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(() => {
  class ButtonElement {
    constructor(selector) {
      this.selector = selector;
    }

    get element() {
      return document.querySelector(this.selector);
    }

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(function() {
  class MarkdownSyntax {
    static getFootNote({ identifier, content }) {
      return `${identifier}: ${content}`;
    }

    static getLink({ title, url }) {
      return `[${title}](${url})`;
    }
  }

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(() => {
  const videoDescriptionSelector = '#description-inline-expander > yt-attributed-string';
  const $videoDescription = document.querySelector(videoDescriptionSelector);
  const [songTitle, artist] = $videoDescription?.textContent
    .split('\n\n')[1]
    .split(' · ');
  const fullArtist = document.querySelector('#owner #upload-info a').textContent;
  const result = `${fullArtist} - ${songTitle}`;
  copy(result);
  

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(() => {
  const redirectMatchers = [
    {
      matcher: () => location.host.includes('slideshare.net'),
      action: redirectSlideShare
    },
    {
      matcher: () => location.host.includes('facebook'),
      action: redirectFacebook
    },

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(() => {
  if (location.host === 'm.facebook.com') {
    location.href = 'https://www.facebook.com' + location.pathname + location.search;
    return;
  }
  if (location.host === 'www.facebook.com') {
    location.href = 'https://m.facebook.com' + location.pathname + location.search;
    return;
  }
})();

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(function() {
  class Sidebar {
    constructor(element) {
      this.element = element;
    }
  
    get display() {
      return this.element.style.display;
    }
  

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(() => {
  const vedioId = location.pathname.split('/').at(-1);
  location.href = `${location.origin}/watch?v=${vedioId}`;
})();

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(function() {
  const sidebar = document.querySelector('#sidebar');
  sidebar.style.display = !sidebar.style.display ? 'none' : null;
})()

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(() => {
  const title = document.querySelector('[data-testid=context-item-info-title]').textContent;
  const [...artists] = document.querySelectorAll('[data-testid=context-item-info-artist]');
  const artistList = artists.map(artist => artist.textContent).join(' & ');

  const textArea = document.createElement('textarea');
  textArea.value = `${artistList} - ${title}`;
  document.body.appendChild(textArea);
  textArea.select();
  document.execCommand('Copy');

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(() => {
  if (location.hostname === 'github.com') {
    const [_, username, repo] = location.pathname.split('/');
    location.href = `https://${username}.github.io/${repo}`;
    return;
  }
  if (location.hostname.includes('github.io')) {
    const username = location.host.split('.')[0];
    const repo = location.pathname.split('/')[1];
    location.href = `https://github.com/${username}/${repo}`;