import { BoardScene } from './types.js';

/** Default logical canvas (16:9 teaching board). */
declare const DEFAULT_CANVAS: {
    readonly width: 1600;
    readonly height: 900;
};
declare function createEmptyScene(): BoardScene;
/**
 * Structural validation for scene JSON recovered from a `.mboard.svg`
 * payload. Forward-compatibility rule: a HIGHER version than we know is
 * rejected (caller should offer view-only fallback); unknown extra fields
 * at any level are ignored, not rejected.
 */
declare function isBoardScene(value: unknown): value is BoardScene;
/**
 * Board → Markdown extraction (spec §3): structured elements only, in
 * reading order (top-to-bottom, then left-to-right). Strokes, shapes, images,
 * video and audio are intentionally skipped — they live in the board file,
 * which the Markdown document references as an image.
 */
declare function extractMarkdown(scene: BoardScene): string;

export { DEFAULT_CANVAS, createEmptyScene, extractMarkdown, isBoardScene };