/**
 * Timing helpers shared by the durable application primitives (the command
 * mailbox, WFT-84, and the delivery outbox, WFT-85): the deterministic retry
 * backoff every reschedule uses, and the abortable sleep every polling wait
 * uses.
 *
 * @module core/application-primitive-timing
 */
/** Deterministic exponential backoff. No jitter, so redelivery timing is testable. */
export declare function computeRetryBackoffMs(attempt: number, baseMs: number, maximumMs: number): number;
/**
 * Sleep, resolving `false` when the wait was aborted or the primitive disposed
 * and `true` when the interval actually elapsed.
 *
 * The listeners are removed on every path, including the timer path, so a
 * long-lived primitive does not accumulate abort listeners once per poll.
 */
export declare function delayUnlessAborted(milliseconds: number, disposal: AbortSignal, signal?: AbortSignal): Promise<boolean>;