'req' 已声明，但它的值从不。 参数“req”隐式具有“任何”类型

Question

This my code

const http = require('http');
const port = 8080;
const server = http.createServer((req, res) => {
  res.end('Hello, world.');
});
server.listen(port);

i get an error

'req' is declared but its value is never. Parameter 'req' implicitly has an 'any' type

I know three ways to fix a mistake.1 // @ts-ignore , 2 (req:any, res:any) , 3 "noImplicitAny": false . I do not like all these ways.If a different approach to solve this problem?.

Answer 1

Set noUnusedLocals to false in your tsconfig to ignore unused variable errors for your whole code base. See compiler options . Otherwise, use one of the other approaches you mentioned.

Answer 2

https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-0.html

Parameters declaration with names starting with _ are exempt from the unused parameter checking.

So to address the first error, use something like:

const server = http.createServer((_req, res) => {

or even

const server = http.createServer((_, res) => {

To address the second error, you will either have to explicitly annotate req as any or import the IncomingMessage type from https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/node/http.d.ts .