import { AsyncIterableX } from '../asynciterablex';
import { OperatorAsyncFunction } from '../../interfaces';
export interface TimeInterval<T> {
    value: T;
    elapsed: number;
}
export declare class TimeIntervalAsyncIterable<TSource> extends AsyncIterableX<TimeInterval<TSource>> {
    private _source;
    constructor(source: AsyncIterable<TSource>);
    [Symbol.asyncIterator](): AsyncGenerator<{
        value: TSource;
        elapsed: number;
    }, void, unknown>;
}
export declare function timeInterval<TSource>(): OperatorAsyncFunction<TSource, TimeInterval<TSource>>;