/**
 * @packageDocumentation
 *
 * Pass a promise and an abort signal and await the result.
 *
 * @example Basic usage
 *
 * ```ts
 * import { raceSignal } from 'race-signal'
 *
 * const controller = new AbortController()
 *
 * const promise = new Promise((resolve, reject) => {
 *   setTimeout(() => {
 *     resolve('a value')
 *   }, 1000)
 * })
 *
 * setTimeout(() => {
 *   controller.abort()
 * }, 500)
 *
 * // throws an AbortError
 * const resolve = await raceSignal(promise, controller.signal)
 * ```
 *
 * @example Overriding errors
 *
 * By default the thrown error is the `.reason` property of the signal but it's
 * possible to override this behaviour with the `translateError` option:
 *
 * ```ts
 * import { raceSignal } from 'race-signal'
 *
 * const controller = new AbortController()
 *
 * const promise = new Promise((resolve, reject) => {
 *   setTimeout(() => {
 *     resolve('a value')
 *   }, 1000)
 * })
 *
 * setTimeout(() => {
 *   controller.abort()
 * }, 500)
 *
 * // throws `Error('Oh no!')`
 * const resolve = await raceSignal(promise, controller.signal, {
 *   translateError: (signal) => {
 *     // use `signal`, or don't
 *     return new Error('Oh no!')
 *   }
 * })
 * ```
 */
function defaultTranslate(signal) {
    return signal.reason;
}
export function raceSignal(promise, signal, opts) {
    if (signal == null || promise == null) {
        return promise;
    }
    const translateError = opts?.translateError ?? defaultTranslate;
    if (signal.aborted) {
        // the passed promise may yet resolve or reject but the use has signalled
        // they are no longer interested so smother the error
        promise.catch(() => { });
        return Promise.reject(translateError(signal));
    }
    let listener;
    return Promise.race([
        promise,
        new Promise((resolve, reject) => {
            listener = () => {
                reject(translateError(signal));
            };
            signal.addEventListener('abort', listener);
        })
    ])
        .finally(() => {
        if (listener != null) {
            signal.removeEventListener('abort', listener);
        }
    });
}
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