type ItemGroup<I> = [I, ...I[]];
export type CollectorTuple<D, I> = [ItemGroup<I>, D];
export type MinLength1Array<T> = [T, ...T[]];
export interface ICollectorNode<T, I> {
    item: I;
    data: T;
    parent: ICollectorNode<T, I> | null;
    children: ICollectorNode<T, I>[];
    flatten(): MinLength1Array<CollectorTuple<T, I>>;
}
export declare class CollectorNode<D, I> implements ICollectorNode<D, I> {
    data: D;
    item: I;
    private _identity;
    parent: ICollectorNode<D, I> | null;
    children: ICollectorNode<D, I>[];
    constructor(data: D, item: I, _identity: (item: I) => string);
    flatten(): MinLength1Array<CollectorTuple<D, I>>;
}
export {};