Remove red squiggles for spellcheck on text entry.

I'm using the following code to add a scrollbar to a lengthy text entry box, and I want to add code so that red squiggles for spellcheck don't appear.  How do I do that?

const TextAreaScrollbar = () => {
  const textAreas = document.querySelectorAll('.acc-textinput');

  textAreas.forEach(textArea => {
    textArea.style.scrollbarWidth = 'thin';
  });
};

setTimeout(TextAreaScrollbar, 100);