NODE.JS(TYPESCRIPT) Property 'req' does not exist on type 'NodeModule' - node.js

Question

I am having issues using this.status and this.req in my subfile
I initialize the route index like this
router.use(response);
my index file is below
import {Request,Response,NextFunction} from 'express'
module.exports = function(req:Request, res:Response, next:NextFunction){
const responseTypes = {
unprocessable: require('./unprocessable')
};
res = {...res, ...responseTypes};
next();
};
here is my unprocessable.ts file
import log from '../logger'
import queue from '../queue'
module.exports = function (data, message) {
log.warn('Sending unprocessable entity response: ', data, message || 'unprocessable entity');
const req = this.req;
const res = this;
// Dump it in the queue
const response = { response: { status: 'error', data: data, message: message ? message : 'unprocessable entity' } };
response.requestId = req.requestId;
queue.add('logResponse', response);
if (data !== undefined && data !== null) {
if (Object.keys(data).length === 0 && JSON.stringify(data) === JSON.stringify({})) {
data = data.toString();
}
}
if (data) {
this.status(422).json({ status: 'error', data: data, message: message ? message : 'unprocessable entity' });
} else {
this.status(422).json({ status: 'error', message: message ? message : 'unprocessable entity' });
}
};
It complains about the following in the unprocessable.ts file
Property 'status' does not exist on type 'NodeModule' if I use this.status
Property 'req' does not exist on type 'NodeModule' if I use this.req
I have no idea how to solve it as I am new to typescript

Answer 1

Typescript does for the most part not know what you refer to when you are using the this keyword.
You can however tell typescript what you mean by this, e.g:
function someFunction(this: object) {
// do something with this
}
In your case, this refers to an object that extends Response from express so what you could do is:
const { Response } = require('express');
interface IModifiedResponse extends Response {
// define your properties here
unprocessable: (data: object, message: string) => void
}
function unprocessable(this: IModifiedResponse, data: object, message: string) {
// use this as in your function
}
However I do not know what this.req refers to as Response does not have a req property. See ExpressJS docs
Hope this answers helps :).