Function handler

packages/core/src/app/createApp/runSignals.ts:89–99

()

  if (addSignalHandler !== null) {
    for (const signal of options.signals ?? DEFAULT_SIGNALS) {
      const handler = () => {
        if (settled) return;
        settled = true;
        detach();
        void Promise.resolve()
          .then(() => options.onSignal())
          .catch(() => undefined)
          .finally(() => {
            resolvePromise();
          });
      };
      listeners.push(Object.freeze({ signal, handler }));
      addSignalHandler(signal, handler);
    }