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

Abortable helpers for RxJS

import { execute } from 'abort-controller-x';
import { EmptyError } from 'rxjs';
/**
 * Like original `lastValueFrom` from RxJS, but accepts `AbortSignal`. When that
 * signal is aborted, unsubscribes from the observable and throws `AbortError`.
 */
export function lastValueFrom(signal, source, config) {
    const hasConfig = typeof config === 'object';
    return execute(signal, (resolve, reject) => {
        let _hasValue = false;
        let _value;
        const subscription = source.subscribe({
            next: value => {
                _value = value;
                _hasValue = true;
            },
            error: reject,
            complete: () => {
                if (_hasValue) {
                    resolve(_value);
                }
                else if (hasConfig) {
                    resolve(config.defaultValue);
                }
                else {
                    reject(new EmptyError());
                }
            },
        });
        return () => {
            subscription.unsubscribe();
        };
    });
}
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