/**
 * Assets' Realtime Data
 * @namespace Streams.futures.assets
 */
/**
 * Subscribe to Assets Realtime Data
 * @async
 * @function subscribe
 * @memberof Streams.futures.assets
 * @param {Array<String>} markets Markets Name
 * @param {function} onData On Data Incomming Callback
 */
export declare function futuresAssetSubscribe(markets: string[], onData: () => any): void;
/**
 * Unsubscribe from Assets Realtime Data
 * @async
 * @function unsubscribe
 * @memberof Streams.futures.assets
 */
export declare function futuresAssetUnsubscribe(): void;
/**
 * Query the Assets' Data on specific markets
 * @async
 * @function query
 * @memberof Streams.futures.assets
 * @param {Array<String>} markets Markets Name
 * @returns {Promise<Object>} Promise object represents the result of the request
 */
export declare function futuresAssetQuery(markets: string[]): Promise<any>;