text: import cheerio from 'cheerio'
  
  export default (content) => {
    if (!content) return []
    const $ = cheerio.load(content)
    const userIds = $('a.mention[data-mention-id]')
      .map((_, el) => {
        return $(el).attr('data-mention-id')
      })
      .get()
    return userIds
      .map((id) => id.trim())
      .filter((id) => !!id)
      .filter((id, index, allIds) => allIds.indexOf(id) === index)
  }
  