import { IqCodec } from '../../IqCodec';
import { IQQuery } from '../../../typedef/iq/IQQuery';
import { IQResult } from '../../../typedef/iq/IQResult';
export declare class PingCodec implements IqCodec {
    encodeQueryContent(query: IQQuery): any | null;
    encodeResultContent(result: IQResult): any | null;
    decodeQuery(id: string, content: any): IQQuery | null;
    decodeResult(id: string, content: any): IQResult | null;
}