@lifaon/rx-js-light/src/misc/abortable/create-abort-controler-from-abort-signals/create-abort-controler-from-abort-signals.mjs

Blazing fast Observables

import {isAbortSignal} from "../is/is-abort-signal.mjs";
import {createEventListener} from "../../event-listener/__old/create-event-listener.mjs";
export function createAbortControllerFromAbortSignals(signals) {
  const abortController = new AbortController();
  for (let i = 0, l = signals.length; i < l; i++) {
    const signal = signals[i];
    if (isAbortSignal(signal)) {
      if (signal.aborted) {
        abortController.abort();
        return abortController;
      }
    } else {
      throw new TypeError(`Expected AbortSignal at index #${i}`);
    }
  }
  const clear = () => {
    for (let i = 0, l = unsubscribeSignalList.length; i < l; i++) {
      unsubscribeSignalList[i]();
    }
    unsubscribeOwnSignal();
  };
  const unsubscribeOwnSignal = createEventListener(abortController.signal, 'abort', clear);
  const unsubscribeSignalList = signals.map(signal => {
    return createEventListener(signal, 'abort', () => {
      clear();
      abortController.abort();
    });
  });
  return abortController;
}