rxjs/dist/esm/internal/firstValueFrom.js

Reactive Extensions for modern JavaScript

import { EmptyError } from './util/EmptyError';
import { SafeSubscriber } from './Subscriber';
export function firstValueFrom(source, config) {
    const hasConfig = typeof config === 'object';
    return new Promise((resolve, reject) => {
        const subscriber = new SafeSubscriber({
            next: (value) => {
                resolve(value);
                subscriber.unsubscribe();
            },
            error: reject,
            complete: () => {
                if (hasConfig) {
                    resolve(config.defaultValue);
                }
                else {
                    reject(new EmptyError());
                }
            },
        });
        source.subscribe(subscriber);
    });
}
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