如何在nestJS后端使用条件app.use()？

Question

这就是我尝试将

helmet

添加到我的 NestJS 应用程序中的方式。另外我需要添加

graphqlUploadExpress

如何正确使用

usesUpload

条件来使用

helm

或

helm + upload

？

import { NestFactory } from '@nestjs/core'
import graphqlUploadExpress from 'graphql-upload/graphqlUploadExpress.js'
import helmet from 'helmet'

const upload = graphqlUploadExpress()

export const main = async (
  AppModule: unknown,
  usesUpload = false
) => {
  const app = await NestFactory.create(AppModule, options)
  app.use(usesUpload ? helm : helm, upload) // <-- I think, this is not correct
  await app.listen(3000)
}

Answer 1

我认为你的三元陈述是错误的。语法在这里： https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_operator

这是我个人会写的：

import { NestFactory } from '@nestjs/core'
import graphqlUploadExpress from 'graphql-upload/graphqlUploadExpress.js'
import helmet from 'helmet'

const upload = graphqlUploadExpress()

export const main = async (
  AppModule: unknown,
  usesUpload = false
) => {
  const app = await NestFactory.create(AppModule, options)
  usesUpload && app.use(helm, upload)
  await app.listen(3000)
}

我使用逻辑 AND 运算符而不是三元运算符

&&

，如果

usesUpload

参数为

true

，它将有条件地执行

逻辑与文档：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND