How to check if mentioned user's roles are higher than message author's roles?

I'm making a mute command, and I want to check if the role of the author is higher than the role of the mentioned user.

This is what I tried

    let mentionedrole = message.mentions.roles.first();
    let authorrole = message.author.roles

    if(mentionedrole.position > authorrole.position) {
        message.channel.send(`You don't have access to mute this user. ${message.author}`)
        return
    }

The error that keeps appearing is

TypeError: Cannot read properties of undefined (reading 'position')

Message.author doesn't have role property. This is because author refers to the user itself, but Message.member refers to the user as a guild member.

Also, you should use Messsge.member.roles.highest to get the highest position of role.

The code would be:

let mentionedRole = message.mentions.roles.first();
let authorRole = message.member.roles.highest;

if (mentionedRole.position > authorRole.position) {
  message.channel.send(`You don't have access to mute this user. ${message.author}`)
  return
}