connect-db.js

import mongoose from 'mongoose';
import debugLib from 'debug';

const debug = debugLib('server:database');

mongoose.set('strictQuery', false);

export default async (connection, dbName) => {
  try {
    await mongoose.connect(connection, {
      dbName,
      useNewUrlParser: true,
      useUnifiedTopology: true,
      serverSelectionTimeoutMS: 5000,
    });

    const isConnected = mongoose.connection.readyState;

    switch (isConnected) {
      case 0:
        console.log('MongoDB is disconnected');
        break;
      case 1:
        console.log('MongoDB is connected');
        break;
      case 2:
        console.log('MongoDB is connecting');
        break;
      case 3:
        console.log('MongoDB is disconnecting');
        break;
      default:
        console.log('Unknown MongoDB connection status');
    }
    
  } catch (error) {
    debug(error);
  }
};