JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" />
<button type="button" disabled>
BUTTON
</button>

JavaScript

$(document).ready(function() {
	$("input").keyup(function() {
  	if (!$(this).val()) {
    	$("button").prop("disabled", true);
    } else {
    	$("button").prop("disabled", false);
    }
  });
})