/**
 * outbox.ts — W5: idb-keyval-backed optimistic outbox.
 *
 * Provides enqueue / dequeue / pending helpers for PendingMessage entries.
 * Key format: 'outbox:<roomId>' — one array per room.
 */
export interface PendingMessage {
    msgId: string;
    roomId: string;
    senderUid: string;
    /** Standard base64 encoding of the sealed ArrayBuffer. */
    sealedB64: string;
    threadRootMsgId?: string;
    /** W9: marketplace product reference persisted with the outbox entry. */
    productRef?: string;
    /** W9: marketplace product metadata persisted with the outbox entry. */
    productMeta?: unknown;
    attempts: number;
    enqueuedAt: number;
}
/**
 * Append a message to the outbox for roomId.
 *
 * Uses idb-keyval's `update()` (single readwrite IndexedDB transaction wrapping
 * get+put with a synchronous updater) instead of separate get()/set() calls —
 * two un-awaited enqueue()s for the same room previously lost a message: both
 * read the same stale array before either wrote back (lost-update race, HIGH
 * council finding). A single transaction serializes overlapping readwrite
 * transactions on the same store, closing the window.
 */
export declare function enqueue(roomId: string, msg: PendingMessage): Promise<void>;
/** Remove a specific message from the outbox by msgId. Atomic — see enqueue(). */
export declare function dequeue(roomId: string, msgId: string): Promise<void>;
/** Return all pending messages for roomId. */
export declare function pending(roomId: string): Promise<PendingMessage[]>;
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