Mongoose: Cannot read property '_promiseOrCallback' of undefined

[shhlkien]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When I call connect from mongoose, it throws an exception

TypeError: Cannot read property '_promiseOrCallback' of undefined
    at Mongoose.connect

If the current behavior is a bug, please provide the steps to reproduce.

Code:

const { connect } = require('mongoose');

async function main() {

  try {
      await connect(env.DB_CONNECTION_STRING, {
        useNewUrlParser: true,
        useUnifiedTopology: true,
        user: env.DB_USER,
        pass: env.DB_PWD,
      });
  }
  catch (err) {
    console.error(err);
  }
}

main();

What is the expected behavior?
Mongoose create connect successfully

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.
Node.js: v12.18.4
Mongoose: v5.10.15
Mongodb: v4.4.1

[AbdelrahmanHafez]

Welcome @shhlkien

I can confirm that this is a bug, we'll fix this in 5.10.18.
Meanwhile, you can use mongoose.connect instead of connect to fix the issue you're facing.

const mongoose = require('mongoose');

async function main() {

  try {
    await mongoose.connect(env.DB_CONNECTION_STRING, {
      useNewUrlParser: true,
      useUnifiedTopology: true,
      user: env.DB_USER,
      pass: env.DB_PWD
    });
  }
  catch (err) {
    console.error(err);
  }
}

main();

[shhlkien]

Ok. Thank you for fast reply