用于TypeScript的猫鼬导入不起作用 [英] Mongoose Import for TypeScript Doesn't Work

问题描述

节点和打字稿"的新增功能.我在运行tsc时收到mongoose.connect不是函数的错误.

New to Node and Typescript. I am getting an error that mongoose.connect is not a function when I run tsc.

我有以下代码:

import express = require('express');
import * as mongoose from "mongoose";

/** Routes for the app */
import apiUserRouter from "./api/user"

class App{

   public express :express.Application


    constructor() {
        this.express = express()
        this.setupDb();
    }

    private setupDb() : void {
        var mongoDb = 'mongodb://127.0.0.1/my_database';
        mongoose.connect(mongoDb);
        var db = mongoose.connection;
        db.on('error', console.error.bind(console, 'MongoDB Connection error'));
    }
}

如果我改变

import * as mongoose from "mongoose"

到

import mongoose = require('mongoose');

然后一切正常.

我已经为类型运行了以下npm命令，因为我的理解是这应该已经解决了该问题.

I have run the following npm command for types as my understanding is that this should have fixed the issue.

npm install @types/mongoose --save

添加我的packages.json

Adding my packages.json

{
    "name": "nodejs-ts-test2",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
        "test": "echo \"Error: no test specified\" && exit 1"
    },
    "author": "",
    "license": "ISC",
    "devDependencies": {
        "@types/express": "^4.11.1",
        "@types/mongoose": "^5.0.3",
        "typescript": "^2.7.2"
    },
    "dependencies": {
        "express": "^4.16.2",
        "mongoose": "^5.0.7"
    }
}

和tsconfig.json:

and tsconfig.json:

{
    "compilerOptions": {
        "target": "es2015",
        "module": "commonjs",
        "outDir": "dist",
        "strict": true,
        "noImplicitAny": false,
        "esModuleInterop": true,
        "allowSyntheticDefaultImports": true
    }
}

推荐答案

由于您没有共享package.json或tsconfig，因此无法说出错误可能在哪里.因此，我为您共享的代码创建了一个新项目，这样就不会发生该错误.将我共享的文件与您必须缩小问题范围的文件进行比较.

Since you didn't share your package.json or tsconfig, it was not possible to say where the error might be. So I created new project for the code you have shared such that the error does not occur. Compare the files that I am sharing with the ones you have to narrow down your problem.

package.json

{
  "name": "mong_type",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/express": "^4.11.1",
    "@types/mongoose": "^5.0.3",
    "typescript": "^2.7.2"
  },
  "dependencies": {
    "express": "^4.16.2",
    "mongoose": "^5.0.7"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "es2015",
    "module": "commonjs",
    "outDir": "./dist",
    "strict": true,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true
  },
  "include": ["src"]
}

src/app.ts

import express from "express";
import mongoose from "mongoose";

class App {
  public express: express.Application;

  constructor() {
    this.express = express();
    this.setupDb();
  }

  private setupDb(): void {
    var mongoDb = "mongodb://127.0.0.1/my_database";
    mongoose.connect(mongoDb);
    var db = mongoose.connection;
    db.on("error", console.error.bind(console, "MongoDB Connection error"));
  }
}

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