React Router, why useLocation and useHistory might return undefined

I was having some head scratching moment when using the useLocation and useHistory hooks with React Router.

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

They both returned undefined.

Turns out I was adding the Router to the DOM with <Router>...</Router> in the same component I was using useLocation and useHistory.

Then I found this issue that explained I could not do that.

I had to move the <Router>...</Router> wrapping of my component one level up. In my case, I did that in the index.js file:

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



        <App />

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