/**
 * Encoding and fail-closed decoding for the application mailbox's index
 * records (WFT-84): the per-mailbox header, idempotency bindings, and the
 * entries of the delivery, listing, and terminal-retention indexes.
 *
 * Kept apart from the command-record codec so each stays under the repository's
 * file ceiling while carrying its full rationale.
 *
 * @module core/mailbox-index-codec
 */
import type { ApplicationCommandIdempotencyRecord, MailboxRecord } from './mailbox-types.ts';
/**
 * Decode the per-mailbox header holding the FIFO allocator and backlog counter.
 *
 * @throws {PersistedDataCorruptError} When the stored bytes are malformed.
 */
export declare function decodeMailboxRecord(bytes: Uint8Array, key: string): MailboxRecord;
/**
 * Encode the per-mailbox header.
 */
export declare function encodeMailboxRecord(record: MailboxRecord): Uint8Array;
/**
 * Decode an idempotency index record.
 *
 * @throws {PersistedDataCorruptError} When the stored bytes are malformed.
 */
export declare function decodeApplicationCommandIdempotencyRecord(bytes: Uint8Array, key: string): ApplicationCommandIdempotencyRecord;
/**
 * Encode an idempotency index record.
 */
export declare function encodeApplicationCommandIdempotencyRecord(record: ApplicationCommandIdempotencyRecord): Uint8Array;
/**
 * Decode the command id stored in a FIFO delivery-index entry.
 *
 * @throws {PersistedDataCorruptError} When the entry is not a non-empty string.
 */
export declare function decodeApplicationReadyEntry(bytes: Uint8Array, key: string): string;
/**
 * Encode a FIFO delivery-index entry.
 */
export declare function encodeApplicationReadyEntry(commandId: string): Uint8Array;