/**
 * PdfSpreadSplitter — turns two-page-spread PDFs into logical single pages.
 *
 * Runs directly after raw page extraction and BEFORE PdfElementComposer, so
 * every downstream stage (element composition, cleaning, page composition,
 * minify) sees normal single-page geometry and needs no spread awareness.
 *
 * The one contract downstream code must honor: after splitting, `pageIndex`
 * is a LOGICAL sequence, not a PDF page number. Anything that touches the
 * physical PDF (screenshot rasterization) must resolve the physical page via
 * `page.metadata.spread` (see SpreadSourceInfo).
 */
import type { PdfDecomposerDecomposedPage } from '../types/decomposer.types.js';
import type { SpreadHandling } from './spread/types.js';
export declare class PdfSpreadSplitter {
    /**
     * Split spread pages into logical half pages according to `mode`.
     *
     * - 'off':   returns the input untouched.
     * - 'auto':  splits only when document-level evidence says spread.
     * - 'split': skips detection and splits every landscape page.
     *
     * Pages are renumbered into a continuous logical sequence; each output page
     * carries `metadata.spread` with its physical source identity.
     */
    static splitPages(pages: PdfDecomposerDecomposedPage[], mode: SpreadHandling): PdfDecomposerDecomposedPage[];
    /** One logical page holding the given half's elements, coordinates re-based. */
    private static buildHalfPage;
    /** Tag a page kept whole so physical-page resolution survives renumbering. */
    private static tagFullPage;
    private static sourceInfo;
    /**
     * Rewrite page and element indices into one continuous logical sequence.
     * After this, pageIndex/pageNumber express reading order, not PDF pages.
     */
    private static renumberSequentially;
}
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