galactic-bot/structure/extensions/GuildMember.js

const { Structures } = require('discord.js');

const GuildMember = Structures.extend('GuildMember', (GuildMember) => {

    class ExtendedGuildMember extends GuildMember {

        constructor(...args) {

            super(...args);

            this._cached = Date.now();

        }

        get timeSinceCached() {
            return Date.now()-this._cached;
        }


    }

    return ExtendedGuildMember;

});

module.exports = GuildMember;