abort-utils/dist/link-controllers.js

Utility functions to use and combine `AbortSignal` and `AbortController` with Promises

function getSignal(controller) {
    return controller instanceof AbortController ? controller.signal : controller;
}
/**
 * Link multiple controllers so that when one aborts, they all abort with the same reason.
 * @param controllers The controllers to link.
 */
export function linkControllers(...controllers) {
    const alreadyAborted = controllers.find(controller => getSignal(controller).aborted);
    const onAbort = ({ target }) => {
        for (const controller of controllers) {
            if (controller instanceof AbortController) {
                controller.abort(target instanceof AbortSignal ? target.reason : undefined);
            }
        }
    };
    for (const controller of controllers) {
        if (!alreadyAborted) {
            getSignal(controller).addEventListener('abort', onAbort, { once: true });
        }
        else if (controller instanceof AbortController) {
            controller.abort(getSignal(alreadyAborted).reason);
        }
    }
}