const DashboardPage = lazy(() => import('@/features/dashboard/pages/DashboardPage')); const ProductsPage = lazy(() => import('@/features/products/pages/ProductsPage')); const NotFoundPage = lazy(() => import('@/shared/ui/NotFoundPage'));

export const useAuthStore = create<AuthStore>((set) => ( user: null, isAuthenticated: false, login: (user) => set( user, isAuthenticated: true ), logout: () => set( user: null, isAuthenticated: false ), )); Never call fetch or axios directly inside a component. Build a structured data layer:

); // features/products/hooks/useProducts.ts import useQuery from '@tanstack/react-query'; import apiClient from '@/shared/api/client'; export const useProducts = () => return useQuery( queryKey: ['products'], queryFn: () => apiClient.get('/products').then(res => res.data), staleTime: 5 * 60 * 1000, // 5 minutes ); ; 6. Routing and Code Splitting Use lazy loading at the route level to split your bundle:

// Button.tsx import styles from './Button.module.css'; export const Button = ( children ) => ( <button className=styles.button>children</button> );

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