import { Observable, SchedulerLike } from 'rxjs'; export declare function bufferTime(this: Observable, bufferTimeSpan: number, scheduler?: SchedulerLike): Observable; export declare function bufferTime(this: Observable, bufferTimeSpan: number, bufferCreationInterval: number | null | undefined, scheduler?: SchedulerLike): Observable; export declare function bufferTime(this: Observable, bufferTimeSpan: number, bufferCreationInterval: number | null | undefined, maxBufferSize: number, scheduler?: SchedulerLike): Observable;