const { MongoClient } = require('mongodb');

const repro = () => {
  const client = new MongoClient('mongodb://127.0.0.1:27017');
  client.connect((error) => {
    const db = client.db('test');
    const collection = db.collection('test');
    client.close(() => {
      // This will throw an error instead of passing in the callback.
      collection.find().toArray((err) => {
        console.log(err);
      });
    });
  });
}

repro();