JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" class="white-space-is-dead" value="doron" />
<input type="text" class="white-space-is-dead" value="aaaa" />
<input type="text" class="white-space-is-dead" value="dor  on" />

JavaScript

$('.white-space-is-dead').change(function() {
    this.replace(/\s/g, '');
});