JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.0/knockout-debug.js"></script>
<script src=" https://cdnjs.cloudflare.com/ajax/libs/knockout-validation/2.0.3/knockout.validation.js"></script>

JavaScript

var pure = ko.pureComputed(function () {
	alert("computed");
}).extend({
	validatable: true
});