video-list-2.tsx

type Props = {
  items: Array<Video | LiveStream>
}

const VideoList = ({ items }) => {
  return (
    <ul>
      {items.map(item => {
        if ('coverUrl' in item) {
          // it's a video
          return <Thumbnail video={item} />
        } else {
          // it's a live stream, but what can we do with it?
        }
      })}
    </ul>
  )
}