Answers for "react router dom return undefined"

react router dom return undefined

const history = useHistory()
const location = useLocation()

react router dom return undefined

import { BrowserRouter as Router } from 'react-router-dom'

...

ReactDOM.render(
  <React.StrictMode>

      <Router>
        <App />
      </Router>
  </React.StrictMode>,
  document.getElementById('root')
)