import { Reader } from '../../reader';
import { Observable } from 'rxjs';
import { Manifest } from '@prose-reader/shared';
export declare const updateSpreadMode: (reader: Reader) => Observable<[Pick<{
    element: HTMLElement;
    pageSize: {
        width: number;
        height: number;
    };
    width: number;
    height: number;
}, "width" | "height">, Manifest]>;