import type { MessageContent } from './protocol/index.js';
export interface OutboxItem {
    clientMsgId: string;
    content: MessageContent;
    ts: number;
}
/** Persists not-yet-acknowledged outgoing messages to localStorage, keyed by
 *  guest token, so a page reload during a connectivity drop doesn't silently
 *  lose what the user typed (the "WhatsApp" guarantee: your message is queued
 *  until it's confirmed sent, even across app restarts). */
export declare class PersistentOutbox {
    private readonly key;
    constructor(token: string);
    /** All pending items, oldest first, with stale (>7d) entries dropped. */
    load(): OutboxItem[];
    add(item: OutboxItem): void;
    /** Remove an item once it's been acknowledged by the server. */
    remove(clientMsgId: string): void;
    private save;
}