node.js中用typescript连接mongodb数据并设置断开后自动重启连接

Node.js与mongodb可以只创建一条连接以提高性能，如果出现数据连接断开，可以通过侦听“serverHeartbeatFailed”，自动重连，示例代码如下：

import { Db, MongoClient } from 'mongodb'

let client: MongoClient
let database: Db

export const init = async(interval = 2000) => {
 client = new MongoClient('mongodb://localhost/tst')

 try {
 await client.connect()
 database = client.db()

 client.once('serverHeartbeatFailed', (e) => {
   console.log('Database connect error will reconnect again')
   setTimeout(init, interval)
 })
   console.log('Database connected')
 } catch(e) {
   console.log('Database init err will reconnect again')
   setTimeout(init, interval)
 }
}