JSFiddle - React, Tailwind, and code Playground

HTML

<textarea class="growingTextarea" rows="2" cols="20">
</textarea>

JavaScript

$(function () {
    $(".growingTextarea").bind("keyup", function () {
        var textarea = $(this);
        var currentRows = parseInt(textarea.attr('rows'));
        
        var isScrollable = textarea.scrollTop();        
        if(isScrollable) {
            textarea.attr('rows', currentRows+1);
        }
    });
});