export declare abstract class AbstractNode<Owner> {
    protected _depth: number;
    get depth(): number;
    protected redepthChild(child: AbstractNode<Owner>): void;
    protected abstract redepthChildren(): void;
    protected _parent?: AbstractNode<Owner>;
    get parent(): AbstractNode<Owner> | undefined;
    protected _owner?: Owner;
    get owner(): Owner | undefined;
    attach(owner: Owner): void;
    get attached(): boolean;
    detach(): void;
    protected adoptChild(child: AbstractNode<Owner>): void;
    protected dropChild(child: AbstractNode<Owner>): void;
}