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npm install rss-to-json --save
npm install @types/node --save-dev

(Provider)

getJsonFromRSS(): Promise<any> {
    return new Promise(resolve => {
      var Feed = require('rss-to-json');
      let _URL = "http://rssurl.com/";
      
      let listRSS: any[] = [];

      Feed.load(_URL, function (err, result) {
        for (let i = 0; i < result.items.length; i++) {
          listRSS.push(JSON.parse(JSON.stringify(result.items[i])));
        }

        resolve(listRSS);
      });
    });
  }
}

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(Client)

rssList: {
    title: string;
    link: string;
    description: string;
    pubDate: Date;
}[] = [];

loadRssData() {
    getJsonFromRSS().then(dataList => {
      let data = JSON.parse(JSON.stringify(dataList));
      
      for (var i = 0; i < data.length; i++) {
        let itemRSS: {
          title: string;
          link: string;
          description: string;
          pubDate: Date;
        } = { title: data[i].title, link: data[i].link, description: data[i].description, pubDate: new Date(data[i].created) };
        this.rssList.push(itemRSS);
      }
      
      this.rssList.sort((a, b) => new Date(b.pubDate).getTime() - new Date(a.pubDate).getTime());
    });
}