typescript global variables are not functioning as expected

Encountering an issue with the signin function implementation in my application. Despite having a global declaration for this function, I am getting an error stating 'Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature.' Tried multiple solutions without success. Any assistance in resolving this problem would be greatly appreciated.

import request from 'supertest';
import { app } from '../app';

declare global {
  namespace NodeJS {
    interface Global {
      signin: () => Promise<string[]>;
    }
  }
}

global.signin = async () => {
  const email = '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0b7f6e787f4b7f6e787f25686466">[email protected]</a>';
  const password = 'password';

const response = await request(app)
    .post('/api/users/signup')
    .send({
      email,
      password
    })
    .expect(201);

  const cookie = response.get('Set-Cookie');

  return cookie;
};

it('responds with details about the current user', async () => {
  const cookie = await global.signin();

  const response = await request(app)
    .get('/api/users/currentuser')
    .set('Cookie', cookie)
    .send()
    .expect(200);

  expect(response.body.currentUser.email).toEqual('<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="dbafbea8af9bafbea8aff5b8b4b6">[email protected]</a>');
});

Answer №1

It appears that the issue we are encountering is related to TypeScript's strict type-checking. TypeScript is giving us trouble because it cannot identify the type of globalThis as having an index signature, which is necessary for recognizing that we are adding a property (signin) to it.

To address this issue, we need to provide TypeScript with a more clear understanding. One way to do this is by explicitly stating that the global object can have any kind of property. By casting global as any, we are essentially saying, "Hey TypeScript, relax a little on the strict typing here, we believe that global can handle whatever we assign to it."

Here is what I believe should work:

// Update the global declaration
declare global {
  namespace NodeJS {
    interface Global {
      signin: () => Promise<string[]>; // Your signin function signature
    }
  }
}

// Replace `global` with `any`
(global as any).signin = async () => {
  // Keep your signin function implementation unchanged
};

This approach should resolve the issue! By explicitly casting global as any, we are instructing TypeScript to be less strict and trust our judgment. This adjustment should fix the error and allow our signin function to operate smoothly as intended.

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