// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { deferred } from "./deferred.ts";
export function abortable(p, signal) {
    if (p instanceof Promise) {
        return abortablePromise(p, signal);
    } else {
        return abortableAsyncIterable(p, signal);
    }
}
/** Make Promise abortable with the given signal. */ export function abortablePromise(p, signal) {
    if (signal.aborted) {
        return Promise.reject(createAbortError(signal.reason));
    }
    const waiter = deferred();
    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(p, signal) {
    if (signal.aborted) {
        throw createAbortError(signal.reason);
    }
    const waiter = deferred();
    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-any
function createAbortError(reason) {
    return new DOMException(reason ? `Aborted: ${reason}` : "Aborted", "AbortError");
}
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