JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">

JavaScript

function hasEffect(effect) {
    return $.effects && $.effects[effect];
}

if(hasEffect('blind')) {
    alert('found!');
} else {
    alert('lost!, errr missing!');
}