createEmptyCard

const card: Card = createEmptyCard(new Date());

interface CardUnChecked
  extends Omit<Card, "due" | "last_review" | "state"> {
  cid: string;
  due: Date | number;
  last_review: Date | null | number;
  state: StateType;
}

function cardAfterHandler(card: Card) {
     return {
      ...card,
      cid: "test001",
      state: State[card.state],
      last_review: card.last_review ?? null,
    } as CardUnChecked;
}

const card: CardUnChecked = createEmptyCard(new Date(), cardAfterHandler);