firstValueFrom.js•784 B
import { EmptyError } from './util/EmptyError';
import { SafeSubscriber } from './Subscriber';
export function firstValueFrom(source, config) {
var hasConfig = typeof config === 'object';
return new Promise(function (resolve, reject) {
var subscriber = new SafeSubscriber({
next: function (value) {
resolve(value);
subscriber.unsubscribe();
},
error: reject,
complete: function () {
if (hasConfig) {
resolve(config.defaultValue);
}
else {
reject(new EmptyError());
}
},
});
source.subscribe(subscriber);
});
}
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