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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