@lifaon/rx-js-light/src/observable/pipes/built-in/with-notifications/then/then-observable.mjs

Blazing fast Observables

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