import { PdfFile } from './document.js';
import { Reconstruction } from './flow-build.js';
/** §9.10.2 — a glyph the face maps to no character (see `./font`). */
export declare const UNMAPPED = "\uFFFD";
/**
 * Heuristically reconstruct an untagged PDF into a {@link Reconstruction}
 * (E-PDF EP4). With no structure tree there is only positioned content, so
 * reading order is recovered the way a human eye does: split a clean two-column
 * page at its central gutter (EP17), then within each column cluster runs
 * sharing a baseline into lines, order each line left-to-right inserting spaces
 * across gaps, group lines into paragraphs by their vertical spacing, and
 * interleave the column's images and filled vector paths (EP10) by their top
 * edge. Each run's `href` is carried through as a span so links survive, and a
 * font size well above the document median is guessed as a heading. The result
 * is inherently approximate.
 *
 * @param file The PDF to reconstruct.
 * @returns The reconstructed {@link FlowDoc} plus any read-time losses.
 */
export declare function reconstructByLayout(file: PdfFile, mode?: 'flow' | 'positional'): Reconstruction;
/**
 * Whether a line ENDED a paragraph, rather than wrapping into the next.
 *
 * Leading alone cannot tell the two apart: five labels stacked at 15pt with a
 * 12pt face look exactly like five wrapped lines, and alphatrans.pdf's five are
 * read as one paragraph and re-wrapped into two. But a wrapping engine pulls
 * the next word UP — so a line that stops well short of the measure stopped
 * because its author stopped it, and the line after it begins something new.
 * The same rule separates two paragraphs set with no extra space between them,
 * which used to run together for the same reason.
 *
 * Only where both lines start at the same edge. Where they do not, the block is
 * placed rather than set — a centred title's every line is short of the measure
 * and none of them ends anything.
 *
 * @param prev   The line before: where it starts, how wide it is, its face.
 * @param next   The line after — only where it starts matters.
 * @param column The measure both were set in, when it is known.
 * @returns Whether the first line ended a paragraph.
 */
export declare function endedParagraph(prev: {
    x: number;
    width: number;
    fontSize: number;
}, next: {
    x: number;
}, column: {
    left: number;
    right: number;
} | undefined): boolean;