import type { PdfPageContent } from '../models/PdfPageContent.js';
/**
 * Element composition pipeline: groups raw text runs into paragraphs and
 * headings in reading order, preserving images.
 *
 * Three stages, each a pure module under ./composer/:
 *   1. overlapMerge   - spatial merging of runs into composites (column-aware)
 *   2. readingOrder   - human reading order (preservation invariant: the
 *                       output is a permutation of the input, never a filter)
 *   3. textTypes      - h1-h5 / paragraph classification by font size
 * plus dropCaps (decorative first letters merged back into their paragraph).
 */
export declare class PdfElementComposer {
    /**
     * Compose elements by grouping text elements into paragraphs while preserving images.
     * @param pages Array of PDF page content with raw elements
     * @returns Array of PDF page content with composed elements (paragraphs + images)
     */
    static composeElements(pages: PdfPageContent[]): PdfPageContent[];
    /**
     * Compose elements for a single page.
     */
    private static composePageElements;
    /**
     * Convert composites back to PdfElements, mapping the stage-3 classification
     * onto the element type.
     */
    private static convertToElements;
    /**
     * Merge text and non-text elements while preserving the algorithmic order of
     * the text elements. Non-text elements are position-sorted and interleaved
     * by vertical position.
     */
    private static interleaveWithNonText;
}
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