我有安装了dotenv的node.js应用程序，并在.env文件中添加了以下配置

 DB_HOST='localhost'
 DB_Database=TheDatabasename
 DB_USER=TheUser
 DB_PASS=thePassword
 DB_PORT=1433

我正在使用sqlserver，像下面这样叫dotenv：

const sql = require('mssql');
const dotenv = require('dotenv');
dotenv.config();

const config = {
 user: process.env.DB_USER,password: process.env.DB_PASS,server: process.env.DB_HOST,database: process.env.DB_Database,port: process.env.DB_PORT,}

 const poolPromise = new sql.ConnectionPool(config)
.connect()
.then(pool => {
 console.log('Connected to MSSQL')
 return pool
})
 .catch(err => console.log('Database Connection Failed! Bad Config: ',err))

 module.exports = {
  sql,poolPromise
 }

我收到以下错误：

  Database Connection Failed! Bad Config:  TypeError: The "config.options.port" property must be of type number.