/**
 * Copyright (c) Microsoft. All rights reserved.
 */
import React from 'react';
import { LabelerVirtualizationStore } from '../stores/LabelerVirtualizationStore';
import { AnnotationDomData } from '../types/labelerTypes';
/**
 * Tracks scrolling and annotation changes in the labeler to calculate
 * the start and end line indices of the lines to virtual render in the
 * labeler viewport. Updates the `LabelerVirtualizationStore` with the
 * new line indices whenever a change requiring re-evaluation occurs. It
 * also accounts for the annotations visible in the viewport to expand the
 * virtual rendering line indices to ensure annotations visible in the
 * viewport are rendered correctly.
 *
 * Learn more about this hook in `virtualization.md`.
 *
 * @param containerRef The labeler container.
 * @param isLabelerMounted Whether the labeler was fully mounted or not.
 * @param annotationDomData The current annotations added to the labeler.
 * @param virtualizationStore A store that keeps virtualization state.
 * @param isVirtualizationEnabled Whether the labeler is in virtual
 * rendering mode or not.
 */
export declare const useVirtualizer: ({ containerRef, isLabelerMounted, annotationDomData, virtualizationStore, isVirtualizationEnabled }: {
    isLabelerMounted: boolean;
    isVirtualizationEnabled: boolean;
    annotationDomData: AnnotationDomData[];
    virtualizationStore: LabelerVirtualizationStore;
    containerRef: React.MutableRefObject<HTMLDivElement>;
}) => void;