/**
 * Extracts topics from the given text
 * @param text The text to extract topics from
 * @param limit Optional limit for the number of topics to return (default: 5)
 * @returns An array of extracted topics
 */
export declare function extractTopics(text: string, limit?: number): string[];
/**
 * Calculates the difficulty score of the text based on word length, sentence complexity, etc.
 * @param text The text to analyze
 * @returns A difficulty score between 0 (easy) and 1 (difficult)
 */
export declare function calculateDifficulty(text: string): number;