import type { Topic, TopicHierarchy, DocumentArea } from '../types/index.js';
/**
 * Topic Index - parses index.md files to build hierarchical topic structure
 */
export declare class TopicIndex {
    private hierarchies;
    private docsPath;
    constructor(docsPath?: string);
    /**
     * Builds the topic index by parsing index.md files
     */
    build(): Promise<void>;
    /**
     * Parses an index.md file to extract topic hierarchy
     */
    private parseIndexFile;
    /**
     * Parses topics from index.md content
     * Expects format like:
     * - [Topic Title](path/to/file.md)
     *   - [Subtopic](path/to/subtopic.md)
     */
    private parseTopicsFromContent;
    /**
     * Counts total number of topics (including children)
     */
    private countTopics;
    /**
     * Gets the topic hierarchy for a specific area
     */
    getHierarchy(area: DocumentArea): TopicHierarchy | undefined;
    /**
     * Gets topics up to a specific depth
     */
    getTopicsWithDepth(area: DocumentArea, maxDepth: number): Topic[];
    /**
     * Filters topics by maximum depth
     */
    private filterByDepth;
    /**
     * Finds topics under a specific parent path
     */
    getTopicsUnderPath(area: DocumentArea, parentPath: string): Topic[];
    /**
     * Finds a topic by its path
     */
    private findTopicByPath;
    /**
     * Flattens the topic hierarchy into a list
     */
    flattenTopics(topics: Topic[]): Topic[];
    /**
     * Gets all topics for an area (flattened)
     */
    getAllTopics(area: DocumentArea): Topic[];
}
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