import { AsyncSeq, AllIterables } from '../../AsyncSeq';
/**
 * Generates a sequence whose values are the result of sequential execution of a single Promise or multiple Promises;
 * Promise execution is delayed until the sequence is enumerated.
 *
 * ```typescript
 * const sleepAndRandom = (ms: number) => new Promise(resolve => setTimeout(() => resolve(Math.floor(Math.random() * 100)),ms));
 *
 * const result1 = await deferFromPromise(async () => await sleepAndRandom(1000)).pipe(repeatAsync(3)).toArrayAsync();
 * //3 seconds later...result1: [72,14,91]
 * //sleepAndRandom is executed every time.
 * ```
 *
 * @param sourceFactory Function that returns Promise or multiple enumerable Promises.
 * @returns A sequence in which the generation of sources is delayed until the actual enumeration begins.
 * @typeParam T Source element type.
 * @category Async Generators
 *
 */
export declare function deferFromPromise<T>(sourceFactory: () => Promise<T> | AllIterables<Promise<T>>): AsyncSeq<T>;