Request provider in Nestjs, I cannot import REQUEST object

Question

I am trying to implement a functionality with some request providers, I am following this example in the doc https://docs.nestjs.com/fundamentals/injection-scopes#request-provider

import { Injectable, Scope, Inject } from '@nestjs/common';
import { REQUEST } from '@nestjs/core';
import { Request } from 'express';

@Injectable({ scope: Scope.REQUEST })
export class CatsService {
  constructor(@Inject(REQUEST) private readonly request: Request) {}
}

However, I cannot import the REQUEST object. It seems like it does not exist in the core of library

Does anyone know where is it?

These are my dependencies

"dependencies": {
    "@nestjs/common": "^6.0.5",
    "@nestjs/core": "^6.0.5",

Thanks