How to use the tiptap-extensions.HardBreak function in tiptap-extensions

export default function defaultExtensions(component) {
  const { placeholder, $t, $apollo } = component
  return [
    new Heading(),
    new HardBreak(),
    new Blockquote(),
    new BulletList(),
    new OrderedList(),
    new HorizontalRule(),
    new Bold(),
    new Italic(),
    new Strike(),
    new Underline(),
    new Link(),
    new Heading({ levels: [3, 4] }),
    new ListItem(),
    new Placeholder({
      emptyNodeClass: 'is-empty',
      emptyNodeText: placeholder || $t('editor.placeholder'),
    }),
    new Embed({