/**
 * Claims for the application delivery outbox (WFT-85): leasing the earliest
 * due delivery to one attempt and handing that attempt a digest-verified
 * payload, the credential reference, and an attempt-scoped abort signal.
 *
 * The due index is time-keyed, so a claim considers the earliest entries and
 * takes the first one that is due now. A delivery in retry backoff never holds
 * back one that is due, which is the deliberate difference from the mailbox's
 * strict FIFO.
 *
 * @module core/outbox-delivery
 */
import type { ApplicationDeliveryClaimedPayload, OutboxClaimResult } from './outbox-contract.ts';
import { type OutboxRuntime } from './outbox-internals.ts';
import { type ApplicationDeliveryRecord } from './outbox-types.ts';
/** How many due-index entries a non-mutating due-work observation looks past. */
export declare const DUE_HEAD_LOOKAHEAD = 8;
/**
 * Recompute an inline payload's digest and fail closed on a mismatch. A
 * reference payload is handed over unverified, with the stored digest.
 *
 * @throws {PersistedDataCorruptError} When a stored inline payload no longer
 * matches the digest enqueue recorded for it.
 */
export declare function verifyClaimedPayload(runtime: OutboxRuntime, record: ApplicationDeliveryRecord): Promise<ApplicationDeliveryClaimedPayload>;
/**
 * Lease the earliest due delivery to one attempt.
 *
 * Only a lost compare-and-swap counts toward contention; housekeeping that
 * discarded an orphaned entry is progress.
 */
export declare function claimNextDelivery(runtime: OutboxRuntime, options?: {
    readonly signal?: AbortSignal | undefined;
}): Promise<OutboxClaimResult>;