export declare const getSpineItemNumberOfPages: ({ itemHeight, itemWidth, isUsingVerticalWriting, pageWidth, pageHeight, pageTurnDirection, pageTurnMode, }: {
    itemWidth: number;
    itemHeight: number;
    isUsingVerticalWriting: boolean;
    pageWidth: number;
    pageHeight: number;
    pageTurnDirection: "vertical" | "horizontal";
    pageTurnMode: "scrollable" | "controlled";
}) => number;