how to export switch from react-router-dom
let routes = (
<Fade>
<Switch>
{/* there will only ever be one child here */}
<Route />
<Route />
</Switch>
</Fade>
);
let routes = (
<Fade>
{/* there will always be two children here,
one might render null though, making transitions
a bit more cumbersome to work out */}
<Route />
<Route />
</Fade>
);