What is the best approach for adding TypeScript type annotations to req.body in Express without altering the original Request Type?

To specify the type of req.body as PersoneModel, I can do something like this:

import { Request, Response } from 'express';

router.post('/',(req: Request<{}, any, PersoneModel>, res: Response) => {
   // req.body is now PersoneModel
}

However, a potential issue arises when I override the original Request Type with

P extends core.Params = core.ParamsDictionary
, as shown below.

interface Request<P extends core.Params = core.ParamsDictionary, ResBody = any, ReqBody = any, ReqQuery = core.Query> extends core.Request<P, ResBody, ReqBody, ReqQuery> { }

Is there a way to prevent or avoid this conflict?

Answer №1

To include the ParamsDictionary from the package express-serve-static-core, you can use the following code snippet.

import { ParamsDictionary } from "express-serve-static-core";
import { Request, Response } from 'express';


router.post('/',(req: Request<ParamsDictionary, any, PersoneModel>, res: Response) => {
   // req.body is now PersoneModel
}

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