/**
 * Shared CLI parsing for the `--storage` backend flag. Centralizes the valid
 * backend set and the persistent-only restriction so the top-level argument
 * parser and the schedule subcommand parser agree on validation.
 *
 * @module cli/storage-backend-arguments
 */
import type { PersistentStorageBackend, StorageBackend } from './types.ts';
/** Validate a `--storage` value, defaulting to `sqlite` when omitted. */
export declare function parseStorageBackend(value: string | undefined): StorageBackend;
/**
 * Validate a `--storage` value for commands that must persist data across CLI
 * invocations (e.g. schedules). Rejects the in-memory backend.
 */
export declare function parsePersistentStorageBackend(value: string | undefined): PersistentStorageBackend;