export declare enum ExtentType {
    MainContentPageCount,
    TotalTextLength,
    FrontMatterPageCount,
    BackMatterPageCount,
    TotalNumberedPages,
    ProductionPageCount,
    AbsolutePageCount,
    NumberOfPagesInPrintCounterpart,
    Duration,
    NotionalNumberOfPagesInDigitalProduct,
    ContentPageCount,
    TotalUnnumberedInsertPageCount,
    DurationOfIntroductoryMatter,
    DurationOfMainContent,
    DurationOfBackMatter,
    ProductionDuration,
    NumberOfCards,
    Filesize,
    StorageFilesize
}