index.js

const muteStorage = new Keyv(MONGODB_URI, { namespace: `${env}mute` })

const unmute = async () => {
  client.guilds.cache.forEach((g) => {
    const muted = g.members.cache.filter((m) => {
      const roleNames = Array.from(
        m.roles.cache.mapValues((r) => r.name).values(),
      )
      return roleNames.includes(ROLES.MUTED)
    })
    if (muted.size) {
      const guildRoles = g.roles.cache
      muted.forEach(async (m) => {
        const muteRecord = await muteStorage.get(m.id)
        if (!muteRecord) {
          m.roles.remove(findRoleByName(guildRoles, ROLES.MUTED))
        }
      })
    }
    console.log(`${g.name}: ${muted.size} muted`)
  })
}

client.once('ready', async () => {
  setInterval(unmute, 1000 * 10)
})

mute.js

if (command === COMMANDS.UNMUTE) {
  await muteStorage.delete(mutee.id)
  mutee.roles.remove(mutedRole)
} else {
  const mention = `<@!${mutee.id}>`
  const msg = request.substr(mention.length).trim()
  duration = msg.substr(0, msg.indexOf(' '))
  if (!duration.length) {
    return message.channel.send('You must provide a duration and reason')
  }
  const unit = duration.substr(-1)
  const num = parseInt(duration.substr(0, duration.indexOf(unit)))
  if (!['m', 'h', 'd'].includes(unit)) {
    return message.channel.send('Duration must end in "m", "h", or "d"')
  }
  if (isNaN(num)) {
    return message.channel.send('Could not parse number from duration')
  }
  reason = msg.substr(duration.length + 1)
  if (!reason.length) {
    return message.channel.send('You must provide a reason')
  }
  let ms
  switch (unit) {
    case 'm':
      ms = 1e3 * 60
      break
    case 'h':
      ms = 1e3 * 60 * 60
      break
    case 'd':
      ms = 1e3 * 60 * 60 * 24
      break
  }
  await muteStorage.set(mutee.id, reason, ms * num)
  mutee.roles.add(mutedRole)
}