For this piece of code, I aim for the author of the message that sent the ban command to be checked for whether they have the permissions necessary to ban the member, instead of instantly being allowed to, however I am unsure of what the const mod should be equivalent to to do so. Any help would be appreciated, thanks.

module.exports = {
    name: 'ban',
    description: "This command ban a member!",
    execute(message, args) {
        const target = message.mentions.users.first();
        const mod = message.author();
        
        if (mod.hasPermission('BAN_MEMBERS')) {
            if (target) {
                const memberTarget = message.guild.members.cache.get(target.id);
                memberTarget.ban();
                message.channel.send("User has been banned");
                
            }
            
            
        } else if (mod.hasPermission(!'BAN_MEMBERS')) {
            message.channel.send(`You couldn't ban that member either because they don't exist or because you dont have the required roles!`);
        }
    }
}