如何在 typescript express 中设置 cors()

Question

在我的一个项目中，这很有效：

import cors from "cors";

server.use(cors());

但目前我的新项目中有这个可爱的打字稿警告消息：

  No overload matches this call.
  The last overload gave the following error.
    Argument of type '(req: Request<never, never, never, never>, res: { statusCode?: number | undefined; setHeader(key: string, value: string): any; end(): any; }, next: (err?: any) => any) => void' is not assignable to parameter of type 'RequestHandlerParams<ParamsDictionary, any, any, ParsedQs>'.
      Type '(req: Request<never, never, never, never>, res: { statusCode?: number | undefined; setHeader(key: string, value: string): any; end(): any; }, next: (err?: any) => any) => void' is not assignable to type 'RequestHandler<ParamsDictionary, any, any, ParsedQs>'.
        Types of parameters 'req' and 'req' are incompatible.
          Type 'Request<ParamsDictionary, any, any, ParsedQs>' is not assignable to type 'Request<never, never, never, never>'.
            Type 'ParamsDictionary' is not assignable to type 'never'.ts(2769)

然后我尝试设置自定义 cors 中间件并使用它：

import { NextFunction ,Request,Response} from 'express';

export const Cors=(req:Request, res:Response, next:NextFunction) => {
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.setHeader(
      "Access-Control-Allow-Methods",
      "OPTIONS, GET, POST, PUT, PATCH, DELETE"
    );
    res.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization");
    if (req.method === "OPTIONS") {
      return res.sendStatus(200);
    }
    next();
  };

   server.use(Cors());

这次我又犯了一个可爱的错误：

没有重载匹配这个调用。 最后一个重载给出了以下错误。 '响应 | 类型的参数undefined' 不可分配给“RequestHandlerParams”类型的参数。 类型 'undefined' 不可分配给类型 'RequestHandlerParams'

Answer 1

我找到了这个解决方案：

使用：

...
  "express": "^4.17.1",
  "@types/express": "^4.17.9",
...

将“.use(cors())”替换为

.use((req, resp, next) => {
    next()
  }, cors({ maxAge: 84600 }))

来源：https://github.com/DefinitelyTyped/DefinitelyTyped/issues/43909#issuecomment-743156647

Answer 2

来自express official documentation：

对于所有 cors 请求，请执行以下操作

var express = require('express')
var cors = require('cors')
var app = express()

app.use(cors())

app.get('/products/:id', function (req, res, next) {
  res.json({msg: 'This is CORS-enabled for all origins!'})
})

app.listen(80, function () {
  console.log('CORS-enabled web server listening on port 80')
})

或者，如果您想添加单个路由配置：

var express = require('express')
var cors = require('cors')
var app = express()

app.get('/products/:id', cors(), function (req, res, next) {
  res.json({msg: 'This is CORS-enabled for a Single Route'})
})

app.listen(80, function () {
  console.log('CORS-enabled web server listening on port 80')
})

更具体的配置可以查看官方文档，非常简单直接