import type { PdfPageContent } from '../models/PdfPageContent.js';
/**
 * Composes consecutive PDF pages that belong to the same article into a single
 * page. The continuity decision (document-agnostic, ad-aware) lives in
 * ./heuristics/pageContinuity; this class only handles grouping and merging.
 */
export declare class PdfPageComposer {
    /**
     * Analyze and compose pages that have continuous content flow.
     * @param pages Array of PDF page content
     * @returns Array of composed pages with merged continuous content
     */
    static composePages(pages: PdfPageContent[]): PdfPageContent[];
    /**
     * Both pages carry the IDENTICAL running-head token set, the set names a
     * subject (2+ tokens), and at least one token is rare document-wide.
     *
     * All three conditions are load-bearing. An article's kicker repeats
     * verbatim on its pages ("BUSINESS stable fly" / "stable fly BUSINESS" =
     * the same set), while two adjacent articles of one section differ ("CEO
     * report UPFRONT" vs "UPFRONT CEO"). The 2-token minimum drops bare section
     * labels ("minews", "BEEINFORMED") that facing pages of DIFFERENT articles
     * share verbatim. The rarity bound drops long-running section kickers.
     */
    private static hasSharedRareRunningHead;
    /**
     * Compose multiple pages into a single page with proper element ordering.
     */
    private static composePageGroup;
    /**
     * Concatenate elements page by page, preserving the per-page reading order
     * already established by PdfElementComposer.
     */
    private static orderElementsSpatially;
}
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