/**
 * Promise-based sleep that short-circuits when the supplied abort signal
 * fires. Poll and retry loops that can be running when a shutdown signal
 * arrives (SIGTERM in a worker, an ECS stop of the gate container) MUST use
 * this for inter-attempt delays so the signal does not stall for the full
 * sleep. Resolves (never rejects) on abort; callers check `signal.aborted`
 * after waking. Shared by `@fjall/clickhouse`, `@fjall/schema-gate` and
 * `@fjall/deploy-core`.
 */
export declare function sleepAbortable(ms: number, signal?: AbortSignal): Promise<void>;