index.js

const dotenv = require('dotenv');

const clientOptionsDefaults = {
    token: undefined,
    logChannel: undefined
};

class missingLogChannelError extends Error {
    constructor() {
        super('Log Channel not found.');
        this.name = 'missingLogChannel';
    };
};

const colors = {
    green: 0x84ed47
}

module.exports = {
    Handler: class {
        constructor(Discord) {
            this.Discord = Discord;
            const logChannelReadyEmbed = new this.Discord.RichEmbed({
                title: 'Bot Ready',
                color: colors.green
            })
            // I have a feeling something here doesent send the right things to Client
            class Client extends Discord.Client {
                constructor(options) {
                    super();
                    this.options = clientOptionsDefaults;
                    this.options = Object.assign(this.options, options);
                    // removes options from the arguments (IDK if it will work)
                    if (options.token) {
                        this.on('ready', () => {
                            console.log(`${this.username} is ready`);
                            // checks if log channel is a option
                            if (options.logChannel) {
                                // gets the log channel
                                const logChannel = this.channels.get(options.logChannel);
                                // checks if its a valid log channel
                                if (logChannel) {
                                    logChannelReadyEmbed.setDescription(`${this.user.username} is ready.`);
                                } else {
                                    throw new missingLogChannelError();
                                };
                            }
                        });
                        this.login(this.options.token);
                    };
                };
            }
            this.Discord.Client = Client;
        };
    }
};