React-router-dom

App.tsx

import React from 'react';
import { BrowserRouter as Router, Switch, Route } from 'react-router-dom';

import Header from './components/Header';
import Reponame from './pages/Reponame';
import Profile from './pages/Profile';

function App() {
  return (
    <Router> 
      <Header />

      <Switch>
          <Route exact path="/">
            <Profile />
          </Route>
          <Route exact path="/:username">
            <Profile />
          </Route>
          <Route path="/:username/:reponame">
            <Reponame />
          </Route>
        </Switch>

      {/* <Footer /> */}
    </Router>
  );
}

export default App;