export interface KeywordResult {
    cardId: string;
    rank: number;
}
/**
 * FTS5 operators that must be excluded to prevent query injection.
 * Tokens are left unquoted so the Porter stemmer can apply its stemming rules
 * (quoted tokens in FTS5 bypass tokenizers and do exact-match only).
 */
declare const FTS5_OPERATORS: Set<string>;
/**
 * Builds an AND query (space-separated tokens, implicit AND in FTS5).
 * High precision — requires all tokens to appear in a card.
 */
export declare function buildAndQuery(tokens: string[]): string;
/**
 * Builds an OR query (tokens joined with OR).
 * High recall — any token match qualifies.
 */
export declare function buildOrQuery(tokens: string[]): string;
/**
 * Sanitizes raw text into a safe FTS5 query (OR mode, for backward compat).
 * Used by tests and callers that explicitly want OR semantics.
 */
export declare function sanitizeFts5Query(raw: string): string;
export { FTS5_OPERATORS };
/**
 * Performs full-text search against the `cards_fts` FTS5 virtual table.
 *
 * Strategy: AND-first, then OR fallback.
 * - AND pass: requires ALL tokens to appear in a card (high precision).
 *   e.g. "inactive patient authorization" → only cards that mention all three.
 * - OR fallback: if AND returns nothing, retries with any-token match (high recall).
 *   Prevents zero results for multi-word queries where tokens are spread across fields.
 *
 * Column weights: title(3.0), content(1.0), flow(2.0), source_repos(2.0), tags(1.5), identifiers(2.0)
 */
export declare function keywordSearch(query: string, limit?: number): KeywordResult[];
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