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();

        }

        async _getMute() {
            const { expirations } = this.client.moderationManager;
            const filtered = expirations.filter((e) => e.infraction.type === 'MUTE'
                && e.infraction.target === this.id);

            if(filtered.length > 0) return filtered.first();
            const result = await this.client.transactionHandler.send({ //Checking for permanent mutes, won't show up in expirations.
                provider: 'mongodb',
                request: {
                    collection: 'infractions',
                    type: 'findOne',
                    query: { duration: 0, type: 'MUTE', target: this.id },
                    sort: { $natural: -1 } //latest mute
                }
            }).catch((e) => {}); //eslint-disable-line
            if(result) return result; 
            return null;

        }

        get admin() {
            return this.user.developer || this.hasPermission('ADMINISTRATOR') || this.hasPermission('MANAGE_GUILD');
        }

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


    }

    return ExtendedGuildMember;

});

module.exports = GuildMember;