Node mongo connection with promises

mongo.js

// npm i mongodb

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

const MONGODB_URI = 'mongodb://localhost:27021/testdata';

let mongoConnection = null;

const getMongo = async () => {
  if (!mongoConnection){
    mongoConnection = await MongoClient.connect(MONGODB_URI, { useNewUrlParser: true, useUnifiedTopology: true });
  }
  return mongoConnection;
}

const getMongoDb = async (name = null) => {
  const mongo = await getMongo();
  return mongo.db(name);
}

const doSomething = async () => {
  const db = await getMongoDb();

  await db.collection('things').insertOne({d:1});

  const rowCount = await db.collection('things').countDocuments();
  
  console.log({ rowCount });
}

exports.getMongo = getMongo;
exports.getMongoDb = getMongoDb;