race-cancellation/dist/withCancelPending.js

Utilities for using Promise.race([task, cancellation]) for async/await code.

import composeRaceCancel from "./composeRaceCancel.js";
import deferCancel from "./deferCancel.js";
/**
 * Wrap a {@link CancellableAsyncFn} function to cancel still pending concurrent child {@link CancellableAsyncFn}
 * functions when another concurrent promise either rejected in a Promise.all() or won in a Promise.race().
 *
 * @param cancellableAsync - a {@link CancellableAsyncFn} function to run with cancel pending
 * @param outerRaceCancel - an optional outer {@link RaceCancelFn} function
 * @public
 */
export default async function withCancelPending(cancellableAsync, outerRaceCancel) {
    const [raceSettled, settled] = deferCancel();
    let result;
    try {
        result = await cancellableAsync(composeRaceCancel(raceSettled, outerRaceCancel));
    }
    finally {
        settled("The operation was cancelled because it was still pending when another concurrent promise either rejected in a Promise.all() or won in a Promise.race().");
    }
    return result;
}
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