foo.ts

enum EmbedTypes {
  CLIP = 'clip',
  VIDEOS = 'videos',
}
const twitchRegex: RegExp = /[^/]*$/;

const twitchEmbedId = (url: string): string => {
  const value = twitchRegex.exec(url);
  return value ? value[0] : '';
};

const buildTwitchEmbedUrl = (url: string): string => {
  if (!url) return '';
  if (url.includes(`/${EmbedTypes.VIDEOS}/`)) // TU DA SIĘ LEPIEJ
    return `https://player.twitch.tv/?video=${twitchEmbedId(
      url,
    )}&parent=localhost&autoplay=true`;
  if (url.includes(`/${EmbedTypes.CLIP}/`)) // TU TAK SAMO
    return `https://clips.twitch.tv/embed?clip=${twitchEmbedId(
      url,
    )}&parent=localhost&autoplay=true`;
  return `https://player.twitch.tv/?channel=${twitchEmbedId(
    url,
  )}&parent=localhost`;
};

export default buildTwitchEmbedUrl;

// URL's
// 1. https://www.twitch.tv/mrs_honey  (channel - live_stream)
// ZAMIANA - https://player.twitch.tv/?channel=mrs_honey&parent=www.example.com
// 2. https://www.twitch.tv/videos/886723557 (videos)
// ZAMIANA - https://player.twitch.tv/?video=886053125&parent=www.example.com
// 3. https://www.twitch.tv/forsen/clip/EphemeralAbrasiveCamelTebowing (clip)
// ZMIANA - https://clips.twitch.tv/embed?clip=AmorphousVivaciousPancakeTooSpicy&parent=www.example.com

// FLOW
// twitchEmbedId - will return a unique id/username
// buildTwitchEmbedUrl - will create an iframe src url based on twitchEmbedId