What is preventing me from adding members to an imported declaration?

Currently, I am attempting to include a constructor in an imported declaration. As per the information provided in the documentation, this should be feasible. (Refer to Chapter Adding using an interface)

Below is the code snippet that I have used:

import { ObjectID } from 'mongodb';

interface ObjectID {
  new(b: Buffer): ObjectID;
}

An error message that reads as follows is displayed:

The import declaration conflicts with the local declaration of 'ObjectID' at line 2 col 10.

To address this issue temporarily, I decided to change the name of the interface and utilized type assertion to any before finally switching to my desired interface. This solution suffices for now since it is only required in one specific location, but I am still curious as to why the initial method did not work as expected.

Answer №1

It appears that you are both importing and declaring locally, resulting in an accurate error message. When dealing with imported code, it's best to create a declaration file instead. You can learn more about this process here.

However, in the case of mongodb, it seems like you may not need to create a declaration file as definition files already exist. Simply run the following command:

npm install @types/mongodb --save-dev

This will provide all the necessary declarations for you. For reference, here is the constructor in question: Here's the constructor.

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