import CanceledError from "../cancel/CanceledError.mjs";
import AxiosError from "../core/AxiosError.mjs";
import utils from "../utils.mjs";
const composeSignals = (signals, timeout) => {
  const { length } = signals = signals ? signals.filter(Boolean) : [];
  if (timeout || length) {
    let controller = new AbortController();
    let aborted;
    const onabort = function(reason) {
      if (!aborted) {
        aborted = true;
        unsubscribe();
        const err = reason instanceof Error ? reason : this.reason;
        controller.abort(err instanceof AxiosError ? err : new CanceledError(err instanceof Error ? err.message : err));
      }
    };
    let timer = timeout && setTimeout(() => {
      timer = null;
      onabort(new AxiosError(`timeout ${timeout} of ms exceeded`, AxiosError.ETIMEDOUT));
    }, timeout);
    const unsubscribe = () => {
      if (signals) {
        timer && clearTimeout(timer);
        timer = null;
        signals.forEach((signal2) => {
          signal2.unsubscribe ? signal2.unsubscribe(onabort) : signal2.removeEventListener("abort", onabort);
        });
        signals = null;
      }
    };
    signals.forEach((signal2) => signal2.addEventListener("abort", onabort));
    const { signal } = controller;
    signal.unsubscribe = () => utils.asap(unsubscribe);
    return signal;
  }
};
export {
  composeSignals as default
};
