import { RefObject } from 'react';
export type UseVirtualScrollProps = {
    length: number;
    isActive?: boolean;
    onScrollToBottom?: (index: number) => void;
};
export type UseVirtualScrollReturn<ITEM_ELEMENT, SCROLL_ELEMENT> = {
    listRefs: React.RefObject<ITEM_ELEMENT>[];
    scrollElementRef: React.RefObject<SCROLL_ELEMENT>;
    slice: [number, number];
    spaceTop: number;
};
export type Bounds = [[number, number], [number, number]];
export declare const defaultItemsCalculationCount = 5;
export declare const arraysIsEq: (arr1: number[], arr2: number[]) => boolean;
export declare const useScroll: (ref: RefObject<HTMLElement>, fn: () => void, isActive: boolean) => void;
export declare const getElementHeight: (el: HTMLElement | SVGGraphicsElement | null) => number;
export declare const getVisiblePosition: (top: number, height: number, elementMaxSize: number) => [number, number];
export declare const calculateSavedSizes: (savedSizes: number[], sizes: number[]) => number[];
export declare const useCalculateVisiblePosition: (scrollElement: HTMLElement | null, set: (value: React.SetStateAction<[number, number]>) => void, elementsSizes: number[]) => () => void;
export declare const calculateBounds: (savedSizes: number[], sizes: number[], visiblePosition: [number, number], length: number) => Bounds;