race-cancellation/dist/deferCancel.js

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

import newRaceCancel from "./newRaceCancel.js";
/**
 * Create a tuple of {@link RaceCancelFn} and {@link ResolveCancelFn} functions.
 *
 * @remarks
 * In general, it is better to use {@link race-cancellation#withCancel} to scope cancellation
 * to an async task so that the cancellation concern is cleaned up.
 *
 * If the cancellation concern will be GC'ed with the cancel already and no cleanup
 * needed like removing an event listener than this method can be simpler.
 * @public
 */
export default function deferCancel() {
    let cancelled = false;
    let onCancel;
    let cancelReason;
    const raceCancel = newRaceCancel(() => cancelled, (cancel) => (onCancel = cancel), () => cancelReason);
    const cancel = (reason) => {
        cancelled = true;
        cancelReason = reason;
        if (onCancel !== undefined)
            onCancel();
    };
    return [raceCancel, cancel];
}
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