/**
 * The bounded drain for the application delivery outbox (WFT-85): deliver
 * everything that is due, then everything that becomes due within the budget,
 * running a maintenance pass between rounds so lapsed leases are recovered,
 * and report counts only.
 *
 * Split from `outbox-runner.ts` to keep both files under this
 * repository's file-size ceiling.
 *
 * @module core/outbox-drain
 */
import type { OutboxDrainReport } from './outbox-contract.ts';
import type { OutboxRuntime } from './outbox-internals.ts';
/**
 * Deliver everything that is due, then everything that becomes due within the
 * budget, running a maintenance pass before the first round and whenever a
 * round finds nothing due, so lapsed leases are recovered without rescanning
 * the outbox before every send. Reports counts only, and `pending` from the
 * durable header, so a forced stop never claims anything it did not commit.
 *
 * The budget is one stop signal for the whole drain: it ends the sleeps, the
 * maintenance passes, and an in-flight send alike, so a drain asked to stop at
 * a deadline stops there rather than after the current delivery.
 */
export declare function drainOutbox(runtime: OutboxRuntime, options: {
    readonly timeoutMs: number;
    readonly signal?: AbortSignal | undefined;
    readonly pollIntervalMs?: number | undefined;
}): Promise<OutboxDrainReport>;