import { Page } from '../../ImageCropDialog';
/**
 * Custom hooks for thumbnail.
 * @param {string} thumbnail Source for the thumbnail.
 * @return {Object} Object.
 */
export declare const useThumbnail: (thumbnail: any) => {
    page: Page;
    currentThumbnail: any;
    isDialogVisible: boolean;
    isPartDialogHidden: boolean;
    isThumbnailChanged: boolean;
    onImageCropOpen: (currentPage: Page) => void;
    onImageCropCancel: () => void;
    onImageCropSave: (image: string) => void;
};