/**
 * Measured masking-cost warning. Not a security gate.
 *
 * Carry-over builds one matcher per distinct masked value. Cost grows with
 * that count, which `maxRows` caps. Default maxRows stays silent.
 * Raising the cap is allowed — we say so on stderr and in the doctor.
 *
 * Threshold comes from docs/benchmarks/masking-cost-threshold.json
 * (measured, not invented). Keep the number here in sync; test/masking_cost_warn.test.ts
 * checks both.
 */
export declare const MASKING_COST_WARN_ABOVE = 500;
export declare function maxRowsWarns(maxRows: number | undefined): boolean;
export declare function maskingCostWarning(maxRows: number): string;
export declare function warnIfMaxRowsHigh(maxRows: number | undefined): void;
//# sourceMappingURL=masking-cost.d.ts.map