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【TypeScript】フォルダごとにindex.tsを配置して一括import

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下記のようなディレクトリ構成のプロジェクトがあるとする。

│  main.ts
│
├─repository
│      index.ts
│      PostRepository.ts
│      UserRepository.ts
│
└─service
        index.ts
        LoggerService.ts
        PostService.ts
        UserService.ts

各フォルダにindex.tsを配置してそのフォルダ配下のmoduleをexportする。

たとえばservice/index.ts

service/index.ts
export { LoggerService } from "./LoggerService";
export { PostService } from "./PostService";
export { UserService } from "./UserService";

と記述しておく。
そうするとディレクトリトップにあるmain.tsはフォルダ名のみでimportできる。

main.ts
import { LoggerService, UserService } from './service';

const logger = new LoggerService();
const userService = new UserService();

const newUser = new User("stin_factory", 25);
userService.register(newUser);
logger.log(`${newUser.name}を新規登録しました。`);

記述が簡素化されて読みやすくなる。

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