Discussion on using StructureBuilder and getting document types with icons in Sanity v3.

import StructureBuilder from '@sanity/desk-tool/structure-builder';

export function getDefaultStructure() {
  const items = StructureBuilder.documentTypeListItems();
  return StructureBuilder.list()
    .id('__root__')
    .title('Content')
    .showIcons(items.some((item) => item.getSchemaType().icon))
    .items(items);
}

{getDefaultStructure().items
          .filter((item) => item.type !== 'divider')
          .map((item) => {
            const Icon = getIconComponent(item);
            return (
              <div key={item.id}>
                <Link
                  className={styles.link}
                  href={`/${getEnvironmentName()}/desk/${item.id}`}>
                  <div className={styles.iconWrapper}>
                    <Icon />
                  </div>
                  <div>{item.title}</div>
                </Link>
              </div>
            );
          })}