/**
 * Query Expander
 * Expands search queries with domain-specific synonyms
 */
/**
 * Configuration for query expansion
 */
export interface QueryExpansionConfig {
    /** Whether query expansion is enabled */
    enabled: boolean;
    /** Maximum number of expanded queries to generate */
    maxVariants: number;
    /** Custom synonym map (key → alternatives) */
    customSynonyms?: Map<string, string[]>;
}
export declare const DEFAULT_EXPANSION_CONFIG: QueryExpansionConfig;
/**
 * Query Expander class
 */
export declare class QueryExpander {
    private config;
    private synonyms;
    constructor(config?: Partial<QueryExpansionConfig>);
    /**
     * Get current configuration
     */
    getConfig(): QueryExpansionConfig;
    /**
     * Expand a query into multiple variants
     */
    expand(query: string): string[];
    /**
     * Get synonyms for a specific word
     */
    getSynonyms(word: string): string[];
    /**
     * Check if a word has synonyms
     */
    hasSynonyms(word: string): boolean;
    /**
     * Add custom synonyms
     */
    addSynonyms(word: string, synonyms: string[]): void;
}
/**
 * Get or create a query expander
 */
export declare function getQueryExpander(config?: Partial<QueryExpansionConfig>): QueryExpander;
/**
 * Get expansion config from environment or defaults
 */
export declare function getExpansionConfig(): QueryExpansionConfig;
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