Using supertest in TypeScript - Getting problem "cannot invoke expression whose type lacks a call signature"

Question

I am trying to use supertest with TypeScript after initially using with JavaScript.

However I am now receiving red squiggles under my code stating:

cannot invoke expression whose type lacks a call signature. Type 'typeof supertest' has no compatible call signatures

I am using supertest in the following way:

import * as supertest from 'supertest';

const request = superTest(some.url);

// Forgive my pseudocode
function makeRequest() {
  return request.get('/endpoint')...
}

Is this something I should be worried about? How can I correct this?

Answer 1

I had the @types/supertest added (as suggested by the other answer) but doing the following solved the problem:

1. import supertest like this:

   import supertest from 'supertest';
   

2. in my index.ts file, export the value of app.listen(...); like following (previously it was export default server):

   export {server};