@lifaon/rx-js-light/src/observable/pipes/built-in/with-notifications/others/notifications-to-values/derived/notifications-to-last-value/notifications-to-last-value-observable.mjs

Blazing fast Observables

import {asyncUnsubscribe} from "../../../../../../../../misc/helpers/async-unsubscribe.mjs";
export function notificationsToLastValueObservable(subscribe, onError) {
  return emit => {
    let running = true;
    const clear = () => {
      if (running) {
        running = false;
        asyncUnsubscribe(() => unsubscribe);
      }
    };
    let lastValue;
    const unsubscribe = subscribe(notification => {
      switch (notification.name) {
        case 'next':
          lastValue = notification.value;
          break;
        case 'complete':
          emit(lastValue);
          clear();
          break;
        case 'error':
          if (onError !== void 0) {
            onError(notification.value, value => {
              if (running) {
                emit(value);
              }
            });
          }
          break;
      }
    });
    return clear;
  };
}