javascript - 语法错误 : Unexpected token * after importing sequelize model db object

Question

我正在开发一个应用程序，我必须使用 Sequelize 在 SQL 服务器上连接和执行查询。我已经使用 sequelize init 创建了迁移、播种和模型，但是现在当我尝试使用 const db = require("./models") 创建模型对象时，它抛出了类似的错误

D:\Code Practice\express-sequelize-demo\node_modules\tedious\lib\token\stream-parser.js:85
  static async *parseTokens(iterable, debug, options, colMetadata = []){
SyntaxError: Unexpected token *
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:616:28)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (D:\Code Practice\express-sequelize-demo\node_modules\tedious\lib\token\token-stream-parser.js:10:44)

我创建的文件

package.json

{
  "name": "express-sequelize-demo",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "start": "nodemon app.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.1",
    "mssql": "^7.1.0",
    "sequelize": "^6.6.2",
    "tedious": "^11.0.9"
  },
  "devDependencies": {
    "nodemon": "^2.0.7"
  }
}

app.js

const express = require("express");
const app = express();
const PORT = 8088;

// throwing error here after importing
const db = require("./models");

app.get("/users", (req, res) => {
  res.send({
    status: 1,
    message: "Hello from User",
  });
});

app.get("/", (req, res) => {
  res.send({
    status: 1,
    message: "Welcome to Home Page",
  });
});

app.listen(PORT, () => {
  console.log(`App is running on ${PORT}`);
});

模型/index.js

"use strict";

const fs = require("fs");
const path = require("path");
const Sequelize = require("sequelize");
const basename = path.basename(__filename);
const env = process.env.NODE_ENV || "development";
const config = require(__dirname + "/../config/config.json")[env];
const db = {};

let sequelize;
if (config.use_env_variable) {
  sequelize = new Sequelize(process.env[config.use_env_variable], config);
} else {
  sequelize = new Sequelize(
    config.database,
    config.username,
    config.password,
    config
  );
  console.log(sequelize);
}

fs.readdirSync(__dirname)
  .filter((file) => {
    return (
      file.indexOf(".") !== 0 && file !== basename && file.slice(-3) === ".js"
    );
  })
  .forEach((file) => {
    const model = require(path.join(__dirname, file))(
      sequelize,
      Sequelize.DataTypes
    );
    db[model.name] = model;
  });

Object.keys(db).forEach((modelName) => {
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});

db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = db;

模型/user.js

'use strict';
const {
  Model
} = require('sequelize');
module.exports = (sequelize, DataTypes) => {
  class User extends Model {
    static associate(models) {
      // define association here
    }
  };
  User.init({
    first_name: DataTypes.STRING,
    last_name: DataTypes.STRING,
    bio: DataTypes.TEXT
  }, {
    sequelize,
    modelName: 'User',
  });
  return User;
};

5)配置文件

{
  "development": {
    "username": "SA",
    "password": "Password123",
    "database": "database_development",
    "host": "localhost",
    "dialect": "mssql"
  },
  "test": {
    "username": "root",
    "password": "Password123",
    "database": "database_test",
    "host": "127.0.0.1",
    "dialect": "mssql"
  },
  "production": {
    "username": "root",
    "password": "Password123",
    "database": "database_production",
    "host": "127.0.0.1",
    "dialect": "mssql"
  }
}

Answer 1

我已经通过更新 Node 版本解决了这个问题。
这里的问题是当我尝试使用创建 Sequelize 实例时

const sequelize = new Sequelize(DB connection params); //pass the actual db config

它抛出了那个错误。

SyntaxError: Unexpected token *

但是经过一番研究，我将我的 Node 版本从 8.11.4 更新到 14.17.0，并且成功了。现在没有任何错误，我可以运行我的应用程序并且它按预期工作。