import { BlockHash, StorageData, StorageKey } from '@dedot/codecs';
import type { Callback, Unsub } from '@dedot/types';
import { LegacyClient } from '../client/LegacyClient.js';
import { BaseStorageQuery } from './BaseStorageQuery.js';
/**
 * @name LegacyStorageQuery
 * @description
 * Implementation of BaseStorageQuery for the legacy JSON-RPC API (v1).
 * This service handles storage queries using the state_queryStorageAt and
 * state_subscribeStorage RPC methods.
 *
 * It provides:
 * - One-time queries using state_queryStorageAt
 * - Subscriptions using state_subscribeStorage
 * - Efficient change tracking for subscriptions
 */
export declare class LegacyStorageQuery extends BaseStorageQuery {
    protected client: LegacyClient<any>;
    constructor(client: LegacyClient<any>);
    /**
     * Query multiple storage items in a single call using state_queryStorageAt
     *
     * @param keys - Array of storage keys to query
     * @param at - Optional block hash to query at (defaults to current/best block)
     * @returns Promise resolving to a record mapping storage keys to their values
     */
    query(keys: StorageKey[], at?: BlockHash): Promise<Record<StorageKey, StorageData | undefined>>;
    /**
     * Subscribe to multiple storage items using state_subscribeStorage
     *
     * @param keys - Array of storage keys to subscribe to
     * @param callback - Function to call when storage values change
     * @returns Promise resolving to an unsubscribe function
     */
    subscribe(keys: StorageKey[], callback: Callback<Record<StorageKey, StorageData | undefined>>): Promise<Unsub>;
}