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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { deferred } from "./deferred.ts";
/** Make Promise or AsyncIterable abortable with the given signal. */export function abortable<T>(p: Promise<T>, signal: AbortSignal): Promise<T>;export function abortable<T>(  p: AsyncIterable<T>,  signal: AbortSignal,): AsyncGenerator<T>;export function abortable<T>(  p: Promise<T> | AsyncIterable<T>,  signal: AbortSignal,): Promise<T> | AsyncIterable<T> {  if (p instanceof Promise) {    return abortablePromise(p, signal);  } else {    return abortableAsyncIterable(p, signal);  }}
/** Make Promise abortable with the given signal. */export function abortablePromise<T>(  p: Promise<T>,  signal: AbortSignal,): Promise<T> {  if (signal.aborted) {    return Promise.reject(createAbortError(signal.reason));  }  const waiter = deferred<never>();  const abort = () => waiter.reject(createAbortError(signal.reason));  signal.addEventListener("abort", abort, { once: true });  return Promise.race([    waiter,    p.finally(() => {      signal.removeEventListener("abort", abort);    }),  ]);}
/** Make AsyncIterable abortable with the given signal. */export async function* abortableAsyncIterable<T>(  p: AsyncIterable<T>,  signal: AbortSignal,): AsyncGenerator<T> {  if (signal.aborted) {    throw createAbortError(signal.reason);  }  const waiter = deferred<never>();  const abort = () => waiter.reject(createAbortError(signal.reason));  signal.addEventListener("abort", abort, { once: true });
  const it = p[Symbol.asyncIterator]();  while (true) {    const { done, value } = await Promise.race([waiter, it.next()]);    if (done) {      signal.removeEventListener("abort", abort);      return;    }    yield value;  }}
// This `reason` comes from `AbortSignal` thus must be `any`.// deno-lint-ignore no-explicit-anyfunction createAbortError(reason?: any): DOMException {  return new DOMException(    reason ? `Aborted: ${reason}` : "Aborted",    "AbortError",  );}