export type Ping = {
    id: string;
    PING: 'PING';
    sent: number;
};
export type Pong = Omit<Ping, 'PING'> & {
    PING: 'PONG';
    pid: number;
};
export declare const pong: (ping: Ping) => Pong;
export declare function ping(): Omit<Ping, 'id'>;
export declare function ping(id: string): Ping;
export declare const isPong: (msg: any, ping?: Ping) => msg is Pong;
export declare const isPing: (msg: any) => msg is Ping;
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