import { UnboundScrollPosition } from '../../navigation/controllers/ScrollNavigationController';
import { Reader } from '../../reader';
export declare const adjustScrollToKeepContentCentered: (scrollContainer: HTMLElement, fromScale: number, toScale: number, marginX: number, marginY: number) => UnboundScrollPosition;
export declare const applyScaleToViewportForScroll: (scale: number, reader: Reader) => void;