current.js

import Twitter from 'twitter';

const client = new Twitter({
  consumer_key: process.env.TWITTER_CONSUMER_KEY,
  consumer_secret: process.env.TWITTER_CONSUMER_SECRET,
  access_token_key: process.env.TWITTER_ACCESS_TOKEN_KEY,
  access_token_secret: process.env.TWITTER_ACCESS_TOKEN_SECRET
});

let getFaves = function () {
  client.get('favorites/list.json?include_entities=true&count=20', function (error, tweets, response) {
    if (error) throw error;
    return tweets.reduce((memo, tweet) => {
      const urls = tweet.entities.urls;
      urls && urls.forEach(url => memo.push(url.expanded_url));
      return memo;
    }, []);
  });
};

console.log(getFaves());