/**
 * @module gateway/jitter
 *
 * Symmetric interval jitter for periodic loops. Without it, every device fires
 * its heartbeat/discovery on the same fixed cadence, so a fleet hammers the
 * platform in lockstep — worst of all during recovery, when they all reconnect
 * at once (a thundering herd). A small ±ratio spread decorrelates them.
 */
/** Apply ±`ratio` jitter to `baseMs` (default ±15%). */
export declare function jittered(baseMs: number, ratio?: number): number;