/// <reference types="@cardsgame/types" />
/**
 * Decorator!
 * Register an entity class as possible child for any other parent entities.
 *
 * @example
 * ```ts
 * @canBeChild
 * export class ClassicCard extends Entity<ClassicCardOptions> {
 *   // ...
 * }
 * ```
 *
 * @category Annotation
 */
export declare function canBeChild(childConstructor: AnyClass): void;