/**
 * @packageDocumentation
 * @module Utility
 */
import { Observable } from 'rxjs';
/**
 * Creates an Observable source from a ReadableStream source that will emit any
 * values emitted by the stream.
 *
 * @category Streams
 *
 * @see {@link https://stackblitz.com/edit/rxjs-readable-stream|StreamAPI Number Stream}
 * @see {@link https://stackblitz.com/edit/rxjs-readable-stream-fetch|Fetch + StreamAPI Demo}
 *
 * @param stream The ReadableStream to subscribe to
 * @param signal Optional {@link https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal|AbortSignal} to provide
 *   to the underlying stream
 * @param queueStrategy Optional strategy for backpressure queueing
 * @param throwEndAsError Optional to return an error when the `AbortSignal` has been fired instead of just closing
 *
 * @example Create a ReadableStream of `0` to `100` and convert to an Observable
 * ```ts
 * const stream = new ReadableStream({
 *   start: (controller) => {
 *    for (let i = 0; i <100; i++) {
 *      controller.enqueue(i)
 *    }
 *    controller.close();
 *   }
 * });
 *
 * fromReadableStream(stream).pipe(reduce((a, b) => a + b)).subscribe();
 * ```
 * Output: `4950`
 *
 * @returns Observable that emits from a ReadableStream source
 */
export declare function fromReadableStream<T extends unknown>(stream: ReadableStream<T>, signal?: AbortSignal, queueStrategy?: QueuingStrategy, throwEndAsError?: boolean): Observable<T>;