Unexpected identifier 'express'. import call expects one or two arguments

Question

I'm currently building an express server with typescript and Bun and just created my register route:

import express from "express";

const router = express.Router();
router.get('/registerUser',(_req:express.Request,res:express.Response): void => {
    res.send('Hello World');
});


module.exports = router;

index.ts:

SERVER.use('/pmo/api/v1/auth', require('./controllers/auth_controllers/register.controller.ts'));

Here is my tsconfig file:

  "compilerOptions": {
    "lib": ["ESNext"],
    "module": "esnext",
    "target": "esnext",
    "moduleResolution": "bundler",
    "moduleDetection": "force",
    "allowImportingTsExtensions": true,
    "noEmit": true,
    "composite": true,
    "strict": true,
    "downlevelIteration": true,
    "skipLibCheck": true,
    "jsx": "react-jsx",
    "allowSyntheticDefaultImports": true,
    "forceConsistentCasingInFileNames": true,
    "allowJs": true,
    "types": [
      "bun-types" // add Bun global
    ]
  }
}

I tried to google solutions and read forums but could not find anyone that had the same problem, all of them had a solution of putting type="module" in the script tag, but I do not have an HTML file, instead I have type="module" in my package.json file.

Answer 1

Change this:

const router = express.Router();

to this:

export const router = express.Router();

and delete this:

module.exports = router;

You cannot use module.exports in ES6 when you define type="module" in your package.json file. You need to use the export keyword instead.

Please make sure you have run bun add express beforehand.