/**
 * @file validator.ts
 * @author tngan
 * @desc Time-window validators for SAML `NotBefore` / `NotOnOrAfter` conditions.
 */
/** Signed clock-drift tolerance in milliseconds for the two boundaries. */
type DriftTolerance = [number, number];
/**
 * Check whether the current clock falls within the provided SAML time
 * window, applying a symmetric drift tolerance to both ends.
 *
 * Behaviour:
 *   - Both bounds missing: logs a warning and returns `true`.
 *   - Only `utcNotBefore` given: returns true when now is at or after it.
 *   - Only `utcNotOnOrAfter` given: returns true when now is strictly before it.
 *   - Both given: returns true only when both individual checks pass.
 *
 * @param utcNotBefore ISO-8601 lower bound (inclusive) or undefined
 * @param utcNotOnOrAfter ISO-8601 upper bound (exclusive) or undefined
 * @param drift tolerance applied to each bound, defaults to `[0, 0]`
 * @returns whether the current time is within the configured window
 */
declare function verifyTime(utcNotBefore: string | undefined, utcNotOnOrAfter: string | undefined, drift?: DriftTolerance): boolean;
export { verifyTime };