addRole is not a function

Question

I am creating a Discord Bot. I am trying create a Mute command, but I always get the same error.

What went wrong?

Background information:

• Discord.js version: 12.0.0-dev

• Klasa with version 0.5.0-dev is used

Code:

const { Command } = require('klasa');
const { MessageEmbed } = require('discord.js');

module.exports = class extends Command {

    constructor(...args) {
        super(...args, { description: 'Mute an user.' })
    }

    async run(msg, args) {
        if(!msg.member.hasPermission("MANAGE_MEMBERS")) return msg.channel.send("You can't use this command.");

        let MuteUser = msg.guild.member(msg.mentions.users.first() || msg.guild.members.get(args[0]))
        if(!MuteUser) return msg.channel.send("Can't find user!");

        let MuteReason = msg.content.split(" ").slice(2).join(" ");

        let MuteRole = msg.guild.roles.find(r => r.name === "Spammer");
        if(!MuteRole) return msg.channel.send("Can't find the Spammer role!");

        let MuteChannel = msg.guild.channels.find(guild => guild.name === 'bot-logs');
        if(!MuteChannel) return msg.channel.send("Can't find the #bot-logs channel.");

        if(MuteUser.roles.has(MuteRole)) return msg.channel.send("That user is already muted!.");

        MuteUser.addRole(MuteRole.id);

        return MuteChannel.send(new MessageEmbed()
            .setAuthor("Mute"|| 'Unknown', "http://wolfdevelopment.cf/BotSymbols/info.png")
            .setColor("#ff0000")
            .addField("Muted User", `${MuteUser}`)
            .addField("Muted By", `<@${msg.author.id}>`)
            .addField("Muted In", `${msg.channel}`)
            .addField("Time", `${msg.createdAt}`)
            .addField("Reason", `${MuteReason}`));
    }
}

I have checked that MuteUser is a person in this line:

    if(!MuteUser) return msg.channel.send("Can't find user!");

So it must be a person. Why doesn't it have an addRole function?

Answer 1

I decided to look at this from another viewpoint and searched the Discord.js documentation for some more information. Sure enough, something is found:

I assume your call to msg.guild.member would result in a GuildMember because that is what the name implies.

Stable (Presumably 11.x): https://discord.js.org/#/docs/main/stable/class/GuildMember

Note that addRole is the first item below Methods.

Now, switching to master (aka Development branch - where you got 12.0.0-dev from)... https://discord.js.org/#/docs/main/master/class/GuildMember

addRole isn't there anymore.

Clicking the type of roles... https://discord.js.org/#/docs/main/master/class/GuildMemberRoleStore add is the first method.

You can probably replace MuteUser.addRole with MuteUser.roles.add.

Note: This does not invalidate any of my words in the comments because you didn't provide enough information in the question itself on what type MuteUser is when the error was thrown.

Note 2: This took one Google search only. How much work did you even put into research?