Getting ERR_REQUIRE_ESM with v2.0.0-rc.4

Description

Error [ERR_REQUIRE_ESM]: require() of ES Module /Users/nodejs/project1/node_modules/multer/index.js from /Users/nodejs/project1/src/api/files/files.routes.js not supported.
Instead change the require of index.js in /Users/nodejs/project1/src/api/files/files.routes.js to a dynamic import() which is available in all CommonJS modules.
    at Object.<anonymous> (/Users/nodejs/project1/src/api/files/files.routes.js:3:16)
    at setupRoutes (/Users/nodejs/project1/src/index.js:81:27)
    at main (/Users/nodejs/project1/src/index.js:18:15) {
  code: 'ERR_REQUIRE_ESM'
}

const express = require('express')
const filesController = require('./files.controller')
const multer = require('multer')
const upload = multer({ dest: 'uploads' })

const router = express.Router()

router.post('/upload', upload.single('file'), filesController.upload)
router.get('/download/:filename', filesController.download)

module.exports = router

Contributor guide

Tech stack

javascriptnodejsexpress

Domain

backendapi

Issue type

bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

under 1 hour

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

needs maintainer response

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

clear

Prerequisites

Understanding of Node.js module systemsBasic JavaScript

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

60

Research direction

Investigate why multer v2.0.0 rc.4 causes ERR REQUIRE ESM when required in a CommonJS file. Check the package.json for 'type' field and examine if the source code uses ES modules. Look for any existing discussions or PRs about CJS/ESM compatibility. Propose a solution such as adding a CJS export or providing documentation on dynamic import usage.