"No overload matches this call" using cookieParser with Express 5 and Typescript

[thardy]

Environment information

Version:

"dependencies": {
 "cookie-parser": "^1.4.7",
 "express": "^5.1.0",
}

Platform: Windows 11

Node.js version: v20.15.1

Bug

No overload matches this call. The last overload gave the following error. Argument of type 'RequestHandler<ParamsDictionary, any, any, ParsedQs, Record<string, any>>' is not assignable to parameter of type 'PathParams'.ts(2769) index.d.ts(157, 5): The last overload is declared here.

What steps will reproduce the bug?

Write the following code...

import cookieParser from 'cookie-parser';
import express, {Application} from 'express';

const app: Application = express();
app.use(cookieParser());

The error is caused by Express 5 being more strict with Typescript and wanting return void. You can no longer return anything from your middleware. I've had to replace all code like

return res.status(200);

with

res.status(200);
return // or just get rid of return completely

The only workaround I've found is the following...

app.use(cookieParser() as any);

which is a last resort when using Typescript, as it completely turns off all Typescript type checking.

You need to update this package to work properly with Express 5.