abort-controller-x-rxjs/es/defer.js

Abortable helpers for RxJS

import { EMPTY, from, Observable } from 'rxjs';
/**
 * Like original `defer` from RxJS, but aborts passed function when
 * unsubscribed.
 */
export function defer(observableFactory) {
    return new Observable(subscriber => {
        const abortController = new AbortController();
        let input;
        try {
            input = observableFactory(abortController.signal);
        }
        catch (err) {
            subscriber.error(err);
            return () => {
                abortController.abort();
            };
        }
        const source = input
            ? from(input)
            : EMPTY;
        return source.subscribe(subscriber).add(() => {
            abortController.abort();
        });
    });
}
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