import { Item } from '../lib/types';
export interface ItemState {
    expanded?: boolean;
    folded?: boolean;
}
export interface GroupItem<T = unknown> {
    items?: T[];
    [key: string]: unknown;
}
export type ItemsState = WeakMap<Item, ItemState>;
declare const symbols: {
    group: symbol;
};
declare const getItemState: (item: Item, itemsState: ItemsState) => ItemState;
declare const isExpanded: (item: Item, itemsState: ItemsState) => boolean;
declare const isFolded: (group: Item, itemsState: ItemsState) => boolean;
declare const isGroup: (item: unknown) => item is GroupItem;
declare const prepareData: <T extends Item>(data: T[] | GroupItem<T>[], displayEmptyGroups: boolean, itemsState: ItemsState) => (T | GroupItem<T>)[] | undefined;
declare const callFn: <T, A extends unknown[]>(fn: ((...args: A) => T) | T, ...args: A) => T;
declare const byReference: <T>(a: T, b: T) => boolean;
export { symbols, prepareData, getItemState, isExpanded, isFolded, isGroup, callFn, byReference, };
//# sourceMappingURL=utils.d.ts.map