Typescript version of https://github.com/wix/commons-validator-js/blob/master/package.json https://www.npmjs.com/package/commons-validator-js Run npm install commons-validator-ts

Example import {EmailValidator} from "./emailValidator.service" let validator = new EmailValidator(); if(validator.isValid(c.value)) { console.log('validated true') return null } else{ console.log('validated false') return { validateEmail: { valid: false } } }