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

Question

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?

angular mongodb typescript

Answer 1

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();
});

Answer 2

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();
});

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

Answer №1

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