¿Cómo obtener la lista de colecciones en mongoose?

De hecho, mongoose.connection.db.collectionNames se eliminó a favor de mongoose.connection.db.listCollections .

const mongoose = require('mongoose');

const connection = mongoose.connect('mongodb://localhost:27017');

connection.on('open', function () {
    connection.db.listCollections().toArray(function (err, names) {
      if (err) {
        console.log(err);
      } else {
        console.log(names);
      }

      mongoose.connection.close();
    });
});