import type { Heading } from '../../navigation/types.js';
/**
 * Extracts all headings from a Markdown string and adds URL-friendly slugs to each heading.
 * Uses GithubSlugger to generate consistent slugs that match GitHub's heading anchor format.
 *
 * @param input - The Markdown string to extract headings from
 * @returns Array of heading objects containing value, depth, and slug
 *
 * @example
 * const markdown = `
 * # Getting Started
 * ## Installation
 * ### Requirements
 * `
 * const headings = getHeadingsFromMarkdown(markdown)
 * // Returns:
 * // [
 * //   { value: 'Getting Started', depth: 1, slug: 'getting-started' },
 * //   { value: 'Installation', depth: 2, slug: 'installation' },
 * //   { value: 'Requirements', depth: 3, slug: 'requirements' }
 * // ]
 */
export declare function getHeadingsFromMarkdown(input: string): Heading[];
type HeadingLevels = 1 | 2 | 3 | 4 | 5 | 6;
/**
 * Returns the lowest heading level from a list of headings.
 *
 * @param headings - Array of heading objects containing depth property
 * @returns The lowest heading level (1-6) or 1 if no valid headings found
 *
 * @example
 * const headings = [
 *   { value: 'Getting Started', depth: 1 },
 *   { value: 'Installation', depth: 2 }
 * ]
 * getLowestHeadingLevel(headings) // Returns: 1
 */
export declare const getLowestHeadingLevel: (headings: Heading[]) => HeadingLevels;
export {};
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