JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://github.com/downloads/SteveSanderson/knockout/knockout-2.0.0.debug.js"></script>
<button data-bind="click: testMethod">Click me</button>

JavaScript

function TestViewModel(){
    var self = this;
    
    self.testMethod = function(){
        alert('hi');
    };
}

ko.applyBindings(new TestViewModel());