/**
 * The adapter runner for the application delivery outbox (WFT-85): one due
 * delivery claimed, durably marked `attempting`, handed to the configured
 * transport, and settled on what the transport reported. The bounded drain
 * that repeats it lives in `outbox-drain.ts`.
 *
 * The runner never trusts the adapter's completion as a disposition. It
 * validates the outcome, then commits the matching transition fenced on the
 * attempt token and the `attempting` bytes; only that commit moves the record.
 * A thrown adapter error is an unknown outcome, because the request may have
 * left the process. When the attempt deadline elapses while the send is in
 * flight the runner stops waiting, treats the result as unknown, and aborts
 * the adapter's signal as it releases the attempt.
 *
 * @module core/outbox-runner
 */
import type { ApplicationDeliveryAdapter, OutboxDeliverResult } from './outbox-contract.ts';
import { type OutboxRuntime } from './outbox-internals.ts';
/**
 * Claim the earliest due delivery, run it through the adapter, and settle it.
 *
 * The `attempting` commit happens before the adapter is called; a claim whose
 * begin is refused (cancelled or reclaimed between the two) is released
 * without calling the transport.
 */
export declare function deliverNext(runtime: OutboxRuntime, options?: {
    readonly signal?: AbortSignal | undefined;
}): Promise<OutboxDeliverResult>;
/** The configured adapter, or the caller-mistake diagnostic when there is none. */
export declare function requireAdapter(runtime: OutboxRuntime): ApplicationDeliveryAdapter;