ktyr report

型

type Order = {
    id : number;
    title? : string;
    price : number;
};

　
変数

const firstOrder : Order = {
    id : 1,
    title : "あいうえお",
    price : 256,
};

　
下記もok

const secondOrder : Order = {
    id : 1,
    price : 256,
};