JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="comment" rows="5" cols="40"></textarea>

JavaScript

$(document).ready(function() {

    $('#comment').keypress(function(event) {

        if (event.keyCode == 13) {
            event.preventDefault();
        }
    });
    
    $('#comment').keyup(function() {
        var txt = $('#comment').val();
        $('#comment').val(txt.replace(/[\n\r]+/g, " "));

    });
});