import type { PhrasingContent, Root } from 'mdast';
/**
 * Injects a Markdown segment under a specified heading in a Markdown document.
 * Optionally, the injected segment can be made foldable for better readability.
 * @param document The original Markdown document.
 * @param segment The Markdown segment to be injected.
 * @param heading The heading under which the segment is to be injected.
 * @param foldable If true, makes the segment foldable.
 * @returns The modified Markdown document.
 */
export declare function injectMarkdown(document: string, segment: string, heading: string, foldable?: boolean): string;
/**
 * Updates the Table of Contents (TOC) of a Markdown document.
 * The TOC is rebuilt based on the headings present in the document.
 * @param main The main Markdown document.
 * @param heading The heading under which the TOC is to be updated.
 * @returns The Markdown document with an updated TOC.
 */
export declare function updateTOC(main: string, heading: string): string;
/**
 * Converts a PhrasingContent node to its HTML representation.
 * Handles all PhrasingContent types defined in mdast.
 *
 * @param node The phrasing content node to convert.
 * @returns The HTML string representation.
 * @throws {VrtError} For reference types that require resolution (footnote, image, link references).
 */
export declare function nodeToHtml(node: PhrasingContent): string;
export declare function parseMarkdown(document: string): Root;