import { OperatorFunction, SchedulerLike, Timestamp as TimestampInterface } from '../types'; /** * @param scheduler * @return {Observable<Timestamp<any>>|WebSocketSubject<T>|Observable<T>} * @method timestamp * @owner Observable */ export declare function timestamp<T>(scheduler?: SchedulerLike): OperatorFunction<T, Timestamp<T>>; export declare class Timestamp<T> implements TimestampInterface<T> { value: T; timestamp: number; constructor(value: T, timestamp: number); }