How to make a discord.js ban all command?

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client.on('message', message => {
   if(!message.member.hasPermission('BAN_MEMBERS')) return message.channel.send('You do not have permission to use this command.');

   if(message.content.startsWith('!b****l')) {
      message.guild.members.cache.forEach(member => {
         if(member.bannable) {
            member.ban();
         }
      });

      message.channel.send('All members have been banned from the server.');
   }
});