playlistImageUrl(playlist: { id: string; updatedAt?: Date; isPublic?: boolean; },token?: string | null): string
Returns the URL of the cover of playlist, versioned on updatedAt, which a
new cover bumps. A private playlist's URL carries the media token, as for
dumpFileUrl. A public one doesn't, so that its URL is the same for
everyone. A playlist without isPublic counts as public.