function pluck<T, K extends keyof T>(source: T, key: K): Record<K, T[K]> {
  return { [key]: source[key] } as Record<K, T[K]>;
}

function pluck<T, K extends keyof T>(source: T, key: K): Pick<T,K> {
  return { [key]: source[key] } as Pick<T,K>;
}