zeit now 2.0 mongodb connection

connection.js

let cachedMongoClient = null;
let cachedMongoDb = null;

exports.connect = async () => {

    if (cachedMongoDb && cachedMongoClient && cachedMongoClient.isConnected()) {
        return cachedMongoDb;
    }

    cachedMongoClient = await MongoClient.connect('MONGO_CONNECTION', { useNewUrlParser: true });
    cachedMongoDb = cachedMongoClient.db();
    return cachedMongoDb;
}

index.js

const { connect } = requie('./connection');

const handler = async (req, res) => {
    
    const db = await connect();

    res.send(await db.findOne({ user: 'Mikkel' }));
};

module.exports = handler;