How to replace `require` function while upgrading a NodeJS project to TypeScript?

Question

I am trying to modify an existing NodeJS project from JavaScript to TypeScript but I don't know how to deal with require expressions like below:

const indexRouter = require('../routes/index');

const config = require('./config');

EDIT: This is the index.ts dile:

import express, {Request, Response, NextFunction} from 'express';
const router = express.Router();

/* GET home page. */
router.get('/', function(req: Request, res: Response, next: NextFunction) {
  res.render('index', { title: 'Express' });
});

export default router;

score 1 · Accepted Answer · 2022-04-19 00:34:44Z

1

You don't have to change that lines. TypeScript understands CommonJS modules with the according configuration. But since you want to replace them, I assume you want to use ES6 modules.

It's

import indexRouter from '../routes/index';

import config from './config';

edited Apr 19, 2022 at 0:34

answered Apr 19, 2022 at 0:13

user16540390

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5 Comments

lovecode Over a year ago

Thank you, I did your suggestion and seems it works but on a new line of code app.use('/', indexRouter); I get a new error

lovecode Over a year ago

No overload matches this call.   The last overload gave the following error.     Argument of type 'typeof import("c:/Users/A/Desktop/backend/src/routes/index")' is not assignable to parameter of type 'Application<Record<string, any>>'.       Type 'typeof import("c:/Users/A/Desktop/backend/src/routes/index")' is missing the following properties from type 'Application<Record<string, any>>': init, defaultConfiguration, engine, set, and 61 more.

lovecode Over a year ago

I also added the content of `index file.

user16540390 Over a year ago

@WDR I've edited my answer. Your export statement is not equivalent to the CommonJS export and since you didn't post the export, I assumed a CommonJS equivalent export.

lovecode Over a year ago

I added an EDIT part to the end of my question,

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