React Router v6 - How to conditionally render components based on user roles without triggering unnecessary renders?
I'm following best practices but After trying multiple solutions online, I still can't figure this out... After trying multiple solutions online, I still can't figure this out. I'm working with React Router v6 and trying to conditionally render different components based on user roles. The problem arises when I switch between roles; the component that should render for the new role doesn't update properly. I have a setup where I fetch user data (including roles) on app load and store it in a context provider. However, every time the user role changes, the entire tree seems to re-render instead of just the component that depends on the role. Here’s a simplified version of my code: ```javascript import { createContext, useContext, useState, useEffect } from 'react'; import { BrowserRouter as Router, Routes, Route } from 'react-router-dom'; const UserContext = createContext(); const UserProvider = ({ children }) => { const [user, setUser] = useState(null); useEffect(() => { // Simulating a fetch call to retrieve user data const fetchUser = async () => { const userData = await getUserData(); // Assume this fetches user data setUser(userData); }; fetchUser(); }, []); return <UserContext.Provider value={user}>{children}</UserContext.Provider>; }; const AdminComponent = () => <div>Admin View</div>; const UserComponent = () => <div>User View</div>; const App = () => { const user = useContext(UserContext); return ( <Router> <Routes> <Route path="/" element={user?.role === 'admin' ? <AdminComponent /> : <UserComponent />} /> </Routes> </Router> ); }; const getUserData = async () => { // Simulate a delay and return user data return new Promise(resolve => { setTimeout(() => { resolve({ role: Math.random() > 0.5 ? 'admin' : 'user' }); }, 1000); }); }; export default () => ( <UserProvider> <App /> </UserProvider> ); ``` When I change the user role, the whole app seems to re-render instead of just the component related to that role. The admin view is still showing the user view for a brief moment before it updates, causing a flicker. I’ve tried using `React.memo` on `AdminComponent` and `UserComponent`, but it didn't seem to help. Is there a better way to handle this role-based rendering that minimizes unnecessary re-renders? Any suggestions would be appreciated! I'm working on a application that needs to handle this. Has anyone else encountered this? For context: I'm using Javascript on Windows. How would you solve this? This is part of a larger microservice I'm building. Any suggestions would be helpful.