Typescript mapの型など

sample.md

マップ型を設定する3つの方法

type Things = Map<string, ThingValue>;

interface ThingValue {
  label: string;
  count: number;
}

const things1: Things = new Map();
const things2 = new Map<string, ThingValue>();

// not recommended
const mapFactory = () => new Map<string, ThingValue>();
const things3 = mapFactory();