DatabaseService connection with typescript and mongoose

DatabaseService.ts

import config, { IConfig } from 'config';
import mongoose, { Mongoose } from 'mongoose';
import {EventEmitter} from"events"
const dbConfig: IConfig = config.get('App.database');
import Logger from'./lib/logger'



class DatabaseService {
  public static emitter: EventEmitter = new EventEmitter();
  public static isConnected = false;
  public static logger: any = new Logger();

  public static async getConnection(callback = null, wait = false) {
    DatabaseService.handleConnectionError();
    return await DatabaseService.createConnection();
  }

  public static async createConnection() {
    const dbConfig = config[`${process.env.ENV}`];
    return await mongoose.connect(dbConfig.get('mongoUrl'), {
      useCreateIndex: true,
      useNewUrlParser: true,
      useUnifiedTopology: true,
    }).then(() => {
      DatabaseService.isConnected = true;
      DatabaseService.logger.log('info', 'database connected successfully');
    }).catch((err: Error) => {
      DatabaseService.logger.log('info', 'database connection error...retrying');
      DatabaseService.emitter.emit('DB_CONNECT_ERROR');
    });
  }
  public static async handleConnectionError() {
    DatabaseService.emitter.on('DB_CONNECT_ERROR', async () => {
      DatabaseService.logger.log('info', 'database connection error...retrying');
      setTimeout(async () => {
        await DatabaseService.createConnection();
      }, 3000)
    });
  }
}

export { DatabaseService };