RenaiApp/src/shared/types/entity-api/base/hierarchical.d.ts

/**
 * Entities implementing this interface build a hierarchy.
 */
interface HierarchicalInterface<T> {
  /**
   * parent entities
   */
  parents: Promise<T[]> | Identifier[];

  /**
   * child entities
   */
  children: Promise<T[]> | Identifier[];
}