Aggregate videos from multiple channels in the last hours

fetch-videos.js

const fetchVideos = (channels, apiKey, lastHours) => {
  return Promise.all(
    channels.map(channel => {
      const url = `https://www.googleapis.com/youtube/v3/search?key=${apiKey}&channelId=${channel}&part=snippet,id&order=date&maxResults=20`;

      return fetch(url)
        .then(response => response.json())
        .then(json => {
          return json.items
            .filter(item => item.id.kind === 'youtube#video')
            .filter(item => {
              const now = new Date();
              const then = new Date(item.snippet.publishedAt);
              const timeDiffInHours = parseInt((now - then) / 1000) / 60 / 60;
              return timeDiffInHours < lastHours;
            })
            .map(item => {
              return {
                id: item.id.videoId,
                title: item.snippet.title,
                description: item.snippet.description,
                date: item.snippet.publishedAt,
                image: item.snippet.thumbnails.high.url,
              };
            });
        });
    }),
  ).then(videos => {
    return videos.flat().sort((a, b) => {
      return new Date(b.date) - new Date(a.date);
    });
  });
};