typescript definitions for mongodb not working?

Question

everybody, what I must install for mongodb to work in angular 4?
in my angular 4 project db is object of client of MongoClient class as this code:

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

when I write db.collection() inside this code:

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

in app.module.ts file I get this error:

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

where DbClient is class defined in my database file.
in this project I have nodejs: 8.10.0 mongodb version 2.2.33 and @type/mongodb: 3.0.9, this version of mongodb was 3.0.5 I have downloaded older version after search for solution but still not working yet.
please anybody can help me to solve this error?

I think you should pass collection name. db.collection('test'); — Krishna
– Krishna, Commented Mar 27, 2018 at 19:19
thanks for replay, I think when the error is about argument I must get Expected 1-3 arguments, but got 0, I tried to give the name but not solved. @Krishna — Kasoir Abbas
– Kasoir Abbas, Commented Mar 27, 2018 at 19:26

Cyril Gandon · Accepted Answer · 2018-03-28 13:30:15Z

3

DbClient.connect(); connects the variable DbClient, and returns nothing. So when you try to write let db = DbClient.connect();, TypeScript correctly alerts you that db is a void variable with no methods.

I think you want:

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

Or

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

answered Mar 28, 2018 at 13:30

Cyril Gandon

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1 Comment

Kasoir Abbas Over a year ago

then how I can use the variable db in another class or file in the same project? if not returned any thing?

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