Question

启动服务器时，出现此错误：

this.mongo.connect（'mongodb：// localhost：27017 / tsnode'，{ ^ TypeError：无法读取未定义的属性“ connect”

import express from 'express';
import mongoose from 'mongoose';
import cors from 'cors';

class App {
  public express: express.Application;

  public mongo: mongoose.Mongoose;

  constructor() {
    this.express = express();
    this.database();
    this.middlewares();
    this.routes();
  }

  private middlewares(): void {
    this.express.use(express.json());
    this.express.use(cors());
  }

  private database(): void {
    this.mongo.connect('mongodb://localhost:27017/tsnode', {
      useUnifiedTopology: true,
    });
  }

  private routes(): void {
    this.express.get('/', (req, res) => res.send('Hello World!'));
  }
}

export default new App().express;

Answer 1

您尚未启动mongo变量，因此应在构造函数中执行。喜欢：

  constructor() {
    this.express = express();
    this.mongo= mongoose;  // initialize mongo variable
    this.database();
    this.middlewares();
    this.routes();
  }

猫鼬与打字稿，从猫鼬错误“连接”

1 个答案: