警告：在循环依赖中访问不存在的属性 'sequelize' 模块导出

Question

问题

nodemon server.js

[nodemon] 2.0.15

[nodemon] to restart at any time, enter `rs`

[nodemon] watching path(s): *.*

[nodemon] watching extensions: js,mjs,json

[nodemon] starting `node server.js`

Warning: connect.session() MemoryStore is not
designed for a production environment, as it will leak
memory, and will not scale past a single process.     
(node:11528) Warning: Accessing non-existent property 'sequelize' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
Server running at port: 8000

可以运行正常访问网站。但是我该如何解决呢？

ps。每次你运行号码都是独一无二的。 --> (节点:11528)

其他问题

当我使用 --> "node --trace-warnings sequelize"

PS C:\Users\company\Desktop\Project> node --trace-warnings sequelize
node:internal/modules/cjs/loader:936
  throw err;
  ^

Error: Cannot find module 'C:\Users\company\Desktop\Project\sequelize'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

当我使用 --> "nodemon -e js,ejs index.js"

[nodemon] 2.0.15
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,ejs
[nodemon] starting `node index.js index.js`
node:internal/modules/cjs/loader:936
  throw err;
  ^

Error: Cannot find module 'C:\Users\company\Desktop\Project\index.js'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}
[nodemon] app crashed - waiting for file changes before starting...

"node --trace-warnings sequelize" and "nodemon -e js,ejs index.js" : 网站无法正常运行。但是我该如何解决呢？

节点：v16.13.1 续集：v6.12.4 Nodemon：v2.0.15 数据库：mySQL

代码server.js

require('dotenv').config()

const express = require('express')
const app = express()

const appRoutes = require('./routes')

const { sequelize } = require("./models")

const appSchedule = require("./schedules")

const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser');
const session = require('express-session');
const passport = require('passport');


app.use(cookieParser("secret"));

//config session
app.use(session({
   secret: 'secret',
   resave: true,
   saveUninitialized: false,
   cookie: {
      maxAge: 1000 * 60 * 60 * 24 // 86400000 = 1 day
   }
}));

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));

//Config passport middleware
app.use(passport.initialize());
app.use(passport.session());

sequelize.sync().then(() => {
    
    // static resources
    app.use(`/public/`, express.static('public'))

    // ejs view
    app.set('views', 'views')
    app.set('view engine', 'ejs')

    // app route
    app.use(express.json())
    app.use(express.urlencoded({
        extended: true
    }))
    app.use(`/`, appRoutes)

    // start schedule
    appSchedule.start()
    // listen connection
    app.listen(process.env.PORT, () => {
        console.log(`Server running at port: ${process.env.PORT}`)
    })    
}).catch((error) => {
    console.error(error)
})

这是第一个问题。如果有任何错误，在此表示歉意。

谢谢。

Answer 1

有几个问题

当您运行 --trace-warnings 时，您指向的是一个不存在的文件。您需要运行它在同一个文件中，例如node --trace-warnings server.js.
nodemon 调用遇到了类似的问题，您可以尝试 nodemon -e js,ejs server.js 看看输出是什么
这是导致您出现问题的行。该错误表明 sequelize 未从此文件中导出。也许你的意思是 const sequelize = require('./models')？您必须包含 ./models 中的代码才能确定

const { sequelize } = require("./models")

警告：在循环依赖中访问不存在的属性 'sequelize' 模块导出

Warning: Accessing non-existent property 'sequelize' of module exports inside circular dependency

javascript

node.js

sequelize.js

nodemon

警告：在循环依赖中访问不存在的 属性 'sequelize' 模块导出

Warning: Accessing non-existent property 'sequelize' of module exports inside circular dependency

javascript

node.js

sequelize.js

nodemon

警告：在循环依赖中访问不存在的属性 'sequelize' 模块导出