A guide on integrating third-party npm modules/packages into an Angular 8 application

As someone who is new to Angular and TypeScript, I am finding it challenging to add a 3rd party module or package to my Angular app. After spending hours searching online, I have yet to come across a simple guide for this process.

The specific problem I am facing is related to creating an RSS reader. My research led me to believe that I can achieve this by installing the following npm package:

https://www.npmjs.com/package/rss-to-json

Despite trying various approaches, I have been unsuccessful so far. Below, I have included the latest code from my service:

http-requests.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { HttpHeaders } from '@angular/common/http';
import { Feed } from 'rss-to-json';

@Injectable({
  providedIn: 'root'
})

export class HttpRequestsService {

  constructor(private http: HttpClient) { }

  doDummyRequest() {
    return Feed.load('https://learnstartup.net/feed/', function(err, rss){
      console.log(rss);
    });
  }

  displayDummyRequest() {
    this.doDummyRequest().subscribe((data: any) => {
      console.log(12346);
      console.log(data);
    });
  }
}

However, this code is generating an error:

RssFeedComponent.ngfactory.js? [sm]:1 ERROR TypeError: Cannot read property 'load' of undefined
    at HttpRequestsService.doDummyRequest (http-requests.service.ts:15)
    at RssFeedComponent.onDummyButtonClick (rss-feed.component.ts:18)
    at Object.eval [as handleEvent] (RssFeedComponent.html:5)
    at handleEvent (core.js:43993)
    at callWithDebugContext (core.js:45632)
    at Object.debugHandleEvent [as handleEvent] (core.js:45247)
    at dispatchEvent (core.js:29804)
    at core.js:42925
    at HTMLButtonElement.<anonymous> (platform-browser.js:2668)
    at ZoneDelegate.invokeTask (zone-evergreen.js:391)

Additionally, my IDE (Visual Studio Code) is showing a hint:

Could not find a declaration file for module 'rss-to-json'. '/home/h8machine/App/news-agg/node_modules/rss-to-json/dist/index.js' implicitly has an 'any' type.
  Try `npm install @types/rss-to-json` if it exists or add a new declaration (.d.ts) file containing `declare module 'rss-to-json';`ts(7016)

Any assistance would be greatly appreciated.

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