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;