内联 type 导入

TypeScript 4.5 还允许单个导入以 type 为前缀，以指示导入的引用是一种类型：

TypeScript 4.5 also allows for individual imports to be prefixed with type to indicate that the imported reference is a type:

// @filename: animal.ts
export type Cat = { breed: string; yearOfBirth: number };
export type Dog = { breeds: string[]; yearOfBirth: number };
export const createCatName = () => "fluffy";

// @filename: app.ts
import { createCatName, type Cat, type Dog } from "./animal.js";

export type Animals = Cat | Dog;
const name = createCatName();

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