JSFiddle - React, Tailwind, and code Playground

HTML

<form id="inputform">
 <textarea id="usermsg"></textarea>
</form>

JavaScript

inputform.addEventListener('keypress', function(e) {
 const tgt = e.target;
 
 if (tgt.id==="usermsg") {
  if (e.which == 13 && !e.shiftKey && tgt.value) {
    tgt.value = '';
    tgt.setSelectionRange(0,0);
  }
 }
});