text: import videojs from 'video.js';
  
  // Concrete classes
  const VideoJsMenuItemClass = videojs.getComponent('MenuItem');
  
  /**
   * Extend vjs menu item class.
   */
  export default class ConcreteMenuItemHlsJs extends VideoJsMenuItemClass {
  
      /**
       * Menu item constructor.
       *
       * @param {Player} player - vjs player
       * @param {Object} item - Item object
       * @param {ConcreteButton} qualityButton - The containing button.
       * @param {HlsJSQualitySelectorPlugin} plugin - This plugin instance.
       */
    constructor(player, item, qualityButton, plugin) {
      super(player, {
        label: item.label,
        selectable: true,
        selected: item.selected || false
      });
      this.item = item;
      this.qualityButton = qualityButton;
      this.plugin = plugin;
    }
  
      /**
       * Click event for menu item.
       */
    handleClick() {
  
          // Reset other menu items selected status.
      for (let i = 0; i < this.qualityButton.items.length; ++i) {
        this.qualityButton.items[i].selected(false);
      }
  
          // Set this menu item to selected, and set quality.
      this.plugin.setQuality(this.item.value);
      this.selected(true);
  
    }
  }
  