anti-ad.js

module.exports = (client) => {
  const isInvite = async (guild, code) => {
    return await new Promise((resolve) => {
      guild.fetchInvites().then((invites) => {
        for (const invite of invites) {
          if (code === invite[0]) {
            resolve(true)
            return
          }
        }

        resolve(false)
      })
    })
  }

  client.on('message', async (message) => {
    const { guild, member, content } = message

    // discord.gg/23RAN4

    const code = content.split('discord.gg/')[1]
    console.log('CODE:', code)

    if (content.includes('discord.gg/')) {
      const isOurInvite = await isInvite(guild, code)
      if (!isOurInvite) {
        // we know that they are advertising an outside discord server
      }
    }
  })
}