import { SelectorFn } from '@collectable/core';
import { Sorted, ValueMap } from './types';
export declare function setItem<T>(value: T, map: ValueMap<T>, tree: Sorted<T>, select: SelectorFn<T, any> | undefined): boolean;
export declare function unsetItem<T>(value: T, map: ValueMap<T>, tree: Sorted<T>): boolean;