Type error on "files" key when extending "Request" type with @types/express 5.0

[Bilboramix]

Hey, i've got this interface here :

import formidable from "formidable";
import type { Request } from "express";

export interface IRequestWithFiles extends Request {
  files: Record<string, formidable.File>;
}

With the types "@types/express": "^4.17.21" everything is fine
But with "@types/express": "^5.0.0" typescript throws this error :

Conversion of type 'Request<ParamsDictionary, any, any, ParsedQs, Record<string, any>>' to type 'IRequestWithFormData' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
  Types of property 'files' are incompatible.
    Type 'Files | undefined' is not comparable to type 'Record<string, File>'.
      Type 'Files' is not comparable to type 'Record<string, File>'.
        'string' index signatures are incompatible.
          Type 'File[] | undefined' is not comparable to type 'File'.
            Type 'File[]' is missing the following properties from type 'File': size, filepath, originalFilename, newFilename, and 3 more.

As a workaround i just renamed the "files" key of my interface.
But i cannot find in the type definition file anything related to the "files" key so i'm wondering why and how this key is typed.
Is there anything coming in future releases that involve that key ?

[Bilboramix]

Woops my bad this is because i've got express-formidable installed that rely on an old version of formidable :

// index.d.ts of express-formidable
import * as express from "express";
import { EventNames, Fields, Files } from "formidable";

// Extend the express request object with attached formidable files and fields
declare global {
    namespace Express {
        interface Request {
            fields?: Fields;
            files?: Files;
        }
    }
}

My first repo that works with 4.17.21 types does not have express-formidable...
Uninstall it fixed the problem.