import db from '../../db/mongodb'; const collection = db.collection('users'); collection.createIndex('username'); collection.createIndex('token'); export default collection; export function validateUsername(username: string): boolean { return /^[a-zA-Z0-9\-]{3,20}$/.test(username); } export function isValidBirthday(birthday: string): boolean { return /^([0-9]{4})\-([0-9]{2})-([0-9]{2})$/.test(birthday); }