import type { Rule } from '@bernierllc/validators-core';
import type { MarkdownStructureOptions } from '../types';
interface HeadingHierarchyContext {
    markdown: string;
    options: MarkdownStructureOptions;
}
/**
 * Heading Hierarchy Rule
 *
 * Validates that headings follow proper hierarchy:
 * - h1 should come before h2
 * - h2 should come before h3
 * - No skipping levels (e.g., h1 -> h3)
 * - Optional: First heading must be h1
 *
 * @example
 * ```markdown
 * # Title (h1)
 * ## Section (h2)
 * ### Subsection (h3)
 * ```
 */
export declare const headingHierarchyRule: Rule<HeadingHierarchyContext>;
export {};
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