typescript node.js express路由分离的文件最佳实践

在Node项目中使用Express以及Typescript，这将是Express的"最佳实践"。路由器。

示例目录结构

|directory_name
  ---server.js
  |--node_modules
  |--routes
     ---index.ts
     |--admin
        ---admin.ts
     |--products
        ---products.ts
     |--authentication
        ---authentication.ts

因此在index.ts中，它将封装并管理所有的子路由器

    //admin.ts (nested inside of index.ts)
    import * as express from "express";
    export = (() => {
        
        let router = express.Router();
        router.get('/admin', (req, res) => {
            res.json({success: true});
        });
        
        return router;
    })();
    //index.ts (master file for express.Router)
    import * as express from "express";
    //import sub-routers
    import * as adminRouter from "./admin/admin";
    import * as productRouter from "./products/products";
    export = (() => {
      let router = express.Router();
      // mount express paths, any addition middleware can be added as well.
      // ex. router.use('/pathway', middleware_function, sub-router);
      router.use('/products', productRouter);
      router.use('/admin', adminRouter);
      //return for revealing module pattern
      return router;
    })(); //<--- this is where I don't understand something....
最后，我们将设置我们的服务器.js

    //the usual node setup
    //import * as *** http, body-parser, morgan, mongoose, express <-- psudocode
    import * as masterRouter from './routes/index'
    var app = express();
    //set-up all app.use()
    app.use('/api', masterRouter);
    http.createServer(app).listen(8080, () => {
          console.log('listening on port 8080')
        };
我的主要问题是，是index.ts（主路由器文件），它是IIFe的嵌套路由
export=（function（）｛｝）（）；
这应该是为路由器编写typescript模块的正确/最佳方式吗？
还是最好使用另一种模式，也许是使用模式的模式
导出函数fnName（）｛｝--导出类cName｛｝-导出默认值。
IIFe的原因是，当我将它们导入另一个文件时，我不需要初始化模块，并且每种类型的路由器只有一个实例。

  import * as express from "express";
  // import sub-routers
  import * as adminRouter from "./admin/admin";
  import * as productRouter from "./products/products";
  let router = express.Router();
  // mount express paths, any addition middleware can be added as well.
  // ex. router.use('/pathway', middleware_function, sub-router);
  router.use('/products', productRouter);
  router.use('/admin', adminRouter);
  // Export the router
  export = router;