Router.use() 需要一个中间件函数，但未定义 socket.io 和 mocha答案

【问题标题】：Router.use() requires a middleware function but got a undefined with socket.io and mochaRouter.use() 需要一个中间件函数，但未定义 socket.io 和 mocha
【发布时间】：2020-07-14 03:44:26
【问题描述】：

我是使用 NodeJS 和 mocha 的 socket.io 的初学者。使用 socket.io 客户端和服务器后，出现以下错误

Router.use() requires a middleware function but got a undefined 在项目构建期间。以下是文件和代码详细信息

后端/main.ts

const app = express()
const http = require('http').createServer(app)
...

app.use('/api', require('./routes/api'))

...

export const io = require('socket.io')(http)
io.listen(http)
io.on('connection', (client: SocketIO.Socket) => {
  // eslint-disable-next-line no-console
  console.log('Socket open Connection')
  client.on('disconnect', () => {
    // eslint-disable-next-line no-console
    console.log('socket disconnect')
  })
})
...

后端/路由/api/index.ts

const router = Router()

// Global middleware for all /api routes

router.use('/ping', ping)
router.use('/crm', isLoggedIn, ensureAccessToken, crmSource)
router.use('/app', isLoggedIn, ensureAccessToken, app)
router.use('/app-users', isLoggedIn, ensureAccessToken, ensureIsGlobalTeamMember, appUsers)
router.use('/business', isLoggedIn, ensureAccessToken, ensureIsAdmin, business)
router.use('/app-offers', isLoggedIn, ensureAccessToken, appOffers)
router.use('/app-contracts', isLoggedIn, ensureAccessToken, appContracts)
router.use('/app-order', isLoggedIn, ensureAccessToken, appOrders)
router.use('/app-export', isLoggedIn, ensureAccessToken, appDetailsExport)
router.use('/app-global-settings', isLoggedIn, ensureAccessToken, appGlobalSettings)

if (config.environment === 'local' || config.environment === 'dev') {
  router.use('/translations', translationRoutes)
}

// Non-existent API routes should return 404, not the HTML page
router.use((_req, res) => {
  res.status(404).end()
})

// export default router
module.exports = router

后端/路由/api/crmSource/ts

const router = Router()
router.get('/', (req: ApiRequest, res: Response) => { ... } )
router.get('/source/number/:sourceNumber', (req: ApiRequest, res: Response) => { ... } )
...
export default router

后端/路由/api/appUsers.ts

const router = Router()

router.post(...)
router.delete(...)

export default router

全局中间件路由器中的所有其他中间件都以相同的方式编写。

当我从 main.ts 导入 io 以在以下文件中进行套接字通信时 checkout-offer.ts

import {io as socketIoConnection} from './main'
...


function checkoutOffer(db, logger, offer, token) {
    socketIoConnection.emit('saveOffer')
    await db.saveCheckoutOffer(offer, logger, token)
    socketIoConnection.emit('offerCheckedOut')
    return db.getCheckedOffer(db, updatedOffer.id)
}
...

我在使用 mocha 的测试版本中遇到以下错误。没有运行 mocha 测试的套接字实现在应用程序中运行得非常好。但是在运行npm run test 时出现此错误。

> myproject@1.0.0 test /Users/<user>/myproject
> npm-run-all --sequential test:unit lint test:api test:browser


> myproject@1.0.0 test:unit /Users/<user>/myproject
> NODE_ICU_DATA=node_modules/full-icu mocha "test/unit/**/*test.{tsx,ts}"

ERROR myproject: Router.use() requires a middleware function but got a undefined
    TypeError: Router.use() requires a middleware function but got a undefined
        at Function.use (/Users/<user>/myproject/node_modules/express/lib/router/index.js:458:13)
        at Object.<anonymous> (/Users/<user>/myproject/backend/routes/api/index.ts:28:8)
        at Module._compile (internal/modules/cjs/loader.js:778:30)
        at Module.m._compile (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:439:23)
        at Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Object.require.extensions.(anonymous function) [as .ts] (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:442:12)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (internal/modules/cjs/helpers.js:25:18)
        at Object.<anonymous> (/Users/<user>/myproject/backend/main.ts:91:17)
        at Module._compile (internal/modules/cjs/loader.js:778:30)
        at Module.m._compile (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:439:23)
        at Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Object.require.extensions.(anonymous function) [as .ts] (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:442:12)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (internal/modules/cjs/helpers.js:25:18)
        at Object.<anonymous> (/Users/<user>/myproject/backend/finalize-offer.ts:18:1)
        at Module._compile (internal/modules/cjs/loader.js:778:30)
        at Module.m._compile (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:439:23)
        at Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Object.require.extensions.(anonymous function) [as .ts] (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:442:12)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (internal/modules/cjs/helpers.js:25:18)
        at Object.<anonymous> (/Users/<user>/myproject/backend/routes/api/offers.ts:15:1)
        at Module._compile (internal/modules/cjs/loader.js:778:30)
        at Module.m._compile (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:439:23)
        at Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Object.require.extensions.(anonymous function) [as .ts] (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:442:12)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (internal/modules/cjs/helpers.js:25:18)
        at Object.<anonymous> (/Users/<user>/myproject/test/unit/i18n-test.ts:8:1)
        at Module._compile (internal/modules/cjs/loader.js:778:30)
        at Module.m._compile (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:439:23)
        at Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Object.require.extensions.(anonymous function) [as .ts] (/Users/<user>/myproject/node_modules/ts-node/src/index.ts:442:12)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (internal/modules/cjs/helpers.js:25:18)
        at /Users/<user>/myproject/node_modules/mocha/lib/mocha.js:231:27
        at Array.forEach (<anonymous>)
        at Mocha.loadFiles (/Users/<user>/myproject/node_modules/mocha/lib/mocha.js:228:14)
        at Mocha.run (/Users/<user>/myproject/node_modules/mocha/lib/mocha.js:536:10)
        at Object.<anonymous> (/Users/<user>/myproject/node_modules/mocha/bin/_mocha:573:18)
        at Module._compile (internal/modules/cjs/loader.js:778:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
        at startup (internal/bootstrap/node.js:283:19)
        at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)

package.json 测试脚本

"test": "npm-run-all --sequential test:unit lint test:api test:browser",
    "lint": "eslint --ext .ts,.tsx,.js . && stylelint \"**/*.less\" \"**/*.css\"",
    "lint-fix": "eslint --ext .ts,.tsx,.js . --fix && stylelint \"**/*.less\" \"**/*.css\" --fix",
    "test:unit": "NODE_ICU_DATA=node_modules/full-icu mocha \"test/unit/**/*test.{tsx,ts}\"",
    "test:api": "NODE_ICU_DATA=node_modules/full-icu mocha test/api/**/*.ts",
    "test:browser": "NODE_ICU_DATA=node_modules/full-icu mocha test/browser/**/*.ts",

这是在backend/routes/api/index.ts（上面提供）全局路由器中间件router.use('/app-offers', isLoggedIn, ensureAccessToken, appOffers)中导入的中间件

后端/路由/api/appOffers.ts

/* imports */

const router = Router()
const upload = multer()

router.post('/offer/:offerId', (req: ApiRequest, res: Response) => {
  ...
})

router.get('/:offerId', (req: ApiRequest, res: Response) => {
  ...
})

router.post('/offer/:offerId/finalize', (req: ApiRequest, res: Response) => {
  ...
})

export const setActiveOfferAsInCrm = (restUrl: string, accessToken: string, logger: Logger) => async (offers: SavedOffer[]): Promise<SavedOffer[]> => {
  ...
}

router.post('/:offerId/activate', (req: ApiRequest, res: Response) => {
  ...
})

router.post('/:offerId/doc-attachment/upload/:type', upload.single('file'), async (req: ApiRequest, res: Response) => {
  ...
})

router.post('/:offerId/doc-attachment/:attachmentId/delete', async (req: ApiRequest, res: Response) => {
  ...
})

router.post('/:offerId/cloning', async (req: ApiRequest, res: Response) => {
  ...
})

router.post('/:offerId/doc-attachment', async (req: ApiRequest, res: Response) => {
  ...
})


enum AttachmentTypes {
  _Docx = 'docx',
  _Jpg = 'jpg',
  _Pdf = 'pdf',
  _Xlsx = 'xlsx',
  _Csv = 'csv'
}
type DocumentType = AttachmentTypes._Docx | AttachmentTypes._Jpg | AttachmentTypes._Pdf | AttachmentTypes._Xlsx
export const documentTypes: DocumentType[] = [AttachmentTypes._Docx, AttachmentTypes._Jpg, AttachmentTypes._Pdf, AttachmentTypes._Xlsx]

export function getDocumentFilename(documentType: DocumentType) {
  switch (documentType) {
    ...
  }
}

function getEmailAttachmentName(t: TranslationFunction, AttachmentTypes: AttachmentTypes, extension: string): string {
  const prefixAndTranslate = (key: string) => t('contractPdf.' + key)

  switch (AttachmentTypes) {
   ...
  }
}

function getEmailAdditionalAttachmentName(t: TranslationFunction, AttachmentTypesNumber: number, originalName: string): string {
  const prefixAndTranslate = (key: string) => t('contractPdf.' + key)
  return prefixAndTranslate('AttachmentTypes') + ' ' + AttachmentTypesNumber + ' - ' + originalName
}

async function loadAndAttachDocument(logger: Logger,
                                     t: TranslationFunction,
                                     businessId: BusinessId,
                                     language: Language,
                                     documentType: DocumentType): Promise<AttachmentFile | undefined> {
  ...
}

export function getDocumentPath(businessId: BusinessId, language: Language, documentType: DocumentType): string {
  return path.join(__dirname, '..', '..', 'assets', 'AttachmentTypeses', businessId, language, getDocumentFilename(documentType))
}

router.post('/:offerId/email', async (req: ApiRequest, res: Response) => {
  ...
})

export default router

【问题讨论】：

当然@jfriend00。我也会发布那些中间件路由器。我会花一些时间来发布它们。非常感谢您的回复。
@jfriend00 我已经发布了一些我在全球中间件路由器中使用过的中间件。所有其他中间件都与 appUsers.ts 时尚相似。
到目前为止，您错过了最重要的线索（我在原始评论中问您的第一个问题）。错误发生在代码的哪一行 router.use() 上？该信息位于错误转储中的堆栈跟踪中（您在此处发布）。然后，您需要检查该行上传递给router.use() 的每个参数，您会发现问题所在。我们不能为您做到这一点。我告诉你如何找到错误。
@jfriend00 我知道哪个中间件是未定义的。但不明白为什么？因为即使这个中间件的编写方式也与其他中间件相同，只是有一些导出常量和导出函数，最后它有export default router
@jfriend00 感谢您的回复。我从 A J A Y 的回复中得到了解决。

标签： node.js socket.io mocha.js chai

【解决方案1】：

尝试一些重构。也许，您可以将多个导出方法从 backend/routes/api/appOffers.ts 转移到各自的 utils 中，并保留导出默认路由器。

很久以前我也遇到过类似的问题，导出默认值与 module.exports 不同。

【讨论】：