JAVASCRIPT

React Router rendering blank pages for all components

<Switch>
  <Route
    path="/login"
    render={props => !isAuthenticated
      ? (
        <Login setAuth={setAuth} {...props} />
      ) : (
        <Redirect to="/dashboard" />
      )     
    }
  />
  <Route
    path="/register"
    render={props => !isAuthenticated
      ? (
        <Register setAuth={setAuth} {...props} />
      ) : (
        <Redirect to="/dashboard" />
      )
    }
  />
  <Route
    path="/dashboard"
    render={props => isAuthenticated
      ? (
        <Dashboard setAuth={setAuth} {...props} />
      ) : (
        <Redirect to="/login" />
      )
    }
  />
</Switch>

//update

const [isAuthenticated, setIsAuthenticated] = useState();

if (isAuthenticated === undefined) {
  return null; // or loading spinner, etc...
}

return (
  ... routes & UI ...
);