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我在mongodb连接的变量赋值中得到一个TypeError.这有解决方法吗？

//server.js
var mongoose = require('mongoose');
var config = require('./config');

var { db: {user,pass,host,port,name } } = config;

var connectionString = `mongodb://${user}:${pass}@${host}:${port}/${name}`;

mongoose.connect(connectionString, { useMongoClient: true });

错误

C:\mean\webguidv1\server.js:65
  db: {
  ^

TypeError: Cannot destructure property `db` of 'undefined' or 'null'.

这是我的config.js文件

// config.js
var env = process.env.NODE_ENV; // 'dev' or 'test'

var dev = { app: { port: 3000 }, db: {user: '', pass: '', host: '', port: , name: '' }};

var test = { app: { port: …