/**
 * Query Expansion System
 *
 * Expands search queries to improve recall:
 * - Synonym expansion
 * - Related terms
 * - Common abbreviations
 * - Technical term variations
 */
export interface ExpansionOptions {
    enableSynonyms?: boolean;
    enableAbbreviations?: boolean;
    enableTechnicalTerms?: boolean;
    maxExpansions?: number;
}
export interface ExpandedQuery {
    original: string;
    expanded: string[];
    combinedQuery: string;
}
export declare class QueryExpander {
    private synonyms;
    private abbreviations;
    private technicalTerms;
    constructor();
    /**
     * Expand query with related terms
     */
    expand(query: string, options?: ExpansionOptions): ExpandedQuery;
    /**
     * Add custom synonym mapping
     */
    addSynonym(term: string, synonyms: string[]): void;
    /**
     * Add custom abbreviation mapping
     */
    addAbbreviation(abbreviation: string, expansions: string[]): void;
    /**
     * Add custom technical term mapping
     */
    addTechnicalTerm(term: string, variations: string[]): void;
    /**
     * Initialize synonym mappings
     */
    private initSynonyms;
    /**
     * Initialize abbreviation mappings
     */
    private initAbbreviations;
    /**
     * Initialize technical term mappings
     */
    private initTechnicalTerms;
    /**
     * Tokenize query into terms
     */
    private tokenize;
}
/**
 * Create query expander with default mappings
 */
export declare function createQueryExpander(): QueryExpander;
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