const Joi = require("joi")
const schema = Joi.object().keys({
password: Joi.string().regex(/^[a-zA-Z0-9]{3,30}$/).required(),
email: Joi.string().email({ minDomainAtoms: 2 }).required(),
username: Joi.string().alphanum().min(3).max(30).required(),
});
const {error} = Joi.validate({username: ""}, Joi.object().keys({ username: Joi.reach(schema, 'username') }))