在 nodejs 的 typescript 类中使用路由器对象时出现异常

Question

I have a nodejs service in typescript. I'm trying to set a separate routing layer in the application.

I have a app.js file where in

let IndividualRoute= require('./routing/IndividualRoute');
app.use('/users', IndividualRoute);

I have create a IndividualRoute.ts file where im trying to use router object like below

import express = require('express');
import individualValidation from '../users/IndividualValidation';
let router = express.Router();

class IndividualRoute {
         router.get('/individualList', individualValidation.list);
}

export = IndividualRoute;

When i try to do the above, i get the below exception

I tried the below things

router.get('/individualList', (request, response) => {
        response.send('Hello world!');
});

But i get the same issue. Also if i remove the class and have a simple file without class then i don't get this exception.

Basically what im trying to do is, if the route matches it should hit the respective function in the IndividualValidation file like in below case

router.get('/individualList', individualValidation.list);

If the route is users/individualList it should hit individualValidation.list function with the request data. Basically im trying to do what is marked as answer in the below link

express.Router() vs. app.get

Any suggestion what i'm doing wrong.

Answer 1

You're writing a class. Inside a class, put the constructor and methods. You can't write code directly here. The line you wrote needs to be in the constructor or in a method.

class IndividualRoute {
      constructor(){
         router.get('/individualList', individualValidation.list);
      }
}

Answer 2

In IndividualRoute.ts , please make the following changes:

import { Router } from 'express';
import individualValidation from '../users/IndividualValidation';
let router = Router();

router.get('/individualList', individualValidation.list);

export default router;

Also, if using typescript, why you have app.js? I'll suggest using typescript for that file also. One more suggestion would be to have index.ts in your routing folder with code:

import { Router } from express;
import IndividualRoute from "./IndividualRoute";

let router = Router();
router.use("/users", IndividualRoute); // set this for each individual route
/*
 * e.g.
 * router.use("/auth", auth);
*/

export default router;

So in your app.ts , all you have to do is:

import * as express from "express";
import routes from "./routing";

let app = express();
app.use(routes);

// other code

I hope you find this helpful!