npm i extravalidation

yarn add extravalidation

import { validate, Values, Rules } from "xtravalidation";

let rules: Rules = {
    firstname: ["required", "min:3", "max:50"],
    lastname: ["required", "min:3", "max:50"],
    email: ["required", "email"],
    password: ["required", "min:8", "confirmed"],
};

let values: Values = {
    firstname: "c", // less than 3
    lastname: "camado...", // greater than 50 characters
    email: "example@.com", // not a valid email
    password: "passwo", // less than 8
    password_confirmation: "password", // different than the actual password
};

let [satisfied, errors] = validate(rules, values);

/*
satisfied => false
errors => {
    firstname: [
      'The field with the key value of firstname should be greater than or equal 3.'
    ],
    email: [
      'The field with the key value of email should be a valid Email Address.'
    ],
    password: [
      'The field with the key value of password should be greater than or equal 8.'
    ]
}
*/