/**
 * Entity-relationship (ER) rendering. Produces Graphviz DOT where each table is
 * an HTML-label node listing its columns (primary-key columns marked `PK`), with
 * a foreign-key edge from each table to the table it references.
 *
 * Built deterministically (tables and foreign keys sorted; columns kept in
 * declared order) for stable, diff-friendly SVG output.
 */
import { World } from '../world';
/**
 * Build Graphviz DOT for the entity-relationship diagram of a loaded root.
 *
 * @param world The loaded dataset root.
 * @returns A DOT `digraph` document.
 */
export declare function buildErDot(world: World): string;