/**
 * Multi-strategy FTS5 query builder.
 * Generates OR-mode, AND-mode, and entity-focused queries from natural language.
 */
/** Current active expansions (core + any injected extras). */
export declare const EXPANSIONS: Record<string, string[]>;
/** Merge additional expansions into the active set. Used by benchmarks to add domain-specific synonyms. */
export declare function mergeExpansions(extra: Record<string, string[]>): void;
/**
 * Resolve relative temporal references to absolute date keywords.
 * E.g., "10 days ago" with referenceDate → ["march", "29", "2026"]
 */
export declare function resolveTemporalKeywords(query: string, referenceDate?: Date): string[];
/** Extract meaningful keywords from a query, filtering stop words. */
export declare function extractKeywords(query: string): string[];
/** Extract entities: proper nouns, dates, numbers, specific terms. */
export declare function extractEntities(query: string): string[];
/** Build OR-joined FTS5 query with synonym expansion. Best for broad recall. */
export declare function buildORQuery(query: string): string | null;
/** Build AND-joined FTS5 query. Best for precision when multiple terms matter. */
export declare function buildANDQuery(query: string): string | null;
/** Build relaxed AND query — uses entity + top content words, less strict than full AND. */
export declare function buildRelaxedANDQuery(query: string): string | null;
/** Build phrase query from consecutive keyword pairs. Finds exact multi-word matches. */
export declare function buildPhraseQuery(query: string): string | null;
/** Build entity-focused FTS5 query. Searches for proper nouns and specific terms. */
export declare function buildEntityQuery(query: string): string | null;
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