How to use the @sanity/desk-tool/structure-builder.divider function in @sanity/desk-tool

export default () =>
  S.list()
    .id('root')
    .title('Content')
    .items([
      S.documentListItem()
        .id('foo-bar')
        .title('Singleton author')
        .schemaType('author'),

      S.divider(),

      S.listItem()
        .title('Anything with a title')
        .icon(() =&gt; <span style="{{fontSize:">T</span>)
        .child(() =&gt;
          delay(
            S.documentList({
              id: 'title-list',
              title: 'Titles!',
              options: {
                filter: 'defined(title)'
              }
            })
          )
        ),