/**
 * Natural Query Preprocessing
 *
 * Parses conversational queries and extracts semantic information like:
 * - Topic/keywords
 * - Time hints (last week, in November, recently)
 * - Module hints
 * - Question type
 */
export interface TimeRange {
    since?: Date;
    until?: Date;
    description: string;
}
export type QuestionType = "what" | "when" | "why" | "how" | "general";
export interface NaturalQuery {
    originalText: string;
    extractedTopic: string;
    timeHints: TimeRange | null;
    moduleHints: string[];
    questionType: QuestionType;
    isConversational: boolean;
}
/**
 * Detect if a query is conversational (natural language question vs keyword search)
 */
export declare function isConversationalQuery(text: string): boolean;
/**
 * Detect question type from query text
 */
export declare function detectQuestionType(text: string): QuestionType;
/**
 * Extract time hints from query text
 */
export declare function extractTimeHints(text: string): TimeRange | null;
/**
 * Extract module hints from query text
 * Simple keyword matching for common module-related terms
 */
export declare function extractModuleHints(text: string): string[];
/**
 * Clean and extract topic from conversational query
 */
export declare function cleanQuery(text: string): string;
/**
 * Parse natural language query into structured information
 */
export declare function parseNaturalQuery(text: string): NaturalQuery;