StoreUtil's when add-on usage

import when from 'store-util/when';
import { Spinner, Campaign } from 'components';

[...]

render() {
  var campaign = this.state.campaign;

  return (
    <div>
      {when(campaign, {
        retrieving: <Spinner />,
        done: <Campaign {...{campaign}} />
      })}
    </div>
  );
}