export declare type LayerStackPriority = 'high' | 'low' | number;
export interface LayerStackEntry<TItem = {}> {
    id: string;
    item: TItem;
    priority: LayerStackPriority;
    sequence: number;
    tags?: string[];
}
export declare class LayerStack<TItem = {}> {
    private _entries;
    private _nextSequence;
    add(item: TItem, priority?: LayerStackPriority, tags?: string | string[]): LayerStackEntry<TItem>;
    get entries(): Array<LayerStackEntry<TItem>>;
    getEntries(filter: (entry: LayerStackEntry<TItem>) => boolean): LayerStackEntry<TItem>[];
    getItems(filter: (entry: LayerStackEntry<TItem>) => boolean): LayerStackEntry<TItem>[];
    getItemsByTag(tags: string | string[], matchType?: 'and' | 'or'): LayerStackEntry<TItem>[];
    private getItemsFromEntries;
    get items(): TItem[];
}