Add Property to Express Request Object

Issue

I'm trying to add a property "forwardingUrl" to the Express request object.

I tried declaration merging by creating a file ./typing.d.ts:

declare namespace Express {
  export interface Request {
    forwardingUrl: string;
  }
}

in the editor I can use the property and access it but when I compile I get the following error:

Property 'forwardingUrl' does not exist on type 'Request<ParamsDictionary>'.

What am I missing?

EDIT

The code where I get the error:

import { Middleware, Request } from '@tsed/common';
import { Request as ExpressRequest } from 'express';
@Middleware()
export class Wso2ForwardingUrlParser {
    async use(@Request() request: ExpressRequest) {
        if (request.header('X_FORWARDED_HOST') && request.header('X_FORWARDED_PREFIX')) {
            request.forwardingUrl = `https://${request.header('X_FORWARDED_HOST')}${request.header('X_FORWARDED_PREFIX')}`;
        }   else {
            request.forwardingUrl = '';
        }
    }
}

Solution

Add new model that extends Request

import {Request} from "@tsed/common";

export interface RequestModel extends Request {
    forwardingUrl: string
}

and then use it in method

import { Middleware, Request } from '@tsed/common';
import { Request as ExpressRequest } from 'express';
@Middleware()
export class Wso2ForwardingUrlParser {
    async use(@Request() request: RequestModel) {
        if (request.header('X_FORWARDED_HOST') && request.header('X_FORWARDED_PREFIX')) {
            request.forwardingUrl = `https://${request.header('X_FORWARDED_HOST')}${request.header('X_FORWARDED_PREFIX')}`;
        }   else {
            request.forwardingUrl = '';
        }
    }
}

Answered By - IARKI