budibase/packages/bbui/src/Actions/autoresize_textarea.js

function resize({ target }) {
  target.style.height = "1px"
  target.style.height = +target.scrollHeight + "px"
}

export default function text_area_resize(el) {
  resize({ target: el })
  el.style.overflow = "hidden"
  el.addEventListener("input", resize)

  return {
    destroy: () => el.removeEventListener("input", resize),
  }
}