Could it be that the TypeScript definitions for MongoDB are not functioning properly?

Hello everyone, I'm facing an issue with getting MongoDB to work in my Angular 4 project. In my code, I have the db object as a client of the MongoClient class:

MongoClient.connect('mongodb://localhost:27017/test', (err, client) => {
            // Client returned
            var db = client.db('test');});

However, when I try to use db.collection(), I encounter this error:

let db = DbClient.connect();
      db.collection();

In my app.module.ts file, I receive the following error message:

"[ts] Property 'collection' does not exist on type 'void'."

The project uses Node.js version 8.10.0, MongoDB version 2.2.33, and @type/mongodb version 3.0.9. I even tried downgrading to version 3.0.5 after searching for a solution, but unfortunately it's still not working. Can anyone offer assistance in resolving this error?

angularmongodbtypescript

Answer №1

DbClient.connect(); function connects the variable DbClient, but does not return anything. This means that if you write let db = DbClient.connect();, TypeScript will correctly point out that db is a void variable without any methods.

A better approach would be:

DbClient.connect();
DbClient.collection();

Alternatively, you could use:

MongoClient.connect('mongodb://localhost:27017/test', (err, client) => {
    // Client successfully returned
    var db = client.db('test');
    db.collection();
});

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