import type { PushBlob } from './transport.js';
import type { BlobEnvelope } from './envelope.js';
export interface QueueItem {
    idempotency_key: string;
    envelopes: BlobEnvelope[];
    blobs: PushBlob[];
    created_at: string;
    attempts: number;
}
export declare function loadQueue(path: string): QueueItem[];
export declare function enqueue(path: string, q: QueueItem[], envelopes: BlobEnvelope[], blobs: PushBlob[]): QueueItem[];
/** Send queued items oldest-first. On the first send error: bump that item's attempts, persist,
 *  return { ok:false, sent:<items accepted so far> }. On full drain: persist (file removed when
 *  empty), return { ok:true, sent:<all items> }. The caller acks every envelope in `sent`. */
export declare function flushQueue(path: string, q: QueueItem[], send: (item: QueueItem) => Promise<void>): Promise<{
    ok: boolean;
    sent: QueueItem[];
}>;